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Tetracycline Hydrochloride Degradation by Activation of Peroxymonosulfate with Lanthanum Copper Ruddlesden-Popper Perovskite Oxide: Performance and Mechanism

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SSRN 2023年

作者： Xia, Yitian Li, Xiaoming Wu, You Chen, Zhuo Pi, Zhoujie Duan, Abing Fan, Yingchun Liu, Junwu College of Environmental Science and Engineering Hunan University Changsha410082 China Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha410082 China School of Resources and Environment Hunan University of Technology and Business Changsha410205 China Hunan Engineering Research Center of Mining Site Pollution Remediation Changsha410082 China

ABO3-type perovskite oxides have been regarded as a kind of potential catalyst for peroxymonosulfate (PMS) activation. But some limitations such as specific pH conditions, coexisting ion interference restrict its practical application. Herein, a lanthanum copper Ruddlesden-Popper perovskite oxide (La2CuO4) was successfully synthesized through sol-gel process and applied in activation of PMS. And for the first time the La2CuO4/PMS system was used for tetracycline hydrochloride (TC-HCl) degradation. Results showed that La2CuO4 was a potential PMS activation catalyst in the removal of antibiotics. More than 90% of TC-HCl was removed in 30min over a wide pH range of 3-11 at optimized condition (0.2g/L catalysts, 1mM PMS). La2CuO4 also displayed wide applicability in the natural water treatment process. According to the reusability and stability tests and the results of FTIR and XPS analysis, La2CuO4 had high structurally and chemically stability. Electron spin resonance (ESR) suggested that the active species including , and 1 were detected in degradation reaction. The XPS spectra of fresh and used La2CuO4 revealed that the redox cycle between surface copper and oxygen species is the core mechanism for the activation of PMS. Finally, reasonable reaction mechanisms and possible degradation pathways of TC-HCl were proposed. These results indicate that La2CuO4 can act as a potential catalyst for PMS activation to degrade TC-HCl in water. © 2023, The Authors. All rights reserved.

关键词： Lanthanum compounds

Abundance, characteristics, and distribution of microplastics in the Xiangjiang river, China

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Gondwana Research 2022年 107卷 123-133页

作者： Lingshi Yin Xiaofeng Wen Danlian Huang Zhenyu Zhou Ruihao Xiao Li Du Hongyu Su Kanglong Wang Quyang Tian Zhousha Tang Lan Gao College of Environmental Science and Engineering Hunan University Changsha 410082 China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 China School of Hydraulic Engineering Changsha University of Science and Technology Changsha 410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114 China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114 China

The source and distribution characteristics of microplastics in the freshwater environment remain to be investigated, and there are many limitations in the microplastics baseline database of freshwater area. This study investigates the characteristics of microplastic pollution in the sediments of the Xiangjiang River, China. Samples obtained were identified using stereoscopic microscopy and Fourier-transform infrared spectroscopy after oxidative digestion and density separation. The microplastic abundance in the sediment of the river ranged from 144 to 510 items/kg (dw) with an average abundance at 288 ± 60 items/kg. Furthermore, nine polymer compositions of the microplastics were detected. Upstream inflow, domestic effluent, industrial, agriculture, and air settlement are considered as sources of microplastics in Xiangjiang River. The microplastic abundance of the lower reach of the Xiangjiang River is significantly higher than those of the upper and middle reaches, particularly in Changsha and Dongting Lake areas. Different types of microplastics show a different distribution characteristic. Hydrodynamic condition is an important factor affecting the distribution of microplastics. The results of this study not only fill the gap in current baseline data on microplastic pollution, however, the data obtained serve as a reference for following studies in other freshwater areas.

关键词： Microplastics Distribution Xiangjiang River Sediment pollution

V-Modified MnCo2O4.5 Spinel Catalyst for the Synergistic Removal of Nox and Vocs from Coke Oven Flue Gas: Mechanism and Performance Study

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SSRN 2024年

作者： Chen, Zimo Zhao, Cheng Yun, Junge Chu, Rencheng Zheng, Han Feng, Xin Tong, Zhangfa Chen, Zhihang Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Guangdong Key Lab of Water & Air Pollution Control Guangdong Province Engineering Laboratory for Air Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China College of Environment and Resources Xiangtan University Xiangtan China

