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Who does better for in-situ eutrophic remediation in anoxic environment improvement and nutrient removal: MgO2 versus CaO2

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Chemosphere 2023年第1期336卷

作者： Xu, Yao Xu, Shuang Qian, Yajie Liu, Tongcai Zhang, Longlong Li, Dapeng Zhang, Yalei Chen, Jiabin Zhou, Xuefei State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215000 China College of Environmental Science and Engineering Donghua University Shanghai201620 China

The long-term insufficient dissolved oxygen (DO), excessive nitrogen (N) and phosphorus (P) have become the main causes of the troublesome eutrophication. Herein, a 20-day sediment core incubation experiment was conducted to comprehensively evaluate the effects of two metal-based peroxides (MgO2 and CaO2) on eutrophic remediation. Results indicated that CaO2 addition could increase DO and ORP of the overlying water more effectively and improve the anoxic environment of the aquatic ecosystems. However, the addition of MgO2 had a less impact on pH of the water body. Furthermore, the addition of MgO2 and CaO2 removed 90.31% and 93.87% of continuous external P in the overlying water respectively, while the removal of NH4+ was 64.86% and 45.89%, and the removal of TN was 43.08% and 19.16%. The reason why the capacity on NH4+ removal of MgO2 was higher than that of CaO2 is mainly that PO43− and NH4+ can be removed as struvite by MgO2. Compared with MgO2, mobile P of the sediment in CaO2 addition group was reduced obviously and converted to more stable P. Notably, the microbial community structure of sediments was optimized by MgO2 and CaO2, which showed that the relative abundance of anaerobic bacteria decreased and that of aerobic bacteria increased significantly, especially some functional bacteria involved in the nutrient cycle. Taken together, MgO2 and CaO2 have a promising application prospect in the field of in-situ eutrophication management. © 2023 Elsevier Ltd

关键词： Nitrogen

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Autoencoded Chemical Feature Interaction Machine Learning Method Boosting Performance of Piezoelectric Catalytic Process

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SSRN 2024年

作者： Zhuang, Wei Zhao, Xiao Zhang, Yiying Luo, Qianqian Huo, Zhen Sui, Minghao Zhang, Lihua State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Academy for Engineering and Technology Fudan University Shanghai200000 China School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen518055 China School of Environmental Science and Engineering Jihua Laboratory China

Piezoelectric catalytic process can reduce energy consumption in water treatment processes. However, the design of high-performance piezoelectric materials and the search for operating parameters are still challenging tasks. This study explored a modified machine learning (ML) technology, autoencoded chemical feature interaction machine learning (AutoCFI-ML), by employing the autoencoder and factorization machine for designing piezoelectric materials and optimizing operating parameters to improve the performance of the piezoelectric catalytic process. This method improved the performance of regression-based ML methods through carefully designed chemical features boost. The extreme gradient boosting (XGBoost) model was considered the optimal model with R2 = 0.88 and RMSE = 1.02. The catalyst composition, initial pH value, catalyst/pollutant dosage ratio, and ultrasound power were identified as relatively important features among the 34 features. When targeting RhB or phenol as the typical pollutant, the errors between the prediction results of the trained AutoCFI-XGBoost model and the experimental results in the reverse experiment were both less than 10%. This work provides novel insights and improvement strategies by ML technique to design piezoelectric catalysts and optimize operating parameters for enhancing the performance of piezoelectric catalytic process, improving the application potential of the piezoelectric catalytic process. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

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Alkali leaching-electrowinning recycling of Zn from hazardous wastes generated in the electroplating industry: A study on the effect of additives

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Chemical Engineering Research and Design 2025年 219卷 249-258页

作者： Yidi Gao Suiyi Zhu Weilu Yang Zhan Qu Yang Yu College of Resources and Environment Zhongkai University of Agriculture and Engineering 501 Zhongkai-road Guangzhou China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing Jiangsu 210023 China Biology Department Hope College A. Paul Schaap Science Center 35 East 12th Street Holland MI 49423-3605 United States

