| With the development of society and process of industrialization,the improvement of human living standards and large of resources have to be used up.Resources and Environment problem are two major challenges that people are facing,what are people concerned deeply about environment problem is nothing but air and water pollution.Dealing with water pollution and air pollution,the common method is photocatalytic technology,whereas the photocatalyst is the core of the photocatalytic technology.TiO2,ZnO,WO3,Fe2O3,CdS,PbS are commonly used as photocatalyst.They are half of advantages and disadvantages,for instance,the chance of recombination of electron-hole pair is to high in the photocatalyst,the light absorption efficiency is to low,the efficient reation ratio of catalyst is low.In order to compensate for the lack of various catalysts,various methods are used to modify catalyst,for example,surface treatment,supporting noble metal,metal dopant,nonmetal dopant,semiconductor composite and so on,to make catalyst with a high visible light utilization efficiency and good catalytic activity are prepared successful.The research of this paper is based on the energy band of WO3 based photocatalyst structure design and its photocatalytic performance.We do the preparation of multistage hole WO3 with the PMMA as hard template agent.Then Al reduction technology makes the multistage aperture WO3 introduced oxygen vacancy,namely to take control for the band;Moreover,Ag3PO4 are loaded in the surface of multistage hole WO3,to increase the active reaction site.The catalyst has characteristics of simple preparation,stability of safety,high photocatalytic activity.Specific content is as follows:(1)The hard template agent PMMA was made by polymerization,and then make it soaked in the ammonium tungstate solution,filtered and dried,calcined to obtain multistage hole WO3.Through the test methods such as XRD,BET on the multistage hole WO3 for morphology composition analysis,and also made the photocatalystic degradation of methylene blue under the condition of visible light.Experiments show that the multistage hole WO3 performs the good photocatalytic effect in the degradation of methylene blue solution under the visible light,but is not enough that still doesn’t meet the expected requirements,so we have to make modified for it.(2)Due to the photocatalytic activity of prepared multistage hole WO3 is not high,we want to enhance its reactivity by means of introduction of oxygen vacancy.We take the control of band for multistage hole WO3 by the way of A1 reduction.After Al reduction,the light absorption efficiency of multistage hole WO3 is obviously improved and catalytic performance is significantly increased,which reached the expected requirement.(3)Considering the high temperature reaction to the consumption of energy consumption is quite big,we want to use a more moderate way to synthesis that makes WO3 has better catalytic properties.So we use raw materials,such as AgNO3,ammonium tungstate,to synthesise Ag3PO4/WO3 by hydrothermal method.Through the test methods such as XRD,UV-Vis to characterize it.And carries on the photocatalytic degradation of methylene blue test.Experiments show that Ag3PO4 loaded on the surface of WO3 for its photocatalytic performance have improved significantly.In this paper,based on the energy band of WO3 based photocatalyst,has the high efficiency of light absorption,smaller electron hole composite risk,the higher photocatalytic activity,stable chemical properties.This photocatalyst compared with the catalyst before,with larger specific surface area,and significantly higher use of visible light.This kind of catalyst in the future water pollution governance has broad heaven and earth... |
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