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Coupling of BiOCl Ultrathin Nanosheets with Carbon Quantum Dots for Enhanced Photocatalytic Performance

Transactions of Tianjin University 2024年第3期30卷 211-220页

作者： Pin Song Xiaoyu Fang wei Jiang Yuyang Cao Daobin Liu shiqiang wei Jun Du Lang Sun Lei Zhao Song Liu Yuzhu Zhou Jun Di Chade Lv Bijun Tang Jiefu Yang Tingting Kong Yujie Xiong Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Engineering Research Center of Carbon NeutralityCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230029China School of Chemistry and Chemical Engineering National Special Superfi ne Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science&Engineering Nanyang Technological UniversitySingapore 639798Singapore

Over the past few decades,photocatalysis technology has received extensive attention because of its potential to mitigate or solve energy and environmental pollution *** novel materials with outstanding photocatalytic activities has become a research hotspot in this *** this study,we prepared a series of photocatalysts in which BiOCl nanosheets were modified with carbon quantum dots(CQDs)to form CQDs/BiOCl composites by using a simple solvothermal *** photocatalytic performance of the resulting CQDs/BiOCl composite photocatalysts was assessed by rhodamine B and tetracycline degradation under visible-light *** with bare BiOCl,the photocatalytic activity of the CQDs/BiOCl composites was significantly enhanced,and the 5 wt%CQDs/BiOCl composite exhibited the highest photocatalytic activity with a degradation efficiency of 94.5%after 30 min of ***,photocatalytic N_(2)reduction performance was significantly improved after introducing *** 5 wt%CQDs/BiOCl composite displayed the highest photocatalytic N_(2)reduction performance to yield NH_3(346.25μmol/(g h)),which is significantly higher than those of 3 wt%CQDs/BiOCl(256.04μmol/(g h)),7 wt%CQDs/BiOCl(254.07μmol/(g h)),and bare BiOCl(240.19μmol/(g h)).Our systematic characterizations revealed that the key role of CQDs in improving photocatalytic performance is due to their increased light harvesting capacity,remarkable electron transfer ability,and higher photocatalytic activity sites.

关键词： Carbon quantum dots BiOCl Rhodamine B Tetracycline Photocatalysis

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基于ECM-ISC模型的“互联网+政务服务”平台公众持续使用意愿研究

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科技创业月刊 2024年第8期37卷 117-124页

作者：黄杰魏诗强海南大学国际旅游与公共管理学院海南海口571155

随着数字政府的持续建设,“互联网+政务服务”改革成为优化营商环境和提升政务服务质量的突破口。基于ECM-ISC模型,从“顾客”视角出发探索“互联网+政务服务”平台公众持续使用意愿的决定因素。结果显示:期望确认显著正向影响感知有用... 详细信息

随着数字政府的持续建设,“互联网+政务服务”改革成为优化营商环境和提升政务服务质量的突破口。基于ECM-ISC模型,从“顾客”视角出发探索“互联网+政务服务”平台公众持续使用意愿的决定因素。结果显示:期望确认显著正向影响感知有用性;期望确认显著正向影响满意度;感知有用性显著正向影响公众持续使用意愿;满意度显著正向影响公众持续使用意愿。研究可为数字政府建设及海南省政府数字化转型提供一定参考。

关键词：互联网+政务服务持续使用意愿 ECM-ISC模型

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“互联网+政务服务”体验影响机理研究——基于系统建构及用户价值感知视角

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海南热带海洋学院学报 2024年第4期31卷 87-98页

作者：黄杰魏诗强方铭海南大学国际旅游与公共管理学院海口570228 海南开放大学海口学院海口570208

“互联网+政务服务”改革是提升政务服务质量,优化营商环境的突破口。通过以系统建构视角以及价值感知视角切入讨论“互联网+政务服务”用户体验影响机理,得出信息质量、系统质量、服务质量、感知成本、感知收益等因素显著影响“互联网... 详细信息

