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Harnessing waste H2S for aromatic amines production over porous K2MoSX/SiO2 catalyst

Chemical Engineering Journal 2025年 511卷

作者： Huang, Rui Jiang, Weiping Zheng, Xiaohai Lei, Ganchang Wang, Shiping Liang, Shijing Shen, Lijuan Zhan, Yingying Jiang, Lilong National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University Fujian Fuzhou350002 China College of Environmental and Resource Sciences College of Carbon Neutral Modern Industry Fujian Key Laboratory of Pollution Control & Resource Reuse Fujian Normal University Fuzhou350007 China

The utilization of H2S from industrial by-products as a hydrogen source offers an alternative approach for converting nitroarenes compounds (Ph-NO2) into aromatic amine (Ph-NH2) while also mitigating this environmental pollutant. However, the progress of this technology has been hindered by the lack of cost-effective and efficient catalysts. Herein, we present a porous K2MoSx/SiO2 catalyst synthesized using low-cost and environmentally friendly proline as template. The optimized K2MoSx/SiO2-proline catalyst achieves an 84 % conversion of Ph-NO2 with high Ph-NH2 selectivity for 91 % in the catalytic reduction of Ph-NO2 with H2S. Additionally, the K2MoSx/SiO2-proline shows considerable catalytic activity for the reduction of various substituted nitroarenes, demonstrating its versatility and broad applicability. The in situ DRIFTS and DFT calculations indicate that the reaction favors the formation of the essential intermediate *Ph-NO through a single H-induced pathway before proceeding to hydrogenation to yield Ph-NH2. © 2025 Elsevier B.V.

关键词： Aromatization

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Response of soil organic carbon stocks and soil microbial biomass carbon to natural grassland conversion: A global meta-analysis

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Science of the Total Environment 2025年 965卷 178481页

作者： Cai, Yijun Yang, Yuwen Jiang, Jinlin Long, Tao Gu, Xueyuan Guo, Yang Li, Ming Xie, Yufeng Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China

Natural grasslands worldwide are increasingly being converted into other land-use types, such as cropland and forest, thereby impacting soil carbon cycles and stocks. Soil organic carbon (SOC) is essential for regulating soil properties and microbial communities, while microbial biomass carbon (MBC) is the most active fraction of the SOC pool, both of which play pivotal roles in the global carbon cycle. Here, we performed a meta-analysis on 623 and 85 individual observations from 85 peer-reviewed articles to quantitatively evaluate the effect of grassland conversion on SOCS and MBC. Overall, conversions significantly reduced SOCS and MBC by 10.11 % and 30.63 %, respectively. Notably, the impact varied by conversion type: converting grassland to forest, cropland, and plantation reduced SOCS by 7.69 %, 16.47 %, and 20.55 %, respectively. Meanwhile, converting grassland to cropland and abandoned land decreased MBC by 47.80 % and 38.74 %, respectively. Environmental factors such as mean annual temperature (MAT), mean annual precipitation (MAP), soil total nitrogen (TN), and soil carbon-to‑nitrogen ratio (C/N) influenced these changes. SOCS and MBC were positively correlated with MAT, soil C/N and TN. Specifically, when the C/N or TN of the converted soil exceeded 1.21 or 1.11 times that of the original grassland, SOCS would exhibit a trend of carbon sequestration. Our findings provide valuable insights for global soil carbon sequestration and land use management policies. © 2025

关键词： Carbon sequestration

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Synergistic oxidation and coagulation of raw water by novel Fe(II)/sulfite process: A comparative study with peroxydisulfate and peroxymonosulfate

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Journal of Hazardous Materials 2025年 493卷 138418页

