Preparation And Photocatalytic Properties Oflanthanum,Manganese Doped Nano-sized BiOCL/diatomite Composites

With the rapid development of science and technology,people all over the world are demanding more and more work and living environment.The high pursuit of indoor environment comfort makes formaldehyde pollution caused by indoor decoration become a problem that can not be ignored.Indoor air purification has been put on the agenda.However,the photocatalytic technology of nanometer BiOCl/diatomite based interior wall coating is very promising in the field of indoor formaldehyde removal,especially in the field of environmental purification.The application of nanometer BiOCl/diatomite based interior wall coating in formaldehyde removal is a very environmentally friendly technology.BiOCl composite photocatalytic materials were prepared by ion doping and loading method.The mechanism of BiOCl composite photocatalysis was further discussed,which laid a theoretical foundation for the wide application of BiOCl.In this study,using diatomite as carrier,BiCl₃ as precursor,nanometer BiOCl films were loaded by hydrolysis precipitation method.The initial concentration of bismuth and pH value of reaction solution were investigated.The effects of reaction temperature and calcination temperature on the morphology and crystal phase composition of BiOCl particles were investigated.The influence mechanism of the synthesized BiOCl thin films was analyzed by modern detection methods such as TEM,TG-DTA,XPS,FT-IR,XRD and BET,and the optimum loading process was studied.The results show that under the conditions of diatomite pore size of 50⁸00nm,initial concentration of bismuth 0.05mol/L,concentration of[SO₄]^2-0.025mol/L,HCl added 2.1 m L,hydrolysis temperature 20?,calcination temperature 650?,and holding time of 3 hours,the surface of diatomite can be uniformly loaded with nanometer Bi OCl particles.Taking formaldehyde as the target degradation material.The structure and properties of the composite were further improved by single factor experiment,the removal rate of formaldehyde was increased,and the catalytic activity of the composite under ultraviolet light was improved.Due to the low utilization of visible light and the low photocatalytic degradation efficiency of BiOCl,lanthanum was prepared by ion doping method in this study.Manganese doped nanosized BiOCl/diatomite composite.The degradation rate of formaldehyde in the composite was characterized by modern detection methods,such as FT-IR?XRD?BET?UV-VIS,etc.The results show that the optimum doping amount of lanthanum and manganese is 1.0 and 0.8 respectively.When the initial concentration of formaldehyde in the 1m³ chamber is 1.625mg/m³,the lanthanum and manganese doped nano-sized BiOCl/diatomite composites are put in.The results show that the three composite materials have good application effect in formaldehyde removal,among which manganese doping is the best,and the removal rate can reach 96.35%.