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以钛酸丁酯和硝酸镨为原料,采用溶胶-微波法合成纳米Pr-TiO_2。采用X射线衍射、扫描电镜、X射线能谱和紫外-可见光等手段研究了煅烧温度对其晶体结构、表观形貌及光学性能的影响。结果表明:镨的掺杂对纳米TiO_2的形貌及光催化性能有显著影响。镨的掺杂抑制了晶粒的生长,抑制了晶型由锐钛矿相向金红石相的转变。随着煅烧温度的增加,纳米TiO_2团聚加剧,比表面积降低,锐钛矿相逐渐向金红石相转变,并且光催化过程中产生的活性羟基量逐渐减少,光催化活性逐渐降低,其中当煅烧温度为500℃时所合成的纳米Pr-TiO_2的光催化效果最优。Pr掺杂TiO_2提高了可见光的利用率并且红移了50nm。
Titanium tetrabutoxide and praseodymium nitrate were used as raw materials to synthesize nano-Pr-TiO_2 by sol-microwave method. The effects of calcination temperature on its crystal structure, apparent morphology and optical properties were studied by X-ray diffraction, scanning electron microscopy, X-ray energy dispersive spectroscopy and UV-Vis. The results show that praseodymium doping has a significant effect on the morphology and photocatalytic activity of nano-TiO2. The doping of praseodymium suppresses the grain growth and inhibits the transformation of the crystalline phase from anatase phase to rutile phase. With the increase of calcination temperature, the agglomeration of nano-TiO 2 intensifies, the specific surface area decreases, and the anatase phase gradually changes to rutile phase, and the amount of active hydroxyl groups in the photocatalytic process gradually decreases and the photocatalytic activity decreases gradually. When the calcination temperature is The photocatalytic activity of nano-Pr-TiO 2 synthesized at 500 ℃ is the best. Pr-doped TiO 2 increases the utilization of visible light and is red-shifted by 50 nm.