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engineering Cu-Ce@Al2O3 core-shell catalyst for the efficient simultaneous catalytic removal of COS and H2S

Nano Materials science 2025年

作者： Gao, Panting Song, Xin Sun, Lina Cui, Rongji Tang, Zhicheng Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Yantai264006 China National Engineering Research Center for Fine Petrochemical Intermediates State Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China

The sulfur content of blast furnace gas has an impact on its utilization, which makes the deep desulfurization of blast furnace gas a necessity. In the present study, aluminum-based core-shell microsphere catalysts were synthesized using aqueous method for catalytic removal of COS and H2S. The Cu-Ce@Al2O3 is more conducive to the generation of oxygen vacancies. The distinctive core-shell configuration presents a multitude of active sites, thereby reducing the competitive adsorption of H2S and COS on the catalyst surface. The presence of Cu2+ species is of particular significance, as it serves to facilitate the hydrolysis of COS and the simultaneous removal of H2S. The Ce3+ species facilitates the oxidation of the S species, thereby enhancing the desulfurization effect. The Al2O3 protective shell prevents the Cu-Ce active component from being covered by sulfur deposition, thereby maintaining its reactivity. The addition of Al2O3 as a shell can enhance the alkalinity of the catalyst, facilitating the adsorption of COS and H2S on the surface and, in turn, improving the catalyst's reaction activity. The core-shell structure proved more conducive to promoting the redox capacity of Cu+/Cu2+ and Ce4+/Ce 3+. CuO (110) represents the primary active center of the COS hydrolysis reaction, yet it also leads to over-oxidation of H2S. In contrast, CeO2 was conductive to the formation of HSCOOH and S0. CuO, on the other hand, was favorable to the dissociation of HSCOOH and the oxidation of S0. © 2025 Chongqing University

关键词： Desulfurization

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Research on the Remediation Effects of Amd Based on Hydrogeochemical Zonation: A Typical Metal Mine in China

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SSRN 2024年

作者： Jie, Tang Xin, Liu Bo, Li Yuhan, Nie Xin, Gao Man, Gao Guo, Liu State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu610059 China State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation & Water Pollution College of Ecology and Environment Chengdu University of Technology Chengdu610059 China College of Environmental Science and Engineering China West Normal University Nanchong637001 China

Mining activities disrupt the natural underground oxidative environment, leading to increased oxidation of metal sulfides such as pyrite and the subsequent formation of highly acidic Acid Mine Drainage (AMD) with high concentrations of Fe and SO42-. However, applying generic plugging and backfilling methods without considering the specific post-mining subsurface oxidizing environments of different metal mines often yields minimal results. To address this issue and develop targeted remediation methods for AMD in Dexing, China, a study was conducted. 15 water samples from flood and dry periods, as well as 15 borehole samples, were collected for hydrogeological and chemical analysis. For the first time, the study proposed that the redox zone could be identified and delineated through vertical analysis of water storage media, mineral composition, and hydrochemical characteristics. A hydrogeochemical conceptual model was constructed, revealing that AMD formation primarily occurs in oxidative environments, with distinct hydrogeological zones characterized by the oxidation zone and transition zone. Based on the redox zone characteristics of the study area, actual engineering sealing was performed on the oxidation zone and transition zone of the No. 23 cavity. The results of the remediation efforts showed significant improvements in water quality. The pH increased from 2.54 before remediation to 4.45, indicating a reduction in acidity. The concentration of SO42- and TFe diminished manifestly, decreased respectively by 46.62% and 83.97% from 1360 mg/L and 147 mg/L before governance to 726 mg/L and 23.56 mg/L. And the concentration of Ca2+, Mg2+, K+, Na+, TMn and Cl- were respectively reduced by 22.16%, 44.2%, 36%, 28.19%, 10.71% and 39.52%. This study provides a novel idea and valuable reference for the refined identification and classification of redox zone after metal mine exploitation and the targeted plugging and governance of cavities that produce AMD. © 2024, The Autho

