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Open AccessFeature PaperArticle

An Optimized Cr(VI)-Removal System Using Sn-based Reducing Adsorbents

1
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
Water 2019, 11(12), 2477; https://doi.org/10.3390/w11122477
Received: 23 October 2019 / Revised: 17 November 2019 / Accepted: 22 November 2019 / Published: 24 November 2019
(This article belongs to the Special Issue Technologies Developing in Heavy Metals' Removal from Water)
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. View Full-Text
Keywords: hexavalent chromium; drinking water; adsorbent; tin oxy-hydroxide; abhurite; filtration hexavalent chromium; drinking water; adsorbent; tin oxy-hydroxide; abhurite; filtration
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MDPI and ACS Style

Papadopoulos, G.; Asimakidou, T.; Karfaridis, D.; Kellartzis, I.; Vourlias, G.; Mitrakas, M.; Simeonidis, K. An Optimized Cr(VI)-Removal System Using Sn-based Reducing Adsorbents. Water 2019, 11, 2477.

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