Determining the degradation efficiency and mechanisms of ethyl violet using HPLC-PDA-ESI-MS and GC-MS

Chemistry Central Journal

Wen-Hsin Chung²  Chung-Shin Lu³  Wan-Yu Lin²  Jian-Xun Wang¹  Chia-Wei Wu¹  Chiing-Chang Chen¹ 

[1] Department of Science Application and Dissemination, National Taichung University of Education, Taichung 403, Taiwan, Republic of China

[2] Department of Plant Pathology, National Chung Hsing University, Taichung, 402, Taiwan, Republic of China

[3] Department of General Education, National Taichung, University of Science and Technology, Taichung, 403, Taiwan, Republic of China

关键词: Degradation mechanism;    Zinc foil;    EV dye;    GC-MS;    HPLC-PDA-ESI-MS;   

Others  :  788113
DOI  :  10.1186/1752-153X-6-63

 received in 2012-02-21, accepted in 2012-06-07,  发布年份 2012

【 摘 要 】

Background

The discharge of wastewater that contains high concentrations of reactive dyes is a well-known problem associated with dyestuff activities. In recent years, semiconductor photocatalysis has become more and more attractive and important since it has a great potential to contribute to such environmental problems. One of the most important aspects of environmental photocatalysis is in the selection of semiconductor materials like ZnO and TiO₂, which are close to being two of the ideal photocatalysts in several respects. For example, they are relatively inexpensive, and they provide photo-generated holes with high oxidizing power due to their wide band gap energy. In this work, nanostructural ZnO film on the Zn foil of the Alkaline-Manganese Dioxide-Zinc Cell was fabricated to degrade EV dye. The major innovation of this paper is to obtain the degradation mechanism of ethyl violet dyes resulting from the HPLC-PDA-ESI-MS analyses.

Results

The fabrication of ZnO nanostructures on zinc foils with a simple solution-based corrosion strategy and the synthesis, characterization, application, and implication of Zn would be reported in this study. Other objectives of this research are to identify the reaction intermediates and to understand the detailed degradation mechanism of EV dye, as model compound of triphenylmethane dye, with active Zn metal, by HPLC-ESI-MS and GC-MS.

Conclusions

ZnO nanostructure/Zn-foils had an excellent potential for future applications on the photocatalytic degradation of the organic dye in the environmental remediation. The intermediates of the degradation process were separated and characterized by the HPLC-PDA-ESI-MS and GC-MS, and twenty-six intermediates were characterized in this study. Based on the variation of the amount of intermediates, possible degradation pathways for the decolorization of dyes are also proposed and discussed.

【 授权许可】

   
2012 Wang et al.; licensee BioMed Central Ltd.

【 图 表 】

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