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- Title
An Optimized Cr(VI)-Removal System Using Sn-based Reducing Adsorbents.
- Authors
Papadopoulos, George; Asimakidou, Theopoula; Karfaridis, Dimitrios; Kellartzis, Ioannis; Vourlias, George; Mitrakas, Manassis; Simeonidis, Konstantinos
- Abstract
Despite significant risks to human health due to elevated Cr(VI) concentrations in drinking water, a selective adsorbent capable of purifying water before consumption is still not commercially available. This work introduces an integrated household water filtration setup, for point-of-use applications, loaded with a tin-based Cr(VI)-oriented adsorbent that was tested under various contact times, pH values and Cr(VI) concentrations. The adsorbent comprises a chloride-substituted stannous oxy-hydroxide with a structure resembling that of the mineral abhurite. It demonstrated high reducing capacity that triggered the formation of insoluble Cr(III) hydroxides and the complete removal of Cr(VI) in considerably high volumes of polluted water. Test operation of the filtration system verified its ability to produce Cr(VI)-free water in compliance with the impending drinking water regulation, even for extreme initial concentrations (1000 μg/L). Apart from its high efficiency, the potential of the studied material is enhanced by its minimal-cost synthesis method carried out in a continuous-flow reactor by tin chloride precipitation under acidic conditions.
- Subjects
CONTINUOUS flow reactors; TIN chlorides; SORBENTS; WATER filtration; WATER consumption; HEXAVALENT chromium; DRINKING water
- Publication
Water (20734441), 2019, Vol 11, Issue 12, p2477
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w11122477