以钛酸四丁酯为原料,采用溶胶-凝胶法制备了纯TiO_2与Mo掺杂TiO_2纳米粒子,并利用XRD、UV-VIS、XPS等测试手段对制备的TiO_2纳米粒子进行表征;以亚甲基蓝为光催化反应模型,考察了煅烧温度、钼掺杂量等对TiO_2晶格畸变,晶粒大小,晶型,光学性能及光催化活性的影响.结果表明:大部分Mo~(6+)取代晶格中Ti~(4+)的位置,引起晶格畸变,抑制晶粒长大与TiO_2由锐钛矿相向金红石相转变;样品经450 ℃煅烧, 随Mo掺杂量增加,激发波长红移增加,当煅烧温度升至600 ℃,1.8%Mo-TiO_2样品中锐钛矿相含量增加,致光激发波长蓝移;适量的Mo掺杂有利于提高TiO_2光催化效果,Mo掺杂物质的量分数为1.8%, 经600 ℃煅烧后样品的光催化性能最佳.
The pure TiO_2 and Mo-doped TiO_2 nanoparticles were prepared by Sol-gel method with tetrabutyl titanate as raw material and characterized by XRD, UV-VIS and XPS. The photocatalytic activity was investigated by degradation of methylene blue. Effects of calcined temperature and doping content of Mo on crystal lattice distortion, grain size, crystal phase, optical properties and photocatalytic activities were investigated. The results show that most of Mo~(6+) takes the place of Ti~(4+) in the crystal lattice of TiO_2, which leds to distortion of crystal lattice, restrains the increase of grain size and inhabits the phase transformation from anatase to rutile of TiO_2. Exciation wavelength red shift more with doping more Mo content calcined at 450 ℃. The content of anatase phase in 1.8%Mo-TiO_2 mixed crystal calcined at 600 ℃, and inducing exciation wavelength blue shift. Doping with the appropriate content of Mo improves the photocatalytic activity of TiO_2, the photocatalytic activity of 1.8%(in mole) Mo doped TiO_2 nanoparticles is optical calcined at 600 ℃.
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