Abstract
Hexavalent chromium (Cr(VI)) and dyes are of particular environmental concern and need to be removed from water urgently due to their high toxicity. Herein, we explored the possibility of electron transferring from dye Orange II (OII) to Cr(VI) under UV and simulated solar light irradiation, expecting to simultaneously decolorize dyes and reduce Cr(VI). Experimental results show that light irradiation can partially decolorize OII but has no ability to reduce Cr(VI) in solution only with OII or Cr(VI). However, both dyes and Cr(VI) can effectively and simultaneously be decolorized and reduced in the solution containing both OII and Cr(VI) under light irradiation, and a low pH level and high OII/Cr(VI) concentration ratio significantly favor the co-removal. Additionally, insoluble organo–Cr(III) complexes identified by FTIR and XPS characterization were generated during the reaction. These complexes are beneficial to the removal of chromium and total organic carbon from water. The possible degradation pathway of OII is further proposed based on the detection of degraded products by GC-MS analysis. The results of this work offer an approach for simultaneously removing multiple contaminants.
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Funding
This work was supported by the National Natural Science Foundation of China (41572031), the National Program for support of Top-notch Young Professionals, and the Guangdong Provincial Youth Top-notch Talent Support Program (2014TQ01Z249). This is contribution No. IS-2463 from GIGCAS.
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Laipan, M., Fu, H., Zhu, R. et al. Photochemically Induced Electron Transfer: Simultaneously Decolorizing Dye and Reducing Cr(VI). Water Air Soil Pollut 228, 446 (2017). https://doi.org/10.1007/s11270-017-3642-8
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DOI: https://doi.org/10.1007/s11270-017-3642-8