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Promotional catalytic activity and reaction mechanism of Ag-modified Ce_(0.6)Zr_(0.4)O_(2) catalyst for catalytic oxidation of ammonia

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Journal of environmental sciences 2023年第2期124卷 491-504页

作者： Xiaolong Tang Yuanyuan Zhang Yaru Lei Yuanyuan Liu Honghong Yi Fengyu Gao School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

Ce1-xZrxO_(2) composite oxides(molar,x=0-1.0,interval of 0.2)were prepared by a cetyltrimethylammonium bromide-assisted precipitation *** enhancement of silver-species modification and catalytic mechanism of adsorption-transformationdesorption process were investigated over the Ag-impregnated catalysts for lowtemperature selective catalytic oxidation of ammonia(NH_(3)-SCO).The optimal 5 wt.%Ag/Ce_(0.6)Zr_(0.4)O_(2) catalyst presented good NH_(3)-SCO performancewith>90% NH_(3) conversion at temperature(T)≥250°C and 89% N_(2) *** the irregular block shape and underdeveloped specific surface area(∼60m2/g),the naked and Ag-modified Ce_(0.6)Zr_(0.4)O_(2) solid solution still obtained highly dispersed distribution of surface elements analyzed by scanning electron microscope-energy dispersive spectrometer(SEM-EDS)(mapping),N_(2) adsorptiondesorption test and X-ray diffraction(XRD).H2 temperature programmed reduction(H2-TPR)and X-ray photoelectron spectroscopy(XPS)results indicated that Ag-modification enhanced the mobility and activation of oxygen-species leading to a promotion on CeO_(2) reducibility and synergistic Ag0/Ag+and Ce^(4+)/Ce^(3+)redox ***,Ag+/Ag_(2)O clusters could facilitate the formation of surface oxygen vacancies that was beneficial to the adsorption and activation of ***3-temperature programmed desorption(NH_(3)-TPD)showed more adsorption-desorption capacity to ammoniawere provided by physical,weakandmedium-strong acid *** reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments revealed the activation of ammonia might be the control step of NH3-SCO procedure,during which NH3 dehydrogenation derived from NHx-species and also internal selective catalytic reduction(i-SCR)reactions were proposed.

关键词： Ag/Ce_(0.6)Zr_(0.4)O_(2)catalyst Synergistic interaction Catalytic oxidation of ammonia NH3 dehydrogenation Internal selective catalytic reduction

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An insight on the mechanism of efficient leaching of vanadium from vanadium shale induced by microwave-generated hot spots

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 293-302页

作者： Sheng Li Yimin Zhang Yizhong Yuan Pengcheng Hu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Collaborative Innovation Center of Strategic Vanadium Resources Utilization Wuhan 430081China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan 430081China School of Resource and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

Microwave heating can rapidly and uniformly raise the temperature and accelerate the reaction *** this paper,microwave heating was used to improve the acid leaching,and the mechanism was investigated via microscopic morphology analysis and numerical simulation by COMSOL Multiphysics *** effects of the microwave power,leaching temperature,CaF_(2) dosage,H_(2)SO_(4) concentration,and leaching time on the vanadium recovery were investigated.A vanadium recovery of 80.66%is obtained at a microwave power of 550 W,leaching temperature of 95℃,CaF_(2) dosage of 5wt%,H_(2)SO_(4) concentration of 20vol%,and leaching time of 2.5 *** with conventional leaching technology,the vanadium recovery increases by 6.18%,and the leaching time shortens by 79.17%.More obvious pulverization of shale particles and delamination of mica minerals happen in the microwave-assisted leaching *** simulation results show that the temperature of vanadium shales increases with an increase in electric field(E-field).The distributions of E-field and temperature among vanadium shale particles are relatively uniform,except for the higher content at the contact position of the *** analysis results of scaleup experiments and leaching experiments indicate high-temperature hot spots in the process of microwave-assisted leaching,and the local high temperature destroys the mineral structure and accelerates the reaction rate.

