Study On Composite And Plasma Resonance Modification Of Bismuth Chloride And Its Photocatalytic Properties

With the development of science and technology and the aggravation of industrialization,the problem of environmental pollution is more and more obvious.It has become the main cause of human health.Therefore,this paper is devoted to the study of semiconductor photocatalyst using photocatalytic technology to solve the problem of water pollution.Through the modification of semiconductors,the speed and performance of rapid degradation of organic pollutants by light irradiation are improved.The main research work in this article is listed as following:1.A simple and convenient method was used to prepare a series of Bi OI/Bi OCl films on the conductive glass FTO at room temperature and to test the photocatalytic properties of the films under visible light.After 90 min and 120 min respectively,the photocatalytic removal efficiency of 30%Bi OI/Bi OCl for Rh B and MB was over 99%.The degradation rate constant of Bi OCl is only 30%Bi OI/Bi OCl degradation rate constant 1/12.In addition,compared with Bi OI,the efficiency of 30%Bi OI/Bi OCl degradation of Rh B and MB increased by 5 times and 6 times respectively.The improvement of these properties is mainly attributed to the composite of semiconductor materials in two.On the one hand,the optical absorption range can be expanded.On the other hand,the heterojunction interface is beneficial to the rapid separation of the photoelectron hole pair,thus significantly improving the photocatalytic activity.In addition,after 5 recovery tests,the results showed that the photocatalytic activity of 30%Bi OI/Bi OCl did not decrease significantly,and it had good stability.Finally,the growth process of the composite film and the mechanism of photocatalytic degradation were studied in detail,and the degradation mechanism of the degraded pollutants was further proposed.2?A series of plasmon resonance photocatalyst Bi OCl/Bi OI-Ag films were successfully prepared and the degradation properties were tested by using organic pollutants rhodamine B as degradation products.The experimental results show that compared with Bi OCl/Bi OI,the photocatalytic activity and stability of Bi OCl/Bi OI-Ag are better than that of Bi OCl/Bi OI,whether under UV irradiation or under visible light.The increase of the activity of the Bi OCl/Bi OI-Ag photocatalyst in the plasma resonance material is mainly attributed to the surface load of Ag nanoparticles,and the Ag nanoparticles play an important role.This study shows that the mechanism of the photocatalytic action of Ag nanoparticles loaded on the Bi OCl/Bi OI surface under the light source of different wavelengths is different..Therefore,the catalytic mechanism of Ag nanoparticles is studied in detail,and the mechanism of catalytic action is proposed.At the same time,the intermediate products produced in the degradation process of Rh B were further studied in detail,and possible degradation pathways were proposed.