Photocatalytic activity of aqueous WO3 sol for the degradation of Orange II and 4-chlorophenol
Photocatalytic activity of aqueous WO3 sol for the degradation of Orange II and 4-chlorophenol
复制标题
DOI：
10.1016/j.apcata.2012.12.038
复制
发表时间：
2013-03
影响因子：
5.5
通讯作者：
S. Yamazaki;T. Yamate;Kenta Adachi
中科院分区：
文献类型：
--
作者：
S. Yamazaki;T. Yamate;Kenta Adachi
研究了一种透明的WO 3水溶胶对橙子II的光催化褪色作用。根据橙子II与WO 3胶体颗粒之间的静电相互作用解释了橙子II的降解速率与WO 3溶胶的pH和离子强度的关系。降解速率与橙子II的浓度呈一级动力学关系。实验结果表明，在空气饱和条件下，WO 3溶胶在氮气气氛下不会发生光致变色现象，因此WO 3中的光生电子有效地还原了O2. WO 3的光催化活性是TiO 2的0.5倍，与TiO 2溶胶混合后，WO 3的光催化活性得到了提高。当WO 3：TiO 2摩尔比为1：2时，复合溶胶对橙子Ⅱ的光催化降解效果最好。对4-氯苯酚的降解也证实了类似的光催化活性增强。
Photocatalysis of a transparent aqueous WO3sol was investigated for the color-fading of Orange II. Dependence of the degradation rate of Orange II on pH and ionic strength of the WO3sol was explained in terms of the electrostatic interaction between Orange II and the WO3colloid particles. The degradation rate follows the first-order kinetics with respect to the concentration of Orange II. It was demonstrated that the photogenerated electron in WO3reduced O2effectively since the photochromism of the WO3sol observed under nitrogen atmosphere did not occur under air-saturated condition. The photocatalytic activity of WO3was lower than that of TiO2by a factor of 0.5 and was enhanced by mixing with the TiO2sol. The best photocatalytic performance for the degradation of Orange II was obtained by using the mixed sol with WO3:TiO2molar ratio of 1:2. Similar enhancement in the photocatalytic activity was confirmed for the degradation of 4-chlorophenol.