A dual-function catalyst, designated as V0.5Mn5Co5, has been constructed for the synergistic removal of NOx and volatile organic compounds under coke-oven flue gas conditions. The V0.5Mn5Co5 catalyst has more than 95% NOx conversion at 180-300 °C and removes 70% of ethylene at 240 °C. Besides it has excellent sulfur resistance. The catalyst satisfies the requirements of the procedure for denitrifying coking flue gas. Vanadium (V) prevents the transition dehydrogenation and oxidation of NH3 by reducing the Lewis acidic sites of the catalyst and thus inhibiting the generation of surface reactive oxygen species. NOx removal was enhanced by increasing its Brønsted acid sites. Mechanistic studies showed that the catalysts mainly perform SCR reaction through E-R mechanism, and N2O is generated through the transition dehydrogenation of NH3 and NSCR reaction. Ethylene(C2H4) oxidation followed the MvK mechanism, and there was a competitive adsorption of NH3 with C2H4, and there was a mutual inhibition between the SCR reaction and the ethylene oxidation reaction. Commercial medium and low temperature SCR catalysts are almost ineffective in the oxidation of VOCs in coking flue gas, but V0.5Mn5Co5 exhibits excellent synergistic removal of NOx and VOCs in coke oven flue gas, which indicating great promise for industrial application. © 2024, The Authors. All rights reserved.

关键词： Nitrogen oxides

Facile Fabrication of Heavily N-Doped Zn0.67 Cd0.33S Nanocatalyst with Congenital Sulfur Vacancies for Efficient Photocatalytic Reduction of Water and Hexavalent Chromium

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SSRN 2024年

作者： Yu, Hanbo Chen, Ninglu Xiong, Wei Jiang, Zhaohui Ji, Xueting Hu, Wei Li, YeWang Zhao, Yu Long, Xiao Chen, Haoyun School of Hydraulic and Environmental Engineering Changsha University of Science & Technology Changsha410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha410114 China School of Resources and Environment Hunan University of Technology and Business PRChina Changsha410205 China

Twinned zinc cadmium sulfide (ZnxCd1-xS) has been extensively studied to achieve efficient Cr(VI) reduction and H2 production under light irradiation due to its inherent homojunctions. However, long-distance migration of charge carriers and relatively low CB level inevitably cause low photocatalytic reduction ability. Herein, we developed a DMF-involved one-step solvothermal strategy to introduce N heteroatoms into Zn0.67Cd0.33S crystals incorporated with dopant-induced S vacancies. Due to the synergetic promotion of the elevated conduction band and strong interactants aggregation, recombination behavior of charge carriers was effectively impeded, resulting into increased photocurrent density (~2.4 times) and electron density (~2.8 times), as well as higher photo-reducing potential. The optimal NZCS-10 demonstrated a superior photocatalytic Cr(VI) reduction efficiency of 99.06% within 30 min, and rendered ca. 5.8- and 7.6-fold enhancement for H2 evolution rate under alkaline and acidic conditions, respectively. This study provided a universal strategy for gaining highly reductive transition metal sulfides with more active sites. © 2024, The Authors. All rights reserved.

关键词： Charge carriers

Probing the Catalytic Oxidation of Styrene on Co3o4 With Different Morphologies: Promotion by Oxygen Vacancies

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SSRN 2024年

作者： Chu, Rencheng Zhao, Cheng Yun, Junge Chen, Zimo Zheng, Han Zhao, Yanhong Feng, Xin Tong, Zhangfa Chen, Zhihang Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Guangdong Key Lab of Water & Air Pollution Control Guangdong Province Engineering Laboratory for Air Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China College of Environment and Resources Xiangtan University Xiangtan China

In this paper, three Co3O4 catalysts with different morphologies (nanoparticulate, layered, and cubic) were synthesized to control the concentration of oxygen vacancies and applied to the catalytic oxidation of styrene, and the nanoparticulate Co3O4 (Co3O4-N), which has the smallest specific surface area (38.0240 m²/g), showed the best catalytic performance (T100=247 °C). Based on various characterization data, the analysis was carried out, and the results showed that the physical structural properties are not the key factor determining the catalytic activity, and more excellent chemical properties such as oxygen vacancies determine the catalytic activity. Finally, the reaction process of styrene adsorption oxidation and the degradation of key intermediates of the reaction were investigated by in situ DRIFTS technique, which demonstrated that a high concentration of oxygen vacancies can accelerate the oxidation of important intermediates, simplify the whole styrene oxidation process, and produce fewer by-products. © 2024, The Authors. All rights reserved.

