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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 |
Appears in Collections: | Staff Publications |
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