关键词： vanadium shale microwave-assisted leaching hot spots numerical simulation

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Establishment of compound database of emerging antioxidants and high-resolution mass spectrometry screening in lake sediment from Taihu Lake Basin, China

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environmental science and Pollution Research 2024年第19期31卷 28341-28352页

作者： Su, Huijun Li, Jianhua Ye, Langjie Su, Guanyong Key Laboratory of Environmental Remediation and Ecological Health Ministry of Industry and Information Technology School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization Yulin Engineering Research Center of Coal Chemical Wastewater School of Chemistry and Chemical Engineering Yulin University Yulin719000 China

Antioxidants are ubiquitous in various environmental samples, leading to increasing concern regarding their potential risk to environments or humans. However, there is dearth of information regarding the environmental fate of antioxidants and unknown/unexpected antioxidants in the environment. Here, we established a compound database (CDB) containing 320 current-used antioxidants by collecting the chemicals from EPA’s functional use database and published documents. Physical–chemical characteristics of these antioxidants were estimated, and 19 ones were considered as persistent and bioaccumulative (P&B) substances. This CDB was further coupled with high resolution mass spectrometry (HRMS) technique, which was employed for suspect screening of antioxidants in extracts of sediments (n = 88) collected from Taihu Lake basin. We screened 119 HRMS features that can match 135 chemical formulas in the CDB, and 20 out of them exhibited the detection frequencies ≥ 90%. The total concentrations of suspect antioxidants in sediments ranged from 6.41 to 830 ng/g dw. Statistical analysis demonstrated that concentrations of suspect antioxidants in Taihu Lake were statistically significantly lower than those in Shihu and Jiulihu Lake, but greater than those from other small lakes. Collectively, this study provided a CDB that could be helpful for further monitoring studies of antioxidant in the environments, and also provided the first evidence regarding the ubiquity of antioxidants in aquatic environment of Taihu Lake basin. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Antioxidants

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Bioleaching and biosorption behavior of vanadium-bearing stone coal by Bacillus mucilaginosus

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 283-292页

作者： Yingbo Dong Shijia Chong Hai Lin School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

The recovery of vanadium(V)from stone coal by bioleaching is a promising *** bioleaching experiments and the biosorption experiments were carried out,aiming to explore the adsorption characteristics of Bacillus mucilaginosus(***)on the surface of vanadium-bearing stone coal,and the related mechanisms have been *** bioleaching at 30℃ for 28 d,the cumulative leaching rate of V reached 60.2%.The biosorption of *** on stone coal was affected by many *** the pH value of leaching system is 5.0,strong electrostatic attraction between bacteria and stone coal promoted *** in the logarithmic growth phase had mature and excellent biosorption *** initial bacterial concentration of 3.5×10^(8) CFU/mL was conducive to adhesion,with 38.9%adsorption rate and 3.6×10^(7) CFU/g adsorption *** adsorption of *** on the stone coal conformed to the Freundlich model and the pseudo-second-order kinetic *** surface carried functional groups(-CH_(2),-CH_(3),-NH_(2),etc.),which were highly correlated with the adsorption *** addition,biosorption changed the surface properties of stone coal,resulting in the isoelectric point(IEP)approaching the *** results could provide an effective reference for the adsorption laws of bacteria on minerals.

