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121. 题目: Petrogenic Organic Carbon Weathering and a Geological Carbon Budget in the Yangtze River Basin
文章编号: N26050608
期刊: Global Biogeochemical Cycles
作者: Ye Wang, Yang Chen, Haoxian Wang, Shilei Li, David William Hedding, Pengxiao Xu, Xuming Li, Jun Chen
更新时间: 2026-05-06
摘要: As a crucial component of the geological carbon cycle, the weathering process of petrogenic organic carbon (OC petro ) remains poorly constrained on a continental scale, largely due to interference from anthropogenic activities. This uncertainty introduces substantial biases into assessments of the geological carbon budget. To address this, we analyzed major ions and rhenium (Re) concentrations in water samples from the Yangtze River Basin, employing a Monte‐Carlo inversion model to eliminate anthropogenic signals and quantify natural weathering flux. Our results indicate that anthropogenic inputs contribute over 50% of the total dissolved Re flux in the Yangtze River. After correcting for these anthropogenic perturbations, we derived a high‐temporal‐resolution record of OC petro weathering rates for the basin, with an annual average of 2.14 tC km −2 yr −1 . The associated CO 2 release from OC petro weathering is comparable in magnitude to the CO 2 drawdown from silicate weathering, implying that OC petro weathering constitutes a non‐negligible component of the net geological carbon budget of the Yangtze River Basin, China.

122. 题目: Glycine-mediated microbial interactions in biological phosphorus removal systems
文章编号: N26050607
期刊: Water Research
作者: Agustina Ziliani, Patricia Bovio-Winkler, Martin Pabst, Angela Cabezas, Claudia Etchebehere, Hector A Garcia, Carlos M López-Vázquez, Damir Brdjanovic, Mark C M van Loosdrecht, Francisco J Rubio-Rincón
更新时间: 2026-05-06
摘要: Amino acids are less-studied substrates in enhanced biological phosphorus removal (EBPR) systems. Glycine, a prevalent amino acid in wastewater, was used in this study to evaluate its role in EBPR processes. We operated a sequencing batch reactor (SBR) for over three months with glycine as the sole carbon source to investigate phosphorus removal performance and microbial dynamics using chemical and molecular analyses. The reactor supported EBPR activity, with glycine enabling anaerobic phosphorus release followed by aerobic uptake. The dissolved organic carbon to phosphorus (DOC:P) removal ratio of 100:9.9 closely matched values reported for systems dominated by polyphosphate-accumulating organisms (PAOs), and net phosphorus removal (20 mg PO₄-P L^-1) falls within the range reported for laboratory-scale EBPR systems fed with mixed carbon sources. Community analyses showed enrichment of Saccharimonadales alongside putative PAOs, including Ca. Phosphoribacter and Ca. Propionivibrio. Genome-resolved analyses indicate distinct but complementary metabolic potentials, including glycine transformation and lactate-related pathways, suggesting distributed carbon processing within the community. Together, these findings expand the understanding of amino acid utilization in EBPR systems and identify potential metabolic linkages that influence phosphorus removal under glycine-fed conditions.

123. 题目: Microplastic contamination enhances benthic dissolved organic carbon fluxes and molecular transformations in sediments
文章编号: N26050606
期刊: Water Research
作者: Na Eun Choi, Haeseong Oh, Yun Kyung Lee, Jin Hur
更新时间: 2026-05-06
摘要: Microplastics (MPs) are pervasive in aquatic environments and ultimately accumulate in sediments, yet their role in regulating benthic carbon cycling remains poorly constrained, particularly with respect to dissolved organic matter (DOM) exchange across the sediment–water interface. In this study, we conducted 28-day laboratory sediment-column incubations under controlled oxic and hypoxic conditions to quantify MP-associated changes in DOM quantity and composition in porewater and overlying water. Polyethylene (PE; petroleum-based) and polylactic acid (PLA; bio-based) MPs were added at 5% (w/w) as a high-end (hotspot) loading scenario. MP contamination increased porewater dissolved organic carbon (DOC) concentrations by up to 27-fold relative to controls, resulting in 1.6–18-fold higher cumulative benthic DOC fluxes across the sediment–water interface. Optical and size-fraction analyses revealed polymer-specific shifts in exported DOM quality. PLA treatments were characterized by strong enrichment of low-molecular-weight neutral fractions, consistent with MP-associated DOM inputs, whereas PE treatments were associated with enhanced mobilization and redistribution of sediment-derived DOM. Molecular-level analyses further showed that MP-associated formulas accounted for up to one-third of all detected molecular features, despite MPs comprising only ∼5% of sediment mass. This disproportionate molecular representation suggests that MPs may influence DOM composition beyond their direct mass contribution. Oxygen availability further modulated these molecular patterns, with oxic conditions characterized by higher proportions of formulas classified as metabolically active within the operational reactivity–activity framework, whereas hypoxic conditions favored the accumulation of relatively inactive and more persistent molecular fractions. Overall, these results suggest that sediment-associated MPs may alter both the quantity and molecular characteristics of DOM exchange across the sediment–water interface, highlighting their potential role in modifying benthic carbon exchange processes in MP-impacted aquatic systems.