作者： Lu, Jian Guo, Yuhao Pan, Minyuan Fu, Qi Zhou, Bin Zhang, Tianyang Peng, Zhu Shi, Jun He, Huan Zeng, Chao Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Latest findings demonstrate that the oxidative Fe(II)/sulfite (Fe(II)/S(IV)) process can rapidly generate iron particles, holding potential for coagulation while simultaneously removing emerging contaminants. Herein, we first report the synergistic oxidation-coagulation treatment of RW by Fe(II)/S(IV) process, and compare with traditional Fe-based coagulation (FeSO4, Fe2(SO4)3), Fe(II)/PDS and Fe(II)/PMS processes. Results revealed that the Fe(II)/S(IV) process outperformed traditional Fe-based coagulants, Fe(II)/PDS and Fe(II)/PMS in removing turbidity, UV254, and DOC. For emerging contaminants removal from RW, Fe(II)/PMS showed the highest efficiency, followed by Fe(II)/PDS, while Fe(II)/S(IV) was slightly less effective, it still demonstrated a significant improvement (40 %∼65 %) over traditional coagulation processes. Moreover, the Fe(II)/S(IV) process is the most effective in reducing DBPs formation (56 %∼86 %). Although Fe(II)/PDS and Fe(II)/PMS also significantly reduce DBPs formation, their high oxidation potential at low pH generated toxic N-DBPs. Mechanistic analysis indicated that the Fe(II)/S(IV) process was most effective in removing humic substances and biopolymers. Its moderate oxidation preserved macromolecular structures, enhancing coagulation. And the hydrolysis of S(IV) generates OH⁻, promoting electrostatic neutralization and floc enlargement. Cost analysis revealed that the Fe(II)/S(IV) process is significantly more economical, with costs only 1/60 of Fe(II)/PMS. These results highlight the Fe(II)/S(IV) process as a promising and cost-effective approach to advanced water treatment. © 2025 Elsevier B.V.

关键词： Coagulation

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Outstanding Self-Healing and Plasticity of Imine-Linked Dynamic Pdms with High Softness and Stability

SSRN

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SSRN 2025年

作者： Luo, Fubin Sun, Junyan Zou, Yingbing Yang, Xueyan Lin, Bili Feng, Yixing Li, Hongzhou Engineering Research Center of polymer Green Recycling of Ministry of Education College of Environmental and Resource Sciences Fujian Normal University Fuzhou350007 China Fujian Key Laboratory of Pollution Control & Resource Reuse College of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350007 China

The demand for soft and flexible polymers as thermal management materials for electronic devices is steadily rising. Polydimethylsiloxane (PDMS), commonly utilized for thermal management due to its remarkable flexibility. Herein, we report the synthesis of a novel imine-linked dynamic PDMS network with exceptional softness, characterized by a stretchability exceeding 2000% and a low Young's modulus of 92.3 kPa, via Schiff-base reaction. The network is achieved by the reaction of amino-terminated PDMS with aldehyde-containing crosslinking agents and chain extenders. The dynamic imine bond enables outstanding self-healing and plasticity of the cross-linked PDMS. The experimental results indicate that the synthesized PDMS is capable of adhering to metal substrates and, after disruption, can achieve multiple adhesions through rapid self-healing, while remaining a shearing strength of approximately 150 kPa. Simultaneously, it can be molded into thin film through rolling, exhibiting excellent plasticity. As thermal management materials matrix, the synthesis PDMS exhibits high initial decomposition temperature of 410oC, and without silicone extractables under 125oC for 48 hours. When used as a thermal interface material, this material demonstrates effective heat dissipation in operating electronic devices. © 2025, The Authors. All rights reserved.

关键词： Silicones

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Enhanced copper passivation in pig manure composting through iron nanoparticle amendment

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Science of the Total Environment 2025年 958卷 177950页

作者： Yang, Wenqing Zhong, Yuanping Zhuo, Qian Xiao, Liren Owens, Gary Chen, Zuliang Fujian Provincial Key Lab of Coastal Basin Environment Fujian Polytechnic Normal University Fujian Province Fuqing350300 China Fujian Key Laboratory of Pollution Control & Resource Reuse Fujian Province Fuzhou350007 China Environmental Contaminants Group Future Industries Institute University of South Australia Mawson Lakes Campus SA5095 Australia

As the world's leading producer of pigs, China is now experiencing large-scale pollution derived from agricultural usage of untreated pig manure, where passivation of metal toxicity in pig manure is a major challenge. Here, the effect of green synthesized iron nanoparticle (G-nFe) addition on copper (Cu) transformations during thermophilic aerobic composting of pig manure was investigated. The results revealed that following addition of G-nFe passivation of active Cu forms, including exchangeable (EXC-Cu), carbonate-bound (CAR[sbnd]Cu), and iron and manganese oxide-bound (IMO[sbnd]Cu) Cu increased by 66.8, 47.5, and 15.4 %, respectively. The fraction of Cu bound to organic matter (OM-Cu) also increased with composting and was influenced by G-nFe dose. Notably, addition of 500 mL kg−1 G-nFe increased OM-Cu to 52.9 %. Residual Cu (RES[sbnd]Cu) concentrations initially rose within the first five days of composting, followed by a subsequent decline, demonstrating that G-nFe addition had dual effects: firstly, an initial 31.3 % increase in RES-Cu five days post-G-nFe addition;and secondly, a subsequent 60.9 % reduction over the entire composting process. Furthermore, OM, Humus and Fourier transform infrared (FTIR) analysis confirmed that the increase in OM-Cu, coupled with G-nFe, facilitated the transformation of Cu into OM-Cu fractions post-composting. This work thus provides new insights into how iron nanomaterials can increase passivation of metal ions during composting. © 2024 Elsevier B.V.

