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Gd3+和Zn2+共掺杂二氧化钛介孔粉末的制备及光催化性能

DOI: 10.14062/j.issn.0454-5648.2015.11.18

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Abstract:

采用溶胶?凝胶法制备了Gd3+和Zn2+共掺杂TiO2粉末。研究了Gd3+和Zn2+掺杂对样品的相组成、表面形貌和光催化活性的影响;以亚甲基蓝为目标降解物评价了其光催化活性。结果表明制备的样品为锐钛矿相并具有良好的介孔结构。Gd3+和Zn2+在抑制光生电子与空穴的复合起到不同的作用,Gd3+起到光生电子陷阱的作用,Zn2+可以在起到光生空穴陷阱的作用,Gd3+和Zn2+共同作用可以显著降低电子和空穴的复合速率,进而增大TiO2的光催化活性。当Gd3+的掺杂量为0.5%、Zn2+的掺杂量为0.3%时,TiO2粉末的光催化活性最高,经过40min光催化降解亚甲基蓝溶液,降解率达到99.5%,比单掺杂0.5%Gd3+的TiO2粉末降解率提高了11.5%,比单掺杂0.3%Zn2+的TiO2粉末降解率提高了9.3%。

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