124. 题目: Aqueous carbonated coal fly ash enhancing soil organic matter stability with implications for carbon storage and soil amelioration
文章编号: N26050605
期刊: Journal of Cleaner Production
作者: Bin Liu, Xueling Gong, Chenyang Zhai, Jianguo Li, Yuqing Liu, Tingting Li, Hang Zhai
更新时间: 2026-05-06
摘要: Utilizing coal fly ash (CFA) for soil amelioration offers a dual benefit: waste management and agricultural improvement. Soil organic matter (SOM) could help prevent the release of inherent toxic substances from the CFA. However, SOM is inherently unstable and can be easily degraded by microbes without protection. To address this, CFA was activated via aqueous carbonation to enhance the interaction between CFA and SOM. The carbonation formed a cation-rich layer on CFA surface, increasing the specific surface area and positive charge. These changes in CFA surface properties strengthened the binding between humic acid (HA, as a representative of SOM) and carbonated CFA (C-CFA), significantly reducing carbon loss caused by microbial degradation and water erosion. Furthermore, HA + C-CFA complexes were applied as soil ameliorators. Leaching experiments demonstrated that cadmium (Cd, used as a representative toxic substance) was immobilized in the following order: CFA < C-CFA < HA < HA + CFA < HA + C-CFA-5 (weakly carbonated) < HA + C-CFA-60 (highly carbonated). Additionally, phosphorus (P) bioavailability improved with HA + C-CFA treatments. These results indicate a synergistic effect between CFA carbonation and HA complexation, reducing heavy metal toxicity and enhancing fertilizer use efficiency. Additionally, pot experiments revealed that HA + C-CFA complexes significantly inhibited Cd accumulation in Chinese cabbage (Brassica campestris L.) while promoting plant growth in contaminated soils. These systematic studies, from revealing the molecular mechanisms underlying the enhanced binding between HA and C-CFA to applying HA + C-CFA complexes in plant cultivation, highlight the critical role of C-CFA in carbon storage and offer important implications for soil amelioration.

125. 题目: Dominant pore filling driven oxytetracycline removal by ZnCl2-activated biochar: Synergistic role of carbon defects and surface chemistry
文章编号: N26050604
期刊: Separation and Purification Technology
作者: Jie Ren, Ruosong Jing, Junwei Xin, Xudong Wang, Yongtao Lv, Licheng Chen, Huihui Zhang, Danxi Huang, Lei Wang
更新时间: 2026-05-06
摘要: Through targeted pore structure regulation via ZnCl₂ activation, a modified biochar (Zn-BC) with a high specific surface area and abundant microporous structure (enriched in 0.9–2.0 nm pores), dimensionally compatible with oxytetracycline (OTC), was synthesized for efficient OTC removal. Zn-BC achieved a maximum capacity of 896.61 mg/g at 303 K with equilibrium attained within 30 min. Kinetic and isotherm analyses (pseudo-second-order and Sips models) indicated a synergistic physicochemical process. Crucially, pore filling dominates the adsorption mechanism, as evidenced by the strongest linear correlation between micropore volume and adsorption capacity (R² = 0.999) and a marked decrease in micropore volume after adsorption. Spectroscopic characterization and DFT calculations further revealed that π-π stacking, hydrogen bonding, and π-π electron donor-acceptor (EDA) interactions serve as cooperative anchoring forces. Notably, engineered carbon defects provide the strongest chemical affinity via intense EDA effects, surpassing the contribution of oxygen-functional groups. Electrostatic and hydrophobic interactions played auxiliary roles. Zn-BC demonstrated robust stability across varying pH and real water matrices, with excellent regenerability over five cycles. This study elucidates the synergy between tailored pore architecture and surface chemistry, offering a vital reference for the targeted design of carbon-based environmental materials.

