Study On The Conttrollable Preparation,Regulation And Photodatalytic Perfformance Of Zinc Oxide

As one of the most important semiconductors,zinc oxide(ZnO)has been widely used in solar cells,photocatalysis,environmental remediation and so on.Rhodamine B and tetracycline hydrochloride are more pollutants in the environment.They are widely used in textile,leather,paint,medicine and veterinary fields.Excessive use will harm the environment and human health.Using ZnO to eliminate environmental pollutants can effectively prevent environmental pollution.Doping and morphology control of ZnO can significantly improve its photocatalytic performance.In this paper,we prepared ZnO with porous structure by calcination using ZIF-8 as precursor.The photocatalytic performance of ZnO was further improved by metal oxide doping and element doping.The specific research contents are as follows.1.ZnO doped with a series of different concentrations of Cu2O was used as the precursor of zeolites imidazolium ester framework material ZIF-8 to study its photocatalytic activity.It was found that ZnO doped with a certain amount of Cu2O exhibited a higher TC degradation rate(83.6%)after exposure to visible light(λ>420 nm)for 75 minutes.Rhodamine B can be completely degraded in 65 minutes under all light.In order to study the reasons for the improvement,we characterized the materials by SEM,TEM,XPS,XRD and EIS.It was found that compared with pure ZnO,Cu2O doped ZnO introduced p-n heterojunction and increased oxygen vacancies,thus reducing the band gap and electron hole recombination.Thus,the photocatalytic efficiency is improved.2.The morphology of ZIF-8 precursor was controlled by doping Ni to improve its photocatalytic efficiency.We can control the morphology of ZIF-8 by doping Ni directly into ZIF-8 precursor,and then obtain ZnO doped with different proportions of Ni by calcination.This material can obtain more thorough photocatalytic degradation efficiency,which can completely degrade rhodamine B in 100 minutes.In order to study the reason for the improvement,we characterized the material by SEM,TEM and EIS.It was found that compared with ZnO,the introduction of Ni into ZnO can regulate the morphology of the sample,expand its specific surface area,and obtain more efficient photocatalytic performance.