采用溶胶-凝胶法制备了SiO2/TiO2粉体并采用XRD、TG-DTA及Uv-vis对其结构进行了表征.采用热沉积法将其负载于玻璃板上,以水中天然有机物腐殖酸和典型菌种大肠杆菌为代表物考察了SiO2/TiO2薄膜的光催化活性,并对其机理进行了推测.研究结果表明,SiO2/TiO2薄膜具有较高的光催化活性及抑菌作用.硅的引入不仅使催化剂的带隙变宽,提高了催化剂表面上光生e-h+的氧化还原能力,而且使催化剂表面出现了更多有利于光生空穴-电子转变为·OH的吸附氧,这是SiO2/TiO2薄膜使水中污染物降解及细菌灭活的主要原因.
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