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Review on photocatalytic removal of heavy metals from water
Received date: 2020-07-05
Online published: 2020-09-03
Treatment of heavy metal pollution is challenging, and hence, is the focus of tackling environmental problems. Photocatalysis-based technologies provide a green and sustainable route to heavy metal removal. TiO$_{2}$ is regarded as the most suitable photocatalyst because of its unique photo- and electrochemical performances. However, its application under visible light and natural sunlight is limited due to its large band gap and high carrier recombination rate. This review summarises a series of photo catalysts that have been developed in the recent years for heavy metal removal. Strategies for improving the photocatalytic activity of TiO$_{2}$, which involve surface modification, metal/non-metal doping, immobilisation, and coupling with other semiconductors, were summarised; the corresponding reaction mechanisms were also discussed. Moreover, the status and drawbacks of the current research on the photocatalytic removal of heavy metals were critically discussed.
Key words： heavy metal; photocatalysis; TiO$_{2}$
XU Zhenmin, SHI Liyi . Review on photocatalytic removal of heavy metals from water[J]. Journal of Shanghai University, 2020 , 26(4) : 491 -505 . DOI: 10.12066/j.issn.1007-2861.2245
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