Journal
CARBOHYDRATE POLYMERS
Volume 173, Issue -, Pages 28-36Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.05.070
Keywords
Nano iron oxide; Chitosan; Adsorption; Reduction; Hexavalent chromium; Sorbent bead
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Funding
- Natural Science Foundation of Tianjin [12JCYBJC14800]
- Research Fund of Tianjin Key Laboratory of Aquatic Science and Technology [TJKLAST-PT-2016-05]
- project of Tianjin City International Training Programme for Selected Outstanding Postdoctors
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Using Fe(III) salts and chitosan, nano iron oxide impregnated in chitosan bead (NIOC) was successfully synthesized for aqueous Cr(VI) detoxification via sol-gel technique without any additional crosslinking agent. NIOC characterization demonstrated that the iron in NIOC mainly existed as nano akaganeite (beta-FeOOH) and complex with chitosan. Intraparticle diffusion was the major rate-limiting step. The maximal adsorption capacity was 69.8 mg/g (pH 5.0, 20 degrees C). Normal concentration of coexisting anions( SO42-, CO32-, SiO32-) showed insignificant competition, whereas PO43- suppressed the Cr(VI) sorption. Cr(VI)-loaded NIOC could be effectively regenerated by alkaline solutions. Column adsorption runs using granular NIOC could effectively treat about 1600 bed volumes of Cr(VI) solution (from 3.7 mg Cr/L in influent to <0.5 mg Cr/L in effluent). The Cr(VI) removal mechanisms involved the direct sorption of Cr(VI) (electrostatic attraction and ligand exchange), reduction of Cr(VI) into Cr(III) and re-sorption of Cr(III) via chelation on NIOC surface. (C) 2017 Elsevier Ltd. All rights reserved.
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