Abstract
The past two decades have witnessed the rapid development and wide application of Fe(VI) in the field of water de-contamination because of its environmentally benign character. Fe(VI) has been mainly applied as a highly efficient oxidant/disinfectant for the selective elimination of contaminants. The in situ generated iron(III) (hydr)oxides with the function of adsorption/coagulation can further increase the removal of contaminants by Fe(VI) in some cases. Because of the limitations of Fe(VI) per se, various modified methods have been developed to improve the performance of Fe(VI) oxidation technology. Based on the published literature, this paper summarized the current views on the intrinsic properties of Fe(VI) with the emphasis on the self-decay mechanism of Fe(VI). The applications of Fe (VI) as a sole oxidant for decomposing organic contaminants rich in electron-donating moieties, as a bi-functional reagent (both oxidant and coagulant) for eliminating some special contaminants, and as a disinfectant for inactivating microorganisms were systematically summarized. Moreover, the difficulties in synthesizing and preserving Fe(VI), which limits the large-scale application of Fe (VI), and the potential formation of toxic byproducts during Fe(VI) application were presented. This paper also systematically reviewed the important nodes in developing methods to improve the performance of Fe(VI) as oxidant or disinfectant in the past two decades, and proposed the future research needs for the development of Fe(VI) technologies.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 21976133) and the National Key Research and Development Program of China (No. 2019YFC1805202).
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Highlights
• The properties of Fe(VI) were summarized.
• Both the superiorities and the limitations of Fe (VI) technologies were discussed.
• Methods to improve contaminants oxidation/disinfection by Fe(VI) were introduced.
• Future research needs for the development of Fe (VI) technologies were proposed.
Special column—Young Talents
Dr Xiaohong Guan is a professor of Municipal Engineering at Tongji University, China. She obtained her Ph.D. from Hong Kong University of Science and Technology in Environmental Engineering, China. Prof. Guan also holds B.S. and M.S. degrees from Tongji University in Environmental Engineering. Research and educational activities in her Lab at Tongji University are focused on novel physical and chemical processes for water pollution control, with an emphasis on developing technologies for heavy metals and emerging organic contaminants removal. She is a recipient of the 2015 NSFC Outstanding Youth Foundation and the Second prize of Natural Sciences of Ministry of Education of China. She had been invited to talk at Gordon Conference because of the originality of her research. Now she serves as the associate editors of Water Research and Journal of Hazardous Materials.
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Wang, S., Shao, B., Qiao, J. et al. Application of Fe(VI) in abating contaminants in water: State of art and knowledge gaps. Front. Environ. Sci. Eng. 15, 80 (2021). https://doi.org/10.1007/s11783-020-1373-3
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DOI: https://doi.org/10.1007/s11783-020-1373-3