关键词： Sulfur compounds

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Optimizing Flame Spray Pyrolysis: Through in Situ Reduction and Oxygen Vacancy Trapping Synthesis Single-Atom Catalysts

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SSRN 2023年

作者： Zheng, Yaru Ju, Jie Jiang, Jiechao Yang, Hong Jiang, Hao Zhang, Ling Li, Chunzhong Hu, Yanjie Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Environmental Friendly Materials Technical Service Platform School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China

Single-atom catalysts (SACs) have gained significant attention in the field of heterogeneous catalysis. We report the preparation of metal oxide-support single-atom Pd catalysts by Flame Spray Pyrolysis (FSP) method. By using the quenching ring to introduce a hydrogen atmosphere at high system temperature (>2000 K), this technique enables the preparation of oxygen-rich defective TiO2, optimizing the catalyst synthesis process. Additionally, the distribution and electronic structure of Pd were adjusted at a hydrogen atmosphere, this adjustment made the oxygen vacancies more effective in trapping Pd atoms in the atmosphere, resulting in the formation of Pd-SA/TiO2, thereby avoiding their agglomeration into Pd nanoparticles. Notably, Pd-SA/TiO2 achieves 100% CO2-to-CO selectivity in the photocatalytic CO2 reduction reaction and exhibits a high catalytic activity of 56.84 μmol g-1 h-1. Our research offers a novel approach to regulate the challenging anchoring process and enhance the microenvironment of single-atom metals for the synthesis of advanced SACs. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Cu Inanchored Mno/Carbonaceous Frameworks Trigger Peroxymonosulfate Activation for Enrofloxacin Degradation: ROS Generation and Pollutant Attacking Processes

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SSRN 2024年

作者： Niu, Huai-Yuan Dong, Zheng-Tao Guo, Hai Yang, Ya-Ya Li, Jin-Cheng Yan, Ming Li, Ji-Shan Niu, Cheng-Gang Yang, Wen-Jie State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha410082 China College of Environmental Science and Engineering Key Laboratory of Environmental Biology and Pollution Control Ministry of Education Hunan University Changsha410082 China School of Resources and Environment Hunan University of Technology and Business Changsha410205 China Hunan University China

Despite Fluoroquinolone antibiotics (FQs) removal in peroxymonosulfate (PMS) activation have been widely researched and the outstanding degradation performance have been gained, the detailed processes by which reactive oxygen species attack pollutants have not been adequately studied. In this study, a Cu/MnO catalyst, denoted as 4CuMn/C-800, is anchored onto carbonaceous frameworks derived from biomass sources using a one-step calcination method for investigation. Benefiting from the sp2 unsaturated carbon as well as the synergistic effect between Cu2+/Cu+/Cu and Mn3+/Mn2+ bimetallic redox electron pairs, the prepared 4CuMn/C-800 material possesses excellent enrofloxacin (ENR) removal performance, where 85.5% of ENR is degraded in 80 min, and maintains relatively high catalysis performance even in the various reaction conditions (reaction pH, reaction temperature, existing anions etc.). The analysis reveals the 1O2 and •O2-, as the dominate ROS, continuously attack the specific active sites of ENR molecules until they are mineralized. In detail, the generated •O2- mainly attacks the piperazine ring, while the formed 1O2 assaults the quinolone group of ENR. By combining density functional theory (DFT) calculations with LC-MS analysis, we propose four distinct pathways for ENR degradation in the 4CuMn/C-800/PMS system. In summary, this study offers a novel and practical approach to design metal/metal oxide/carbon catalysts and enhances our understanding of the mechanisms behind ROS-driven PMS activation. © 2024, The Authors. All rights reserved.

