CdS/ZnSe/TiO2 纳米管阵列及其可见光光催化活性。

A CdS/ZnSe/TiO2 nanotube array and its visible light photocatalytic activities.

机构信息

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China; Faculty of Chemical Technology, Hanoi University of Industry, Hanoi, Viet Nam.

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.

出版信息

J Colloid Interface Sci. 2016 Jan 15;462:389-96. doi: 10.1016/j.jcis.2015.10.005. Epub 2015 Oct 9.

DOI:10.1016/j.jcis.2015.10.005

PMID:26520046

Abstract

A novel CdS/ZnSe/TiO2 nanotube array (NTA) photoelectrode was prepared by deposition of ZnSe nanoparticles (NPs) using pulse electrodeposition technique onto a TiO2 NTA. By successive ion layer adsorption and reaction (SILAR), CdS quantum dots (QDs) deposit onto a ZnSe/TiO2 NTA photoelectrode. The as-prepared CdS/ZnSe/TiO2 NTA photoelectrode performance is significantly improved, which not only greatly extends spatial separation of charges, but also enhance the utilization efficiency of visible-light. This system exhibits excellent charges transport property. The maximum photocurrent density of an 8.25mAcm(-2) was observed in the CdS/ZnSe/TiO2 NTA photoelectrode, which is 37.5, 15.86 and 1.56 times higher than bare TiO2 NTA, ZnSe/TiO2 NTA, and CdS/TiO2NTA photoelectrodes, respectively. The photocatalytic activity of CdS/ZnSe/TiO2 NTA is tested by the degradation of methyl orange (MO) in distilled water under solar light irradiation of 100mW/cm(2). Within about 120min of irradiation, 90.05% MO are removed.

摘要

一种新型的 CdS/ZnSe/TiO2 纳米管阵列（NTA）光电极是通过脉冲电沉积技术将 ZnSe 纳米颗粒（NPs）沉积在 TiO2 NTA 上来制备的。通过连续离子层吸附和反应（SILAR），CdS 量子点（QDs）沉积在 ZnSe/TiO2 NTA 光电极上。所制备的 CdS/ZnSe/TiO2 NTA 光电极性能得到了显著提高，不仅大大扩展了电荷的空间分离，而且提高了可见光的利用效率。该体系表现出优异的电荷传输性能。在 CdS/ZnSe/TiO2 NTA 光电极中观察到最大光电流密度为 8.25mAcm(-2)，分别是裸 TiO2 NTA、ZnSe/TiO2 NTA 和 CdS/TiO2NTA 光电极的 37.5、15.86 和 1.56 倍。通过在 100mW/cm(2)的太阳光照射下，在蒸馏水中降解甲基橙（MO）来测试 CdS/ZnSe/TiO2 NTA 的光催化活性。在照射约 120min 后，MO 的去除率达到 90.05%。