Photodegradation of Unsymmetrical Dimethylhydrazine by TiO2Nanorod Arrays Decorated with CdS Nanoparticles Under Visible Light.
Photocatalysis technology could utilize solar energy to degrade many toxic pollutants and provides possibility to deal with unsymmetrical dimethylhydrazine (UDMH) wastewater with less energy consumption. In this study, well-aligned TiO2nanorod arrays (TiO2NRAs) were grown directly on transparent conductive glass (FTO) via a hydrothermal method, and TiO2NRAs/CdS heterostructure films were prepared by decorating TiO2NRAs with CdS nanoparticles through successive ion layer adsorption and reaction (SILAR). Under visible light, the TiO2NRAs/CdS heterostructure displays enhanced photodegrading capacity compared with the bare TiO2NRAs, and the highest photodegradation rate, 27.5% higher than that of the bare TiO2NRAs, was achieved by the sample with 15 SILAR cycles. Additionally, the solution pH had some influence on the degradation process, which shows that the best degradation rate can be achieved in the neutral solution (pH is ca. 7.2), and the photodegradation process can be better in alkaline solution than in the acid solution. Moreover, the visible photocatalytic stability of the TiO2NRAs/CdS sample was investigated. Finally, the underlying photocatalytic mechanism was discussed according to the photoelectrochemical and photoluminescence results.
High-Tech Institute of Xi'an, Shaanxi, 710025, China.
Xin
X
Gao
High-Tech Institute of Xi'an, Shaanxi, 710025, China.
Xiangxuan
X
Liu
High-Tech Institute of Xi'an, Shaanxi, 710025, China.
Xuanjun
X
Wang
High-Tech Institute of Beijing, Beijing, 100085, China.
Zuoming
Z
Zhu
High-Tech Institute of Xi'an, Shaanxi, 710025, China. xiezheng10@tsinghua.org.cn.
Zheng
Z
Xie
High-Tech Institute of Xi'an, Shaanxi, 710025, China.
Jun
J
Li
CdS nanoparticle; Photocatalysis; TiO2 nanorod arrays; Unsymmetrical dimethylhydrazine; Visible light