关键词： Manganese oxide

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Navigating the Dual Pathways of Ion Removal in Flow-Electrode Capacitive Deionization: Capacitive Trapping vs. Electrodialytic Migration

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SSRN 2025年

作者： Gu, Haibo Hou, Chengsi Mao, Yunfeng Wu, Deli School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

By introducing flowing electrodes, FCDI enables desalination through dual mechanisms of electrodialytic and capacitive effects. Clarifying their distinct roles is essential to advance tailored system design and performance enhancement. This work elucidates the antagonistic interplay between capacitive trapping and electrodialytic migration in flow-electrode capacitive deionization (FCDI) through both electrochemical characterization and multiphysics modeling. Experimental analyses reveal that elevated flow rates enhance electrodialytic migration but impair capacitive adsorption. Multivariate parametric studies demonstrate that capacitive dominance prevails at high current densities and low electrolyte concentrations, whereas electrodialytic effects peak under high electrolyte concentration and moderate flow rates. The balance between the effects of electrodialysis (ED) and capacitive deionization (CDI) is greatly impacted by convective mass transfer, which is caused by the electrode flow rate. While higher solid weight percentages in the flow electrode improve the CDI effect by increasing the number of active sites for salt adsorption, increased electrode flow rates maximize the ED effect by encouraging ion transport in the electrolyte. In short words, strategies to promote free ions dispersing in the electrolyte would enhance the electrodialytic contribution, whereas the concentration polarization would benefit the capacitive contribution. This work opens the door for the exploration of upgrading FCDI architectures and optimizing operation parameters while providing insights into the intricate interactions within the system. © 2025, The Authors. All rights reserved.

关键词： Desalination

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Integrated Photoheterotrophic and Photoautotrophic Membrane Bioreactor for Sustainable 1,2-Dichloroethane Detoxification in Petroleum Wastewater

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SSRN 2024年

作者： Alhajeri, Nawaf S. Tawfik, Ahmed Al-Fadhli, Fahad M. Elsamadony, Mohamed Meng, Fangang Department of Environmental Sciences College of Life Sciences Kuwait University P.O. Box 5969 Safat13060 Kuwait Department of Civil and Environmental Engineering Department of Chemical Engineering College of Engineering and Petroleum Kuwait University P.O. Box 5969 Safat13060 Kuwait School of Environmental Science and Engineering Sun Yat-sen University Guangzhou510006 China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou510006 China

The study addressed the challenge of treating petroleum industry wastewater with high concentrations of 1,2-dichloroethane (1,2-DCA) ranging from 384 to 1654 mg/L, which poses a challenge for bacterial biodegradation and algal photodegradation. To overcome this, a collaborative approach using membrane bioreactors (MBRs) that combine algae and bacteria was employed. This synergistic method effectively mitigated the toxicity of 1,2-DCA and curbed MBR fouling. Two types of MBRs were tested: one (B-MBR) used bacterial cultures and the other (AB-MBR) incorporated a mix of algal and bacterial cultures. The AB-MBR significantly contributed to 1,2-DCA removal, with algae accounting for over 20% and bacteria for approximately 49.5% of the dechlorination process. 1,2-DCA metabolites, including 2-chloroethanol, 2-chloro-acetaldehyde, 2-chloroacetic acid, and acetic acid, were partially consumed as carbon sources by algae. The microbial diversity in AB-MBR surpassed that in B-MBR, with a notable increase in Proteobacteria, Bacteroidota, Planctomycetota, and Verrucomicrobiota. Furthermore, AB-MBR showed a significant rise in the dominance of 1,2-DCA-degrading genus such as Pseudomonas and Acinetobacter. Additionally, algal-degrading phyla (e.g., Nematoda, Rotifera, and Streptophyta) were more prevalent in AB-MBR, substantially reducing the issue of membrane fouling. © 2024, The Authors. All rights reserved.

