可见光响应TiO2光催化降解钾肥浮选药剂

Degradation of Potassium Fertilizer Flotation Agents by TiO2 with Visible-Light Response

中文关键词:  黑色TiO₂  十八胺  十二烷基吗啉  光催化降解  钾 肥

英文关键词:Black TiO₂  Octadecylamine  Dodecylmorpholine  Photocatalytic degradation  Potash fertilizer

中文摘要:

      锐钛矿相TiO₂只能响应在自然光中占5%左右的紫外光，不能利用可见光开展有机物的光催化降解，因此通过NaBH4高温还原的方法制备了缺陷型自掺杂黑色TiO₂材料，考察了还原温度与还原时间对于材料晶体结构、微观形貌、光电性能及可见光条件下(λ ≥ 400 nm)对十八胺、十二烷基吗啉光催化降解活性的影响。结果表明，在300 ℃还原5 h条件下所制备的材料对十八烷胺和十二烷基吗啉中的胺态氮6 h降解率分别为77.56%和69.59%，相比于锐钛矿相TiO₂(14.11%和21.92%)有所提升。相关表征测试说明，高温还原方法成功实现对材料的缺陷构筑，提升了TiO₂材料对可见光的吸收和响应能力，提高了可见光下对钾肥浮选药剂的降解效率。

英文摘要:

      Anatase can only respond to the ultraviolet light which accounts for about 5% of the natural light， and is unablt to carry out the photocatalytic degradation of organic matters under visible light. Therefore， the defective self-doped black TiO₂ material was prepared by the method of NaBH4 high-temperature reduction. The effects of reduction temperature and reduction time on the crystal structure， microscopic morphology， photoelectric properties and visible light conditions (λ≥400 nm) of the material were investigated. The results showed that the degradation rate of amine nitrogen in octadecylamine and dodecylmorpholine was 77.56% and 69.59% respectively， which was higher than that of anatase TiO₂. Relevant characterization tests showed that the high-temperature reduction method successfully achieved the defect construction of the material， improved the absorption and response ability of TiO₂ material to visible light， and improved the degradation efficiency of potassium fertilizer flotation agent under visible light.