利用溶胶-水热法制备了未掺杂、N掺杂、Gd掺杂和Gd-N共掺杂TiO2纳米光催化剂,以甲基橙(MO)溶液在紫外光和可见光照射下的光催化脱色评价其光活性；采用XRD、XPS、BET、UV-Vis和PL分析技术表征样品的物理化学性能,探讨Gd-N共掺杂对TiO2光活性的影响机制.结果表明,Gd掺杂能有效抑制光生e-/h+的复合,提高光量子效率；抑制TiO2晶粒生长,改善样品表面织构特性,明显提高紫外光活性.N掺杂窄化TiO2带隙,拓宽光吸收范围至可见光区,从而提高了可见光活性.Gd-N共掺杂进一步窄化带隙增加可见光吸收,减小晶粒尺寸,改善样品的表面织构特性,增强织构的热稳定性.与单掺杂样品相比,Gd-N-TiO2在可见光照射下对MO的光催化脱色活性进一步提高,这归因于Gd-N共掺杂的协同效应.
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