稀土La掺杂SnSb复合涂层Ti基电极的制备及催化性能  

Preparation of Titanium Based SnSb Composite Coating Electrode Doped with Rare Earth Lanthanum and Its Catalytic Performance

作　　者：张翼[1] 周新新[2] 韩大匡[1] 朱友益[1] 马德胜[1] 

机构地区：[1]中国石油勘探开发研究院采收率所,北京100083 [2]大庆石油学院,黑龙江大庆163318

出　　处：《材料保护》2010年第6期9-12,共4页Materials Protection

基　　金：中国石油天然气集团公司中青年创新基金(07E1010)资助

摘　　要：稀土掺杂对电极的导电性、分解温度、析氧电位和电催化活性有较大影响。以SnCl4.5H2O,Sb2O3和La(NO3)3.6H2O为前驱体,采用溶胶-凝胶法制备了La掺杂SnSb复合涂层Ti基电极。借助SEM,XRD和EDX等检测手段对所制备电极的表面形貌、晶体结构及元素组成进行表征和分析,考察了制备电极的析氧电位及模拟苯酚废水降解效果,优化出的最优掺杂量为Sn∶Sb∶La=100.0∶10.0∶2.5(摩尔比),最佳热处理温度为550℃;用该电极处理模拟苯酚废水150min,COD去除率达到94.8%。结果表明:适量的La掺杂可提高SnO2晶粒的形核与长大速率之比,使SnSb复合电极表面晶粒细化,比表面积增大,有利于电极催化性能的改善,可为研制出适合于苯酚处理的高效阳极材料提供参考。Ti-based SnSb com-posite coating electrode doped with La was prepared via sol-gel route by using SnCl4.5H2O,Sb2O3 and La( NO3 )3.6H2O as precursors.The morphology,crystal structure and elemental com-position of the electrode were analyzed by means of scanning elec-tron microscopy,X-ray diffraction and energy dispersive spec-trometry.Besides2,the oxygen evolution potential and ability to degrade phenol in wastewater of the Ti-based electrode were de-termined.Results indicate that the optimal molar ratio of doped Sn,Sb and La in the Ti-based electrode is 100.0 :10.0:2.5,at which the electrode has the best ability to degrade phenol in wastewater.The best heat treatment temperature for the Ti-based electrode was 550℃.By using the resulting Ti-based electrode to treat phenol-containing wastewater for 150 min,the chemical oxygen demand (COD) removal rate was 94.8%.The reason lay in that La doping at an appropriate amount contributed to in-creased ratio of nucleation to growth rate of SnO2 grains,resultingin refined grains and increased specific area of SnSb compositecoating and hence improved catalytic performance of the Ti-basedelectrode.

关 键 词：SnSb复合涂层 钛基电极 溶胶-凝胶法 镧 掺杂 催化性能 

分 类 号：TG174[金属学及工艺—金属表面处理]