采用一步水解法制备了无定形TiO2(Am-TiO2),并运用X射线衍射、X射线光电子能谱、N2吸附-脱附和紫外-可见漫反射光谱等手段对其进行了表征.结果表明,Am-TiO2具有大的比表面积(216m2/g)和丰富的表面羟基/化学吸附的水.与晶态TiO2相比,Am-TiO2的吸收带边明显蓝移(411nm→378nm),禁带宽度增加.可见光照射(λ＞420nm)下Am-TiO2样品能快速敏化降解罗丹明B(RhB),近一级反应速率常数(k=0.0325min-1)分别为锐钛矿相TiO2和商业化P25的6.5倍和5.2倍,H RhB降解以脱N-乙基和发色团开环同时进行;而晶态TiO2体系中,RhB以发色团开环为主.矿化/脱N-乙基分别是由于RhB通过-COOH或-N+Et2与催化剂表面作用所致.Am-TiO2催化剂重复使用性能良好,重复使用4次后,RhB的降解速率没有明显变化.
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