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Arsenite adsorption on cryogels embedded with iron-aluminium double hydrous oxides: possible polishing step for smelting wastewater?
J Hazard Mater. 2013 Apr 15; 250-251:469-76.JH

Abstract

Arsenic is among the most toxic elements and it commonly exists in water as arsenite (As(III)) and arsenate (As(V)) ions. As(III) removal often requires a pre-oxidation or pH adjustment step and it is a challenge to adsorb As(III) at circumneutral pH. In this study, iron-aluminium double hydrous oxides were synthesized and incorporated into cryogels. The resulting composite cryogels were evaluated for As(III) adsorption. Initial experiments indicated that the adsorbent showed similar adsorption kinetics for both As(V) and As(III) ions. The adsorption of As(III) best fit the Langmuir isotherm and the maximum adsorption capacity was 24.6 mg/g. Kinetic modeling indicated that the mechanism of adsorption was chemisorption, making the adsorbent-adsorbate interactions independent of charge and hence allowing the adsorbent to function equally efficient across pH 4-11. A Swedish smelting wastewater was used to evaluate the adsorption performance in continuous mode. The studies showed that the adsorbent was successful in reducing the arsenic concentrations below the European Union emission limit (0.15 mg/l) in a smelting wastewater collected after two precipitation processes. The arsenic removal was obtained without requiring a pH adjustment or a pre-oxidation step, making it a potential choice as an adsorbent for As(III) removal from industrial wastewaters.

Authors+Show Affiliations

Department of Biotechnology, Lund University, P.O. Box 124, S-221 00 Lund, Sweden. Prashanth.Suresh@biotek.lu.seNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23500428

Citation

Kumar, Prashanth Suresh, et al. "Arsenite Adsorption On Cryogels Embedded With Iron-aluminium Double Hydrous Oxides: Possible Polishing Step for Smelting Wastewater?" Journal of Hazardous Materials, vol. 250-251, 2013, pp. 469-76.
Kumar PS, Onnby L, Kirsebom H. Arsenite adsorption on cryogels embedded with iron-aluminium double hydrous oxides: possible polishing step for smelting wastewater? J Hazard Mater. 2013;250-251:469-76.
Kumar, P. S., Onnby, L., & Kirsebom, H. (2013). Arsenite adsorption on cryogels embedded with iron-aluminium double hydrous oxides: possible polishing step for smelting wastewater? Journal of Hazardous Materials, 250-251, 469-76. https://doi.org/10.1016/j.jhazmat.2013.02.022
Kumar PS, Onnby L, Kirsebom H. Arsenite Adsorption On Cryogels Embedded With Iron-aluminium Double Hydrous Oxides: Possible Polishing Step for Smelting Wastewater. J Hazard Mater. 2013 Apr 15;250-251:469-76. PubMed PMID: 23500428.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Arsenite adsorption on cryogels embedded with iron-aluminium double hydrous oxides: possible polishing step for smelting wastewater? AU - Kumar,Prashanth Suresh, AU - Onnby,Linda, AU - Kirsebom,Harald, Y1 - 2013/02/20/ PY - 2012/10/08/received PY - 2013/02/11/revised PY - 2013/02/13/accepted PY - 2013/3/19/entrez PY - 2013/3/19/pubmed PY - 2013/10/25/medline SP - 469 EP - 76 JF - Journal of hazardous materials JO - J Hazard Mater VL - 250-251 N2 - Arsenic is among the most toxic elements and it commonly exists in water as arsenite (As(III)) and arsenate (As(V)) ions. As(III) removal often requires a pre-oxidation or pH adjustment step and it is a challenge to adsorb As(III) at circumneutral pH. In this study, iron-aluminium double hydrous oxides were synthesized and incorporated into cryogels. The resulting composite cryogels were evaluated for As(III) adsorption. Initial experiments indicated that the adsorbent showed similar adsorption kinetics for both As(V) and As(III) ions. The adsorption of As(III) best fit the Langmuir isotherm and the maximum adsorption capacity was 24.6 mg/g. Kinetic modeling indicated that the mechanism of adsorption was chemisorption, making the adsorbent-adsorbate interactions independent of charge and hence allowing the adsorbent to function equally efficient across pH 4-11. A Swedish smelting wastewater was used to evaluate the adsorption performance in continuous mode. The studies showed that the adsorbent was successful in reducing the arsenic concentrations below the European Union emission limit (0.15 mg/l) in a smelting wastewater collected after two precipitation processes. The arsenic removal was obtained without requiring a pH adjustment or a pre-oxidation step, making it a potential choice as an adsorbent for As(III) removal from industrial wastewaters. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/23500428/Arsenite_adsorption_on_cryogels_embedded_with_iron_aluminium_double_hydrous_oxides:_possible_polishing_step_for_smelting_wastewater L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(13)00131-3 DB - PRIME DP - Unbound Medicine ER -