为研究由还原氧化石墨烯(RGO)和具有高活性晶面的TiO2组成的复合材料的制备方法及其光催化性能,首先采用两步水热法制备了RGO/纳米TiO2复合材料:第1步为合成暴露高活性晶面的纳米TiO2;第2步为将合成的纳米TiO2与氧化石墨烯(GO)复合,形成RGO/纳米TiO2复合材料.然后,利用XRD、SEM、X射线光电子能谱仪和紫外-可见漫反射光谱等手段对制备的暴露不同晶面的纳米TiO2和RGO/纳米TiO2复合材料进行了表征,评价了其光催化性能.结果表明:在水热法的第1步中,通过调节HF的浓度能可控制备出具有高活性的(001)和(101)晶面的纳米TiO2,氟原子在纳米TiO2中以物理吸附态和化学结合态这2种形态存在;在第2步后,GO与纳米TiO2复合形成RGO/纳米TiO2复合材料,同时在此过程中GO被转化成RGO.在紫外光照射下,两步水热法合成的RGO/纳米TiO2复合材料具有很好的光催化性能,明显优于商用TiO2(P25)和纳米TiO2的.RGO/纳米TiO2复合材料的光催化性能有明显的提高,RGO和TiO2暴露的晶面对光催化活性有影响.
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