关键词： Bioreactors

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Construction of Superhydrophilic/Superhydrophobic Composite Photocatalysts for Efficient Gas-Liquid-Solid Three-Phase Photocatalytic Degradation of Methyl Mercaptan

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SSRN 2024年

作者： Yang, Zichang Xu, Yuyao Lu, Xingkai Yao, Xiaolong Li, Changming Gao, Hainan Wu, Chao Yao, Zhiliang He, Li School of Light Industry Science and Engineering Beijing Technology and Business University Beijing100048 China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business University Beijing100048 China UKCRIC Advanced Infrastructure Materials Laboratory Department of Civil and Environmental Engineering Imperial College London South Kensington LondonSW7 2AZ United Kingdom

Photocatalytic oxidation technology holds considerable promise for effectively removing volatile organic compounds. However, conventional gas-solid photocatalytic technology is hindered by limitations, notably a low mineralization rate. This study introduces an innovative gas-liquid-solid photocatalytic oxidation system that utilizes a superhydrophilic/superhydrophobic photocatalyst for the efficient removal of methyl mercaptan. By synthesizing superhydrophobic Cu-doped UiO-66 and combining with TiO2, the resulting OCUN/T photocatalysts was thoroughly chatacterized and tested under various conditions. The system consistently maintains a high removal rate (exceeding 77.5%) and a substantial mineralization rate of methyl mercaptan over 10 hours operation. Remarkably, the removal efficiency of methyl mercaptan can reach up to 70.14% at sunlight intensities exceeding 35×1000 lm. Additionally, a detailed mechanism for the degradation of methyl mercaptan via the gas-liquid-solid photocatalytic oxidation system is proposed, presenting a novel and cost-effective method for the VOCs removal. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

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A Novel Biosensor Based on Antibody Controlled Sda and Hcr Double Signal Amplification for Tetracycline Detection

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SSRN 2023年

作者： Liu, Ruonan Zhang, Yiyang Zuo, Hu Liu, Xiao Yang, Han Geng, Lu Wang, Wen Sheng, Weili Sun, Tieqiang Jiang, Yumei Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety Tianjin Institute of Environmental and Operational Medicine Tianjin300050 China College of Food Science and Engineering Tianjin University of Science & Technology Tianjin300457 China

Specific recognition of antibodies and efficient amplification of nucleases are powerful tools to develop responsive biosensors for monitoring human and environmental health. Herein, integrating their capabilities by site-selective modifying small molecular on DNA, an biosensor based on antibody controlling strand displacement amplification (SDA) and hybridization chain reaction (HCR) dual signal amplifications was developed, in which the SDA-HCR reaction was activated by antibody competing bind to free small molecular and small molecular-conjugated DNA. As a proof-to-concept, tetracycline (TC) was used as a target to construct a responsive biosensor and detected in various samples. First, TC was labeled with azide group through chemical modification and TC-DNA was prepared by copper-free click chemistry, then antibody controlling SDA-HCR reaction was developed after serial optimization. By this method, TC could be detected in a linear range of 0.01~100 µM with a detection limit of 0.006 µM, and the recovery of the actual samples were 96.62 - 100.31% with the RSD of 1.70 - 4.00% in real samples, showing satisfactory performance. Using this method, TC or other small molecular hazardous materials could be detected without washing, immobilization and multiple steps operation, which would simplify detection in a great degree. Consequently, the distinctive strategy proposed in this work may find more applications in the detection of other small molecules. © 2023, The Authors. All rights reserved.

关键词： DNA

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Nickel-Hydroxide Decorated Trimanganese-Tetroxide Nanorods Supported on Graphene as Bifunctional Eletrocatalyst for Metal−Air Batteries

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SSRN 2024年

作者： Xue, Yejian Wang, Yan Zheng, Zheyu Lu, Qiyang Chen, Wen Yan, Shanshan Sun, Shanshan Zhang, Houcheng Shao, Guangjie College of New Energy Ningbo University of Technology Ningbo315336 China Hebei Key Laboratory of Applied Chemistry Hebei Key Laboratory of Heavy Metal Deep Remediation in Water and Resource Reuse College of Environmental and Chemical Engineering State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Yanshan University Qinhuangdao066004 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China

