络合-电沉积法制备TiO_2纳米管负载Ag光催化剂  

Preparation of Ag-Loaded TiO_2 Nanotube Photocatalyst by Complexation-Electrodeposition

作　　者：周蕾[1] 孙永利[1] 郑兴灿[1] 李鹏峰[1] 

机构地区：[1]中国市政工程华北设计研究总院有限公司国家城市给水排水工程技术研究中心,天津300074

出　　处：《化工环保》2015年第3期308-311,共4页Environmental Protection of Chemical Industry

基　　金：国家水体污染控制与治理科技重大专项(2013ZX 07314002;2014ZX07305001)

摘　　要：采用柠檬酸钠作为络合剂,通过络合-电沉积法制备了TiO2纳米管负载Ag光催化剂(Ag/TiO2NTs),通过FE-SEM和XRD等手段对Ag/TiO2NTs进行了表征。以偶氮染料甲基橙(MO)为目标降解物,考察了不同制备条件对Ag/TiO2NTs光催化性能的影响。表征结果显示,柠檬酸钠可以有效调控Ag+的电化学还原过程,实现Ag纳米颗粒在TiO2纳米管表面的均匀负载。实验结果表明:以在n(柠檬酸钠)∶n(Ag NO3)=1、电流密度为0.4 m A/cm2、煅烧温度为500℃的条件下制得的Ag/TiO2NTs作为光催化剂(Ag负载量为1.97%(x)),处理初始质量浓度为20 mg/L、初始溶液p H为9的MO溶液,光催化反应120 min后MO去除率为86.53%;经过6次的重复使用,Ag/TiO2NTs催化剂光催化降解MO的去除率基本稳定在80%以上。The Ag-loaded TiO2 nanotube photocatalyst （Ag/TiO2NTs） was prepared by complexation-electrodeposition method using sodium citrate as complexing agent,and was characterized by FE-SEM and XRD.The effects of various preparation conditions on the photocatalytic activity of Ag/TiO2NTs were studied using the azo dye methyl orange （MO） as degradation target.The characterization results show that sodium citrate can effectively control the Ag＋ electrochemical reduction process and help the Ag nanoparticles evenly distribute on the surface of TiO2 nanotubes.The experimental results show that：After the MO solution with 20 mg/L of initial mass concentration and 9 of initial solution pH has treated for 120 min using the Ag/TiO2NTs （1.97％ （x） of Ag loading） prepared under the conditions of n （sodium citrate） ∶ n （AgNO3）=1,current density 0.4 mA/cm2 and calcination temperature 500 ℃ as photocatalyst,the MO removal rate is 86.53％;The MO removal rates are mainly above 80％ after 6 times of the Ag/TiO2NTs reuse.

关 键 词：络合剂 电化学沉积 银纳米颗粒 二氧化钛纳米管 光催化 染料降解 

分 类 号：X703.1[环境科学与工程—环境工程]