The removal of lead ions of the aqueous solution by calcite with cotton morphology.

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Bibliographic Details
Title:	The removal of lead ions of the aqueous solution by calcite with cotton morphology.
Authors:	Liu, Zexiang¹, Shen, Qiuying, Zhang, Qiance¹, Bian, Longchun², Liu, Yongjun² yjliu@ynu.edu.cn, Yuan, Bo², Pan, Xuejun³, Jiang, Fengzhi fengzhij@ynu.edu.cn
Source:	Journal of Materials Science. Aug2014, Vol. 49 Issue 15, p5334-5344. 11p. 2 Diagrams, 5 Charts, 6 Graphs.
Subjects:	Adsorption capacity, Calcite analysis, Metal ions, Lead, Aqueous solutions, Thermodynamic state variables, Cotton research, Plant morphology
Abstract:	In this paper, calcite with cotton morphology was prepared by co-precipitation method using cotton as templates. The effect of contact time, initial concentration, and solution temperature on calcite adsorption of lead ions was studied using a batch technique. The maximal adsorption capacity of calcite for Pb2+ was 3347.02 mg/g with a minimum contact time of 60 min. The pseudo-second-order kinetic model and Langmuir/Freundlich isotherms were proposed for modeling kinetic and equilibrium data, respectively. Thermodynamic parameters such as ∆G0, ∆H0, and ∆S0 were calculated to reveal the nature of sorption. Original calcite and the products of adsorption were characterized using SEM, TEM/EDAX, SAED, XRD, and BET. Dissolution of calcite followed by precipitation of lead carbonate was found to be the main operating mechanism for Pb2+ adsorption by calcite. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	In this paper, calcite with cotton morphology was prepared by co-precipitation method using cotton as templates. The effect of contact time, initial concentration, and solution temperature on calcite adsorption of lead ions was studied using a batch technique. The maximal adsorption capacity of calcite for Pb2+ was 3347.02 mg/g with a minimum contact time of 60 min. The pseudo-second-order kinetic model and Langmuir/Freundlich isotherms were proposed for modeling kinetic and equilibrium data, respectively. Thermodynamic parameters such as ∆G0, ∆H0, and ∆S0 were calculated to reveal the nature of sorption. Original calcite and the products of adsorption were characterized using SEM, TEM/EDAX, SAED, XRD, and BET. Dissolution of calcite followed by precipitation of lead carbonate was found to be the main operating mechanism for Pb2+ adsorption by calcite. [ABSTRACT FROM AUTHOR]
ISSN:	00222461
DOI:	10.1007/s10853-014-8236-x