以胱氨酸为掺杂剂,利用溶胶-凝胶法直接制备了N、S共掺杂改性的光催化剂TiO2-N-S,借助XRD、XPS和SPS等手段对其进行了表征,并以苯酚为模型污染物考察了其在模拟太阳光下的催化活性.XRD分析表明该光催化剂为锐钛矿晶型,N、S共掺杂能有效抑制TiO2晶粒的生长,提高了晶相间转变温度.XPS显示S是以S6+形式存在的,其掺杂方式是置换了晶格金属Ti4+形成阳离子S6+;N的峰形结构呈现宽化状态,形成了O-Ti-N和Ti-N-O键,且表面羟基含量显著提高.SPS研究结果表明,该催化剂的可见光吸收增强,吸收带边发生明显"红移".模拟太阳光下降解苯酚的实验结果表明,该光催化剂在120min内对苯酚的降解率可高达79.3%.
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