“互联网+政务服务”改革是提升政务服务质量,优化营商环境的突破口。通过以系统建构视角以及价值感知视角切入讨论“互联网+政务服务”用户体验影响机理,得出信息质量、系统质量、服务质量、感知成本、感知收益等因素显著影响“互联网+政务服务”体验的结果。据此提出以优化系统建构质量为抓手,提升感知价值为根基增强用户“互联网+政务服务”体验的建议,助力数字政府建设。

关键词： “互联网+政务服务” 体验 VAM模型 D&M模型

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Characteristics of isothermal adsorption and desorption of aluminum ion to/from humic acids

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Journal of Environmental Sciences 2008年第5期20卷 579-584页

作者： WANG Qiang wei shiqiang HUANG Yuming ZHANG Jinzhong College of Resources and Environment Southwest University Chongqing 400716 China Chongqing Key Laboratory of Agricultural Resources and Environment Chongqing 400716 China College of Chemistry and Chemical Engineering of Southwest University Chongqing 400715 China

The adsorption and desorption characteristics of Al^3＋ to/from humic acids at different pH, ionic strength, and temperature were studied by the C-25 glucosan-gel chromatography method. The results showed that the maximum adsorption amount （Qmax） and adsorption constant （k） increased, whereas, the absolute value of standard thermodynamic molar free energy change （ΔGm^0） decreased with the increase of pH at constant ionic strength and temperature. With ionic strength increasing from 0 to 0.15 mol/L, Qmax, and k increased and the absolute value of ΔGm^0 decreased at constant pH and temperature. High temperature was unfavorable for the adsorption reaction, as indicated by the dramatic decrease of Qmax and the absolute value of ΔGm^0 with an increase in temperature. The standard thermodynamic molar free energy change （ΔGm^0） and the standard thermodynamic enthalpy change （ΔHm^0） of the adsorption reaction were both negative, suggesting that adsorption reaction was spontaneous and exothermic. The desorption rate of HA-Al^3＋ complex accelerated with the decrease of pH, and a significant linear relationship could be obtained between pH and the desorption rates of Al^3＋ from humic acids. These results demonstrated that the Al^3＋ adsorption reaction was a ＂biphase＂ reaction, and adsorption occurred at both the interior and exterior adsorption sites of humic acids.

关键词： adsorption and desorption characteristics Al^3+ humic acid

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Absence of hexavalent chromium in marine carbonates:implications for chromium isotopes as paleoenvironment proxy

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National Science Review 2021年第3期8卷 151-158页

作者： Ziyao Fang Liping Qin wei Liu Tao Yao Xiaoyan Chen shiqiang wei CAS Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of China CAS Center for Excellence in Comparative Planetology National Synchrotron Radiation Laboratory University of Science and Technology of China

The oxygenation of Earth’s atmosphere is widely regarded to have played an important role in early-life ***(Cr) isotopes recorded in sedimentary rocks have been used to constrain the atmospheric oxygen level(AOL) over geological times based on the fact that a positive Cr isotopic signature is linked to the presence of Cr(Ⅵ) as a result of oxidative continental ***,there is no direct evidence of the presence of Cr(Ⅵ) in sedimentary rocks *** are most widely distributed over geological times and were thought to have incorporated Cr(Ⅵ) directly from ***,we present results of Cr valence states in carbonates which show Cr(Ⅲ) is the dominant species in all samples spanning a wide range of geological *** findings indicate that Cr(Ⅵ) in seawater was reduced either before or after carbonate precipitation,which might have caused Cr isotopic fractionation between seawater and carbonates,or marine carbonates preferentially uptake Cr(Ⅲ) from *** Cr(Ⅲ) can come from non-redox Cr cycling,which also can cause isotopic fractionation,we suggest that positively fractionated Cr isotopic values do not necessarily correspond to the rise in AOL.