126. 题目: Nitrogen Release From Permafrost Thaw May Partially Offset Future Soil Carbon Losses
文章编号: N26050603
期刊: Global Change Biology
作者: Rémi Gaillard, Patricia Cadule, Philippe Peylin, Bertrand Guenet
更新时间: 2026-05-06
摘要: Permafrost ecosystems contain significant soil carbon stocks which could be partially decomposed and released into the atmosphere if permafrost thaws. However, their future response to climate change is uncertain due to the complex interactions between permafrost physics, hydrology, and the carbon and nitrogen cycles. In particular, the release of nitrogen from thawing permafrost is an overlooked feedback that could reduce the vegetation nitrogen limitation and enhance plant carbon uptake, affecting the future greenhouse gas balance in the Arctic. In this study, we use a new version of the Institut Pierre-Simon Laplace (IPSL) Earth system model, called IPSL-Perm-LandN, which includes an explicit representation of the nitrogen cycle and key permafrost physical and biogeochemical processes (e.g., soil freezing, insulation by soil organic matter, cryoturbation, vertically resolved soil biogeochemistry). We performed idealised climate change simulations to isolate the impacts of CO₂ fertilisation, climate change, and of increased nitrogen availability following permafrost thaw. In our model, this nitrogen-induced feedback offsets over 80% of the climate-induced permafrost soil carbon losses. It prevents an additional negative contribution of more than 10 PgC °C⁻¹ to the global carbon-climate feedback parameter $\gamma$ from permafrost ecosystems. Consequently, the permafrost region remains a carbon sink throughout the simulation, driven by the combined effects of CO₂ fertilisation and increased nitrogen availability following thaw. However, the future vegetation carbon uptake due to increased nitrogen availability has only been quantified in a few studies and may be overestimated by our model. Therefore, its strength remains highly uncertain and care must be taken not to underestimate the permafrost carbon-climate feedback when designing climate change mitigation strategies.

127. 题目: Elevated CO₂ Increases Cadmium Bioavailability in Paddy Soils via Soil Acidification and DOM Transformation
文章编号: N26050602
期刊: Water, Air, & Soil Pollution
作者: Hongyan Yu, Zuyu An, Xulei Geng, Yunlong Han, Jinyan Lan, Yanxun Qiu, Xuejia Bai, Xingchen Hao, Yue Teng
更新时间: 2026-05-06
摘要: Atmospheric CO₂ concentration is rising at an unprecedented rate, posing a multifaceted challenge to global agricultural ecosystems and food security. This short-term pot study, using two rice cultivars grown in soils with three cadmium (Cd) levels under ambient and elevated CO₂ conditions, demonstrated how elevated CO₂ (eCO₂, 620 ppm) influenced Cd bioavailability in paddy soils. The results showed that eCO₂ enhanced rice biomass by up to 27.05%, increased soil dissolved organic carbon (DOC) concentrations by 8.54%–20.51%, and induced soil acidification. Spectral analyses revealed that eCO₂ shifted dissolved organic matter (DOM) composition toward greater aromaticity and humification. These changes were closely associated with Cd mobilization: eCO₂ significantly elevated the concentrations of diethylenetriaminepentaacetic acid-extractable cadmium (DTPA-Cd) by 13.49%–23.91% and increased DOM-complexed Cd, leading to a 4.44%–23.84% increase in root Cd accumulation. Strong positive correlations between DOM aromaticity indices and total Cd or Cd fraction content, together with a significant negative correlation between soil pH and total Cd or Cd fraction content, indicated that the joint effects of soil acidification and modified DOM characteristics were important drivers of enhanced Cd mobility and bioavailability under eCO₂. These findings highlight an increased risk of Cd uptake by rice under future climate conditions.

128. 题目: Microcosm experiments reveal source‐specific impacts of atmospheric aerosols on plankton communities and organic matter in the sea surface microlayer
文章编号: N26050601
期刊: Limnology and Oceanography
作者: Andrea Milinković, Abra Penezić, Ana Cvitešić Kušan, Saranda Bakija Alempijević, Silva Žužul, Sanda Skejić, Danijela Šantić, Ranka Godec, Jelena Godrijan, Blaženka Gašparović, Maren Striebel, Jutta Niggemann, Mariana Ribas‐Ribas, Oliver Wurl, Sanja Frka
更新时间: 2026-05-06
摘要: The impact of atmospheric deposition on marine ecosystems requires consideration of the interfacial processes within the sea surface microlayer, the uppermost layer at the air–sea interface. This study examines the impact of anthropogenic and biomass burning aerosol particles on the plankton community structure and organic matter accumulation in the system derived from in situ‐collected microlayer compared to the underlying water through a 4‐day microcosm experiment conducted in August 2020 in the Central Adriatic area. Realistic aerosol additions (1 mg L −1 ) had different impacts on surface layers, revealing complex interactions between nutrient availability, toxicity, and plankton competition. A sudden nutrient supply, particularly of nitrogen, favored larger phytoplankton, while other aerosol constituents, such as trace metals and carbonaceous compounds, likely had a toxic effect, particularly on smaller species. The neuston in the microlayer showed greater sensitivity to pollutants, possibly due to higher UV exposure enhancing toxicity compared to the underlying water counterparts. Shifts in neuston diversity promoted the accumulation of organic carbon and surfactants in the microlayer, with potential implications for suppressing the air–sea CO 2 exchange.

