A review of the removal of anions and oxyanions of the halogen elements from aqueous solution by layered double hydroxides

Theiss, Frederick L., Couperthwaite, Sara J., Ayoko, Godwin A., & Frost, Ray L. (2014) A review of the removal of anions and oxyanions of the halogen elements from aqueous solution by layered double hydroxides. Journal of Colloid and Interface Science, 417, pp. 356-368.

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Abstract

The application of layered double hydroxides (LDHs) and thermally activated LDHs for the removal of various fluorine (F-, BF-4), chlorine (Cl-,ClO-4), bromine (Br-, BrO-3) and iodine (I-, IO-3) species from aqueous solutions has been reviewed in this article. LDHs and thermally activated LDHs were able to significantly reduce the concentration of selected anions in laboratory scale experiments. The M2+:M3+ cation ratio of the LDH adsorbent was an important factor which influenced anion uptake. Though LDHs were able to remove some target anion species through anion exchange and surface adsorption thermal activation and reformation generally produced better results. The presence of competing anions including carbonate, phosphate and sulphate had a significant impact on uptake of the target anion as LDHs typically exhibit lower affinity towards monovalent anions compared to anions with multiple charges. The removal of fluoride and perchlorate from aqueous solution by a continuous flow system utilising fixed bed columns packed with LDH adsorbents has also been investigated. The adsorption capacity of the columns at breakpoint was heavily dependent on the flow rate and lower than result reported for the corresponding batch methods. There is still considerable scope for future research on numerous topics summarised in this article.

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ID Code: 65755
Item Type: Journal Article
Refereed: Yes
Keywords: Layered double hydroxide, Hydrotalcite, Water purification, Fluoride, Chloride, Bromide, Bromate, Iodide, Iodate
DOI: 10.1016/j.jcis.2013.11.040
ISSN: 00219797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier Inc.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Colloid and Interface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Colloid and Interface Science, [Volume 417, (1 March 2014)] DOI: 10.1016/j.jcis.2013.11.040
Deposited On: 08 Jan 2014 02:25
Last Modified: 08 Mar 2016 15:50

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