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Enhanced removal of Sb(V) from aqueous solutions using layered double hydroxide modified with sodium dodecyl sulfate.
- Source :
- Journal of Environmental Chemical Engineering; Jun2022, Vol. 10 Issue 3, pN.PAG-N.PAG, 1p
- Publication Year :
- 2022
-
Abstract
- In this study, surfactant-modified layered double hydroxides (LDHs) were prepared via a hydrothermal method using sodium dodecyl sulfate (SDS). The synthesized sorbent (DS-LDH) was utilized for the removal of Sb(V) from aqueous solutions. The results demonstrated that DS 4 -LDH with a SDS/(Mg<superscript>2+</superscript>+Al<superscript>3+</superscript>) molar ratio of 0.35 exhibited excellent Sb(V) sorption ability (136 mg g<superscript>−1</superscript>), which was 11 times that of pure LDH (12 mg g<superscript>−1</superscript>), for an initial Sb(V) concentration of 40 mg L<superscript>−1</superscript>. Acidic and alkalescent aqueous solutions and ionic strength hardly affected Sb(V) sorption by DS 4 -LDH, whereas strong alkalinity inhibited Sb(V) sorption. Under neutral conditions, coexisting anions, including sulfate and phosphate, exhibited a significant influence on Sb(V) removal, whereas chloride, acetate, and carbonate had negligible effects. Ion exchange and the formation of brandholzite-like structures primarily contributed to the Sb(V) sorption by DS 4 -LDH. The intercalation of dodecyl sulfate ions in LDH increased the interlayer spacing, which enhanced anion exchange between the original interlayer ions of LDH and Sb(OH) 6 <superscript>-</superscript>, and facilitated contact between the interlayer functional sites and Sb(OH) 6 <superscript>-</superscript>, leading to an improved removal of Sb(V). This study proposes a new concept for the development of high-performance LDH sorbents modified by organic surfactants, which could be promising remediating substances for the efficient removal of Sb(V). [Display omitted] • LDHs modified with SDS were synthesized and employed for Sb(V) removal. • Ion exchange and the formation of brandholzite-like structures dominantly contributed to Sb(V) sorption by DS 4 -LDH. • The intercalation of DS<superscript>-</superscript> in LDH increased the interlayer spacing, conducive to the removal of Sb(V). • DS 4 -LDH possessed good tolerance to environmental interference factors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22133437
- Volume :
- 10
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Journal of Environmental Chemical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 157692591
- Full Text :
- https://doi.org/10.1016/j.jece.2022.107776