129. 题目: Particulate organic carbon dominates early-stage soil carbon accumulation in restored mangroves across estuarine zones.
文章编号: N26050508
期刊: Journal of Environmental Management
作者: Leiyu Wang, Dalong Jiang, Zuo Xu, Tao Nie, Meiling Hong
更新时间: 2026-05-05
摘要: Mangrove ecosystems are globally important blue carbon reservoirs, yet the processes controlling soil organic carbon (SOC) stabilization during restoration remain insufficiently understood. This study investigated how estuarine setting, restoration strategies, and soil depth regulate particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) and their contributions to SOC in Qinglan Harbor, southern China. Compared with far-estuary sites, near-estuary sites presented higher POC and MAOC contents, with increases of 22.6% and 51.5%, respectively, whereas their relative contributions to SOC did not differ significantly. The restoration strategy significantly affected POC and SOC partitioning, with natural forests having higher POC contents than active and passive restoration sites did (234.6% and 213.8%, respectively), along with higher POC/SOC and lower MAOC/SOC ratios. Soil depth alone had no significant effect on SOC fractions, but its interaction with estuarine setting influenced POC distribution, with POC increasing with depth in the near-estuary but decreasing in the far-estuary. Vegetation structure, soil properties, and microbial diversity jointly regulated SOC fractions. POC increased with plant height and soil electrical conductivity but decreased with diameter at breast height and bacterial richness, whereas MAOC showed contrasting relationships with vegetation structure. Structural equation modeling indicated that both POC and MAOC were positively associated with SOC, with standardized path coefficients of 0.86 and 0.43, respectively. Environmental factors influenced SOC primarily through indirect pathways mediated by SOC fractions, whereas microbial diversity had a weak negative indirect effect. These results highlight the importance of SOC fractions in understanding carbon dynamics during mangrove restoration.

130. 题目: Effect of physical, chemical, and biological aging on activated carbon and biochar properties and PFAS immobilisation in soils
文章编号: N26050507
期刊: Journal of Hazardous Materials
作者: Shervin Kabiri, Karl C Bowles, Shrinath Bhat, Divina Angela Navarro
更新时间: 2026-05-05
摘要: An increasingly common technique for managing per- and polyfluoroalkyl substances (PFAS)–contaminated vadose soils is immobilisation using sorbents. However, uncertainty remains regarding the long-term stability of PFAS immobilisation. This study investigated the effects of different environmental aging processes, physical (wetting–drying cycles), chemical, and biological, on the performance of widely used sorbents for PFAS immobilisation in soil using accelerated aging to simulate long-term environmental conditions. Six sorbents were evaluated, including two granular activated carbons (GAC), two powdered activated carbons (PAC), colloidal activated carbon (CAC), and biochar. Simulated physical and biological aging caused the greatest reductions in sorption efficiency, likely due to pore blockage, as confirmed by material characterisation, including surface area measurement and scanning electron microscopic images. Sorbent type significantly influenced performance, with PAC being the least affected by aging and biochar the most susceptible. When soils and sorbents were aged together, sorbent responses differed between soil types, with sorption efficiency decreasing after chemical aging in sandy soil and after physical aging in high-clay soil compared with other aging treatments. Despite these deliberately harsh simulated conditions, activated carbon–based sorbents remained highly effective, maintaining over 85% PFAS immobilisation in most scenarios, including highly contaminated soils (∑PFAS > 20 mg/kg). Overall, these findings demonstrate that although aging alters sorbent properties, activated carbon–based sorbents remain durable and effective for sustainable PFAS management under diverse environmental conditions.

