Removal of anionic azo dye from aqueous solution via an adsorption–photosensitized regeneration process on a TiO2 surface
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- 作者：Nan Bao (1)
Yuan Li (1)
Xiao-Hong Yu (1)
Jun-Jian Niu (1)
Guo-Lin Wu (1)
Xiao-Hong Xu (2) - 关键词：Adsorption ; TiO2 fiber ; Visible light ; Photosensitization ; Regeneration ; Azo dye
- 刊名：Environmental Science and Pollution Research
- 出版年：2013
- 出版时间：February 2013
- 年：2013
- 卷：20
- 期：2
- 页码：897-906
- 全文大小：391KB
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Yuan Li (1)
Xiao-Hong Yu (1)
Jun-Jian Niu (1)
Guo-Lin Wu (1)
Xiao-Hong Xu (2)
1. School of Environmental Science and Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Jinan, 250100, Peoples Republic of China
2. School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, Peoples Republic of China - ISSN：1614-7499
文摘
Textile dye effluents are typically characterized by strong color and recalcitrance, even at very low concentration. The process of enrichment of anionic azo dye on the surface of TiO2 fibers followed by photosensitization degradation under ambient air conditions was extensively investigated. Adsorption isotherms and zeta potentials were used to describe the “dye/TiO2 surface-interface, taking into account the effects of pH on the nature and population of the surface groups on the TiO2 fibers. The extent of the photocatalytic degradation of dye on TiO2 surface was determined by FTIR. N2 adsorption isotherms and optical spectra were employed to investigate the effect of photosensitization. The adsorption of dyes on the TiO2 surface occurs via electrostatic attraction through the formation of single- or multidentate-coordinated surface complexes. Almost complete photobleaching of the absorption band at 534?nm is achieved in ~4?h. Dye-sensitized TiO2 fiber could absorb part of the visible light spectrum (λ-lt;-00?nm). Interfacial electron transfer can potentially alter the degradation efficiency. The regenerated TiO2 fiber could be reused for subsequent decolorization without a decline in adsorption efficiency compared with freshly prepared TiO2 samples, which may be attributed to preservation of the hierarchical pore structure and restoration of the original surface properties. In summary, we propose an efficient “adsorption–photoregeneration–reuse-process applying TiO2 fibers for the degradation of dyes in water.