关键词： Cr isotopes XANES speciation atmospheric oxygen level

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Relating Cd2+binding by humic acids to molecular weight:A modeling and spectroscopic study

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Journal of Environmental Sciences 2018年第8期30卷 154-165页

作者： Hongcheng Bai Zhenmao Jiang Minjin He Biying Ye shiqiang wei College of Resources and Environment Department of Environment Science and EngineeringSouthwest UniversityChongqing 400715China Chongqing Key Laboratory of Agricultural Resources and Environment Chongqing 400715China China Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment Ministry of EducationChongqing 400715China

Molecular weight（Mw） is a fundamental property of humic acids（HAs）, which considerably affect the mobility and speciation of heavy metals in the environment. In this study, soil humic acid（HA） extracted from Jinyun Mountain, Chongqing was ultra-filtered into four fractions according to the molecular weight, and their properties were *** of cadmium was investigated by titration experiments. For the first time,Langmuir and non-ideal competitive adsorption-Donna（NICA-Donnan） models combined with fluorescence excitation-emission matrix（EEM） quenching were employed to elucidate the binding characteristics of individual Mw fractions of HA. The results showed that the concentration of acidic functional groups decreased with increasing Mw, especially the phenolic groups. The humification degree and aliphaticity increased with increasing Mw as indicated by elemental composition analysis and FT-IR spectra. The binding capacity of Cd2＋ to Mw fractions of HA followed the order UF1（〈 5 kDa）〉 UF2（5–10 kDa）〉 UF4（〉 30 kDa）〉 UF3（10–30 kDa）. Moreover, the distribution of cadmium speciation indicated that the phenolic groups were responsible for the variations in binding of Cd2＋ among different Mw fractions. The results of fluorescence quenching illustrated that the binding capacity of Cd2＋ to Mw fractions was controlled by the content of functional groups, while the binding affinity was largely influenced by structural factors. The results provide a better understanding of the roles that different HA Mw fractions play in heavy metal binding,which has important implications in the control of heavy metal migration and bio-toxicity.

关键词： Humic acid Molecular weight NICA-Donnan Fluorescence excitation-emission matrix quenching Cadmium

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Preliminary investigation of phosphorus adsorption onto two types of iron oxide-organic matter complexes

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Journal of Environmental Sciences 2016年第4期28卷 152-162页

作者： Jinlong Yan Tao Jiang Ying Yao Song Lu Qilei Wang shiqiang wei Key Laboratory of Eco-environments in Three Gorges Reservoir Region Ministry of EducationChongqing Key Laboratory of Agricultural Resources and EnvironmentCollege of Resources and EnvironmentDepartment of Environmental Science and EngineeringSouthwest University Department of Forest Ecology and Management Swedish University of Agricultural Sciences School of Material Science & Engineering Beijing Institute of Technology

Iron oxide（FeO）coated by natural organic matter（NOM）is *** associations of minerals with organic matter（OM）significantly changes their surface properties and reactivity,and thus affect the environmental fate of pollutants,including nutrients（e.g.,phosphorus（P））.In this study,ferrihydrite/goethite-humic acid（FH/GE–HA）complexes were prepared and their adsorption characteristics on P at various p H and ionic strength were *** results indicated that the Fe O–OM complexes showed a decreased P adsorption capacity in comparison with bare Fe *** maximum adsorption capacity（Q（max））decreased in the order of FH（22.17 mg/g）〉FH-HA（5.43 mg/g）〉GE（4.67 mg/g）〉GE-HA（3.27 mg/g）.After coating with HA,the amorphous FH–HA complex still showed higher P adsorption than the crystalline GE–HA *** decreased P adsorption observed might be attributed to changes of the Fe O surface charges caused by OM *** dependence of P adsorption on the specific surface area of adsorbents suggests that the Fe O component in the complexes is still the main contributor for the adsorption *** P adsorptions on Fe O–HA complexes decreased with increasing initial p H or decreasing initial ionic strength.A strong dependence of P adsorption on ionic strength and p H may demonstrate that outer-sphere complexes between the OM component on the surface and P possibly coexist with inner-sphere surface complexes between the Fe O component and ***,previous over-emphasis on the contributions of original minerals to P immobilization possibly over-estimates the P loading capacity of soils,especially in humic-rich areas.

