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Enhanced copper passivation in pig manure composting through iron nanoparticle amendment

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

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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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Calcination Temperature Effect on Ceo2 Catalytic Activity for Soot Oxidation: A Combined Experimental and Theoretical Approach

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SSRN 2023年

作者： Hu, Chao Song, Yan Li, Jie Liu, Zinuo Ying, Yaru Chen, Zhenzhen Wan, Xiaokang Rong, Nai He, Jing Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse School of Environment and Energy Engineering Anhui Jianzhu University Hefei China Anhui Province Key Laboratory of Intelligent Building and Building Energy-saving Anhui Jianzhu University Hefei China

The catalytic efficiency of CeO2 catalysts in soot catalytic process is significantly influenced by their grain morphology and calcination temperature. Herein, nanocube-shaped and nanorod-shaped CeO2 catalysts were synthesized via the hydrothermal method with different calcination temperatures. Activity tests revealed that the nanorod-shaped CeO2 catalysts exhibited superior catalytic activity compared to the nanocube-shaped catalysts at equivalent calcination temperatures. Furthermore, within the nanorod-shaped CeO2 catalysts, an inverse relationship was observed between calcination temperature and catalytic activity, with the nanorod-shaped CeO2 catalyst calcined at 300 °C demonstrating the most effective low-temperature catalytic performance. Combined with characterizations and density functional theory calculations showed that the enhanced catalytic performance, in addition to its reduced grain size, can be attributed to an increase in oxygen vacancy abundance and enhanced lattice oxygen mobility, arising from its distinctive surface defect structure. This advantageous configuration facilitates the oxidative combustion of soot particles at lower temperatures, thereby enhancing the catalyst's reactivity under low-temperature conditions. © 2023, The Authors. All rights reserved.

关键词： Oxygen vacancies

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Surface catalytic degradation of ciprofloxacin by ferrihydrite sulfidation under ambient conditions

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Environmental pollution 2025年 371卷 125945页

作者： Chen, Xiru Bai, Lihua Li, Hongjian Wang, Xinhao Wang, Chao Fang, Yanfen Gu, Cheng State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Key Laboratory of Environmental Remediation and Ecological Health Ministry of Industry and Information·Technology Jiangsu Province Ecology and Environment Protection Engineering Research Center of Groundwater Pollution Prevention and Control Jiangsu Environmental Engineering Technology Co. Ltd. Nanjing210019 China College of Materials and Chemical Engineering China Three Gorges University Hubei Yichang443002 China

Dissolved sulfide (S(-II)) is abundant in sediments and capable of initiating the sulfidation reactions of iron-bearing minerals, in which the reaction mechanisms have been well documented. However, the impact of the S(-II)/Fe concentration ratio on reactive oxygen species (ROS) formation and the fate of co-existing contaminants upon iron-bearing minerals sulfidation under ambient conditions remains inadequately explored. Herein, the transformation of ciprofloxacin (CIP) by ferrihydrite sulfidation under ambient conditions was systematically investigated. Our findings indicated that the rate of CIP degradation initially increased with rising S(-II)/Fe concentration ratios, but subsequently decreased as the ratio continued to elevate. Evidence from electron paramagnetic resonance, molecular probing and quenching experiments revealed that the superoxide anion radical (O2•-), primarily produced from the reaction between O2 and surface-bound Fe(II), was the dominant contributor to the accelerated transformation of CIP. Upon being attacked by ROS, CIP underwent degradation via carboxyl substitution, defluorination, hydroxylation, piperazine ring ketonization and piperazine ring cleavage. Additionally, common water quality factors, i.e., pH, natural organic matter (NOM) and inorganic anions could also significantly influence the degradation processes of CIP during ferrihydrite sulfidation under ambient conditions. This research offers valuable insights into the significant function of mineral sulfidation in facilitating the formation and reactivity of ROS, which sheds light on enhanced elimination of organic contaminants in sediments. © 2025 Elsevier Ltd

