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

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（9）
• 页码范围: 1809-1816
• 页数: 8页
• 语种: 英文

摘要

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 N FL-S for heavy metals is in the order of Pb2+ ＞ Cu2+ ≥ Zn2+ ＞ Cd2+＞ Mn2+,and NFL-S has high kd values for Pb2+ (～106 mL/g) and Cu2+ (～105 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.