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Preparation of Bi_(2)O_(3)/BiOI Step-scheme Heterojunction Photocatalysts and Their Degradation Mechanism of Methylene Blue

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 801-806页

作者： JIANG Xuechao TAN Haiyan SHI Xinyu CHENG Xinhua hu weibing hu Xinhui Key Laboratory of Green Manufacturing of Super-light Elastomer Materials of State Ethnic Affairs Commission School of Chemistry and Environmental EngineeringHubei Minzu UniversityEnshi445000China Guangxi Key Laboratory of Chemistry and Engineering of Forest Products Guangxi University for NationalitiesNanning530006China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Bi_(2)O_(3)/BiOI step-scheme(S-scheme) heterojunction photocatalyst was synthesized by green calcination method, its degradation ability of methylene blue was investigated, and the photocatalytic performance of the Bi_(2)O_(3)/BiOI heterojunction, Bi_(2)O_(3) and BiOI was compared. The structure and morphology of the samples were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), and UV-vis diffuse reflection spectrum (UV-vis DRS). The degradation rate of methylene blue was analysised by spectrophotometry, and the calculation result showed that the degradation rate of methylene blue was 97.8% in 150 minutes. The first order kinetic rate constant of 10%Bi_(2)O_(3)/BiOI is 0.021 8 min^(-1), which are2.37 and 2.68 times of BiOI(0.009 18 min^(-1)) and Bi_(2)O_(3) (0.008 03 min^(-1)) respectively. The calculation result shows that the work function of Bi_(2)O_(3) and BiOI are 3.0 e V and 6.0 e V, respectively, by density functional theory(DFT). When this S-scheme heterojunction is used as a photocatalyst, the weaker electrons in the conduction band of BiOI will be combined with the weaker holes in the Bi_(2)O_(3) valence band under combined effect with built-in electric field and band bending, which will retain stronger photoelectrons and holes between Bi_(2)O_(3) and BiOI. This may be the internal reason for the efficient degradation of tetracycline by Bi_(2)O_(3)/BiOI S-scheme heterostructures.

关键词： step-scheme heterojunction methylene blue antibiotic wastewater treatment photocatalytic degradation charge separation

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PREPARATION,CHARACTERIZATION AND HYDROGENATION PROPERTY OF POLYMER-SUPPORTED Pd-Fe_2O_3 COMPOSITE CATALYSTS

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Journal of Wuhan University of Technology(Materials Science) 1999年第4期14卷 48-52页

作者： ZHANG Shengmin hu weibing ZHANG Manzheng Wuhan University of Technology hubei Research Institute of Chemistry Wuhan University of Technology China Sch. of Mat. Science and Engineering Wuhan University of Technology Wuhan 430070 China hubei Res. Institute of Chemistry China

A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon - carbon double bonds systems and reusability. Furthermore, XPS and IR spectra shouted that active component in the composite catalysts is atomic Pd(0). An addition of a small amount of Fe2O3 has a promotive action upon hydrogenation activity of the catalysts, which indicated that there are some strong interactions (electron transfer) between Pd(0) and Fe(Ⅲ) species. Based on these results, a possible catalytic hydrogenation mechanism was also suggested.

关键词： functional material polymet-sup- ported catalyst composite Pd - F2O3/polystyrene hydrogenation mechanism

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STRUCTURAL CHARACTERIZATION OF Pd-SnO_2/D_(3520) CATALYSTS

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Chinese Journal of Reactive Polymers 1996年第1期5卷 64-70页

作者： hu weibing Zhou Zhongxin Zhang Manzheng hubei Institute for Nationalities Enshi445000 hubei Provincial Institute of Chemistry Wuchang430074)

Distribution of metals on Pd - SnO_2/D_(3520) catalysts and state of the catalysts were studied with SEM, XRD. The interaction between metals and support or between Pd and Sn or Ph were studied by IR, XPS. In addition, the relationship of the activity for catalytic hydrogenation of the olefins and outer layer valence electron density Of Pd was discussed. The results showed that these catalysts had suitable surface state, the metals were uniformly dispersed on the surface layer of the suPPort. There were not obvious lute7uction between the metals and the suPPort. There was strong interaction between Pd and Sn (or Pb) in the catalysts. The catalytic activity for hydrogenation was related to outer layer silence electron density of Pd.

