Sm^(3+)掺杂方式对TiO_2晶相及光催化性能影响的研究  

Study on the influence of the addition method for Sm^(3+) on the crystalline phase of TiO_2 and the photocatalytic activity of TiO_2

作　　者：胡霞[1] 吴维成 阎松[1] 张静[1] 

机构地区：[1]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001 [2]辽宁中科纳米材料发展有限公司,辽宁抚顺113001

出　　处：《应用化工》2016年第9期1633-1637,1641,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(21573101);教育部留学回国科研启动基金项目(教外司留[2013]1792号);辽宁省自然科学基金项目(2014020107);辽宁省高等学校优秀人才支持计划项目(LJQ2014041);中国科学院北京理化所光化学转换与功能材料重点实验室开放课题

摘　　要：采用共沉淀法和浸渍法分别制备了Sm^(3+)掺杂(Sm-TiO_2)和负载(Sm/TiO_2)的TiO_2光催化剂。通过XRD、TEM等对经过800℃高温焙烧的Sm-TiO_2和Sm/TiO_2样品的晶相、形貌和粒子大小进行了考察。结果表明,与共沉淀法相比,采用浸渍法时,Sm^(3+)的负载可以更有效地抑制TiO_2从锐钛矿到金红石的相变及TiO_2粒子的长大。这可能主要是因为采用浸渍法时Sm^(3+)更容易分散在TiO_2的表面上,阻挡了锐钛矿粒子之间的接触以及金红石在锐钛矿界面上的生成,从而抑制了TiO_2的相变及粒子长大。以光催化降解罗丹明B为模型反应,考察了Sm^(3+)掺杂和负载的TiO_2光催化材料的性能。结果表明,经过高温焙烧之后,Sm-TiO_2和Sm/TiO_2样品的光催化活性均远远高于TiO_2的光催化活性。而且Sm/TiO_2具有更高的光催化性能。The Sm^3＋modified TiO2 was synthesized using two methods of co-precipitation（ Sm-TiO2） and wet impregnation（ Sm / TiO2）. The crystalline phase,morphology and the particle size of Sm-TiO2 and Sm / TiO2 calcined at 800 ℃ were investigated by using X-ray diffraction（ XRD） and TEM. Compared with coprecipitation method,it is observed that the phase transformation from antase to rutile and the growth of the particle size of TiO2 can be effectively inhibited even after calcination at 800 ℃ when the impregnation method was used. Compared with co-precipation method,Sm^3＋may be more enriched in the surface of the Sm / TiO2 sample for the impregnation method,and the direct contact of anatase particles of TiO2 is avoided. As a consequence,the phase transition and the growth of the particle size for TiO2 can be effectively inhibited by Sm^3＋. Rhodamine B was selected as a representative organic substance to evaluate the photocatalytic activity of Sm-TiO2 and Sm / TiO2 calcined at 800 ℃. It is observed that Sm-TiO2 and Sm / TiO2 exhibited enhanced photocatalytic degradation of Rh B than TiO2 after calcination at high temperature. Moreover,it is found that Sm / TiO2 showed the higher photocatalytic activity than Sm-TiO2.

关 键 词：氧化钐 氧化钛 晶相 光催化 罗丹明B 

分 类 号：TQ032[化学工程] TQ034