131. 题目: Fe-N co-modified lotus stalk biochar for TCH adsorption from aqueous solution: Performance, mechanism, machine learning modeling, and SHAP interpretation
文章编号: N26050506
期刊: Journal of Environmental Chemical Engineering
作者: Shuangsheng Zhang, Le Shen, Jing Qiang, Hanhu Liu, Jiaqing Xu, Jianqiang He, Jiayue Shi, Yiting Gao
更新时间: 2026-05-05
摘要: Metal loading and hetero-atom doping have become research hotspots in biochar (BC) modification. This study used lotus stalk to prepare Fe-N co-modified BC (FeN-BC) via one-step pyrolysis for efficient tetracycline hydrochloride (TCH) removal from aqueous solution. To improve the operability and accuracy of constructing a machine learning (ML) model linking adsorption parameters to capacity, constrained optimal Latin hypercube sampling with specified discrete steps was proposed for experimental design. Three ML models (random forest, support vector machine, and eXtreme Gradient Boosting (XGBoost)) were developed. SHapley Additive exPlanations (SHAP) quantified each feature factor’s contribution to adsorption and clarified key feature interactions. The results demonstrate that Fe-N synergy induced a hierarchically porous structure characterized by micropore preservation and mesopore creation, yielding a specific surface area of 752.06 m²·g^-1 and total pore volume of 0.7256 cm³·g^-1. This modification simultaneously introduced crystalline γ-Fe₂O₃/Fe₃O₄ and abundant defect sites (I_D/I_G = 1.43). The adsorption process was well-described by the pseudo-second-order kinetic model and the Langmuir isotherm model. Elevated temperature enhanced the adsorption, indicating a spontaneous and endothermic process dominated by chemical mechanisms. The adsorption mechanism involved pore filling, π-π interactions, hydrogen bonding, electrostatic attraction, and complexation. Among the ML models, XGBoost demonstrated superior performance. SHAP analysis identifies Ca²⁺ concentration, adsorption time, and pH as the dominant factors (80.34% cumulative contribution) and revealed the ternary antagonistic/synergistic mechanisms among Ca²⁺, pH, and time. This study provides theoretical foundations and guidance for the value-added utilization of lotus stalk, targeted modification of BC, and precise treatment of TCH in aqueous solution.

132. 题目: Efficacy Optimization of Biochar Filtration Electrode and Its Practical Application in Remediating Actual Heavy Metal-Contaminated Soil
文章编号: N26050505
期刊: Journal of Environmental Chemical Engineering
作者: Peng Zhang, Zhongjin Ding, Hantao Luo, Guoli Zhou, Zhaofeng Chang, Bo Pan
更新时间: 2026-05-05
摘要: Conventional leaching methods for remediating heavy metal (HM)-contaminated soils often incur high costs, cause substantial soil disturbance, and generate secondary wastewater. Integrating a biochar filtration electrode (BFE) with leaching technology presents a promising, sustainable approach for regenerating leaching agents and removing HMs. However, the influence of key BFE preparation parameters on remediation performance remains unclear, and validation in field-contaminated soils is limited. Here, we optimized rice straw–derived BFEs and evaluated their performance in real contaminated soils. The BFE prepared at 700 ℃ with a 0.7 mm biochar layer showed the best performance, owing to its large reactive surface area and rapid electron transfer. Using BFE700 (0.7 mm), removal efficiencies for Zn, Pb, and Cd from solution reached 97.53 ± 0.55%, 94.03 ± 0.90%, and 98.52 ± 0.06%, respectively. In HM-contaminated field soils, removal efficiencies of extractable Zn, Pb, and Cd all exceeded 84%, and the HMs were predominantly transformed to the residual fraction. Pea plants grown in the remediated soil showed growth comparable to those in unpolluted soil, and HM concentrations in the plants met safety standards. These results demonstrate that optimization of BFE preparation parameters markedly improves HM removal and supports the practical application of BFEs for remediation of actual HM-contaminated soils.