关键词： Polymer support Bimetallic catalysts Structural characterization

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STRUCTURAL CHARACTERIZATION OF Pd-SnO_2/D3520 CATALYSTS

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Chinese Journal of Reactive Polymers 1995年第1期4卷 107-112页

作者： hu weibing Zhou Zhongxin Zhang Manzheng hubei Institute for Nationalities Enshi 445000 hubei Provincial institute of Chemistry Wuchang 430074

Distribution of metals on Pd-SnO2/D3520 catalysts and state of the catalystswere studied with SEM, XRD. The interactlbn between metals and supped or between Pd and Sn or Ph were studied by IR, XPS. In addition, the relationship ofthe activity for catalytic hydrogenation of the olefins and outer layer valence electrondensity of Pd was discussed. The results showed that these catalysts had suitablesurface state, the metals were uniformly dispersed on the surface layer of the suppnd. There were not obvious interaction between the metals and the supal. Therewas strong interaction between Pd and Sn (or Ph) in the catalysts. The catalytic activity for hydrogenation was related to outer layer valence electron density of Pd.

关键词： Polymer support Bimetallic catalysts Structural characterization

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Al/Hf ratio-dependent mechanisms of microstructure and mechanical property of nearly fully dense Al—Hf reactive material

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Defence Technology（防务技术） 2024年第1期31卷 230-241页

作者： Junbao Li weibing Li Xiaoming Wang ZNDY of Ministerial Key Laboratory Nanjing University of Science and TechnologyNanjing 210094China

This study proposed three types of Al—Hf reactive materials with particle size ratios(a),which were almost completely dense(porosity of<5.40%)owing to their preparation using hot-pressing *** characteristics and phase composition were analyzed,and the influence of particle size ratios on dynamic mechanical behavior and damage mechanism were *** prepared sample with a=0.1 exhibited continuous wrapping of the Hf phase by the Al ***—Hf contact(continuous Hf phase)within the sample gradually increased with increasing a,and a small amount of fine Hf appeared for the sample with a=*** reactive materials exhibited clear strain-rate sensitivity,with flow stressσ0.05and failure strainεfincreasing approximately linearly with increasing strain rate.ε.It is found that the plastic deformation of the material increased with increasing strain *** a increased from 0.1 to 1,the flow stress gradually *** failure of the material was dominated by ductile fracture with a large Al phase plastic deformation band for lower a,while brittle fracture with crushed Hf particles occurred at higher ***,a constitutive model based on BP neural network was proposed to describe the stress-strain relationships of the materials,with an average relative error of 2.22%.

关键词： Reactive material Particle size Split Hopkinson pressure bar test Stressestrain relationship Impact failure BP neural network

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Multilayer polarization elements and their applications to polarimetric studies in vacuum ultraviolet and soft X-ray regions

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Nuclear Science and Techniques 2008年第4期19卷 193-203页

作者： WATANABE Makoto HATANO Tadashi SAITO Katsuhiko hu weibing EJIMA Takeo TSURU Toshihide TAKAHASHI Masahiko KIMURA Hiroaki HIRONO Toko WANG Zhangshan CUI Mingqi YAMAMOTO Masaki YANAGIHARA Mihiro Shanghai Dianji University Shanghai 200240 China Institute of Composite Materials Shanghai Jiaotong University China and Venture Business Laboratory Saga University Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai 980-8577 Japan Changchun Institute of Optics Fine Mechanics and Physics Changchun 130033 China Japan Synchrotron Radiation Research Institute SPring-8 Hyogo 679-5198 Japan Institute of Precision Optical Engineering Tongji University Shanghai 200092 China BSRF Institute of High Energy Physics Beijing 100049 China

Multilayer polarization elements and their applications to polarimetric studies in 20～400 eV region are mainly reviewed. General principle of selecting material combinations to get high linear polarizance multilayers of reflection type is given with practical examples,with periodic or non-periodic layer structures depending on the usage. Transmission type is introduced as linear polarizer and phase shifter. Their applications include polarization diagnosis of laboratory optical systems and synchrotron radiation beamlines of linear and circular polarization,magnetic rotation experiments such as Faraday rotation and magnetic Kerr rotation on magnetic films and multilayers,and ellipsometry to measure optical constants of thin films precisely. Polarization analysis of soft X-ray fluorescence using multilayer-coated grating is also mentioned. Finally this review is summarized with outlook of further developments.

关键词： X射线偏振色散核技术

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A NEWLY-PROPOSED TOPOLOGICAL INDEX AND ITS APPLICATION

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Journal of Wuhan University of Technology(Materials Science) 1997年第3期12卷 51-55页

作者：胡卫兵 hubei Inst for Nationalities Hubei China

This paper proposed a topological index S which combined the graph feature and chemical surroundings. It can reflect the essential properties of chemical compounds better. The capacity of distinguishing structural iso... 详细信息

关键词： topological index saturated hydrocarbons distinguishing capacity

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CC-Link在高压静电除尘效益优化中的应用

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仪器仪表学报 2005年第Z1期26卷 839-840页

