溶胶-凝胶法制备稀土Gd掺杂SnO_2电催化电极的实验研究  

Study on preparing DSA by sol-gel method of rare earth Gd doping SnO_2

作　　者：王静[1,2] 冯玉杰[3] 

机构地区：[1]黑龙江科技学院资源与环境工程学院 [2]哈尔滨工业大学市政环境工程学院,哈尔滨150001 [3]哈尔滨工业大学市政环境工程学院

出　　处：《环境污染治理技术与设备》2005年第7期19-24,共6页Techniques and Equipment for Environmental Pollution Control

基　　金：国家自然科学基金资助项目(50278022)

摘　　要：本实验采用溶胶凝胶法,以无机盐SnCl4·5H2O、Sb2O3、Gd(NO3)3为前驱体,制备稀土(Gd)掺杂Sn、Sb溶胶,以钛电极为基材利用该溶胶制备稀土(Gd)掺杂SnO2涂层电极。优化了溶胶凝胶法制备稀土Gd掺杂SnO2涂层电极的实验条件,研究了在不同加水量、柠檬酸量、pH值等条件下所制备的电极以苯酚为目标有机物的电化学降解特性,对所获得的电极进行了TOC测试及SEM、XRD和XPS等表征,分析并讨论了稀土掺杂对SnO2电极性能的影响机理。结果表明,溶胶凝胶法制备稀土掺杂SnO2涂层电极是可行的,稀土Gd的掺杂有利于SnO2电极电催化性能的提高,而且不同的加水量、柠檬酸量、pH值对电极性能有一定的影响。本实验条件下,加水量(水与前驱体总量摩尔比)R为36、柠檬酸加入量(柠檬酸与前驱体总量之摩尔比)N为1.0、溶胶pH值为2时所制备的电极降解效果最好,电极最稳定。所获得的电极为纳米涂层电极,其表面涂层中SnO2、Gd2O3等催化活性物质的含量均较高,对苯酚的降解有较好的效果。The electrodes of Gd doping SnO2 were prepared with sol-gel method, in which process SnCl4 ·5H2O,Sb2O3 ,Gd（NO3）3 were chosen as precursors. The main factors which might influence the properties of DSA electrodes, such as the quantity of water, citric acid and pH value of the sol were studied. Taking phenol as model substrate, the electrochemical characteristics of above electrodes were evaluated. On the condition of our experiment, it shows that the amount of mol between water and the total metals is 36, between citric acid and the total metals is 1.0, and the pH of the sol is 2. TOC, UV scan, SEM, XRD and XPS etc were selected to study the structure variation of SnO2 after Gd doping. The mechanism was also discussed. Results showed that Gd doping can help to enhance the electrocatalytic characteristics of SnO2 electrods and the size of SnO2 crystal particle prepared with sol-gel method is owing to nanometer-size, this is benefit to the improvement of the DSA electrocatalytic ability.

关 键 词：溶胶-凝胶 稀土 涂层电极 掺杂 降解 

分 类 号：X131.2[环境科学与工程—环境科学]