关键词： Copper

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Destabilization of colloidal particles induced by in-situ calcium carbonate crystallization with implications on highly-efficient removal of insoluble matter from anaerobic digestate liquor

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Separation and Purification Technology 2025年 370卷

作者： Feng, Jieling Chai, Xiaoli Dai, Xiaohu Wu, Boran State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Efficient solid–liquid separation of anaerobic digestate liquor (ADL) is hindered by colloidal-sized suspended solids (SS), which negatively affect subsequent biological treatments. This study presented a novel approach in which in-situ crystal formation induced destabilization of colloidal particles in ADL, and the co-precipitation of insoluble organic matter with high-density crystal particles improved SS removal. Primarily, the optimal SS removal of 96.1 % was achieved with 1.0 wt% CaCl2 at an initial pH of 13. Destabilization of colloidal particles in ADL, supported by increased Turbiscan Stability Index (TSI), particle downward migration rates, and particle diameter, was monitored using a Turbiscan multiple light scattering analyzer. Mechanistic analysis revealed that the in-situ formed crystals primarily consisted of CaCO3, which formed from the added Ca2+ and inherent CO32– ions in ADL (the major background carbonate species at high pH). Precipitate porosity analysis revealed that CaCO3 efficiently adsorbed colloidal particles, which were then separated from ADL via co-precipitation. Furthermore, the interfacial free energy of adhesion of CaCO3 to colloidal particles was significantly higher than the self-cohesion energy of colloidal particles, suggesting a greater tendency for co-precipitation with CaCO3 rather than remaining dispersed. This interaction was the key mechanism for enhanced removal of insoluble matter from CaCl2-treated ADL. These findings suggest in-situ crystallization as an effective method for SS removal from ADL, reducing the biological load while maintaining alkalinity, which facilitates subsequent biological treatment represented by anaerobic ammonia oxidation (ANAMMOX). © 2025 Elsevier B.V.

关键词： Coprecipitation

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Organic micropollutant removal by two-dimensional material membranes: Influencing factor analysis and mechanistic insights

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Desalination 2025年 611卷

作者： Chen, Xinran Ren, Jing Wang, Zhiwei Tong, Xin State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security Tongji Advanced Membrane Technology Center School of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China

The innovation of two-dimensional (2D) materials offers a competitive alternative for designing state-of-the-art membranes with outstanding separation performances. When combined with structural tailoring approaches, 2D material membranes exhibit impressive selectivity towards ions and organic molecules, highlighting their tremendous potential in water treatment applications. This review systematically summarizes current structural tailoring methods and rejection performance of 2D material membranes for eliminating organic micropollutants (OMPs) from water matrices. We use correlation analysis to reveal the potential relationship between solute-membrane interactions and membrane performance, and the previously overlooked interfacial phenomena during transmembrane processes are emphasized and critically discussed. We also comprehensively analyze transmembrane mechanisms within 2D material membranes based on conventional mass transfer theories and representative transport models, such as the pore-flow model and the solution-diffusion model. While interfacial phenomena have been esteemed as critical factors influencing molecular transmembrane behaviors, significant knowledge gaps remain in fully elucidating these potential mechanisms. By emphasizing the importance of interfacial interactions, this review provides a mechanistic perspective for designing 2D material membranes with enhanced OMP removal, thereby supporting the future development and innovation of state-of-the-art 2D material membranes. © 2025 Elsevier B.V.

关键词： Nafion membranes

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Climate Downscaling Using Neural Operator: Spatiotemporal Multimodal Fusion Operator with State-Query Coupled Kernel

Climate Downscaling Using Neural Operator: Spatiotemporal Mu...