作者：胡为兵李开成华中科技大学电气与电子工程学院武汉430074

静电除尘器的效率依赖于放电方法、粉尘颗粒尺寸、空气的流量、温度、粉尘的导电率等许多因数。静电除尘器的效率优化意味着以最小的功率消耗收集最多的灰尘。结合CC-Link现场总线技术以放电电流和加热器功耗作为反馈量实现整个系统的... 详细信息

静电除尘器的效率依赖于放电方法、粉尘颗粒尺寸、空气的流量、温度、粉尘的导电率等许多因数。静电除尘器的效率优化意味着以最小的功率消耗收集最多的灰尘。结合CC-Link现场总线技术以放电电流和加热器功耗作为反馈量实现整个系统的闭环控制,克服了以往高压电源放电单元和震打、收尘机构分别单独控制的缺点。

关键词：静电除尘效率优化现场总线火花率

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多速率锁相环相位同步方法的研究

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仪器仪表学报 2006年第Z2期27卷 1174-1175页

作者：胡为兵李开成华中科技大学电气与电子工程学院武汉430074

采用常规锁相环技术可以很地的实现扰动较小条件下的交流电网的实时相位同步。为了克服当电网频率出现较大的波动而且具有凹陷型扰动时常规锁相环的相位同步误差,本文提出了一种包含抗混叠滤波器的多速率锁相环方案,通过改变采样频率可... 详细信息

采用常规锁相环技术可以很地的实现扰动较小条件下的交流电网的实时相位同步。为了克服当电网频率出现较大的波动而且具有凹陷型扰动时常规锁相环的相位同步误差,本文提出了一种包含抗混叠滤波器的多速率锁相环方案,通过改变采样频率可以使抗混叠滤波器自动跟踪输入信号的频率变化,从而实现准确的相位同步。

关键词：锁相环相位同步抗混叠滤波器扰动信号

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酸雨环境下混凝土结构性能研究综述

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材料导报 2019年第11期33卷 1869-1874页

作者：曹琛郑山锁胡卫兵西安建筑科技大学土木工程学院

近年来,随着全球人口剧增、城市化进程以及现代工业化进程的加快,两大主要化石燃料能源——煤和石油的消耗量日益增加,同时煤和石油在燃烧过程中产生大量硫和氮的氧化物等,这些氧化物排放到大气中将生成二次污染物硫酸和硝酸,生成的二... 详细信息

近年来,随着全球人口剧增、城市化进程以及现代工业化进程的加快,两大主要化石燃料能源——煤和石油的消耗量日益增加,同时煤和石油在燃烧过程中产生大量硫和氮的氧化物等,这些氧化物排放到大气中将生成二次污染物硫酸和硝酸,生成的二次污染物和硝酸再遇雨、雪、雾等而形成酸雨。我国是世界上第三大酸雨区,酸雨对水生生态系统、陆生生态系统、人体健康、建筑物等均有很大的危害,给世界各国造成了巨大的经济损失,成为全球性的重大环境问题。混凝土结构因具有取材方便、可模性好、价格低廉、抗压强度高及耐火性好等优点被广泛应用,已成为我国最主要的结构形式之一。但由于混凝土材料中存在大量碱性化合物,可与酸雨发生中性化反应,导致其表面硬化水泥溶解,材料表面变质,进而引起其物理力学性能的劣化。同时,钢筋表面钝化膜由于混凝土碱性下降而发生锈蚀,锈蚀物的产生使混凝土构件膨胀,并产生裂缝,最终使混凝土结构失效。酸雨对混凝土结构耐久性的劣化影响已引起众多学者的关注。目前,国内外学者对酸雨侵蚀混凝土的研究主要集中于:(1)酸雨对水泥混凝土的腐蚀机理及劣化规律的研究;(2)酸雨侵蚀介质、pH值以及矿物掺合料的种类等对混凝土材料及构件侵蚀性能的影响;(3)不同酸雨侵蚀加速试验方法的研究,但此方面研究仍较少,尤其是结构户外暴露试验研究;(4)酸雨侵蚀混凝土结构的静态、动态力学性能的研究,这一方面的研究亦相对较少,目前国内外仍缺乏系统的研究报道。因此,为了明确酸雨对混凝土结构的侵蚀行为,本文对近30年国内外有关酸雨对混凝土耐久性影响的研究报道进行了评述,重点讨论了酸雨对混凝土结构静态及动态力学性能的影响。首先详述了酸雨对混凝土材料的腐蚀机理和劣化过程,其次总结了酸雨加速腐蚀试验方法以及酸雨对混凝土结构力学性能影响的相关研究;最后讨论了当前有关酸雨侵蚀混凝土研究的一些重要问题,并对今后需进一步研究的问题提出了建议。

关键词：酸雨混凝土结构腐蚀机理耐久性

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