Citation: ZHAO Xiu-Qiao, DONG Li-Jun, CAO Yue, MO Shi-Jing, YI Jian-Jun, XU Qing-Hong. Exfoliated LDHs Modified with Organic Silicon Regent and Their Adsorption to Metal Ions from Wastewater[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(4): 817-825. doi: 10.3969/j.issn.1001-4861.2013.00.137 shu

Exfoliated LDHs Modified with Organic Silicon Regent and Their Adsorption to Metal Ions from Wastewater

1.
1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;

Received Date: 13 November 2012
Available Online: 4 January 2012
Fund Project: 国家自然科学基金(No.50602004) (No.50602004)吉林大学无机合成与制备化学国家重点实验室开放基金(No.2011-31)资助项目。 (No.2011-31)

This work studies modified exfoliated layered double hydroxides (Mg₂Al-NO₃-LDHs) with N-(2-aminoethyl)-3-aminopropyltriethoxysilane [(CH₃CH₂O)₃Si(CH₂)₃NH(CH₂)₂NH₂, KH-791] by covalent bonding, and its selective adsorption to Pb₂₊, Cu²⁺, and Zn₂₊ ions from aqueous solutions. The adsorption capacity for Pb₂₊, Cu²⁺, and Zn₂₊ was monitored by atomic absorption technique at different metal concentrations and temperatures. Results indicate that Pb₂₊ ion has larger absorption capacity on the modified exfoliated Mg₂Al-NO₃-LDHs (EM-LDHs) than that of Cu²⁺ and Zn₂₊ ions under the same initial concentration and temperature. Compared with Pb₂₊ ion, the adsorption for Cu²⁺ or Zn₂₊ ion is less when the initial concentration is 500 μg·mL^-1. The influence of temperature on adsorption to Pb₂₊ ion by EM-LDHs is more significant than that of Cu²⁺ and Zn₂₊ ions.
- adsorption;surface and interfaces;chemical kinetics and equilibrium;exfoliated LDH
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