The Preparation Of WO₃ Based Flexible Semiconductor Photocatalyst And Its Photocatalytic Performance

Formaldehyde?HCHO?is one of the toxic gases in the room and belongs to the first class of carcinogens.Phenol is listed as a category 3 carcinogen list.Formaldehyde and phenol pollution of the environment seriously affect human health,the treatment of formaldehyde and phenol is essential.A new type of green technology photocatalysis has great application to degraded pollutants,which has the advantages of green environmental protection and low cost,but there are still difficulties such as low quantum efficiency and difficult to recover catalyst powder.For this purpose,this paper designs and manufactures a heterogeneous junction composite flexible catalytic material,with the following content:This study uses a flexible carbon cloth as a carrier,the photocatalyst tungsten trioxide?WO3?load on the carbon cloth,and a flexible and conductive photocatalyst nitrogen doping tungsten trioxide/cerium sulphide nanobeam?N-WO3/Ce2S3NBs?is formed by nitrogen doping and the load of cerium sulphide.Compared to the pure WO₃,the band gap of the N-WO₃/Ce₂S₃ NBs composite material was reduced from 2.6e V?WO₃NBs?to 1.6e V?N-WO₃/Ce₂S₃NBs?.Photocatalytic performance significantly improved: the degradation efficiency of formaldehyde in 80 min minutes was increased from 40% to 100%,and the degradation efficiency of phenols was increased from 50% to 100% within 120 min.Mineralization efficiency?TOC?of phenols within 120 min increased from 32% to 94%.The synthetic catalyst has high stability and its catalytic properties of phenol and formaldehyde are not reduced after five cycles.Synthetic photocatalysts are not only easy to recover,but also have excellent photocatalytic effect.There are three main reasons: on the one hand,synthetic photocatalyst used carbon cloth as the substrate,a flaky flexible photocatalyst is easy to recover.On the other hand,nitrogen doping increases its porosity and increases the reaction area.At the same time,the width of its band is reduced and the utilization of sunlight is enhanced.Third,Due to the large interfacial area between N-WO₃ and Ce₂S₃,the interwoven 3D carbon architecture,more importantly,the establishment of a heterojunction between N-WO₃ and Ce₂S₃,the resultant photocatalyst exhibits excellent light absorption capacity and superior ability to separate photoinduced electron–hole pairs for the photocatalytic degradation of organic compounds in air and water media.Theoretical calculations confrm that the strong electronic interaction between N-WO₃ and Ce₂S₃ can be benefcial to the enhancement of the charge carrier transfer dynamics of the as-prepared photocatalyst.To sum up,this study aims at a variety of environmental pollution problems,with formaldehyde and phenol as the target pollutants as the research object,designed an efficient flexible photocatalyst that can repair the environment,effectively overcomes the problems of low quantum efficiency of photocatalytic technology and powder-like difficulty to recover,and provides a new scheme for the development of photocatalytic technology.