Mechanistic insights into the selective photocatalytic degradation of dyes over TiO_(2)/ZSM-11  

作　　者：Zhou Zhang Kai Huo Tingxuan Yan Xuwen Liu Maocong Hu Zhenhua Yao Xuguang Liu Tao Ye 

机构地区：[1]Department of Chemical Engineering,Jianghan University,Wuhan 430056,China [2]College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [3]Department of Civil and Environmental Engineering,South Dakota School of Mines and Technology,Rapid City,SD 57701,USA [4]State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第8期127-136,共10页环境科学与工程前沿（英文）

基　　金：support from the Education Department of Hubei Province through the Science and Technology Research Project(China)(B2021059).

摘　　要：Photocatalytic degradation is a promising way to eliminate dye contaminants.In this work,a series of TiO2/ZSM-11(TZ)nanocomposites were prepared using a facile solid state dispersion method.Methyl orange(MO),methylene blue(MB),and rhodamine B(RhB)were intentionally chosen as target substrates in the photocatalytic degradation reactions.Compared to pristine TiO2,negative effect was observed on MO degradation while promoted kinetics were collected on MB and RhB over TZ composites.Moreover,a much higher photocatalytic rate was interestingly achieved on RhB than MB,which indicated that a new factor has to be included other than the widely accepted electrostatic interaction mechanism to fully understand the selective photodegradation reactions.Systematic characterizations showed that TiO2 and ZSM-11 physically mixed and maintained both the whole framework and local structure without chemical interaction.The different trends observed in surface area and the photo-absorption ability of TZ composites with reaction performance further excluded both as the promotion mechanism.Instead,adsorption energies predicted by molecular dynamics simulations suggested that differences in the adsorption strength played a critical role.This work provided a deep mechanistic understanding of the selective photocatalytic degradation of dyes reactions,which helps to rationally design highly efficient photocatalysts.

关 键 词：Selective dye degradation Photocatalysis TiO2 ZSM-11 CHEMISORPTION 

分 类 号：O644.1[理学—物理化学]