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环境化学  2015 

碘铈共掺杂纳米TiO2的制备及可见光光催化性能

Keywords: 碘铈共掺杂,TiO2,制备,可见光光催化

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Abstract:

采用溶胶凝胶法制备了不同原料比例碘铈共掺杂纳米TiO2催化剂,运用X射线光电子能谱(XPS),X射线衍射(XRD),透射电镜(TEM)等检测手段对催化剂进行了初步表征.结果表明,经过450℃煅烧处理得到的TiO2、铈掺杂TiO2以及碘铈共掺杂TiO2催化剂均为锐钛矿相,掺杂的Ce和I原子可能以I—Ce—O及O—Ti—I等键合方式进入TiO2晶格内部,此外,I-Ce离子共掺杂能有效降低TiO2表面的电子-空穴对的复合.以染料罗丹明B(RhodamineB,RhB)和无色小分子水杨酸(Salicylicacid,SA)为降解的目标化合物,发现碘铈共掺杂的最佳物质的量之比为nCe∶nI∶nTi=0.04∶0.05∶1,即I0.05Ce0.04TiO2催化剂在可见光照射下(λ>420nm)降解目标化合物其光化学活性明显优于单掺铈的TiO2催化剂和未掺杂的TiO2.该催化反应涉及到空穴氧化,并伴有羟基自由基(·OH)、超氧自由基(O2·-)及H2O2等氧化物种的产生.

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