纳米SnO2@TiO2包覆催化剂的制备及表征

采用活性层包覆法在自制细SnO2胶体粒子表面包覆TiO2，制备出SnO2@TiO2包覆型复合催化剂，以其对有机磷农药DDVP的降解效果作为评价光催化活性的标准，对制备条件进行了优化，并用XRD、TEM和BET等手段对样品进行了表征，结果表明，SnO2胶体乙醇溶液含水量20％，钛酸丁酯质量分数为34.5％。灼烧温度680℃时制得TiO2含量56.45％的包覆样品SnO2@TiO2为纳米级粒子，且其光催化活性最佳。

Preparation and Characterization of Nanometer Photocatalysis SnO2@TiO2

SnO2@TiO2 coated particles have been prepared with Ti(OC4H9)4 by hydrolysis cross-link TiO2 on active SnO2 hydrated particle. Its morphology and structure were characterized by XRD, TEM, and BET method. In order to improve the photocatalytic degradation activity of SnO2@TiO2 for dichlorvos, the conditions of preparing were selected and the better photocatalytic activity were received. The result indicated that: SnO2@TiO2 was composited with ranatase TiO2 and rutile SnO2. When mass fraction of TiO2 in SnO2@TiO2 is 56.45%, water content in SnO2 alcohol solution is 20%, volume fraction of Ti(OC4H9)4 in alcohol solution is 34.5%, and ignition temperature of SnO2@TiO2 is 680 ℃, the best photocatalytic activity of SnO2@TiO2 were received. The other factors of effect of SnO2@TiO2 photocatalytic activity were given.