Adsorption of Heavy Metal Ions from Aqueous Solutions by Zeolite Based on Oil Shale Ash: Kinetic and Equilibrium Studies

doi:10.1007/s40242-013-2139-2

Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (1): 126-131.doi: 10.1007/s40242-013-2139-2

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Adsorption of Heavy Metal Ions from Aqueous Solutions by Zeolite Based on Oil Shale Ash: Kinetic and Equilibrium Studies

BAO Wei-wei¹, ZOU Hai-feng¹, GAN Shu-cai¹, XU Xue-chun², JI Gui-juan¹, ZHENG Ke-yan¹

1. College of Chemistry, Jilin University, Changchun 130012, P. R. China;
2. College of Earth Sciences, Jilin University, Changchun 130026, P. R. China

Received:2012-04-09 Revised:2012-08-03 Online:2013-02-01 Published:2013-01-23
Supported by:
Supported by the National Innovative Projects with Cooperation in Terms of Production, Study and Research, China (No. OSR-05) and the National Science and Technology Major Projects, China(No. 2008ZX05018-005).

Abstract

Abstract:

Na-A zeolite was successfully synthesized via the alkaline fusion method with oil shale ash as the raw material. The adsorption capacity of it was tested by removing Cu²⁺, Ni²⁺, Pb²⁺ and Cd²⁺ from aqueous solutions. The results reveal the maximum adsorption capacity of adsorbent for Pb²⁺, Cu²⁺, Cd²⁺ and Ni²⁺ were 224.72, 156.74, 118.34 and 53.02 mg/g, respectively. The effects of contact time and pH value of solutions on the adsorption efficiency of the zeolite were evaluated. Besides, The equilibrium adsorption data and the batch kinetic data were correlated with Langmuir and Freundlich models and the pseudo-first-order and pseudo-second-order models separately. The results show that the Langmuir isotherm and the pseudo-second-order equation were more suitable for the adsorption of Na-A zeolite for the metal ions. In addition, Thermodynamic parameters of the adsorption(the Gibbs free energy, entropy, and enthalpy) were also evaluated and discussed. The results demonstrate that the adsorption process was spontaneous and endothermic under natural conditions and the synthesized zeolite was an effective adsorbent for the removal of metal ions from aqueous solution.

Key words: Oil shale ash, Zeolite, Heavy metal ion, Kinetic, Adsorption isotherm

BAO Wei-wei, ZOU Hai-feng, GAN Shu-cai, XU Xue-chun, JI Gui-juan, ZHENG Ke-yan. Adsorption of Heavy Metal Ions from Aqueous Solutions by Zeolite Based on Oil Shale Ash: Kinetic and Equilibrium Studies[J]. Chemical Research in Chinese Universities, 2013, 29(1): 126-131.

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Adsorption of Heavy Metal Ions from Aqueous Solutions by Zeolite Based on Oil Shale Ash: Kinetic and Equilibrium Studies

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