Removal of arsenic from water streams: an overview of available techniques |
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Authors: | Miroslava Vaclavikova George P Gallios Slavomir Hredzak Stefan Jakabsky |
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Affiliation: | (1) Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 043 53 Kosice, Slovakia;(2) Lab. Gen. and Inorg. Chemical Technology, School of Chemistry, Aristotle University, 540 06 Thessaloniki, Greece |
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Abstract: | Arsenic poisoning has become one of the major environmental worries worldwide, as millions of people, which have been exposed
to high arsenic concentrations (through contaminated drinking water), developed severe health problems. The high toxicity
of this element made necessary the enforcement of stringent maximum allowable limits in drinking water. So, the development
of novel techniques for its removal from aqueous streams is a very important issue. This paper offers an overview of geochemistry,
distribution, sources, toxicity, regulations and applications of selected techniques for arsenic removal. The contribution
briefly summarizes adsorption processes and mechanism of arsenic species removal from water streams by means of iron oxide/oxyhydroxide
based materials. Sorption capacities of various sorbents (e.g. akaganeite, goethite, hydrous ferric oxide, iron oxide coated
sand, Fe(III) loaded resin, granular ferric hydroxide, Ce(IV) doped iron oxide, natural iron ores, iron oxide coated cement,
magnetically modified zeolite, Fe-hydroxide coated alumina) have been compared. |
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Keywords: | Arsenic Characterization and distribution Toxicity Iron oxides Iron oxyhydroxide Akaganeite Nanoparticles Adsorption Wastewater treatment |
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