关键词： Reactive oxygen species

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How Nitrate and Ammonium Impacting on Soil Organic Carbon Transformation Across Aggregate Size

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SSRN 2024年

作者： Su, Shixun Zhang, Zhenjun Lin, Jiajiang Owens, Gary Chen, Zuliang Fujian Key Laboratory of Pollution Control and Resource Reuse College of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350117 China Environmental Contaminants Group Future Industries Institute University of South Australia Mawson LakesSA5095 Australia Fujian Normal University China

While nitrogen (N) deposition and over-fertilization enrich N in soil, it is unclear how to impact on soil organic carbon (SOC) transformation at aggregate scales. Herein, a 90-day study reveals the mechanisms of nitrate and ammonium addition on the transformation of organic carbon in rice soil aggregates. Results showed that nitrate treatment (NT) and ammonium treatment (AT) significantly increased SOC content by 15.6% and 18.9%, respectively. In addition, NT increased SOC accrual in large macro-aggregates (LMA), while AT increased SOC accrual in small macro-aggregates (SMA) and micro-aggregates (MA). Further analysis of pyrolysis products showed that N enrichment drove the transformation of SOM composition into recalcitrant SOM, with polysaccharides declining from 19-30% to 2-13%, while lipids increased from 18-27% to 33-45%, LMA and SMA had more aromatic compounds than MA. This is related to the inhibition of the expression of C degradation function genes, metagenomic analysis showed that almost all genes encoding SOC degradation are down-regulated under N enrichment, while NT increased the abundance of genes encoding N-containing compounds degradation in LMA. Moreover, NO3- enrichment exerted a higher inhibitory effect on labile SOC degradation while NH4+ enrichment substantially inhibited recalcitrant SOC. Finally, Random Forest analysis confirmed that N enrichment increased the importance of N-containing compounds metabolism, which diminished when soil aggregates size decreased. In contrast, the importance of genes encoding saccharides and cellulose metabolism increased in smaller aggregates. This study highlights that both N type and aggregate size were determining factors in shaping SOC transformation in the N enrichment process. © 2024, The Authors. All rights reserved.

关键词： Organic carbon

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Enhancing Intracellular Antibiotic Resistance Genes Removal Via the Synergistic Effect of Hydroxyl Radicals and Singlet Oxygen in the Electrochemical Membrane-Naclo System

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SSRN 2025年

作者： Zhang, Bo Zhang, Yunxin Kong, Bo Wang, Zhiguo Li, Jizhen Lu, Jiajun Ma, Defang Wang, Yan Technology Center China Tobacco Hunan Industrial Co. Ltd. Changsha410007 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao China School of Environment Beijing Normal University China

Antibiotic resistance genes (ARGs) are frequently detected in a variety of aquatic environments and pose potential threats to public health and ecosystems. This study explored the removal of ARGs using two electrochemical membranes: CeO2-O@CNT membrane (prepared in air) and CeO2-Ar@CNT membrane (prepared in argon). Compared with the CeO2-O@CNT membrane, the CeO2-Ar@CNT membrane demonstrated a lower equivalent polarization resistance and a higher electrochemical reaction rate, leading to higher production of singlet oxygen (¹O₂) when integrated with NaClO. Owing to the synergistic effect of •OH and ¹O₂, the CeO2-Ar@CNT-NaClO system achieved enhanced removal of intracellular ARGs (sul1, tetA, intI1, and 16S rRNA) compared to the CeO2-O@CNT-NaClO system. The synergistic mechanism between •OH and ¹O₂ involves the initial damage to the cell membrane by •OH, which subsequently allows ¹O₂ to penetrate into the cells and directly oxidize the intracellular ARGs. Although the CeO2-O@CNT-NaClO system produced insufficient ¹O₂ for directly oxidizing intracellular ARG, it achieved comparable removal efficiencies for extracellular ARGs as the CeO2-Ar@CNT-NaClO system, driven by •OH. This study offers theoretical support for the optimization of electrochemical membranes with the aim of curbing the spread of antibiotic resistance. © 2025, The Authors. All rights reserved.

