Photodegradation of Unsymmetrical Dimethylhydrazine by TiO2 Nanorod Arrays Decorated with CdS Nanoparticles Under Visible LightReportar como inadecuado

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Nanoscale Research Letters

, 11:496

First Online: 10 November 2016Received: 02 September 2016Accepted: 04 November 2016


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 TiO2 nanorod arrays TiO2 NRAs were grown directly on transparent conductive glass FTO via a hydrothermal method, and TiO2 NRAs-CdS heterostructure films were prepared by decorating TiO2 NRAs with CdS nanoparticles through successive ion layer adsorption and reaction SILAR. Under visible light, the TiO2 NRAs-CdS heterostructure displays enhanced photodegrading capacity compared with the bare TiO2 NRAs, and the highest photodegradation rate, 27.5% higher than that of the bare TiO2 NRAs, 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 TiO2 NRAs-CdS sample was investigated. Finally, the underlying photocatalytic mechanism was discussed according to the photoelectrochemical and photoluminescence results.

KeywordsTiO2 nanorod arrays CdS nanoparticle Photocatalysis Visible light Unsymmetrical dimethylhydrazine AbbreviationsCBConduction band

DIDeionized water

EDSEnergy-dispersive X-ray spectroscopy

FTOFluorine-doped tin oxide

GXRDGlancing angle X-ray diffraction

I–VPhotocurrent intensity versus potential



SILARSuccessive ion layer adsorption and reaction

TEMTransmission electron microscopy

TiO2 NRAsTiO2 nanorod arrays

UDMHUnsymmetrical dimethylhydrazine

VBValence band

VocOpen circuit potential

XPSX-ray photoelectron spectroscopy

XRDX-ray diffraction

Electronic supplementary materialThe online version of this article doi:10.1186-s11671-016-1718-9 contains supplementary material, which is available to authorized users.

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Autor: Xin Gao - Xiangxuan Liu - Xuanjun Wang - Zuoming Zhu - Zheng Xie - Jun Li


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