J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (9): 1809-1816.DOI: 10.1016/j.jmst.2019.04.016

• Orginal Article •     Next Articles

Selective removal of heavy metal ions in aqueous solutions by sulfide-selector intercalated layered double hydroxide adsorbent

Jing Wanga, Liang Zhanga, Tianshu Zhanga, Ting Dua, Tao Lib, Tianli Yuea, Zhonghong Lia, Jianlong Wanga*()   

  1. a College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China;
    b Shaanxi Institute for Food and Drug Control, Xi'an 710065, China
  • Received:2019-01-25 Revised:2019-03-18 Accepted:2019-04-16 Online:2019-09-20 Published:2019-07-26
  • Contact: Wang Jianlong
  • About author:

    1 These authors contributed equally to this work.

Abstract:

Remaining largely under-appreciated, a majority of metal ion sorbents are limited in their target selectivity. In this work, a 3D sulfide intercalated NiFe-layered double hydroxide (NFL-S) hierarchical sorbent has been synthesized for selective heavy metal removal. The intercalation of sulfurated groups in the interlayer of the layered double hydroxide (LDH) nanosheets endows NFL-S as a selective heavy metal ion filter; the selectivity of NFL-S for heavy metals is in the order of Pb2+ > Cu2+ ≥ Zn2+ > Cd2+> Mn2+, and NFL-S has high kd values for Pb2+ ($\widetilde{1}$06 mL/g) and Cu2+ ($\widetilde{1}$05 mL/g). Scanning electron microscopy, X-ray photoelectron spectroscopy and powder X-ray diffraction were used to analyze the composition of the as-prepared nanoadsorbent. The selective adsorption behavior was systematically studied using batch experiments, and the performance was evaluated through kinetic and isotherm studies. Moreover, the adsorption mechanism of heavy metals by NFL-S through surface complexation was also investigated, which shows great potential for water decontamination.

Key words: Layered double hydroxide nanosheets, Sulfide, Selective adsorption, Heavy metal ions