Preparation Of Activated Carbon-based Ozone Catalytic Oxidation Catalyst

With the constant development of social economy in our country this big background,the industrial production scale is growing,more and more industrial wastewater emissions by reckless,such behavior led to the end result is the water become very bad,so development of efficient treatment of industrial wastewater advanced oxidation technology has been the focus of people long-term research.Traditional advanced oxidation methods have many limitations in the actual industrial treatment process,such as the need to adjust the pH of wastewater,the dosage of reagents,or the secondary pollution of sludge.In recent years,the ozone catalytic oxidation technology has received widespread attention in the industry due to its mild reaction conditions,simple and efficient operation,and no secondary pollution.This article has studied in detail the preparation of the catalyst and the optimization of reaction conditions in this technology.In this article,three types of catalysts,La-Ce/AC,Ce-Zr/AC,and La-Y/AC,were prepared using activated carbon particles as the carrier,transition metals such as Zr,La,Ce,Y,and rare earth metals as composite active components.In the experiment,methylene blue solution prepared was used as simulated wastewater.By changing the impregnation method,impregnation time,calcination time,calcination temperature and active component type,the influence of preparation conditions on the catalyst was investigated.Finally,it is concluded that the best preparation conditions for the above three types of catalysts are all immersion in an equal volume impregnation method for 12 h,the roasting time is 3 h,and the roasting temperature is 500℃.On this basis,the loading amount of active components is continuously optimized,and the ratio of the loading amount when the catalyst performance is optimal is:La-Ce/AC(4 wt.%:1 wt.%)、Ce-Zr/AC(4 wt.%:1 wt.%)、La-Y/AC(2 wt.%:2 wt.%)。During the experiment,using methylene blue as a simulated wastewater,the system investigated the effects of different reaction conditions such as space velocity and ozone dosage on the ozone catalytic oxidation reaction system.The most economical reaction conditions can be selected based on the actual emission standards of the factory.At the same time,organics with different molecular structures were used as simulated wastewater to investigate the treatment effects of different types of catalysts on different types of organics.ICP was used to determine the actual loading of active metal elements and the dissolution of supported metals,and XRD was used to qualitatively characterize the catalyst.The excellent performance of the catalyst was tested continuously for one month.After repeated use,the catalyst still maintains high catalytic activity,high stability and service life,and has a good development prospect in industrial applications.