Research progress of fly ash supported photocatalytic materials
Fly ash is the main solid waste of coal combustion,and its large accumulation poses a serious threat to human health and the environment.Due to the porous structure and adsorption performance of fly ash,it can play a role in dispersing and stabilizing photocatalyst,and thus significantly improve the photocatalytic activity,achieving a synergistic effect between adsorption and photocatalysis.This article provides a brief overview of the preparation methods and applications of fly ash loaded photocatalytic materials both domestically and internationally in recent years,focusing on the aggregation issue of semiconductor photocatalytic materials.Firstly,the properties and modification methods of fly ash are introduced,and the advantages and disadvantages of the preparation of fly ash photocatalytic composites by sol-gel method,hydrothermal method and liquid phase precipitation method are compared.In addition,fly ash composite photocatalyst are analyzed from the performance and the positive influence in degradation of water pollutants,NOx and VOCs gas pollutants,self-cleaning ability,and CO2 reduction,which show that fly ash mainly participates as adsorbent and carrier.However,as a carrier,fly ash has insufficient active sites,the modification technology was not mature enough,and the research was still at the laboratory scale,making it difficult to achieve large scale industrial applications.Therefore,it is necessary to improve the modification technology of fly ash,and the functional building materials with fly-ash supported photocatalytic materials will be further studied to improve their practicability.
万方数据
维普