关键词： Phosphorus Ferrihydrite–humic acid complex Goethite–humic acid complex Adsorption

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Structural studies on the disorder system of liquid gallium

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Chinese Science Bulletin 1998年第5期43卷 396-398页

作者： shiqiang wei Wenhan Liu Tiandou Hu Yuren Wang Kunquan Lu Univ Sci & Technol China Hefei Natl Sunchrotron Radiat Lab Ctr Fundamental Phys Hefei 230026 Peoples R China Beijing Natl Sunchrotron Radiat Lab Beijing 100039 Peoples R China Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

Studies the structures and properties of liquid materials quantitatively. X-ray absorption fine structure (XAFS) as a tool used to probe the local structure of disordered systems such as liquid materials; Factors attr... 详细信息

关键词： liquid Ga XAFS disorder system.

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Microbial electrosynthesis of acetate from CO_(2)under hypersaline conditions

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Environmental Science and Ecotechnology 2023年第1期13卷 86-95页

作者： Xiaoting Zhang Tyler Arbour Daijun Zhang shiqiang wei Korneel Rabaey College of Resources and Environment Southwest UniversityChongqing400715China Center for Microbial Ecology and Technology(CMET) Ghent UniversityCoupure Links 6539000GhentBelgium State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China Center for Advanced Process Technology for Urban Resource Recovery(CAPTURE) Frieda Saeysstraat 19052GhentBelgium

Microbial electrosynthesis(MES)enables the bioproduction of multicarbon compounds from CO_(2)using electricity as the *** high salinity can improve the energetic performance of bioelectrochemical systems,acetogenic processes under elevated salinity are poorly *** MES under 35e60 g L^(-1)salinity was *** production in two-chamber MES systems at 35 g L^(-1)salinity(seawater composition)gradually decreased within 60 days,both under-1.2 V cathode potential(***/AgCl)and^(-1).56 A m^(-2)reductive *** precipitation on cathodes(mostly CaCO3)likely declined the production through inhibiting CO_(2)supply,the direct electrode contact for acetogens and H2 *** decreasing Ca2t and Mg2t levels in three-chamber reactors,acetate was stably produced over 137 days along with a low cathode apparent resistance at 1.9±0.6 mU m^(2)and an average production rate at 3.80±0.21 g m^(-2)d^(-1).Increasing the salinity step-wise from 35 to 60 g L^(-1)gave the most efficient acetate production at 40 g L^(-1)salinity with average rates of acetate production and CO_(2)consumption at 4.56±3.09 and 7.02±4.75 g m^(-2)d^(-1),*** instantaneous coulombic efficiency for VFA averaged 55.1±31.4%.Acetate production dropped at higher salinity likely due to the inhibited CO_(2)dissolution and acetogenic *** up to 78%was enriched on cathodes as the main acetogen at 35 g L^(-1).Under high-salinity selection,96.5%Acetobacterium dominated on the cathode along with 34.0%Sphaerochaeta in *** research provides a first proof of concept that MES starting from CO_(2)reduction can be achieved at elevated salinity.

关键词： Carbon capture and utilization High salinity Carbonate precipitates Acetogenesis Marine bacteria

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Cation-intercalated engineering and X-ray absorption spectroscopic characterizations of two dimensional MXenes

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Chinese Chemical Letters 2020年第4期31卷 969-979页

作者： Changda Wang shiqiang wei Pengjun Zhang Kefu Zhu Pin Song Shuangming Chen Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China

The geometrically multiplied development of 2D MXenes has already promoted the prosperity of various fields of scientific researches especially but not limited in energy storage and ***,cation intercalation can improve the interlayer spacing of MXenes resulting in tunable physical and chemical ***,the synchrotron radiation X-ray characterizations have also shown high potential on exploring the property and structu re of cation intercalated MXe *** review is mainly focused on the recent achievements of cation intercalated MXenes through different methods on energy storage ***-based X-ray absorption spectroscopic characterizations are emphasized to probe the local coordination and electronic structure in intercalated *** outlook of cation intercalation on MXenes and their applications are also discus sed.

关键词： 2D materials MXenes Cation intercalation XAFS Energy storage

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