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Coupled Cu doping and Z-scheme heterojunction for synergistically enhanced tetracycline photodegradation

Nano Research 2024年第7期17卷 5937-5948页

作者： huidong shen Chunming Yang Song Hong Leiduan Hao Liang Xu Alex W.Robertson Zhenyu Sun Country State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000China Department of Physics University of WarwickCoventry CV 47ALUK

Semiconductor-based photocatalysis by utilizing solar energy for sustainable organic pollutant elimination has been a promising tactic to alleviate environmental ***,the development of robust and efficient photocatalysts to degrade organic pollutants still faces major challenges because of insufficient charge *** we design and fabricate a heterojunction consisting of copper,carbon-modified TiO_(2),and sulfur-doped g-C_(3)N_(4)nanosheets(i.e.,S-C_(3)N_(4)/Cu/C-TiO_(2)).The heterostructure affords a remarkable synergistic photocatalysis for tetracycline hydrochloride degradation,achieving an 82.6%removal efficiency within 30 min under visible light irradiation,about 15.4 and 7.3 times higher than that of S-C_(3)N_(4)and C-TiO_(2),*** superior performance is attributed to the synergy between Cu doping and the Z-scheme heterojunction,which not only enhances the interfacial electric field effect,facilitating charge separation,but also boosts the redox *** charge carrier transfer between Cu/C-TiO_(2)and S-C_(3)N_(4)follows a Z-scheme,as verified by trapping experiments,electron spin-resonance spectroscopy,and density functional theory ***,the tetracycline hydrochloride degradation pathways are enunciated by liquid chromatograph mass spectrometry *** work provides an effective approach for constructing high-performance photocatalysts that have potential in environmental remediation.

关键词： photocatalysis Cu doping Z-scheme heterojunction electrons and holes separation tetracycline degradation

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Photocatalytic nitrogen reduction to ammonia:Insights into the role of defect engineering in photocatalysts

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Nano Research 2022年第4期15卷 2773-2809页

作者： huidong shen Mengmeng Yang Leiduan Hao Jinrui Wang Jennifer Strunk Zhenyu Sun State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Leibniz Institute for Catalysis at the University of Rostock Rostock 18059Germany

Engineering of defects in semiconductors provides an effective protocol for improving photocatalytic N_(2) conversion *** review focuses on the state-of-the-art progress in defect engineering of photocatalysts for the N_(2) reduction toward *** basic principles and mechanisms of thermal catalyzed and photon-induced N_(2) reduction are first concisely recapped,including relevant properties of the N_(2) molecule,reaction pathways,and NH3 quantification ***,defect classification,synthesis strategies,and identification techniques are compendiously *** of in situ characterization techniques for monitoring defect state during the N_(2) reduction process are also ***,various surface defect strategies and their critical roles in improving the N_(2) photoreduction performance are highlighted,including surface vacancies(i.e.,anionic vacancies and cationic vacancies),heteroatom doping(i.e.,metal element doping and nonmetal element doping),and atomically defined surface ***,future opportunities and challenges as well as perspectives on further development of defect-engineered photocatalysts for the nitrogen reduction to ammonia are *** is expected that this review can provide a profound guidance for more specialized design of defect-engineered catalysts with high activity and stability for nitrogen photochemical fixation.

关键词： photocatalysis nitrogen reduction ammonia synthesis defect engineering

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Ultrafine MoO_(x)clusters anchored on g-C_(3)N_(4)with nitrogen/oxygen dual defects for synergistic efficient O_(2)activation and tetracycline photodegradation

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Nano Research 2023年第8期16卷 10713-10723页

作者： huidong shen Xinyu Zhan Song Hong Liang Xu Chunming Yang Alex W.Robertson Leiduan Hao Feng Fu Zhenyu Sun State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000China Department of Physics University of WarwickCoventry CV 47ALUK

Photocatalytic O_(2)activation to generate reactive oxygen species is crucially important for purifying organic pollutants,yet remains a challenge due to poor adsorption of O_(2)and low efficiency of electron ***,we demonstrate that ultrafine MoO_(x)clusters anchored on graphitic carbon nitride(g-C_(3)N_(4))with dual nitrogen/oxygen defects promote the photocatalytic activation of O_(2)to generate·O_(2)−for the degradation of tetracycline hydrochloride(TCH).A range of characterization techniques and density functional theory(DFT)calculations reveal that the introduction of the nitrogen/oxygen dual defects and MoO_(x)clusters enhances the O_(2)adsorption energy from−2.77 to−2.94 *** find that MoO_(x)clusters with oxygen vacancies(Ov)and surface Ov-mediated Moδ+(3≥δ≥2)possess unpaired localized electrons,which act as electron capture centers to transfer electrons to the MoO_(x)*** electrons can then transfer to the surface adsorbed O_(2),thus promoting the photocatalytic conversion of O_(2)to·O_(2)−and,simultaneously,realizing the efficient separation of photogenerated electron–hole *** fully-optimized MoO_(x)/g-C_(3)N_(4)catalyst with dual nitrogen/oxygen defects manifests outstanding photoactivities,achieving 79%degradation efficiency toward TCH within 120 min under visible light irradiation,representing nearly 7 times higher activity than pristine g-C_(3)N_(4).Finally,based on the results of liquid chromatograph mass spectrometry and DFT calculations,the possible photocatalytic degradation pathways of TCH were proposed.

