School of Environmental and Chemical Engineering, Shenyang Ligong University, Nanping Middle Road 6 #, Shenyang 110159, Liaoning Province, PR China.
J Hazard Mater. 2011 Oct 30;194:243-9. doi: 10.1016/j.jhazmat.2011.07.096. Epub 2011 Aug 5.
WO(3)/n-Cu(2)O and WO(3)/p-Cu(2)O composite films have been fabricated on titanium (Ti) substrates with a consecutive cathodic electrodeposition route. Those resulting films were characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Their photocatalytic activity under simulated natural light illumination was evaluated using Orange II (mainly) and Cr(VI) as model pollutants. The results indicate that WO(3)/p-Cu(2)O exhibits higher photocatalytic activity compared to both WO(3) and p-Cu(2)O alone, while the photocatalytic activity of WO(3)/n-Cu(2)O is higher than WO(3), but lower than n-Cu(2)O. Even in the absence of other reducing agents (hole scavengers), WO(3)/p-Cu(2)O also show certain photocatalytic activity towards reduction of Cr(VI). The photocatalytic activity of WO(3)/p-Cu(2)O is closely related to the deposition amount of p-Cu(2)O. Additionally, WO(3)/p-Cu(2)O composite film also possesses a relatively high stability during the reactions. The difference in photocatalytic activity between the two types of composite films is interpreted in terms of different mechanisms for transfer of charge carriers photogenerated within the heterojunctions.
WO(3)/n-Cu(2)O 和 WO(3)/p-Cu(2)O 复合膜已通过连续阴极电沉积路线在钛 (Ti) 基底上制备。用 X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 对所得薄膜进行了表征。采用模拟自然光照射下的橙 II（主要）和 Cr(VI) 作为模型污染物来评估其光催化活性。结果表明，与 WO(3) 和 p-Cu(2)O 单独相比，WO(3)/p-Cu(2)O 表现出更高的光催化活性，而 WO(3)/n-Cu(2)O 的光催化活性高于 WO(3)，但低于 n-Cu(2)O。即使在没有其他还原剂（空穴清除剂）的情况下，WO(3)/p-Cu(2)O 对 Cr(VI) 的还原也表现出一定的光催化活性。WO(3)/p-Cu(2)O 的光催化活性与 p-Cu(2)O 的沉积量密切相关。此外，WO(3)/p-Cu(2)O 复合膜在反应过程中也具有较高的稳定性。两种复合膜之间光催化活性的差异可以用异质结内光生载流子转移的不同机制来解释。
