J. Mater. Sci. Technol. ›› 2020, Vol. 51: 8-15.DOI: 10.1016/j.jmst.2019.12.034

• Research Article • Previous Articles     Next Articles

Zwitterionic glycine modified Fe/Mg-layered double hydroxides for highly selective and efficient removal of oxyanions from polluted water

Xiaofeng Shia, Chao Wanga,b, Jiaoxia Zhangc,i, Li Guoa, Jing Lind,*(), Duo Pane, Juying Zhouf,h, Jincheng Fang, Tao Dingh, Zhanhu Guoi,*()   

  1. a Advanced Energy Materials and Systems Institute, North University of China, Taiyuan 030051, China
    b School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
    c School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    d School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
    e Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China
    f College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China
    g Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA
    h School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
    i College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
  • Received:2019-10-14 Revised:2019-11-25 Accepted:2019-12-08 Published:2020-08-15 Online:2020-08-11
  • Contact: Jing Lin,Zhanhu Guo

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.

Key words: lycine, Water treatment, Arsenic, Oxyanions, Selective adsorption