关键词： MoO_(x)clusters nitrogen/oxygen dual defects electron-hole separation O_(2)activation tetracycline photodegradation

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外场辅助光催化机理及降解有机污染物研究进展

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精细化工 2023年第6期40卷 1202-1213页

作者：周添红翟天骄王金怡沈会栋马凯张洪伟兰州交通大学环境与市政工程学院甘肃兰州730070 甘肃省黄河水环境重点实验室甘肃兰州730070

光催化技术能够利用太阳能生成自由基对有机污染物进行矿化降解,具有绿色、节能、无污染的优势,被认为是最有前景的高级氧化技术,目前研究集中于提升光催化技术的降解效率。而采用电场、超声场等外场辅助的方法能够通过提高溶液传质效... 详细信息

光催化技术能够利用太阳能生成自由基对有机污染物进行矿化降解,具有绿色、节能、无污染的优势,被认为是最有前景的高级氧化技术,目前研究集中于提升光催化技术的降解效率。而采用电场、超声场等外场辅助的方法能够通过提高溶液传质效率、抑制载流子复合、提高自由基产率等途径,进一步提高光催化效率。综述了电场、热场、微波场、超声场、磁场5种外场各自辅助光催化降解有机污染物的研究进展和应用现状,重点介绍了外场提升光催化降解效率的主要机理,归纳了每种外场辅助技术的优缺点,对其在应用中面临的问题进行总结,并对未来研究和发展方向进行了展望。

关键词：外场辅助光催化氧化污染物降解降解机理研究进展

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淡水环境中微塑料的分布及生物毒性研究进展

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给水排水 2022年第1期48卷 162-171页

作者：张国珍任豪周添红沈会栋武福平兰州交通大学环境与市政工程学院兰州730070 甘肃省黄河水环境重点实验室兰州730070

塑料污染问题已经成为影响水生生态的世界性难题,微塑料作为一种新型污染物,其对水生生态安全的影响也愈发突出。对国内淡水环境中微塑料的分布状况进行归纳总结,对其分布、来源及影响因素进行分析;同时,归纳总结微塑料对淡水生物(淡水... 详细信息

塑料污染问题已经成为影响水生生态的世界性难题,微塑料作为一种新型污染物,其对水生生态安全的影响也愈发突出。对国内淡水环境中微塑料的分布状况进行归纳总结,对其分布、来源及影响因素进行分析;同时,归纳总结微塑料对淡水生物(淡水藻类,淡水浮游动物,鱼类等)的毒害作用研究进展,讨论微塑料对淡水水生生物造成的危害,对未来微塑料的研究方向进行展望,为我国淡水环境中微塑料的污染防治提供参考。

关键词：塑料污染微塑料淡水环境淡水水生生物

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真空绝热玻璃应力理论分析及数值计算

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低温与超导 2009年第7期37卷 78-80页

作者：冯毅申惠东华南理工大学机械与汽车工程学院广州510641

对真空绝热玻璃(真空玻璃)应力进行了理论分析,用弹性力学的的结点法建立真空玻璃应力分布数学计算模型。计算结果表明,抽真空后,玻璃中的最大应力为7.381MPa,最小应力为-1.809MPa,支柱截面上的正应力为124MPa,轴向变形为0.1865μm,满... 详细信息

对真空绝热玻璃(真空玻璃)应力进行了理论分析,用弹性力学的的结点法建立真空玻璃应力分布数学计算模型。计算结果表明,抽真空后,玻璃中的最大应力为7.381MPa,最小应力为-1.809MPa,支柱截面上的正应力为124MPa,轴向变形为0.1865μm,满足抗压强度要求。

关键词：真空玻璃应力数值计算

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配电自动化系统的分析及优化设计

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现代机械 2008年第1期 83-85页

作者：沈惠东贵阳供电局花溪分局贵州贵阳550025

本文讨论了配电自动化系统的难点问题,并结合当代的技术发展趋势,对配电网系统自动化的综合优化设计问题进行了分析,力图寻求一个"性能价格比"好、能"统一规划,分步实施"、不致因系统发展或技术进步而"推倒重来"的总体系统设计。

关键词：配电自动化系统综合优化设计

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BiOBr/Bi_2MoO_6异质结的构筑及对甲基橙的吸附/光催化性能的协同作用机制

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环境科学学报 2017年第5期37卷 1751-1762页

作者：王丹军申会东郭莉王婵付峰延安大学化学与化工学院陕西省化学反应工程重点实验室延安716000

采用简单的沉积-沉淀法合成了BiOBr/Bi_2MoO_6(BOB/BMO)异质结,采用XRD、XPS、TEM、SEM、EDS、FT-IR、UV-Vis-DRS、PL、PC和EIS等测试技术对光催化剂的物相组成、形貌、光吸收特性和光电化学性能等进行系统表征,并以模型污染物甲基橙(MO... 详细信息