Recycling heavy metals from hazardous electroplating sludge was a hot spot to reduce sludge production and minimize environmental risks. In this study, a high-purity zinc (Zn) sponge was recovered from actual Zn-bearing electroplating sludge through a combined process of alkaline leaching and electrowinning. The sludge contained 36.2 wt% Zn, 9.4 wt% Fe, and few impurities of Al/Ca/Si, and was directly leached with 7 M NaOH at 70 °C. Subsequently, 95 % of the Zn was efficiently separated as a sponge from the leachate using constant current electrolysis, achieving an electrowinning rate of 15.9 g/min·m². The resulting leachate, containing Zn, Al, and Si, was purified by the addition of limestone, which removed 82.6 % of Al and 72.2 % of Si, and was then completely reused in the subsequent leaching cycle. The addition of organic additives—EDTA-2Na, sodium citrate, polyethylene glycol, sodium dodecyl sulfonate, L-arginine, and gelatin—to the leaching and electrowinning systems had little effect on the leaching of Zn, Al, and Si or on the electrowinning of Zn, but did alter the morphology of the Zn sponge. In summary, when considering only the recovery efficiency of Zn from electroplating sludge, the effect of organic additives under high NaOH concentration was found to be negligible.

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Effects of the Microbial Community on Primary Soil Productivity During 60 Years of Tidal Flats Reclamation

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SSRN 2023年

作者： Wang, Jingye Wang, Xiaohan Mu, Yawen Zhang, Lijuan Yang, Jianghua Zhang, Xiaowei State Key Laboratory of Pollution Control & Resource Reuse School of the Environment Nanjing University Nanjing210023 China Jiangsu Provincial Environmental Monitoring Center Nanjing210019 China College of Civil Engineering and Architecture Zhejiang University Hangzhou310058 China

With the rapid pace of globalization and industrialization, the reclamation of tidal flats has emerged as the primary means for human beings to develop residential and production spaces in coastal regions. However, there remains an inadequate understanding of the soil ecosystem's succession pattern and service value throughout the reclamation process. This study employs environmental DNA technology to precisely monitor the changes in the soil microbial community over 60 years of tidal flat reclamation in China’s Yangtze River Delta region, aiming to identify the key groups that contribute to primary soil productivity. The findings demonstrate distinct patterns and contributions of species diversity in prokaryotic and eukaryotic communities during the reclamation process. Specifically, the bacterial community is primarily affected by the duration of reclamation;initially, there is a decrease of approximately 2.4% in overall alpha diversity within the first five years, followed by a rapid increase. Eventually, the diversity reaches its maximum level and stabilizes after nearly 20 years of reclamation. On the other hand, the eukaryotic community is predominantly influenced by electrical conductivity, with alpha diversity increasing;however, it remains lower than that of the prokaryotes. Network analysis of the prokaryotic community reveals that Actinobacteria and Firmicutes gradually establish themselves as critical species in the network over time, with their prominence further influenced by human cultivation. Moreover, changes at both the species and phylum levels display a highly positive correlation with biomass. This indicates the potential role of Actinobacteria and Firmicutes in enhancing primary soil productivity. A deeper understanding of the underlying mechanisms involving these bacteria can contribute to promoting sustainable agricultural development in reclaimed soil. © 2023, The Authors. All rights reserved.

关键词： Reclamation

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Oxygen Vacancies-Dominated Reactive Species Generation from Peroxymonosulfate Activated by Moo3-X for Pollutant Degradation

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SSRN 2023年

作者： Wang, Xiaolei Liu, Xiantang Tong, Yunping Liu, Cun Ding, Yingzhi Gao, Juan Fang, Guodong Zha, Xianghao Wang, Yujun Zhou, Dongmei College of Chemistry and Environmental Science Kashi University Kashi844000 China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China University of Chinese Academy of Sciences Beijing100049 China

Interface oxygen vacancies (OVs) are commonly used to improve the catalytic performance of activators in persulfate-based advanced oxidation processes, but the underlying mechanism was not fully explored. This work reports a facile heat treatment method to regulate OVs in MoO3-x to elucidate the mechanism of peroxymonosulfate (PMS) activated by OVs to degrade organic pollutants. Electron spin resonance, free radical quenching, X-ray photoelectron spectroscopy, and Raman spectroscopy confirmed that both reducing Mo species and OVs of MoO3-x surface were responsible for PMS activation. Further experiments and Density Function Theory (DFT) calculation suggest that OVs in MoO3-x induced the formation of superoxide radical (O2•−), and then O2•− was transformed into singlet oxygen (1O2) or mediated PMS activation to generate radicals, which contritbued to 70.2% of PCB28 degradation. The steady-state concentrations of free radicals calculated with the kinetics model show that OVs were more favorable to mediate PMS to generate hydroxyl radicals (•OH) under oxic conditions, while reducing Mo species would like to induce PMS to produce sulfate radicals (SO4•−). Overall, this study is dedicated to a new insight into the in-depth mechanism of PMS activation by OVs-rich catalysts and provides a novel strategy for reactive species regulation in PMS based oxidation process. © 2023, The Authors. All rights reserved.

