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以过渡金属(Cr、Fe、Ni和Zn)掺杂为手段,以溶胶凝胶为制备方法,以离子液2—羟基咪唑甲酸盐为微观结构调控试剂,制备了TiO_2纳米粒子。将样品备好后,在500℃的条件下进行煅烧处理,用BET、XRD、DRS等手段进行结构表征,以酸性蓝92为模拟污染物对其光催化性能进行测定。研究结果表明,经过渡金属掺杂后的TiO_2纳米颗粒比纯TiO_2具有更高的比表面积和更小的粒径尺寸。过渡金属的掺杂使TiO_2的吸收光谱向可见光的方向移动。在紫外灯照射下,水溶液中酸性蓝92的光降解结果为:过渡金属离子的存在使TiO_2纳米颗粒的光催化活性得到了明显增强。
With the transition metal (Cr, Fe, Ni and Zn) as a means of doping, sol gel preparation method, the ionic liquid 2-hydroxyimidazolium for microstructure control reagent, prepared TiO 2 nanoparticles. The samples were prepared and calcined at 500 ℃. The structures of the samples were characterized by means of BET, XRD and DRS. The photocatalytic activity of Acid Blue 92 as a simulated pollutant was determined. The results show that the transition metal doped TiO 2 nanoparticles have higher specific surface area and smaller particle size than pure TiO 2. The transition metal doping causes the absorption spectrum of TiO 2 to move in the visible light direction. Under ultraviolet light irradiation, the photodegradation of Acid Blue 92 in aqueous solution was: the presence of transition metal ions significantly enhanced the photocatalytic activity of TiO 2 nanoparticles.