133. 题目: Application of rice husk biochar in foam lightweight filler: Investigating sustainable development potential of innovative subgrade materials
文章编号: N26050504
期刊: Journal of Environmental Chemical Engineering
作者: Erlu Wu, Pengfei Wei, Na Li, Ping Jiang, Wei Ding, Wei Wang
更新时间: 2026-05-05
摘要: Given that the resource utilization of solid waste is of importance to the sustainable development of the construction industry, the aim of this work was to prepare a new environmentally friendly lightweight roadbed filler (LRF) by adopting cement and solid wastes, including expanded polystyrene (EPS), iron tailing and biochar derived from waste rice husk (RHB). In this study, the strength characteristics of the LRF were investigated using unconfined compressive strength (UCS) and triaxial compression strength (TCS) tests, and its microstructural characteristics were revealed through scanning electron microscopy, thermogravimetric analysis, and mercury intrusion porosimetry. It has been captured that all stress-strain curves of LRF tend to be soften with a peak value under uniaxial and triaxial loading. The addition of RHB can effectively improve the strength properties of LRF, in which both UCS and TCS exhibit a tendency of increasing first and then decreasing with RHB content increasing, and both of them reach the peak value while RHB content is 30%. Compared with the control group, the addition of 30% RHB leads to 252%, 84% and 13% increasing in UCS, cohesion and internal friction angle respectively. The volcanic ash reactivity of RHB causes more hydration products generated, and RHB also has the filling effect, which both enhance the densification of the internal structure. It is believed that the finds are interesting in this study, which are essential for the practical application of LRF in road engineering.

134. 题目: Biochar Derived from Shell Waste: Adsorption of Phosphorus from Aqueous Solutions and Potential Application as Slow-Release Fertilizer
文章编号: N26050503
期刊: Journal of Environmental Chemical Engineering
作者: Shanshan Zhu, Yuting Lu, Tao Li, Yine Li, Pengfei Liu, Jiangfeng Teng, Chao Huang, Yuxin Jiang, Ping Wang
更新时间: 2026-05-05
摘要: The utilization of waste biomass to develop green and efficient phosphorus adsorbents is of significant importance for the recycling of phosphorus in eutrophic water bodies. In this study, a novel shell-modified rice straw biochar (SRSB) was fabricated via a facile one-step pyrolysis of invasive Pomacea canaliculata shells and rice straw. Systematic optimization of the feedstock mass ratio yielded a composite with significantly enhanced phosphate adsorption capacity. The research results indicated that when the mass ratio of Pomacea canaliculata shells to rice straw was 3:1 and the mixture was pyrolyzed at 800°C (labeled as SRSB3:1), the biochar exhibited excellent phosphorus adsorption performance over a broad pH range, with a maximum phosphorus adsorption capacity of 251.87 mg/g. The thermodynamic and kinetic studies revealed that the adsorption of phosphorus by SRSB3:1 was a spontaneous monolayer chemical adsorption process. Moreover, characterization suggested that SRSB3:1 reacted with phosphorus through a Ca-P chemical reaction, forming Ca₅(PO₄)₃OH. Additionally, seed germination and plant pot experiments demonstrated that phosphorus-saturated SRSB3:1 (labeled as SRSB3:1-P) effectively promoted seed germination and growth. This study presents a triple-win strategy for the harmless utilization of invasive species, efficient phosphorus recovery from wastewater, and the production of value-added biochar-based fertilizers, contributing to sustainable waste valorization and eutrophication mitigation.

135. 题目: Coupling adsorption with photocatalysis in biochar: the critical roles of pyrolysis temperature and inherent minerals in tetracycline removal
文章编号: N26050502
期刊: Journal of Environmental Chemical Engineering
作者: Manquan Zhao, Jinya Li, Tang Luo, Jiajia Luo, Weicheng Li, Shisuo Fan
更新时间: 2026-05-05
摘要: Biochar shows potential for mitigating antibiotic contamination in aquatic systems, but the synergy between adsorption and photocatalysis remains unclear due to structural complexity from both carbonaceous and mineral components. This study systematically examines how pyrolysis temperature and acid washing sequence (pre- vs. post-HCl treatment) affect the properties and tetracycline (TC) removal efficiency of rice straw-derived biochar. Pyrolysis temperature controls carbon structure and removal pathways: Low-temperature biochar, rich in oxygen-containing groups and dissolved organics, favored photocatalytic removal, whereas high-temperature biochar exhibited stronger adsorption-photocatalysis synergy. Acid washing significantly altered the mineral composition and surface charge of RSBC700, thereby reducing TC removal efficiency. Mechanistic analyses revealed that alkaline earth metals (e.g., Ca²⁺, Mg²⁺) in RSBC700 formed complexation sites with TC and promoted electron–hole separation, while aromatic C=C domains drove adsorption via π–π and electron-donor–acceptor interactions. Two-dimensional correlation FTIR spectroscopy further identified the sequence of TC interaction: aromatic C=C responded first, followed by coordination and hydrogen bonding involving –COOH, –OH, and C=O groups. Acid demineralization lowered the pHpzc, causing electrostatic repulsion between biochar and TC and impairing mineral-mediated reactive oxygen pathways. DFT calculations confirmed that mineral removal weakened biochar–TC binding. This work underscores the critical role of inherent minerals in adsorption–photocatalysis synergy and identifies surface charge as a key regulator of pollutant–interface behavior, offering a theoretical foundation for designing high-performance biochar-based functional materials.

