Enhanced removal of Sb(V) from aqueous solutions using layered double hydroxide modified with sodium dodecyl sulfate. Issue 3 (June 2022)

• Record Type: Journal Article
• Authors: Hu, Yunxuan; Zhang, Shuangyu; Luo, Chenghui; Wan, Lei; Wu, Shuang; Baig, Shams Ali; Xu, Xinhua
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 3(2022)
• Publication Date: 2022-06
• Subjects: Layered double hydroxide -- Sb(V) removal -- Sodium dodecyl sulfate -- Enhanced removal -- Organic surfactant; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107776
• Languages: English
• ISSNs: 2213-2929

Abstract

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 DS4 -LDH with a SDS/(Mg 2+ +Al 3+ ) molar ratio of 0.35 exhibited excellent Sb(V) sorption ability (136 mg g −1 ), which was 11 times that of pure LDH (12 mg g −1 ), for an initial Sb(V) concentration of 40 mg L −1 . Acidic and alkalescent aqueous solutions and ionic strength hardly affected Sb(V) sorption by DS4 -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 DS4 -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 -, and facilitated contact between the interlayer functional sites and Sb(OH)6 -, 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). Graphical Abstract: ga1 Highlights: 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 DS4 -LDH. The intercalation of DS - in LDH increased the interlayer spacing, conducive to the removal of Sb(V). DS4 -LDH possessed good tolerance to environmental interference factors.