关键词： Bacillus mucilaginosus vanadium-bearing stone coal bioleaching biosorption

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Efficient and eco-friendly carbon dioxide capture with metal phosphate catalysts in monoethanolamine solutions

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Chinese Journal of Chemical engineering 2024年第11期75卷 121-130页

作者： Chunjin Zhang Xue Yao Linlin Chen Hua Tang Siming Chen School of Environmental Science and Engineering Carbon Neutrality and Eco-Environmental Technology Innovation Center of QingdaoQingdao UniversityQingdao 266075China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China Carbon Neutralization Institute China University of Mining and TechnologyXuzhou 221008China School of Chemical Engineering China University of Mining and TechnologyXuzhou 221008China

Catalytic carbon dioxide(CO_(2))desorption has emerged as a promising approach to enhance the efficiency of CO_(2)capture while minimizing energy demands,crucial for advancing chemical absorption *** study investigates the catalytic potential of three metal phosphates(aluminium phosphate(AlPO4),cobaltous phosphate(Co_(3)(PO_(4))_(2)),and zinc phosphate(Zn_(3)(PO_(4))_(2)))in improving the MEA(monoethanolamine)-based CO_(2)absorption-desorption *** the catalysts tested,AlPO_(4)demonstrated superior performance,enhancing CO_(2)absorption capacity by 4.2%to 9.3%and desorption capacity by 12.3%to 22.7%across five ***,AlPO_(4)increased the CO_(2)desorption rate by over 104.4%at a desorption temperature of 81.3℃,simultaneously reducing the required sensible heat by 12.3%to 22.7%,compared to processes without *** improved efficiency is attributed to AlPO_(4)'s ability to effectively transfer hydrogen protons from protonated MEA to carbamate,thereby facilitating the decomposition of carbamate and regenerating CO_(2).This research introduces a viable,cost-effective,and eco-friendly solid acid catalyst strategy for CO_(2)desorption,contributing to the development of more energy-efficient CO_(2)capture technologies.

关键词： CO_(2) CO_(2) capture Catalytic desorption Energy reduction Metal phosphate Stability

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Enhanced structural stability and durability in lithium-rich manganese-based oxide via surface double-coupling engineering

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Journal of Energy Chemistry 2024年第11期98卷 274-283页

作者： Jiayu Zhao Yuefeng Su Jinyang Dong Xi Wang Yun Lu Ning Li Qing Huang Jianan Hao Yujia Wu Bin Zhang Qiongqiong Qi Feng Wu Lai Chen School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401120China Yibin Libode New Materials Co. Ltd.Yibin 64400SichuanChina Initial Energy Science&Technology(Xiamen)Co. LtdXiamen 361000FujianChina

Lithium-rich manganese-based oxides(LRMOs) exhibit high theoretical energy densities, making them a prominent class of cathode materials for lithium-ion batteries. However, the performance of these layered cathodes often declines because of capacity fading during cycling. This decline is primarily attributed to anisotropic lattice strain and oxygen release from cathode surfaces. Given notable structural transformations, complex redox reactions, and detrimental interface side reactions in LRMOs, the development of a single modification approach that addresses bulk and surface issues is challenging. Therefore,this study introduces a surface double-coupling engineering strategy that mitigates bulk strain and reduces surface side reactions. The internal spinel-like phase coating layer, featuring threedimensional(3D) lithium-ion diffusion channels, effectively blocks oxygen release from the cathode surface and mitigates lattice strain. In addition, the external Li_(3)PO_(4) coating layer, noted for its superior corrosion resistance, enhances the interfacial lithium transport and inhibits the dissolution of surface transition metals. Notably, the spinel phase, as excellent interlayer, securely anchors Li_(3)PO_(4) to the bulk lattice and suppresses oxygen release from lattices. Consequently, these modifications considerably boost structural stability and durability, achieving an impressive capacity retention of 83.4% and a minimal voltage decay of 1.49 m V per cycle after 150 cycles at 1 C. These findings provide crucial mechanistic insights into the role of surface modifications and guide the development of high-capacity cathodes with enhanced cyclability.

