Synthesis Of Ag/AgVO₃/BiOCl Composite And Its Study Of Photocatalytic Performance

In the water body,there are many types of pollutants can cause water pollution,such as heavy metals,organic matter(like organic pesticides,organic dyes,etc.),electrodeless anions(such as toxic cyanide of which industrial wasterwater discharge),oil pollution substances,pathogens and others.They or stable,not easy to degrade,or toxicity strongly harmful to health,or floating on the surface to form a barrier film,endangering the water environment and biological survival.Most dye have some color,into the water will cause intuitive hazards,lowering the water transparency,affecting the photosynthesis of aquatic plants,and it is not conductive to visual beauty.Therefore,this paper focus on dye pollutants,so that the degree of photocatalytic degradation could be easily observed from the intuitive color depth.Photocatalytic technology is a technique for microscopic electron transfer activities at the interface.Energy is from sunlight.After the energy converted into chemical energy,it can be used to degrade many contaminants in environmental water.In the research of new materials,BiOCl and AgVO3 as photocatalysts have caused extensive and strong concern in the field of environmental remediation,and have made great research upsurge.Through a large number of literature and comparison,the catalytic efficiency of them is not high when they exist alone.In this paper,the monomer BiOCl and Ag/AgVO3 were modified to expand the absorption range of the solar wavelength region,and the BiOCl as vector was used to guide the separation of photoelectrons and holes.Experimental results show that this compound approach greatly improved the photocatalytic activity.In this paper,Ag/AgVO3/BiOCl composite was prepared by a simple and mild ultrasonic assisted hydrothermal method and characterized by a serie of means.The photocatalytic prosperities of the prepared composites were investigated by degradation experiments of methylene blue dyes.The mechanism of photocatalytic degradation of Ag/AgVO3/BiOCl composite was investigated by free radical inhibition experiments.In addition,the influence of the dosage of catalyst on the photocatalytic experiment was also discussed,and the reason of the formation of Ag nanoparticles and its role in the photocatalytic process were further analyzed.At last,five-cycle experiments demonstrated the good recyclability of Ag/AgVO3/BiOCl composite.Results show that novel Ag/AgVO3/BiOCl composite could be used as a highly efficient photocatalyst to degrade the waste water containing methylene blue dye contaminants under visible light condition.And the composite was innovative in structure,BiOCl showing a new flaky microsphere structure different from the traditional flaky structure.The composite of optical properties and absorption properties have also changed.BiOCl mass fraction has an optimum value of 5%,within 1 hour of visible light exposure,the degradation rate of methylene blue dye is 93.16%,which is much more higher than that of monomer BiOCl(29.24%)and monomer Ag/AgVO3(37.52%)under the same conditions.The mechanism experiment shows that superoxide radical(·O2-),hydroxyl radical(·OH)and active hole(h+)are involved in the reaction.The combination of metal oxides and semiconductors provides new ideas and new directions for the improvement of photocatalytic preparations.Ag/AgVO3/BiOCl composite will have great potential and applications in wastewater treatment.