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2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025

作者： Zhang, Haodi Wang, Yichi Jian, Yifan Jiang, Jiahui Bai, Zhaohai Ma, Lin College of Computer Science and Software Engineering Shenzhen University China Center for Agricultural Resources Research Institute of Genetic and Developmental Biology Chinese Academy of Sciences China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University China

ISBN: (纸本)9798350368741

Climate downscaling is crucial for detailed small-scale analysis and for acquiring climate data in regions without weather stations. Operator learning has proven potential for this task. However, several challenges remain in operator learning, such as multimodal fusion, spatiotemporal fusion and input state and query adaptation. To address these challenges, we propose a Spatiotemporal Multimodal Fusion Operator with a State-Query Coupled Kernel (SMCK). This framework includes a latent space fusion encoder that encodes climate variables using position-wise multihead attention for multimodal fusion and integrates historical information to generate robust and precise representation. Additionally, we introduce a state-query coupled kernel that combines radial basis functions and discrete fourier encoding to enhance query location representation, while also adapting to the state to obtain the coupled kernel. Extensive experiments demonstrate that our method achieves state-ofthe-art performance and provides strong support for climate downscaling and the planning of climate-related strategies. © 2025 IEEE.

关键词： Climate downscaling Deep Learning Multimodal fusion Operator learning Time series forecasting

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Synergistic Catalysis for Recycling and Upcycling of Plastics

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ACS Catalysis 2025年第10期15卷 8551-8585页

作者： Ran, Hongshun Sun, Xinyang Zheng, Mengying Jing, Yaxuan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Institute for the Environment and Health Nanjing University Suzhou Campus Suzhou215163 China

The management of waste plastics is a critical challenge due to their chemical stability, high production volume, low economic value, and short lifespan. Currently, only a small fraction of plastic waste is mechanically recycled, while most are incinerated, landfilled, or released into the environment, exacerbating pollution. Given their potential as energy-rich carbon resources, chemical valorization has gained increasing attention. A key challenge in plastic chemical recycling lies in the selective activation and cleavage of C-C, C-O, C-N, and C-Cl bonds within polymeric macromolecules. The whole cleavage process involving substrate adsorption, H2/O2 dissociation, bond activation-cleavage, intermediate saturation and product desorption usually requires synergistic catalysis between two or more different active sites. Understanding these cooperative catalytic mechanisms is crucial for optimizing catalyst design and reaction pathways. It integrates insights from molecular-level catalysis, active site engineering, and mechanistic studies of tandem catalysis systems, providing a comprehensive understanding of reaction networks and pathways that enable precise bond activation and cleavage using multifunctional catalysts. © 2025 American Chemical Society.

关键词： Catalysis

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Fe/N modified porous carbon nanofibers with encapsulated FeCo nanoparticles for efficient electrocatalytic nitrate reduction to ammonia

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Journal of Environmental Sciences (China) 2025年 157卷 90-99页

作者： Chen, Jiayu Wu, Anni Li, Jixiang Hong, Chengyi Tang, Wenxiang Zheng, Hu Teng, Wei State Key Laboratory for of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Department of Geotechnical Engineering College of Civil Engineering Tongji University Shanghai 200092 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 200120 China University of Chinese Academy of Sciences Beijing 100049 China Department of Civil and Environmental Engineering Carnegie Mellon University PittsburghPA15213 United States Key Laboratory of Geotechnical and Underground Engineering of the ministry of Education State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

The efficient electrocatalytic nitrate (NO3−) reduction to ammonia (NRA) offers a sustainable alternative for both environmental remediation and ammonia synthesis. Developing advanced electrocatalysts with rationally designed spatial arrangement of active sites and optimizing the synergetic effect among components are crucial for high efficiency and selectivity. Herein, we present Fe/N active sites decorated on porous carbon nanofibers (CNFs) with encapsulated FeCo nanoparticles (FeCo@CNFs-Fe/N) as electrocatalysts for NRA. The FeCo@CNFs-Fe/N catalyst demonstrates exceptional performance, achieving a high ammonia yield of 498.18 μmol/(h·gcat). Meanwhile, the enhanced reduction activity, especially the reduction in overpotential by 0.565 V, is 3–10 times higher than that of FeCo-encapsulated and Fe/N-modified CNFs-based catalysts. The enhanced catalytic activity is attributed to the efficient structure design and optimized spatial distribution of active sites, which enhance the electron transfer rate and decrease the reaction energy barrier. Mechanistic studies reveal that the synergetic effect between encapsulated nanoparticles and surface-modified Fe/N sites plays a crucial role in promoting efficient nitrate adsorption and selective ammonia production. These findings highlight the potential of strategically engineered CNF-based composites for nitrate reduction and other advanced electrocatalytic applications. © 2025

关键词： Carbon nanofibers

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