136. 题目: Soil pH Amelioration Fosters Persistent Carbon Sinks Through Mineral Stabilization and Aggregate Protection
文章编号: N26050501
期刊: Global Change Biology
作者: Xunzhuo Dong, Bingbing Han, Yunyao Zhong, Benyi Li, Mengfei Li, Yuyang Qi, Zhaolei Li
更新时间: 2026-05-05
摘要: The stability of soil organic carbon (SOC) is fundamental to the integrity of agricultural carbon credits but remains challenging to verify and predict. A persistent methodological challenge lies in isolating the specific effect of soil pH amelioration from confounding factors like organic matter inputs. Here, by applying bivariate linear mixed-effects modelling to a global synthesis of 180 field trials, we quantitatively disentangled the effects of pH amelioration on SOC components across a stability continuum from bulk soils to aggregate fractions. The results showed that pH amelioration enhanced bulk SOC stocks by 18%–20%, with mineral-associated organic carbon and microbial necromass carbon significantly increasing by 11%–15% and 12%–19%, respectively. Simultaneously, pH amelioration restructured soil architecture toward enhanced aggregate stability, preferentially enriching carbon within microaggregates (by up to 44% in alkaline soils). Structural equation modelling confirmed that this process is hierarchically driven by pH-induced shifts in microbial biomass and aggregate stability. The pH amelioration-shared increment in particulate organic carbon and mineral-associated organic carbon tended to attenuate with prolonged experimental duration, while that in microbial necromass carbon remained invariant. Across organic substitution types, pH amelioration under manure substitution significantly increased all carbon components, while straw substitution exhibited a weaker pH amelioration-shared effect on particulate organic carbon increment compared to biochar and manure. Our findings suggest that pH amelioration is a fundamental process that engineers persistent carbon sinks by directing carbon flow into mineral-stabilized and physically protected pools. This work repositions precision pH management as an essential ecological engineering strategy and provides a mechanistic foundation for transitioning carbon credit protocols from stock-based accounting to stability-centric verification.

137. 题目: Enabling Direct Engineering of Porous Biochar with Machine Learning Using Only Simple Feedstock Information for Efficient Adsorption of CO2
文章编号: N26050413
期刊: ACS Sustainable Chemistry & Engineering
作者: Chengkai Cao, Zejian Ai, Weijin Zhang, Jianan Li, Hao Zhan, Lijian Leng, Hailong Li
更新时间: 2026-05-04
摘要: Biochar, derived from biomass pyrolysis and activation, is a versatile porous carbon material with wide applications in CO₂ adsorption. However, existing studies have mainly focused either on engineering biochar porosity or on correlating biochar properties with CO₂ adsorption capacity (CO₂Ad-q_e), without integrating both physical and chemical descriptors into a unified predictive framework. To address this gap, a coupled machine learning (ML) approach was developed to predict and engineer biochar for CO₂ adsorption. A gradient boosting regression (GBR) model was constructed by using biomass composition, pyrolysis parameters, activation conditions, and adsorption conditions as input variables, which achieved excellent predictive performance with an R² of 0.99 and an RMSE of 0.15. Moreover, the model requires only biomass composition, without any requirements to produce and characterize the biochar, to efficiently screen feedstocks and identify optimal production conditions for engineering biochar with high CO₂Ad-q_e. Validations based on an extra unseen data set further confirmed the robustness of the model. After screening several hundred biomass samples reported in the literature, bean straw was identified as the most promising feedstock, with a predicted maximum CO₂Ad-q_e of 6.62 mmol/g. This work provides a data-driven and efficient strategy for designing high-performance biochar, contributing to the advancement of sustainable CO₂ capture technologies and related areas.

