采用浸渍-焙烧法制备了具有可见光响应活性的硅藻土/g-C3N4复合光催化材料.利用TG、XRD、FE-SEM、HR-TEM、FT-IR、XPS、UV-Vis-DRS和PL谱等手段对其物相组成、形貌和光吸收特性进行表征.以RhB的光催化降解为探针反应评价催化剂的活性.光催化结果表明,2.32wt％硅藻土/g-C3N4复合材料对RhB有较高的催化活性,光催化降解的速率常数是纯g-C3N4的1.9倍.自由基捕获实验表明,·O2-是RhB在硅藻土/g-C3N4复合材料上光催化降解的主要活性物种.光催化活性提高的主要原因在于硅藻土和g-C3N4之间静电作用有利于光生电子-空穴在g-C3N4表面的迁移,进而提高g-C3N4的光催化活性.
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