关键词： Antibiotics

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Biochar-supported nano-scale zerovalent iron activated persulfate for remediation of aromatic hydrocarbon-contaminated soil:an in-situ pilot-scale study

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Biochar 2022年第1期4卷 122-133页

作者： Yu Zeng Tai Li Yingzhi Ding Guodong Fang Xiaolei Wang Bo Ye Liqiang Ge Juan Gao Yujun Wang Dongmei Zhou Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China School of Environmental and Safety Engineering Changzhou UniversityChangzhou 213164China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001People’s Republic of China Geological Survey of Jiangsu Province Nanjing 210018People’s Republic of China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023People’s Republic of China

Biochar supported nano-scale zerovalent iron(nZVI/BC)for persulfate(PS)activation has been studied extensively for the degradation of pollutants on the lab scale,but it was rarely applied in practical soil remediation in the *** this research,we developed a facile ball-milling method for the mass production of nZVI/BC,which was successfully applied to activate persulfate for the remediation of organic polluted soil on an in-situ pilot ***-situ high-pressure injection device was developed to inject nZVI/BC suspension and PS solution into the soil with a depth of 0-70 *** removal efficiency of target pollutants such as 2-ethylnitrobenzene(ENB,1.47-1.56 mg/kg),biphenyl(BP,0.19-0.21 mg/kg),4-(methylsulfonyl)toluene(MST,0.32-0.43 mg/kg),and 4-phenylphenol(PP,1.70-2.46 mg/kg)at different soil depths was 99.7%,99.1%,99.9%and 99.7%,respectively,after 360 days of *** application of nZVI/BC significantly increased the degradation rates of contaminants by 11-322%,ascribed to its relatively higher efficiency of free radical generation than that of control *** addition,it was found that nZVI/BC-PS inhibited soil urease and sucrase enzyme activities by 1-61%within 55 days due to the oxidative stress for microbes induced by free radicals,while these inhibition effects disappeared with remediation time prolonged(>127 days).Our research provides a useful implementation case of remediation with nZVI/BC-PS activation and verifies its feasibility in practical contaminated soil remediation.

关键词： Persulfate Biochar Nanoscale zerovalent iron Pilot-scale Enzyme activities

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Diazotrophic community difference between specialists and generalists in response to arsenic and antimony contaminations

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Environmental Research 2025年 278卷

作者： Wang, Yan Xiong, Yiqun Li, Yongbin He, Liu Chen, Mingyue Fu, Rongbin Xiao, Yu Key Laboratory of Industrial Wastewater Treatment and Resource Utilization in Anhui Province East China Engineering Science & Technology Co. Ltd. Hefei230041 China School of Environmental Science and Technology Dalian University of Technology Dalian116024 China Center for Environmental Risk Management & Remediation of Soil & Groundwater State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China Environmental Remediation Co. Ltd. Hangzhou310016 China

Diazotrophs are pivotal in bioremediation, particularly in environments contaminated by metal(loid)s. Despite their significance, the specific impacts of such contamination on the diverse functional groups of soil diazotrophs, including both generalists and specialists, are not well understood. Our study examines the influences of antimony and arsenic contamination on the ecological functions of these diazotrophic groups in areas with high (HC) and low (LC) contamination. Utilizing geochemical analyses, nitrogenase gene (nifH) sequencing, and robust statistical approaches, we assessed the composition and distribution patterns of diazotrophs across different contamination levels. Our results show consistent alpha diversity among diazotrophic subcommunities in both HC and LC sites, highlighting their resilience to metal-induced stress. Generalists exhibited significant compositional shifts between HC and LC sites, whereas specialists remained stable. Network analyses revealed that specialists more frequently occupy central roles than generalists, yet metal stress displaces both groups from these positions within the networks. Deterministic processes were identified as the dominant factors influencing community assembly for both subcommunities. While MST values suggested a similar balance of deterministic and stochastic processes between HC and LC sites, the findings indicate that metal(loid) contamination may still contribute to ecological selection, particularly through Sb and As influencing generalist and specialist composition. These results provide valuable insights into the differential responses of generalist and specialist subcommunities to metal contamination, informing improved ecosystem management and bioremediation strategies. © 2025 Elsevier Inc.