关键词： Catalytic oxidation

Boosting Charge Separation and Active Sites Exposure by Hollow S-Scheme Mose2/Fe2o3 Heterojunction for Enhanced Photocatalytic Peroxymonosulfate Activation Towards Ciprofloxacin Removal

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SSRN 2024年

作者： Li, Lu Niu, Cheng-Gang Guo, Hai Yang, Ya-Ya Liu, Hui-Yun Yan, Ming College of Environmental Science Engineering Key Laboratory of Environmental Biology Pollution Control Ministry of Education Hunan University Changsha410082 China School of Resources and Environment Hunan University of Technology and Business Changsha410205 China School of Geographic Sciences Xinyang Normal University Xinyang464000 China

Regulating the properties of heterogeneous catalyst for efficient PMS activation to pollutants degradation remains a challenge in photo-assisted Fenton-like reaction (PF) system. In this study, the novel S-scheme MoSe2/Fe2O3 (H-FMS) heterojunction with hollow nanostructure was successfully developed as visible-light-driven PMS activator for removal of ciprofloxacin (CIP). The prepared H-FMS catalyst in PMS/H-FMS/light system exhibits outstanding photocatalytic performance for CIP degradation, achieving 95.92% removal of 5 mM CIP in 30 min with 0.5 mM PMS. The construction of S-scheme heterojunction provides photoinduced carriers with longer lifetime and higher redox abilities, thus sufficient photogenerated carriers are supplied to directly activate PMS. Simultaneously, the hollow nanostructure possessing multiple light reflection and scattering behaviors further facilitates the utilization of visible light. More importantly, high concentration of photoinduced electrons with high reduction ability in MoSe2 is conducive to continuous exposure of Mo4+ active sites for PMS activation through cycling between transition metal valence states. Overall, effectively separated electron-hole pairs and continuously exposed transition mental active sites both contribute to efficient activation of PMS as well as multi-path generation of ROS, leading to significant improvement in CIP degradation. The results of quenching experiment, ESR technology, HPLC and DFT calculation confirm that both free radicals ([[EQUATION]], •OH and [[EQUATION]]) and non radicals (1O2 and h+) attack the active sites of CIP possessing high Fukui index, thus contributing to CIP degradation. This work would provide a novel insight for future development and application of photocatalytic PMS activation catalysts in water remediation. © 2024, The Authors. All rights reserved.

关键词： Chemical activation

Numerical modeling and parametric analysis of temperature distribution in soil based on water content variation under radio frequency heating for in-situ thermal remediation

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Science of the Total Environment 2024年 957卷 177267页

作者： Qi, Wenhao Lou, Wei Sheng, Anxu Xu, Wenjie Luo, Yongqiang Wu, Haibin Yin, Hao Chen, Jing Wu, Xiaohui Wang, Linling Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Hunan Provincial Engineering Research Center for Resource Recovery and Safe Disposal of Industrial Solid Waste Hunan Hikee Environmental Technology Co. Ltd. Changsha410032 China Institute of Resources and Environmental Engineering Shanxi University Taiyuan030006 China Yellow River Laboratory of Shanxi Province Taiyuan030006 China

Radio frequency heating (RFH) is recognized as an efficient and economical method for volatilizing organic pollutants from contaminated soils. Although some numerical simulations have been conducted to predict temperature changes during RFH, models that account for effects of water content (WC) variation on dielectric properties and temperature evolution in soil were rarely reported. To address this, a three-dimensional numerical model integrating electromagnetic-thermal conversion, heat transfer, and mass transfer was developed with coupling dynamic changes in WC and corresponding impacts on soil properties. The effects of soil types and RFH engineering parameters on temperature evolution and energy utilization were evaluated. The model's temperature prediction was validated using experimental data, indicating that temperature decreases outward from hot electrode, with high-temperature regions forming at the top and bottom regions near electrode. Water evaporation in soil causes a temperature plateau with >76.25 % of energy utilized for heating and evaporating water during 60-d RFH. Moreover, higher soil WC could increase electromagnetic-thermal conversion capability, counteracting the negative impact of increased specific heat capacity on temperature rise. Thermophysical properties of soil are crucial in RFH: sand, with lower specific heat capacity and higher thermal conductivity, results in faster heating rates. While, clay, with higher density and specific heat capacity, results in lower heating rates but greater energy utilization efficiency. Low-power RHF and wider well spacing improve the uniformity of temperature distribution but require more time to reach target temperatures. Moreover, input power influences the magnitude and timing of optimal energy utilization efficiency, while well spacing primarily affects timing. The models developed in this study provide essential guidance for RFH-based soil remediation projects. © 2024