138. 题目: Sediment-modulated seafloor residence time controls efficient organic carbon burial in subduction zones.
文章编号: N26050412
期刊: Nature Communications
作者: Mengfan Chu, Kejian Liu, Zhirong Cai, Troy Rasbury, Martin Kölling, Matthias Zabel, Cecilia McHugh, Michael Strasser, Ken Ikehara, Rui Bao
更新时间: 2026-05-04
摘要: The subduction organic carbon (OC) flux is closely linked with seafloor sedimentation processes. In hadal trenches, sediment transport and resuspension caused by turbidity events provide rapid feedback of subducting carbon fate to seafloor sedimentation dynamics. Here we demonstrate that sediment sorting creates distinct OC burial patterns in the Japan Trench: Prolonged seafloor residence enables preferential removal of labile OC components and result in a refractory subsurface OC pool. Conversely, rapid sediment burial shortens seafloor residence time and promotes subsurface anaerobic OC degradation. We further suggest that these mechanisms result in at least 37.6% loss of the OC subduction flux in accretionary margins due to early diagenetic and thermal alteration processes, while erosive margins only loss 11% during subduction and preferentially transfer thermally stable OC into subduction zones. Our work bridges surficial depositional regimes and deep carbon transfer, highlighting the need to consider depositional settings when refining subduction zone carbon budgets.

139. 题目: Role of iron oxides in stabilization of soil organic carbon along vegetation distribution gradient in coastal wetland, Southeastern China.
文章编号: N26050411
期刊: Journal of Environmental Management
作者: Rui Zhang, Lijie Pu, Jiawei Tao, Jiayi Xie, Sihua Huang, Xiaoqing Wang, Ye Yuan, Rui Zhong, Jiahao Zhai, Lu Yumeng
更新时间: 2026-05-04
摘要: Iron (Fe) oxide-mediated carbon sequestration (i.e., the formation of iron-bound organic carbon, Fe-OC) is a vital mechanism for the stabilization of soil organic carbon (SOC) in coastal wetlands. However, the spatial dynamics and regulatory mechanisms of Fe-OC along sea-to-land vegetation gradient remain incompletely understood. This study systematically investigated the spatial distribution of soil Fe forms, Fe phases, and Fe-OC across a typical coastal sea-to-land vegetation sequence comprising tidal flats (TF), Spartina alterniflora (SA), mixed SA and Suaeda salsa (SA&SS), Suaeda salsa (SS), and Phragmites australis (PA). The results indicated a net accumulation of the total iron pool (including Fe_o, Fe_d, and Fe_p), and altered soil redox conditions along the gradient. The Fe-OC content in the 0-60 cm soil profile ranged from 0.17 to 0.51 g/kg. Specifically, the SA community showed the highest average Fe-OC content and fFeOC, followed by the PA community, which collectively accounted for 20%-30% of the SOC pool. In contrast, the unvegetated TF exhibited the lowest Fe-OC content and the lowest fFeOC (<15%). Vertically, Fe-OC enrichment was most pronounced in the 10-30 cm soil layer. Model analysis further confirmed that mineral-associated organic carbon (MAOC), belowground biomass (BGB), specific surface area (SSA), silt content, Fe_p, Fe_d, and the Fe(III)/Fe(II) ratio were the core positive predictors driving the spatial heterogeneity of Fe-OC. This study highlights that the coupling of vegetation characteristics, nutrient availability, and iron-mineral protection mechanisms regulates the formation of the coastal rusty sink, thereby providing a crucial scientific basis for enhancing blue carbon stability under climate change.

140. 题目: Trade-off analysis between soil organic carbon and maize yield under no-tillage: implication for sustainable cropland management.
文章编号: N26050410
期刊: Journal of Environmental Management
作者: Mei Liang, Yinghao Su, Hui Xu, Ruonan Li, Aizhen Liang, Yan Zhang, Chuang Li, Jinfeng Ma, Hua Zheng
更新时间: 2026-05-04
摘要: Long-term intensive tillage has reduced soil organic carbon (SOC) and threatened sustainable maize production in Northeast China. Yet how tillage regulates SOC-yield relationship across climatic gradients remains unclear, limiting climate-smart cropland management. Here, we combined field observations with the DSSAT model to simulate long-term effects of conventional tillage (CT) and no-tillage (NT) on SOC and maize yield (MY) across the maize belt of Jilin Province, and qualified SOC-MY synergy/trade-off along aridity gradients. NT consistently increased SOC region-wide and improve MY on average, but yield benefits showed clear climatic thresholds. Yield gains were concentrated in moderately dry environments with intermediate water-heat availability (aridity index, AI ≈ 0.28-0.40). In humid zones (AI > 0.67), NT still promoted SOC accumulation but often failed to sustain MY, indicating a shift from co-benefit to trade-off. The area exhibiting simultaneous SOC and MY increases expanded rapidly during early adoption, stabilized in years 5-20, and gradually decline thereafter. These results demonstrate that NT co-benefit depend jointly on climate suitability and adoption stage, providing transferable thresholds for climate-informed promotion of conservation agriculture in temperate maize system.