关键词： Microorganisms

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Lanthanum-Doped Mesoporous Magnetic Carbon Microspheres Derived from Camellia Oleifera Shell Biomass for Phosphate Removal from Industrial Wastewater

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SSRN 2024年

作者： Guo, Huiqin Lin, Jun'e Zhao, Zimiao Kang, Huayue Guo, Yongliang Peng, Tianhui Li, Kexin Yan, Liushui Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong University Nanchang330063 China National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource utilization Nanchang Hangkong University Nanchang330063 China College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control Hunan University Changsha410082 China

Lanthanum-based adsorbents have garnered considerable attention due to their superior phosphate removal property and environmental harmlessness. This study introduces a facile hydrothermal technique for the fabrication of two lanthanum-doped mesoporous magnetic carbon microspheres variants, named MCMSs-LaEX and MCMSs-LaIN, derived from Camellia oleifera shells. These microspheres were synthesized by modifying carbon microspheres (CMSs) with La(OH)3 and Fe3O4 to enhance their phosphate adsorption efficiency in wastewater treatment. The adsorption kinetics and isotherms were fitted well to the pseudo-second-order model and Freundlich model, respectively, indicating a multilayer chemisorption mechanism. The materials exhibited excellent adsorption capacity across a wide pH range of 2-7 and notable selectivity for phosphate ions amidst the presence of high concentrations of common competitive anions in water. Moreover, the MCMSs-LaIN preserved an adsorption efficiency of 90% even after undergoing four cycles of adsorption and desorption with diluted NaOH solution, attesting to its durability and potential for reuse. In-depth XRD, FT-IR and XPS characterization results revealed that the adsorption process is primarily driven by ligand exchange between phosphates and La(OH)3. Importantly, both MCMSs-LaEX and MCMSs-LaIN displayed exceptional effectiveness in removing phosphate from complex industrial wastewaters, such as those generated in phosphating and electrophoresis operations, underscoring their practical applicability in environmental remediation. © 2024, The Authors. All rights reserved.

关键词： Lanthanum compounds

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Inhibitory Mechanism of Cr (Vi) or Fe (Iii) Complexation on the Photodegradation of Nitrogen-Doped Dissolved Black Carbon for Tetracycline: The Reducing Steady-State Concentration of 3ndbc* and 1o2

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SSRN 2023年

作者： Guo, Yong Chen, Mengxia Chen, Ting Guo, Ying You, Guoxiang Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing210093 China Key Laboratory of Environmental Engineering of Jiangsu Province Jiangsu Provincial Academy of Environmental Science Nanjing210036 China State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210023 China

Dissolved black carbon (DBC) is known for strong environmental mobility and photodegradation to contaminants. But studies on the impact of metal ions for nitrogen-doped DBC (NDBC) photodegradation of antibiotics are barely found. Herein, the photodegradation performance of tetracycline (TC) induced by NDBC involving Cr (VI) or Fe (III) was explored. Adding Cr (VI) or Fe (III) reduces the photodegradation performance of NDBC for TC. Detailedly, the photodegradation efficiency of NDBC for TC is 79%, which decreases to 37% when Cr (VI) exists, and that decreases slightly to 53% when Fe (III) exists. Possible reasons are that Cr (VI) has a higher complexation ability with NDBC than that of Fe (III) according to the FL and EEMs FL spectra of Cr (VI) or Fe (III) with NDBC, which leads to the reduction of the major reactive species (RS) (3NDBC* and 1O2) during the photodegradation of NDBC for TC. Finally, adding Cr (VI) decreases the formation rate of 3NDBC* and 1O2 more markedly than Fe (III). This paper provides a deeper insight into the fate of DBC, metal ions, and antibiotics in the actual water body. © 2023, The Authors. All rights reserved.

关键词： Metal ions

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