关键词： Lithium-ion battery Layered lithium-rich cathode Surface double-coupling engineering Lattice strain Oxygen release

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Imide-based covalent organic framework with excellent cyclability as an anode material for lithium-ion battery

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Chinese Chemical Letters 2024年第6期35卷 206-210页

作者： Yue Qian Zhoujia Liu Haixin Song Ruize Yin Hanni Yang Siyang Li Weiwei Xiong Saisai Yuan Junhao Zhang Huan Pang School of Environmental&Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemistry&Chemical Engineering Yangzhou UniversityYangzhou 225009China Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China

Covalent organic frameworks(COFs)exhibiting reversible redox behaviors have been identified as promising candidates for constructing electrode materials in lithium-ion batteries(LIBs).However,their extensive application has been limited due to finite redox sites and poor structural *** this study,we design and synthesize a novel polyimide covalent organic framework(PI-COF)using the traditional solvothermal method and successfully apply it as an anode material for *** large conjugated structure of PI-COF accelerates charge transfer,while its large surface area provides more active sites,making PI-COF an attractive anode material for ***,the PI-COF anode material demonstrates high reversible specific capacity and excellent long-term cycling stability due to its COF ***,the PI-COF electrodes deliver a specific capacity of 800 m Ah/g at a current density of 200 m A/g after 200 cycles,while a specific capacity of 450 m Ah/g at a current density of 1000 m A/g is sustained after 800 *** outstanding lithium storage capacity,particularly the satisfactory long-term cycling stability,establishes PI-COF as a promising material for LIBs.

关键词： Ethylenediaminetetraacetic dianhydride Covalent organic frameworks Polyimide Lithium-ion battery Anode material

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In vitro degradation and multi-antibacterial mechanisms ofβ-cyclodextrin@curcumin embodied Mg(OH)_(2)/MAO coating on AZ31 magnesium alloy

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Journal of Materials science & technology 2023年第1期132卷 179-192页

作者： Kui Xue Pei-Hong Tan Ze-Hui Zhao Lan-Yue Cui M Bobby Kannan Shuo-Qi Li Cheng-Bao Liu Yu-Hong Zou Fen Zhang Zhuo-Yuan Chen Rong-Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Engineering The University of NewcastleCallaghanNSW 2308Australia College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

It is a challenging task to prepare a coating on Mg alloys for desirable corrosion resistance,good antibac-terial ability and *** this research work,an in-situ Mg(OH)_(2)coating incorporated with sodium alginate(SA)andβ-cyclodextrin(β-CD)@curcumin(Cur)was formed on the surface of micro arc oxidation(MAO)coated AZ31 alloy via a low temperature hydrothermal *** tech-niques such as X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectrometer(FT-IR)and scanning electron microscope(SEM)were employed to characterize the chemi-cal composition and surface morphology of the *** corrosion protection ability of the coatings was monitored via electrochemical polarization,hydrogen evolution and immersion *** antibacterial ability and cytocompatibility of the coatings were evaluated by plate counting method under the irradiation of 808 nm-near infrared light,in vitro cytotoxicity tests(MTT)and live/dead cell *** results indicate that a chelation of the organic molecules led to the formation of a MAO/(β-CD@Cur)-SA-Mg(OH)_(2)coating with excellent corrosion protection,multi-antibacterial ability and almost no toxic-ity to the ***,the coating provided photothermal performance through the light absorption of Cur,which was encapsulated byβ-CD to improve its *** enhanced the binding force between the drug and the *** novel coating designated the potential application on bioab-sorbable magnesium alloys.

关键词： Magnesium alloys Photothermal ability Antibacterial coating Corrosion Biomaterials

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Efficient reduction and adsorption of Cr(Ⅵ)using FeCl_(3)-modified biochar:Synergistic roles of persistent free radicals and Fe(Ⅱ)

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Journal of environmental sciences 2024年第3期137卷 626-638页

作者： Shujie Hu Chengshuai Liu Hongling Bu Manjia Chen Ying-heng Fei National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of ScienceGuiyang 550081China School of Environment Science and Engineering Guangzhou UniversityGuangzhou 510006China College of Resources and Environment Chongqing SchoolUniversity of Chinese Academy of SciencesChongqing 400714China School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou 510006China

