Journal
DYES AND PIGMENTS
Volume 92, Issue 3, Pages 923-928Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2011.06.009
Keywords
Opaque dye wastewater; Photocatalytic oxidation; Electrocatalytic pre-oxidation; Decoloration; Methylene blue
Funding
- National Natural Science Foundation of China [20877058]
- Ministry of Science [2008AA06Z329]
- Nanometer Science Foundation of Shanghai [0852nm01200]
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The opaque methylene blue (MB) dye wastewater hard to be degraded directly by photocatalytic (PC) oxidation was successfully decomposed by a new two-step process, in which electrocatalytic (EC) pre-oxidation was followed with photoelectric synergistic catalytic (PEC) oxidation. The SnO(2)/TiO(2) NTs electrode was used as the anode, which simultaneously has superior EC and PC performance. In the pre-oxidation step, the opaque dye wastewater is decolorized by EC oxidation, and the wastewater becomes a light transmission system, which provides the necessary condition for PC oxidation. However, the individual EC oxidation will be of low current efficiency and high energy consumption for the decreasing of the pollutants concentration in wastewater. Thus, in second stage, the PC process was introduced, and the synergistic catalytic oxidation leads to high PEC oxidation efficiency, so that the complete mineralization of the MB dye wastewater was realized. The whole process is highly efficient and energy-saving, which opens a new avenue to degrade the high-chroma or opaque dye wastewater. (C) 2011 Elsevier Ltd All rights reserved.
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