BiVO_(4)-TiO_(2)光催化剂的超声辅助合成及其可见光性能  

BiVO_(4)-TiO_(2) Synthesized by Ultrasound Assisted Mixing for Photocatalytic Oxidation under Visible Light

作　　者：钱震 童熙 安国芳 黄琼[2] 李一岑 李楠旺 QIAN Zhen;TONG Xi;AN Guo-fang;HUANG Qiong;LI Yi-cen;LI Nan-wang(Jiangsu Environmental Protection Group Nantong Co.,Ltd.,Nantong 226000,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies,Jiangsu Key Laboratory of Atmospheric Environmental Monitoring&Pollution Control,School of Environmental Science&Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]江苏省环保集团南通有限公司,江苏南通226000 [2]江苏省大气环境与装备技术协同创新中心,江苏省大气环境监测与污染控制高技术研究实验室,南京信息工程大学环境科学与工程学院,江苏南京210044

出　　处：《分子催化（中英文）》2024年第6期567-577,I0004,I0005,共13页Journal of Molecular Catalysis(China)

基　　金：江苏省自然科学基金资助项目(BK20201389,BK20190786,BK20170954);国家自然科学基金资助项目(21501097,51902166);江苏省高等学校“青蓝工程”和江苏省高等学校重点学科建设项目(PAPD)。

摘　　要：光催化氧化技术已被广泛应用于气态污染物催化降解,被普遍认为是一种高效降解室内低浓度甲醛污染的治理技术.TiO_(2)是应用最广泛的一种光催化剂,具有强氧化能力、低成本、无毒等优点,但存在仅能被紫外光激发的缺点;BiVO_(4)具有适宜的带隙和多样化的晶体结构,可提升催化剂的可见光反应活性.引入4种表面活性剂构建BiVO_(4)/TiO_(2)异质结结构,研究考察表面活性剂种类、掺入量及混合方法等对BiVO_(4)-TiO_(2)可见光催化氧化甲醛性能的影响,应用XRD、BET、PL、UV-Vis、XPS等分析表征技术对催化剂微观结构及性能进行表征分析.研究结果表明,以NaOH为表面活性剂,采用超声辅助混合所制的BiVO_(4)-TiO_(2)催化剂性能最佳,其48 h甲醛去除率高达97.1%,且稳定性良好,这均归结于高比表面积、丰富的孔径分布以及BiVO_(4)与TiO_(2)间所形成异质结结构,提升光生载流子的分离,降低光生电子和空穴的复合速率.Photocatalytic oxidation technology is widely used for the catalytic degradation of gaseous pollutants and recognized as an effective treatment technology for low concentration indoor formaldehyde pollution.TiO_(2),which has strong oxidation capacity,low cost and non-toxic advantages,is the most widely used photocatalyst but can only be excited by ultraviolet light.BiVO_(4) has a suitable band gap energy and diversified crystal structure,which can improve the reactivity of the catalyst in visible light.In this study,four kinds of surfactants were introduced to BiVO_(4) and TiO_(2) for constructing the heterojunction structure,and the effects of surfactant type,incorporation,and mixing method on the formaldehyde oxidation of BiVO_(4)-TiO_(2) were investigated.XRD,BET,PL,UV-Vis and XPS techniques were used to analyze the microstructure and performance of the catalyst.The results showed that the BiVO_(4)-TiO_(2) catalyst prepared with NaOH as a surfactant exhibited the best performance.The 48 h formaldehyde removal rate reached 97.1%,indicating good stability.This was attributed to its high specific surface area,rich pore size distribution and heterojunction structure formed between BiVO_(4) and TiO_(2) that improved carrier separation efficiency while reducing electron-hole recombination rates.

关 键 词：光催化氧化 异质结催化剂 甲醛 二氧化钛 钒酸铋 

分 类 号：O643.32[理学—物理化学]