关键词： Oxygen vacancies

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Solar-driven butanedione-based disinfection: A by-product-free approach to pathogen control

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Fundamental Research 2025年

作者： Zewen Ji Wenchang Zhang Jianghua Yang Peng Peng Haoran Chen Shujuan Zhang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210023 China

The imperative for environmentally friendly water disinfection methods has spurred the exploration of innovative solutions to mitigate microbial threats in water while simultaneously controlling the formation of harmful disinfection by-products (DBPs). This study introduces the combination of butanedione (BD) and solar irradiation as an effective method to inactivate pathogenic bacteria, including Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus . Acetyl radicals produced by solar activation of BD homolytic cleavage combined with dissolved oxygen to form acetyl peroxyl radicals, which were the main reactive species in the disinfection process. These acetyl peroxyl radicals attack bacterial cell membranes, escalate intracellular reactive oxygen species, and induce oxidative degradation of vital intracellular components such as enzymes and nucleic acids. Remarkably, the BD/Solar system demonstrated exceptional disinfection efficacy across a range of water quality parameters, achieving rate constants that were 5.2-98.1 times greater than those of other advanced disinfection processes that utilize H 2 O 2 , peroxydisulfate, or periodate in combination with solar irradiation. Notably, there was no evidence of bacterial regrowth and no formation of typical halogenated DBPs after treatment. These findings highlight the potential of this novel solar-powered system as a green approach for controlling environmental pathogens in a variety of waters, especially in sunlit swimming pools.

关键词： Bacterial inactivation Diketone Acetyl peroxyl radical Metabolomics Disinfection by-products (DBPs)

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Carbon-Based Materials for Low Concentration CO2 Capture and Electrocatalytic Reduction

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SSRN 2024年

作者： Hu, Yanxi Ding, Yangyang Xie, Liangyiqun Li, Hanyu Jiang, Yujing Gong, Ke Zhang, Aidi Zhu, Wenlei Wang, Yuanyuan State Key Laboratory of Coordination Chemistry State Key Laboratory of Pollution Control and Resource Reuse State Key Laboratory of Analytical Chemistry for Life Science The Frontiers Science Center for Critical Earth Material Cycling School of Chemistry and Chemical Engineering School of the Environment Nanjing University Nanjing210023 China Engineering Research Center of Functional Polymer Membrane Materials of Jiangsu Province Nanjing Bready Advanced Materials Technology Co Ltd 8 Baoding Road Nanjing211103 China

The gradual increase in carbon dioxide (CO2) concentration in the atmosphere has been recognized as a significant problem for humankind. CO2 flue gas is one of the most apparent contributing sources of emissions. CO2 capture and conversion are environmental-friendly and efficient ways to reduce atmospheric emissions of carbon dioxide from flue gases. Considering the traditional expensive gas purification process of low-concentration CO2, the low-cost capturing and electrocatalytic CO2 reduction (ECR) at low concentration by newly-developed carbon-based materials provide an attractive approach to convert low-concentration CO2 in flue gas into high-value fuels and chemicals. Developing and integrating carbon-based capturing and catalytic materials with an understanding of the mechanism has a promising future and will promote this technology toward practical application. This review describes recent progress in the design, preparation, and structural characterization of existing carbon-based materials for the capture and catalysis of low-concentration CO2. The crucial factors of capturing and catalysis performance of all the carbon-based materials are also summarized. Furthermore, the review presents problems and challenges of existing research and envisions research directions. We also discuss the prospects of the industrialization of low-concentration CO2 capture and ECR. The remaining technological challenges and future directions for the enhancement and application of carbon-based materials for CO2 capture and electrocatalytic reduction are highlighted. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Sorption behavior of trichloroethylene in arsenic contaminated soil: Batch experiment and mechanism insight

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Journal of Environmental Sciences 2025年

作者： Wei Zhang Zongcheng Yao Mengting Li Xueqi Zhang Yuting Wang Dongmei Zhou Qiming Xian State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210023 China