Manganese oxide, such as Mn3O4, is one of promising material as eletrocatalyst in air-cathode for metal−air battery due to low cost, high catalytic activity and good stability. Although pure Mn3O4 material exhibits excellent catalytic activity to ORR, it is severely limited by its intrinsically low conductivity and high over-potential toward OER. In this work, the hybrid materials of nickel-hydroxide-decorated nanorods of trimanganese-tetroxide supported on reduced-graphene have been prepared by one-step hydrothermal method. The composite materials are used as bifunctional cathode catalysts to ORR/OER, and investigated by the technologies of rotating disk electrode and metal−air batteries. The results indicate that the hybrid material of Mn-Ni/rGO use as catalyst in air-cathode for Al/Zn−air battery has good catalytic activity. Based on analysis of scanning electron microscope and X-ray photoelectron spectroscopy, the composite material show good performance owing to the improvement of conductivity supported on graphene, more Mn4+ on the surface of hybrid material, the coexistence of Mn3+/Mn4+ redox couple, and the synergism between nickel-hydroxide and graphene. © 2024, The Authors. All rights reserved.

关键词： Graphene

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Rainfall erosivity and sediment dynamics in the Himalaya catchment during the Melamchi flood in Nepal

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Journal of Mountain science 2023年第10期20卷 2993-3009页

作者： Binod BANIYA TANG Qiu-hong Bhupati NEUPANE XU Xi-meng HE Li Tirtha Raj ADHIKARI Seyed Rashid Fallah SHAMSI Yam Prasad DHITAL Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 1oo101China Department of Environmental Science Patan Multiple CampusInstitute of Science and TechnologyTribhuvan UniversityKathmandu44613Nepal State Key Laboratory of Tibetan Plateau Earth System Environment and ResourcesInstitute of Tibetan Plateau ResearchChine se Academy of SciencesBeijing 100101China Central Department of Hydrology and Meteorology Tribhuvan UniversityKathmandu 44613Nepal College of Applied Science Tribhuvan UniversityKathmandu 44613Nepal Department of Natural Resource and Environment College of AgricultureShiraz UniversityShiraz 71345Iran College of Water Resources and Architectural Engineering Shihezi UniversityShihezi 832000China

Rainfall erosivity is an indicator of rainfall potential to cause soil *** Melamchi extreme flood occurred on June-15 and recurred on July-31,2021 in *** these flooding events,a large volume of sediments were eroded,transported and deposited due to the high rainfall erosivity of the *** this study,the temporal and the spatial distribution of rainfall erosivity within the Melamchi River Basin was estimated and further linked to sediment discharge and concentration at various sites along the river *** daily rainfall data for the event year 2021 of the entire basin were *** was performed by post-flooding grain size *** result showed that rainfall and rainfall erosivity exhibit pronounced intensity within the Melamchi River basin,particularly at Sermathang and Tarkeghang,both located in the middle section of the *** average annual rainfall in the Melamchi region was 3140.39 mm with an average annual erosivity of 18302.06(MJ mm)/(ha h yr).The average daily erosivity of the basin was 358.67(MJ mm)/(ha h)during the first event and 1241(MJ mm)/(ha h)for the second *** the upper section of sampling,the sediment size ranged from 0.1 mm to>8 mm and was poorly ***,the lower region had smaller sediment ranging from 0.075 mm to>4.75 mm and also well *** smaller size(<1 mm)sediment passing was much higher in the Chanaute(78%)and Melamchi(66.5%)river segments but the larger size(>100 mm)sediments were passed relatively higher from the Kiwil(8.20%)and Ambathan(8.39%)river *** premonsoon and monsoon seasons,the highest sediment concentration was found to be 563.8 g/L and 344.3 g/L in Bhimtar and the lowest was 238.5 g/L and 132.1 g/L at the Ambathan,*** sediment concentration during the pre-monsoon was found to be higher than the sediment concentration during the monsoon season in the Melamchi *** more erosive regions in the basin were associated with the presence of highly

关键词： Rainfall erosivity Sediment Extreme flood Melamchi Nepal

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