采用简单的沉积-沉淀法合成了BiOBr/Bi_2MoO_6(BOB/BMO)异质结,采用XRD、XPS、TEM、SEM、EDS、FT-IR、UV-Vis-DRS、PL、PC和EIS等测试技术对光催化剂的物相组成、形貌、光吸收特性和光电化学性能等进行系统表征,并以模型污染物甲基橙(MO)的吸附和光催化降解作为探针来评价BiOBr/Bi_2MoO_6异质结的吸附性能与光催化活性增强机制.SEM和TEM分析结果表明,所得Bi_2MoO_6微球由大量厚度约为20~50 nm的纳米片组成;沉淀-沉积法所得样品的形貌分析显示,尺寸约为10 nm的BiOBr量子点均匀沉积在Bi_2MoO_6微球表面,形成的新颖的BOB/BMO异质结.N2吸附/脱附结果表明,Bi_2MoO_6和BiOBr形成异质结具有大的比表面积(64.94 m2·g-1),且表面孔结构丰富.吸附/光催化降解实验结果表明,与纯Bi_2MoO_6或者BiOBr相比,BOB/BMO异质结表现出更好的吸附性能和光催化活性.吸附/光催化协同作用机理分析表明,BOB/BMO异质结具有大的比表面积和丰富的孔结构是其吸附性能增强的主要原因.此外,光致发光(PL)谱、光电流(PC)和交流阻抗(EIS)分析进一步揭示了BOB/BMO异质结有利于光生载流子的分离与转移,导致光催化活性增强,二者的协同作用使其对MO具有优越的去除性能.此外,BOB/BMO异质结较稳定,重复使用性能良好,有望用于MO废水的实际处理.

关键词：沉积-沉淀法量子点修饰 BiOBr/Bi2MoO6异质结吸附/光催化活性协同效应

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Improving the WRF/urban modeling system in China by developing a national urban dataset

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Geoscience Frontiers 2022年第4期13卷 75-88页

作者： huidong Li Fenghui Yuan Lidu shen Yage Liu Zhonghua Zheng Xu Zhou CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Lamont-Doherty Earth Observatory of Columbia University PalisadesNY 10964United States National Tibetan Plateau Data Centre Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Accurate modeling of urban climate is essential to predict potential environmental risks in *** datasets,such as urban land use and urban canopy parameters(UCPs),are key input data for urban climate models and largely affect their ***,access to reliable urban datasets is a challenge,especially in fast urbanizing *** this study,we developed a high-resolution national urban dataset in China(NUDC)for the WRF/urban modeling system and evaluated its effect on urban climate ***,an optimization method based on building morphology was proposed to classify urban land use *** key UCPs,including building height and width,street width,surface imperviousness,and anthropogenic heat flux,were calculated for both single-layer Urban Canopy Model(UCM)and multiple-layer Building Energy Parameterization(BEP).The results show that the derived morphological-based urban land use classification could better reflect the urban characteristics,compared to the socioeconomic-function-based *** UCPs varied largely in spatial within and across the *** integration of the developed urban land use and UCPs datasets significantly improved the representation of urban canopy characteristics,contributing to a more accurate modeling of near-surface air temperature,humidity,and wind in urban *** UCM performed better in the modeling of air temperature and humidity,while the BEP performed better in the modeling of wind *** newly developed NUDC can advance the study of urban climate and improve the prediction of potential urban environmental risks in China.

关键词： Urban climate modeling UCM BEP Urban land use Urban canopy parameter Chinese cities

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Comparative Study on Properties of PBAT/PBSA Film Modified by a Multi-Functional Epoxide Chain Extender or Benzoyl Peroxide

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Journal of Renewable Materials 2023年第3期11卷 1303-1319页

作者： Yanfeng Zhu huidong Shi Qing Ju Dong Zhao Yucai shen Tingwei Wang College of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China Suqian Advanced Materials Institute of Nanjing Tech University Suqian223800China

Poly(butylene adipate-co-terephthalate)(PBAT)and poly(butylene succinate-co-adipate)(PBSA)blend films were prepared with different contents of a multifunctional epoxide chain extender Joncryl ADR-4468(ADR)or benzoyl peroxide(BPO).The long-chain-branching(LCB)introduced by ADR and branched/crosslinked entanglement induced by BPO increased melt elasticity,viscosity and compatibility,as indicated by thermal properties,rheological and morphological *** was found that the elongation at break and the tensile strength were significantly improved,due to the enhancement of compatibility and the interfacial adhesion by the incorporation of ADR or *** best mechanical properties were obtained in PBAT/PBSA/ADR(60/40/0.3)(A4T6A_(0.3))and PBAT/PBSA/BPO(60/40/0.9)(A4T6B_(0.9))films,*** the rapid initiation of chain growth by BPO,it has significantly improved the transparency of the *** and BPO can be used interchangeably in improving the comprehensive properties of PBAT/PBSA films,and it would provide more strategies for developing biodegradable materials for various applications.

关键词： PBAT PBSA chain extend in-situ compatibilization

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