Co-contamination of chlorinated hydrocarbons and arsenic is frequently observed in the chemically contaminated sites and their surroundings in China. However, the interaction between these complex contaminants in soil remains is unclear. This study collected ten background soils with varying properties from various regions throughout China, and investigated the sorption and desorption process of trichloroethylene (TCE) in the exogenous arsenate (As(Ⅴ)) contaminated soils. The results of the batch experiments demonstrated that TCE was rapidly adsorbed by soil organic matter (SOM). Both SOM and minerals contributed to the slow sorption equilibrium process. The sorption isotherms were linear, while the desorption isotherms were non-linear. In Heilongjiang (HLJ) soil, As(V) contamination increased the TCE sorption contribution of black carbon and decreased the contribution of minerals. During the aging process of As(Ⅴ) in soils, SOM was replaced by AsO 4 3− , which formed complexes with soil Fe/Al oxides, resulting in a significant increase in hydroxyl groups and hydrophilicity of the soil surface. This hindered the hydrophobic sorption of TCE. Additionally, As(Ⅴ) contamination affected soil geotechnical properties, and the As-cations precipitation could block the sorption micropores. The collective results of these processes caused a reduction in the sorption of TCE on the majority of As(V)-contaminated soils (702-5854 mg/kg) in comparison to background soils (1194-6374 mg/kg). The systematic investigation of sorption-desorption behaviors of TCE in As(V)-contaminated soils will provide a scientific basis for the calculation of soil environmental capacity of heavy metal - organic combined contamination in the future.

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Distribution patterns and influencing factors of PFAS in soils: A meta-analysis

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Environmental Research 2025年 279卷 121806页

作者： Yang, Xin Song, Chenzhuo Ren, Mingxue Kong, Yi Cui, Xinyi State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Due to their high emission and persistence, per- and polyfluoroalkyl substances (PFAS) are ubiquitously distributed in the environment, with soil increasingly serving as a major medium for PFAS. Currently, research on the environmental distribution of PFAS primarily focuses on surface water and groundwater, while systematic global investigations into PFAS distribution in soil remain limited. In this study, we collected PFAS concentrations data from literatures published in 2006–2024 and Map of Forever pollution in Europe. PFAS concentrations in global soil exhibited spatial heterogeneity (n.d. – 1838 ng/g), with relatively higher levels in Europe, the U.S., and Eastern China. For temporal trend, PFOA, PFHxS, and PFOS generally decreased in the time span of 2005–2019, but the declining trend was relatively sharper in the U.S. compared with China. The meta-analysis indicated that soil properties, including soil texture, organic carbon content, total nitrogen content, and pH, as well as socioeconomic levels such as GDP per capita, per capita consumption expenditure, population density, and industrial proportions, were key factors affecting the distribution of PFAS in soil. Emerging PFAS showed regional differences in detection frequencies, with HFPO-DA (63.84 %–100 %) and 6:2 Cl-PFESA (69.38 %–100 %) predominating in China, 6:2 FTAB (78 %) in the U.S, PreFOSs and PAPs (90 %–100 %) in Europe. This study provides information on the current status of PFAS pollution in soil and key factors affecting its regional distribution, which is beneficial for strengthening the investigation of PFAS soil pollution in areas with less research and developing control and management strategies for high pollution areas. © 2025 Elsevier Inc.

关键词： Groundwater pollution

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Efficient alleviation of ultrafiltration membrane fouling in treatment of dye effluent by a novel cationic dendritic starch-based flocculant

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Journal of Environmental Sciences 2025年

作者： Yuyang Wang Wenxiao Ren Hu Yang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210023 China

Dye effluent has become a challenging problem in wastewater treatment. Ultrafiltration (UF) is a popular method to purify dye effluent, but membrane fouling is a major problem seriously restricting its wide applications. A novel cationic dendritic starch-based flocculant (CL-CS-G) was designed and fabricated. The performance and mechanism of CL-CS-G in alleviation of membrane fouling during the successive flocculation-UF treatment of Acid Green 25 effluent, a typical industrial dye, were evaluated. Compared with polyaluminum chloride (PAC), CL-CS-G showed a lower loss of water flux but a less required dosage, besides, this dendritic flocculant could effectively reduce both reversible and irreversible fouling, and its irreversible fouling resistance was even reduced by 91.2 %, because of its distinct structural feature. The hyperbranched structure of CL-CS-G, with relatively loose and net-like configuration but also abundant reactive end-groups contained, caused higher bridging and sweeping flocculation effects in addition to charge neutralization; moreover, produced larger but looser dye flocs, than PAC and its linear analogue, resulting in a looser and porous cake layer, more easily cleaned up, and thus a higher efficiency in alleviation of membrane fouling. The high performance of CL-CS-G in flocculation and alleviation of membrane fouling was confirmed by its high economical efficiency, good reusability of the treated membrane, and effective purification of two other dye effluents and a simulated real dye mixture. CL-CS-G is an efficient, low cost and environmental-friendly flocculant, and thus has high application potentials in pretreatment of dye effluents and alleviation of membrane fouling.

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