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Citation: ZHANG Shu-Qin, HOU Wan-Guo, LU Fu-Sui, LI Li-Fang, JIANG Lin. Adsorption of Pb²⁺ on Layered Double Hydroxide and EDTA-LDHs[J]. Chinese Journal of Applied Chemistry, ;2010, 27(2): 142-146. doi: 10.3724/SP.J.1095.2010.90101 shu

Adsorption of Pb²⁺ on Layered Double Hydroxide and EDTA-LDHs

a. College of Chemistry and Material Science, Shandong Agriculture University, Taian 271018;
b. College of Chemistry and molecular engineering, Qingdao University of Science Technology, Qingdao

Received Date: 15 February 2009
Revised Date: 2 June 2009

Well crystalled MgAl-layered double hydroxide(MgAl-LDH) and EDTA-LDH nanohybrids were synthesized via a co-precipitation method and characterized. The ligand EDTA is probably accommodated in vertical position in the interlayer space of LDH. The sorption behavior of MgAl-LDH and EDTA-LDH nanohybrids for lead ions was also investigated as a function of concentration,pH and time. It is found that both of them show good sorption ability for Pb²⁺. The sorption rate and the equilibrium sorption amount of Pb²⁺ are higher on EDTA-LDH nanohybrids than on MgAl-LDH under identical conditions,which indicate the intercalation of EDTA exhibits synergy. The sorption can be described by the pseudo-second order kinetics. The sorption occurrs in two steps,an adsorption process followed by surface precipitation. The adsorption isotherms are well fitted to Freundlich isotherm. Within the experimental concentration range,the variation of adsorbed amount is not obvious with the variation of pH because of the compound having a property of buffering pH(buffering pH effect).
- layered double hydroxide,
- EDTA,
- lead,
- adsorption
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Adsorption of Pb²⁺ on Layered Double Hydroxide and EDTA-LDHs