Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jhazmat.2010.03.077
Title: Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
Authors: Goh, K.-H.
Lim, T.-T.
Banas, A. 
Dong, Z.
Keywords: Anion exchange
Layered double hydroxide
Oxyanion
Oxyhalide
Sorption
Issue Date: Jul-2010
Citation: Goh, K.-H., Lim, T.-T., Banas, A., Dong, Z. (2010-07). Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles. Journal of Hazardous Materials 179 (1-3) : 818-827. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jhazmat.2010.03.077
Abstract: The sorption ability of fast-coprecipitated and hydrothermally-treated Mg/Al layered double hydroxide nanoparticles (FCHT-LDH) for various oxyhalides and oxyanions was evaluated. Interactions of oxyhalide such as monovalent bromate or oxyanions such as divalent chromate and divalent vanadate with FCHT-LDH were investigated using a combination of macroscopic (batch sorption/desorption studies and electrophoretic mobility (EM) measurements) and microscopic techniques (CHNS/O, XRD, FTIR, XPS, and EXAFS analyses). The sorption studies on various oxyanions and oxyhalides suggested that their sorption characteristics on FCHT-LDH were largely governed by their ionic potentials and molecular structures. Oxyanions which have ionic potentials higher than 7nm-1 were found to be more readily sorbed by FCHT-LDH than oxyhalides with ionic potentials lower than 5nm-1. The results obtained also demonstrated that trigonal pyramid oxyhalides showed a lower degree of specificity for FCHT-LDH than the tetrahedral coordinated oxyanions. From the macroscopic and microscopic studies, monovalent oxyhalide sorption on FCHT-LDH was postulated to occur mainly via anion exchange mechanism with subsequent formation of outer-sphere surface complexes. For polyvalent oxyanion sorption on FCHT-LDH, the mechanisms were possibly associated with both anion exchange and ligand exchange reactions, resulting in the coexistence of outer-sphere and inner-sphere surface complexes. © 2010 Elsevier B.V.
Source Title: Journal of Hazardous Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/115290
ISSN: 03043894
DOI: 10.1016/j.jhazmat.2010.03.077
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