SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (9): 974-982.DOI: 10.1016/S1004-9541(13)60529-7

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Removal of Cu2+ from Aqueous Solutions Using Na-A Zeolite from Oil Shale Ash

BAO Weiwei1, LIU Lu1, ZOU Haifeng1, GAN Shucai1, XU Xuechun2, JI Guijuan1, GAO Guimei1, Zheng Keyan1   

  1. 1 College of Chemistry, Jilin University, Changchun 130012, China;
    2 College of Earth Science, Jilin University, Changchun 130026, China
  • Received:2012-08-22 Revised:2012-12-03 Online:2013-10-01 Published:2013-09-28
  • Contact: ZOU Haifeng, GAN Shucai
  • Supported by:

    Supported by the National Innovative Projects with Cooperation in terms of Production, Study and Research (OSR-05), and the National Science and Technology Major Projects (2008ZX05018-005)

Removal of Cu2+ from Aqueous Solutions Using Na-A Zeolite from Oil Shale Ash

包维维1, 刘璐1, 邹海峰1, 甘树才1, 徐学纯2, 季桂娟1, 高桂梅1, 郑克岩1   

  1. 1 College of Chemistry, Jilin University, Changchun 130012, China;
    2 College of Earth Science, Jilin University, Changchun 130026, China
  • 通讯作者: ZOU Haifeng, GAN Shucai
  • 基金资助:

    Supported by the National Innovative Projects with Cooperation in terms of Production, Study and Research (OSR-05), and the National Science and Technology Major Projects (2008ZX05018-005)

Abstract: Na-A zeolite was synthesized using oil shale ash (OSA), which is a solid by-product of oil shale processing. The samples were characterized by various techniques, such as scanning electron microscopy, X-ray diffraction and Brunauer Emmet Teller method. The batch isothermal equilibrium adsorption experiments were performed to evaluate the ability of Na-A zeolite for removal of Cu(II) from aqueous solutions. The effects of operating parameters, such as concentration of copper solutions, adsorbent dosages, pH value of solutions and temperature, on the adsorption efficiency were investigated. The equilibrium adsorption data were fitted with Langmuir and Freundlich models. The maximum adsorption capacity of Na-A zeolite obtained from the Langmuir adsorption isotherm is 156.7 mg·g-1 of Cu(II). The increase of pH level in the adsorption process suggests that the uptake of heavy metals on the zeolite follows an ion exchange mechanism. The batch kinetic data fit the pseudo-second order equation well. The thermodynamic parameters, such as changes in Gibbs free energy (DG), enthalpy (DH) and entropy (DS), are used to predict the nature of the adsorption process. The negative DG values at different temperatures confirm that the adsorption processes are spontaneous.

Key words: oil shale ash, zeolite, copper removal, adsorption isotherm

摘要: Na-A zeolite was synthesized using oil shale ash (OSA), which is a solid by-product of oil shale processing. The samples were characterized by various techniques, such as scanning electron microscopy, X-ray diffraction and Brunauer Emmet Teller method. The batch isothermal equilibrium adsorption experiments were performed to evaluate the ability of Na-A zeolite for removal of Cu(II) from aqueous solutions. The effects of operating parameters, such as concentration of copper solutions, adsorbent dosages, pH value of solutions and temperature, on the adsorption efficiency were investigated. The equilibrium adsorption data were fitted with Langmuir and Freundlich models. The maximum adsorption capacity of Na-A zeolite obtained from the Langmuir adsorption isotherm is 156.7 mg·g-1 of Cu(II). The increase of pH level in the adsorption process suggests that the uptake of heavy metals on the zeolite follows an ion exchange mechanism. The batch kinetic data fit the pseudo-second order equation well. The thermodynamic parameters, such as changes in Gibbs free energy (DG), enthalpy (DH) and entropy (DS), are used to predict the nature of the adsorption process. The negative DG values at different temperatures confirm that the adsorption processes are spontaneous.

关键词: oil shale ash, zeolite, copper removal, adsorption isotherm