Zwitterionic glycine modified Fe/Mg-layered double hydroxides for highly selective and efficient removal of oxyanions from polluted water. (15th August 2020)

• Record Type: Journal Article
• Authors: Shi, Xiaofeng; Wang, Chao; Zhang, Jiaoxia; Guo, Li; Lin, Jing; Pan, Duo; Zhou, Juying; Fan, Jincheng; Ding, Tao; Guo, Zhanhu
• Is Part Of: Journal of materials science & technology. Volume 51(2020)
• Page Start: 8
• Page End: 15
• Publication Date: 2020-08-15
• Subjects: Glycine -- Water treatment -- Arsenic -- Oxyanions -- Selective adsorption; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2019.12.034
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: Zwitterionic glycine was employed to modify Fe/Mg-layered double hydroxides (LDH) to realize an G-Fe/Mg-LDH adsorbent with high adsorption capacities of oxygen-containing anions including As(V), P(V) and Cr(VI). When the Fe/Mg mole ratio was 0.02 mol/0.02 mol, the G-Fe/Mg-LDH has a good adsorption performance. The optimum adsorption pH value of G-Fe/Mg-LDH for oxygen-containing anions was 6. The selectivity of three oxygen-containing anions was Cr(VI)<P(V)<As(V), and the maximum adsorption capacity of As(V) reached as high as 830 mg g −1, outperforming most previously reported efficient adsorbents for As(V). The adsorption process followed Freundlich isotherm and pseudo-second-order kinetic model, suggesting the heterogeneous adsorption and chemical adsorption of the G-Fe/Mg-LDH. When the initial concentration of As(V) was 200 mg L −1, the adsorption efficiency of G-Fe/Mg-LDH was 82.5% within 30 min. This study provides a way to modify the LDHs for environmental remediation.