关键词： Well spacing

Genome-Wide Exploration of Mtp Gene Family in Mustard (Brassica Juncea L.): Expression Networks Revealed the Underlying Core Modules and Specific Response Patterns Under Heavy Metal Stress

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SSRN 2024年

作者： You, Liang Chen, Hao Jiang, Guoxiang Yuan, Jiong Yuan, Yuhui Yan, Mingli Hu, Junhe Xiang, Guohong Duan, Renyan Chen, Yong Liu, Xianjun College of Agriculture and biology Hunan University of Humanities Science and Technology Key Laboratory of Development and Utilization and Quality and Safety Control of Characteristic Agricultural Resources in Central Hunan of College of Hunan Province Hunan Loudi417000 China College of Agronomy Hunan Agricultural University Changsha410128 China Crop Research Institute Hunan Academy of Agricultural Sciences Changsha410125 China

The Metal Tolerance Protein (MTP) family members play a crucial role in the transport and tolerance of divalent metal cations. However, a comprehensive study of MTP genes in Brassica juncea and their expression patterns under heavy metal (HM) exposure remains unclear. In this study, we identified 33 BjMTP genes through the HMMER program (Cation_efflux;PF01545) and BLAST analysis. Subsequently, these 33 BjMTP members were subjected to a series of bioinformatics methods, including physicochemical properties, phylogenetic tree, conserved motifs, protein structures, collinearity, spatiotemporal expression patterns by RNA-seq data, GO enrichment, and expression profilings under six HM stresses. As a result, the BjMTP genes were classified into three subgroups (Zn-CDF, Zn/Fe-CDF, and Mn-CDF) and seven branches (G1, G4, G5, G6, G7, G8, and G12). We also successfully identified specific genes and crucial expression modules within the BjMTP family genes that respond to various HM stresses. Notably, ***4 and ***5 exhibited strong responses to all six HM inductions, suggesting their vital role in facilitating plant tolerance to HM stresses. These findings provide excellent gene resources for the genetic improvement of HM-tolerant rapeseed and the remediation of HM-contaminated soils. © 2024, The Authors. All rights reserved.

关键词： Heavy metals

Study of the Interaction Mechanism between Human Serum Albumin and Ti3c2tx with Different Degrees of Oxidation by Multi-Spectroscopic Method and Molecular Docking

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SSRN 2022年

作者： Tan, Chunhu Zhang, Tingting Wang, Gongyin Zhang, Libin Liu, Chang Li, Weihua Li, Jiansheng Lu, Rui Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui University Hefei230601 China School of Environment and Energy Engineering Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu University Hefei230601 China

At present, despite the wide application of Ti3C2Tx in various fields, little information is available regarding its toxicity to humans, thus, it is necessary to study its interactions with human proteins as well as its biotoxicity. In the present study, spectroscopic analysis and molecular simulation were used to investigate the interaction mechanism between human serum albumin (HSA) and Ti3C2Tx with different oxidation degrees. The three prepared Ti3C2Tx materials with different oxidation degrees were analyzed by X-ray diffractometer, X-ray photoelectron spectroscopy, scanning electron microscope and transmission electron microscope, and the results demonstrate that TiO2 nanoparticles are formed during the oxidation process. In conclusion, the results of the ultra violet spectrum, fluorescence spectra and zeta potential measurements showed that fully oxidized Ti3C2Tx (F-Ti3C2Tx) has a greater binding ability to HSA than unoxidized Ti3C2Tx (U-Ti3C2Tx), followed by partially oxidized Ti3C2Tx (P-Ti3C2Tx). Based on synchronous fluorescence, circular dichroism and infrared characterization, it has been determined that with a gradual increase of Ti3C2Tx oxidation degree, its effect on the conformation of HSA increases, followed by F-Ti3C2Tx > P-Ti3C2Tx > U-Ti3C2Tx. Further analysis of the fluorescence binding ability revealed that hydrogen bonds play the major role in the interaction between HSA and Ti3C2Tx. © 2022, The Authors. All rights reserved.

关键词： Fourier transform infrared spectroscopy