新型AgI/Ag/BiOBr光催化剂的构建及其增强的可见光催化活性  

A Novel Visible-Light-Driven AgI/Ag/BiOBr Photocatalyst with Enhanced Photocatalytic Performance

作　　者：曹冬冬 贾雪梅 姜珊 林海莉[1] 曹静[1] CAO Dongdong;JIA Xuemei;JIANG Shan;LIN Haili;CAO Jing(School of Chemistry and Material Science,Huaibei Normal University,235000,Huaibei,Anhui,China)

机构地区：[1]淮北师范大学化学与材料科学学院,安徽淮北235000

出　　处：《淮北师范大学学报（自然科学版）》2022年第3期36-44,共9页Journal of Huaibei Normal University：Natural Sciences

基　　金：国家自然科学基金项目(21902056);安徽省自然科学基金项目(1908085MB36);安徽省高校自然科学研究项目(KJ2021A0522,KJ2020ZD007,gxbjZD2021096)。

摘　　要：通过在光催化的过程中光还原二元AgI/BiOBr复合物原位合成一种新型的三元AgI/Ag/BiOBr复合物.在可见光条件下(λ>420 nm),AgI/Ag/BiOBr光催化剂对偶氮染料甲基橙(MO)和无色苯酚的降解呈现出优异的降解效率分别高达94.8%和86.2%.光催化活性的增强主要归因于金属Ag在Z型AgI/Ag/BiOBr光催化剂充当电子迁移桥,不仅降低界面电子迁移阻力,而且加速光生载流子的分离和迁移.本研究不仅证明Ag作为电荷传输桥的应用,而且为设计和制备高效、稳定的光催化剂提供一条新的途径.To improve separation efficiency of the photogenerated electron-hole pairs,constructing a Z-scheme heterojunction using Ag as charge transport bridge is considered to be a promising strategy.A novel AgI/Ag/BiOBr Zscheme system was prepared via deposition-precipitation means assisted by the photo-reduction process.The as-obtained AgI/BiOBr composites with the optimized ratio of Ag/Bi at 0.6 exhibited superior visible-light photocatalytic performance for azo dye methyl orange(MO)and colorless phenol degradation and removal rate reaches 94.8%and86.2%,respectively.The enhanced performance of AgI/BiOBr heterojunction may be attributed to the fact that the Ag serves as a charge transport bridge in the Z-scheme system to accelerate the separation and migration of the photogenerated carriers.This work not only demonstrates the application of Ag as charge transport bridge but also provides a new way to design and prepare high-efficiency and stable photocatalysts.

关 键 词：Z-scheme 银纳米颗料 助催化剂 光催化 

分 类 号：O614[理学—无机化学]