Progress on the Photocatalytic Reduction Removal of Chromium Contamination

Rapid industrialization leads to increased wastewater discharge encompassing hexavalent chromium (Cr(VI)), which leads to serious environmental problems of toxicity and potential carcinogenicity. Removal of these species is normally carried out by ion‐exchange, precipitation, membrane filtration, so...

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Bibliographic Details
Published in:Chemical record 2019-05, Vol.19 (5), p.873-882
Main Authors: Zhao, Zengying, An, He, Lin, Jing, Feng, Mingchao, Murugadoss, Vignesh, Ding, Tao, Liu, Hu, Shao, Qian, Mai, Xianmin, Wang, Ning, Gu, Hongbo, Angaiah, Subramania, Guo, Zhanhu
Format: Article
Language:English
Subjects:
Additives
Carcinogenicity
Carcinogens
Catalysis
Catalysts
Chromium
Chromium removal
Contamination
Environmental risk
Hexavalent chromium
Membrane filtration
Organic chemistry
Photocatalysis
Photocatalytic reduction
Photoelectrocatalytic reduction
Pollution control
Reagents
Risk management
Risk reduction
Sludge
Toxicity
Wastewater
Wastewater discharges
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Summary:Rapid industrialization leads to increased wastewater discharge encompassing hexavalent chromium (Cr(VI)), which leads to serious environmental problems of toxicity and potential carcinogenicity. Removal of these species is normally carried out by ion‐exchange, precipitation, membrane filtration, sorption, photocatalytic reduction, etc. This review mainly focuses on the photocatalytic and photoelectrocatalytic (PEC) reduction of Cr (VI), because of their advantages over other methods such as reduced risk of secondary pollution by non‐reduced Cr (VI), no sludge formation, no need for a large amount of chemical reagents, clean and easy installation. The main factors influencing the photocatalytic reduction efficiency of Cr (VI) such as catalyst activity, solution pH, Cr adsorption on the catalyst and additives, are briefly discussed. Finally, a special emphasis is provided to the photoelectrocatalytic (PEC) reduction of Cr (VI). An insight into the photocatalytic reduction of chromium ions in water treatment.
ISSN:1527-8999
1528-0691
DOI:10.1002/tcr.201800153