纳米SnO_2的制备条件及其光催化活性

Preparation and Photocatalytic Degradation Activity of Nanometer SnO_2

以 Sn Cl4· 5 H2 O为原料 ,采用水解沉淀法制备了粒度均匀的纳米 Sn O2 ,并用 IR、XRD、SEM、TEM和 BET等手段进行了表征。以二甲基二氯乙烯基磷酸酯 (DDVP)稀释液为模拟废水 ,考察了 Sn O2 的光催化分解活性。结果表明 ,所得 Sn O2 · n H2 O经 680℃焙烧后仍为金红石型 ,粒径约 8nm左右 ,其表面积为5 4.186m2 / g。Sn Cl4浓度为 5 .71× 10 -2 m ol/ L,水解温度为 3℃ ,p H=5 ,焙烧温度为 680℃条件是制备 Sn O2的最佳条件。在所得纳米 Sn O2 存在下 DDVP经 3 0 0 W高压汞灯光照 3 0 m in后 ,降解率可达 18.3 2 %。

Nanometer SnO 2 particles have been prepared from SnCl 4·5H 2O by precipitation and followed by calcination. The structure and morphology of the product were characterized by IR, XRD, SEM, TEM and BET techniques. The results indicated the products were rutile SnO 2 with average particle size of 8 nm, specific surface of 54 186 m 2/g. At the preparation conditions: c (SnCl 4)= 5 7×10 -2 mol/L, pH=5 0, hydrolysis temperature 3 ℃, and calcination temperature 680 ℃ , the sample with best photocatalytic degradation activity was obtained. The degradation degree of dimethyldichlorovinyl phosphate(DDVP) reached 18 32% after 30 min illumination in the presence of nanometer SnO 2.