采用光催化还原沉积技术制备了不同银(1 mol％,2mol％,3mol％,4mol％)沉积量的纳米二氧化钛,在此基础上以竹炭为载体通过浸渍法制备了负载型光催化复合材料;XRD表征分析结果表明银在二氧化钛表面主要以氧化物的形态存在,TEM表征结果表明银改性的纳米二氧化钛粉体成功负载于竹炭表面;但并没有发现明显的银单质团簇.可见光照射下,2mol％银改性使复合光催化材料具有最佳光催化氧化甲基橙的活性,双氧水的存在可进一步提高甲基橙的氧化效果,反应过程符合一级动力学规律,反应体系易实现固液分离.
Ag-doped (1 mol％,2mol％,3mol％,4mol％ ) TiO2 loaded on bamboo charcoal (BC) was prepared by impregnation and photocatalytic reduction deposition technique.The as-prepared samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM).The results showed Ag doping exist on the surface of TiO2 in the state of silver oxide.When it's used as the catalyst to degrade methyl orange (MO) under visible light,the 2％ Ag-doped sample show the best photocatalytic property.Moreover,the decolorization rate reach 76.8％ in the presence of H2O2.In addition,kinetics parameters of the photocatalytic oxidation of MO were measured and calculated.The result shows photocatalytic oxidation of MO follows first-order kinetics.
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