【摘要】 在溶胶-凝胶法制备Mn2+掺杂TiO2催化剂的基础上,掺入SiO2纳米粉体,制备了一种新的Mn2+-SiO2-TiO2纳米薄膜。以甲醛为降解对象,探讨该种新薄膜的光催化性能,并与单纯TiO2薄膜、Mn2+-TiO2薄膜和SiO2-TiO2薄膜进行比较。结果表明,500℃焙烧,掺杂m(Mn2+)∶m(SiO2)∶m(TiO2)=1.0∶12∶100时,Mn2+-SiO2-TiO2纳米薄膜的光催化活性最高,150 min后甲醛降解率达88%,是单纯TiO2薄膜的1.8倍。该薄膜稳定性较好,经重复7次使用,最大降解率只下降7%,表明其稳定性较好。更多还原

【Abstract】 Mn²⁺-doped TiO₂ catalyst was prepared by sol-gel method and mixed with nanometer SiO₂ powderto obtain Mn²⁺-SiO₂-TiO₂ nanometer film.The photocatalytic behaviors of the film for degradation of formaldehyde were investigated.The results showed that properties of Mn²⁺-SiO₂-TiO₂ nanometer film was superior to those of TiO₂,Mn²⁺-TiO₂ and SiO₂-TiO₂ film.When Mn²⁺-SiO₂-TiO₂=1.0∶12∶100 and at calcination temperature of 500 ℃,formaldehyde degradation of 88% was attained after 150 min,which was 1.8 times higher than that on TiO₂ film.Maximum degradation percentage on the film declined by only 8% after 7 times of repeated use.更多还原