用改性溶胶-凝胶法合成了活性炭负载纳米TiO2光催化剂粉末,通过X射线衍射(XRD)、拉曼光谱(Raman)、透射电子显微镜(TEM)等研究光催化剂的晶体结构和表面形貌.不同气氛下煅烧对TiO2的晶体转变的影响研究表明:氮气下TiO2晶体转变温度明显低于空气下晶体转变温度,但是活性炭负载量对晶体结构的影响不大.光催化活性实验表明:活性炭负载纳米TiO2光催化剂对亚甲基蓝的降解作用要优于纯TiO2的降解作用.不同气氛下煅烧实验研究发现,在低于400℃时,空气中煅烧的光催化剂的光催化活性明显要优于在氮气中煅烧的;但在400℃时氮气中煅烧后的光催化剂对亚甲基蓝的降解作用达到了最佳,且高于同温度下在空气中煅烧的样品.而高于400℃后其降解效果逐渐下降.在空气中煅烧后的光催化剂在550℃煅烧后才对亚甲基蓝的降解活性达到了最佳状态.
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