Novel chitosan goethite bionanocomposite beads for arsenic remediation

We report on the synthesis and As adsorption properties of a novel chitosan – iron (oxyhydr)oxide composite material for the remediation of arsenic-contaminated water supplies. FE-SEM, Mössbauer spectroscopy, ICP-OES and synchrotron (Bulk XAS, μXRF) techniques were applied to determine the compositi...

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Published in:Water research (Oxford) 2016-09, Vol.101, p.1-9
Main Authors: He, Jing, Bardelli, Fabrizio, Gehin, Antoine, Silvester, Ewen, Charlet, Laurent
Format: Article
Language:English
Subjects:
Adsorption
Arsenic
Arsenic - chemistry
Beads
Bionanocomposite
Chitosan
Chitosan - chemistry
Drinking water
Hydrogen-Ion Concentration
Iron
Kinetics
Remediation
Synthesis
Water Pollutants, Chemical - chemistry
Water Purification
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container_title Water research (Oxford)
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creator He, Jing
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Gehin, Antoine
Silvester, Ewen
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description We report on the synthesis and As adsorption properties of a novel chitosan – iron (oxyhydr)oxide composite material for the remediation of arsenic-contaminated water supplies. FE-SEM, Mössbauer spectroscopy, ICP-OES and synchrotron (Bulk XAS, μXRF) techniques were applied to determine the composition of the new material and investigate the As uptake efficiency and mechanism. The iron (oxyhydr)oxide phase has been identified as a nano-sized goethite, well dispersed in the chitosan matrix, leading to the name ‘chitosan goethite bionanocomposite’ (CGB). The CGB material is prepared in the form of beads of high density and excellent compression strength; the embedding of the goethite nanoparticles in the chitosan matrix allows for the high adsorption capacity of nanoparticles to be realized. CGB beads remove both As(III) and As(V) efficiently from water, over the pH range 5–9, negating the need for pre-oxidation of As(III). Kinetic studies and μXRF analysis of CGB bead sections show that diffusion-adsorption of As(V) into CGB beads is faster than for As(III). Using CGB beads, synthetic high-arsenic water (0.5 mg-As/L) could be purified to world drinking standard level (
doi_str_mv 10.1016/j.watres.2016.05.032
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subjects Adsorption
Arsenic
Arsenic - chemistry
Beads
Bionanocomposite
Chitosan
Chitosan - chemistry
Drinking water
Hydrogen-Ion Concentration
Iron
Kinetics
Remediation
Synthesis
Water Pollutants, Chemical - chemistry
Water Purification
title Novel chitosan goethite bionanocomposite beads for arsenic remediation
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