Study For Preparation And Photocatalytic Performance Of Multi-level Structure BiOCl

In these years,energy shortage and environmental pollution become two challenges in human society.Photocatalytic technology can convert low-density solar energy into high-density electrical or chemical energy,the presence of catalyst can direct solution of organic pollutants in water or air by the sun.,and photolysis water to prepare hydrogen.So photocatalytic technology has broad application prospects in environmental purification and clean energy development.The key problem of photocatalysis is the preparation of photocatalyst.At present,it is found that the photocatalytic activity is mainly composed of metal sulfides and metal oxides.In order to expand the range of light response of photocatalyst furtherly for Improving the photocatalytic efficiency of sunlight furtherly,the development of a new type of highly active and highly efficient photocatalytic materials has become an important direction in the field of photocatalysis.Among them,because of the unique layered structure and internal electric field of bismuth metal oxide material,they can effectively realize the separation of photogenerated electron vacancies,so they have excellent photocatalytic performance.Beacause of the suitable band gap,BiOCl was concerned in the field of photocatalysis.In addition,the microstructure,especial size,the three-dimensional structure,the surface morphology,the crystal surface ratio and the pore channel of the photocatalyst have great influence on the catalytic performance of the catalyst.This paper is devoted to the synthesis and characterization of novel BiOCl at room temperature and the study of UV degradation of organic pollutants.Controll the morphology and structure of BiOCl by using different process parameters and synthesis methods,the formation mechanism and the effect of microstructure on the photocatalytic activity were studied.Therefore,the research topic of this paper is of great significance in China The main research work of this paper is as follows:1.At room temperature,regulator of pH with ammonia and dilute nitric acid,Bi(NO3)3 as the source of Bi,soluble chloride as the source of Cl-,synthetize multilevel structure BiOCl by the Control of different soft templates.Characterize the morphology of powders by SEM,analyze the phase structure by XRD,measur the degradation behavior of rhodamine B under different experimental conditions by UVVIS spectrophotometer.Results show,in this paper,the powders synthesized by different processes are single phase BiOCl,The morphology of the samples was strongly dependent on the type of chloride,the type of soft template and the pH value etc.The synthesized materials can effectively be used for the mineralization of rhodamine B under UV irradiation.2.Under microwave assisted conditions,control the PH by dilute nitric acid,Bi(NO3)3 as the source of Bi,Mg Cl2 as the source of Cl-,with the control of PEG2000,it synthetize well crystallized and 3D hierarchical structure BiOCl in short time.Characterize the morphology of powders by SEM,analyze the phase structure by XRD,the discuss the formation mechanism.Under UV irradiation,the photocatalytic activity of the synthesized material was studied by using rhodamine B as a target to simulate the degradation products.Results show,BiOCl has good photocatalytic activity,the photocatalytic activity of BiOCl firstly increases and then decreases with the increase of concentration,The degradation efficiency of 1g/L was the highest,at the same time,the degradation ability was closely related to pH value,the lower the pH value,the higher the degradation efficiency.The BiOCl material synthesized by the above two processes can be easily recovered,after repeated use,its structure and performance are basically unchanged,which has good practical value.