利用溶胶-溶剂热技术制备了锐钛矿型Yb掺杂和未掺杂TiO2纳米粒子,以亚甲基蓝(MB)溶液在紫外光和可见光照射下的光催化脱色率评价其光活性,考察了溶剂热温度、Yb掺杂量和焙烧温度对样品光活性的影响;结合XRD,BET,XPS,FT-IR,DRS和PL表征手段,探讨了Yb掺杂对TiO2光活性的影响机制.结果表明,低量Yb掺杂不仅显著提高TiO2的紫外光活性,也明显提高其可见光活性.Yb掺杂调整TiO2带隙内部电子分布状态,有效抑制光生e-/h+复合,提高量子效率;并且增加表面羟基,增大比表面积,改善表面织构特性,致使紫外光活性提高.然而Yb掺杂并未引起紫外吸收带边红移,其可见光活性的提高应归因于Yb掺杂强化了表面吸附染料的敏化作用.
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