Transition metal iron and persistent free radicals(PFRs)both affect the redox properties of biochar,but the electron transfer relationship between them and the coupling reduction mechanism of Cr(Ⅵ)requires further *** untangle the interplay between iron and PFRs in biochar and the infuences on redox properties,FeCl_(3)-modified rice husk biochar(FBCs)was prepared and its reduction mechanism for Cr(Ⅵ)without light was *** FBCs had higher surface positive charges,oxygen-containing functional groups,and PFRs compared with pristine rice husk biochar(BC).Phenoxyl PFRs with high electrondonating capability formed in *** pronounced electron paramagnetic resonance signals showed that the PFRs preferred to form at lower Fe(Ⅲ)*** a high concentration of Fe(Ⅲ)would be reduced to Fe(Ⅱ)and consumed the formed *** kinetics and X-ray photoelectron spectroscopy analysis indicated that the FBCs effectively enhanced the Cr(Ⅵ)removal efficiency by 1.54-8.20 fold and the Cr(Ⅵ)reduction efficiency by 1.88-9.29 fold compared to those of *** quenching and competitive reductant addition experiments revealed that the higher Cr(Ⅵ)reduction performance of FBCs was mainly attributed to the formed PFRs,which could contribute to~74.0%of Cr(Ⅵ)reduction by direct or indirect electron *** PFRs on FBCs surfaces could promote the Fe(Ⅲ)/Fe(Ⅱ)cycle through single electron transfer and synergistically accelerate~52.3%of Cr(Ⅵ)*** study provides an improved understanding of the reduction mechanism of iron-modified biochar PFRs on Cr(Ⅵ)in environments.

关键词： Biochar Iron-modification Cr(Ⅵ) Electron transfer Reduction mechanism

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A wood pulp sponge cleaning wipe as a high-performance bioanode material in microbial electrochemical systems for its vast biomass carrying capacity,large capacitance,and small charge transfer resistance

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Journal of Materials science & technology 2024年第14期181卷 1-10页

作者： Pinpin Yang Yaqian Gao Weihua He Jingkun An Jia Liu Nan Li Yujie Feng School of Environmental Science and Engineering Academy of Ecology and EnvironmentTianjin University300072 TianjinChina State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Microbial electrochemical systems are a promising green and sustainable technology that can transform waste into *** conversion efficiency and lowering system costs,particularly for elec-trodes,are the primary directions that promote practical *** sponges made from wood pulp have been industrially mass-produced in various application scenarios due to their porosity and green *** this study,the three-dimensional(3D)porous cellulose sponges carbon(CSC)was obtained by directly carbonizing cellulose sponges at different temperatures(600,700,800,900,1000,and 1100℃).It has been successfully used as a high-performance anode in microbial fuel cells(MFCs).The carbonization temperature significantly impacted the materials’specific surface area,con-ductivity,and *** greater the anode material’s carbonization temperature,the lower the charge transfer resistance and the higher the maximum power density(CSC-1100,4.1±0.1 W m^(-2)).The CSC-700's maximum power density(3.62±0.11 W m^(-2))was the highest power density reported to date among lignocellulose-based anodes with relatively low energy *** pleated multilayer porous surface promotes microbial adhesion and can build thicker biofilms with the highest biomass of 2661±117μg cm^(-2)(CSC-1100)and containing 86%electrogenic bacteria(Geobacter).To investigate the effect of conducting polymers on the material’s surface,we introduced polyaniline and *** found that the CSC-1000/PPy bioanodes produced a maximum power density(4.18±0.05 W m^(-2)),slightly higher than of without polypyrrole-modified(CSC-1000,3.99±0.06 W m^(-2)),indicating that the CSCs anode surface had excellent electron transfer efficiency and could achieve the same amount of energy as the polypyrrole *** study introduced a promising method for fabricating high-performance anodes using low-cost,industrialized,and sustainable materials.

关键词： Polyaniline Polypyrrol Capacitance anode Electrogenic biofilms Extracellular electron transfer

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