SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (4): 710-721.DOI: 10.1016/j.cjche.2014.05.019

• 能源、资源与环境技术 • 上一篇    下一篇

Use of chemically activated cotton nut shell carbon for the removal of fluoride contaminated drinking water: Kinetics evaluation

Rajan Mariappan1, Raj Vairamuthu2, Alagumuthu Ganapathy3   

  1. 1 Department of Natural Products Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India;
    2 Advanced Materials Research Laboratory, Department of Chemistry, Periyar University, Salem 636011, Tamil Nadu, India;
    3 PG and Research Centre of Chemistry, Sri Paramakalyani College, Alwarkurichi 627412, Tamil Nadu, India
  • 收稿日期:2013-10-12 修回日期:2014-05-05 出版日期:2015-04-28 发布日期:2015-05-13
  • 通讯作者: Rajan Mariappan
  • 基金资助:

    Supported by the University Grants Commission (UGC),Government of India,New Delhi under the Major Research Project (32-296/2006 SR).

Use of chemically activated cotton nut shell carbon for the removal of fluoride contaminated drinking water: Kinetics evaluation

Rajan Mariappan1, Raj Vairamuthu2, Alagumuthu Ganapathy3   

  1. 1 Department of Natural Products Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India;
    2 Advanced Materials Research Laboratory, Department of Chemistry, Periyar University, Salem 636011, Tamil Nadu, India;
    3 PG and Research Centre of Chemistry, Sri Paramakalyani College, Alwarkurichi 627412, Tamil Nadu, India
  • Received:2013-10-12 Revised:2014-05-05 Online:2015-04-28 Published:2015-05-13
  • Contact: Rajan Mariappan
  • Supported by:

    Supported by the University Grants Commission (UGC),Government of India,New Delhi under the Major Research Project (32-296/2006 SR).

摘要: Chemically activated cotton nut shell carbons (CTNSCs) were prepared by different chemicals and they were used for the removal of fluoride from aqueous solution. Effects of adsorption time, adsorbent dose, pH of the solution, initial concentration of fluoride, and temperature of the solution were studied with equilibrium, ther-modynamics and kinetics of the adsorption process by various CTNSC adsorbents. It showed that the chemically activated CTNSCs can effectively remove fluoride from the solution. The adsorption equilibrium data correlate well with the Freundlich isotherm model. The adsorption of fluoride by the chemically activated CTNSC is spontaneous and endothermic in nature. The pseudo first order, pseudo second order and intra particle diffusion kinetic models were applied to test the experimental data. The pseudo second order kinetic model provided a better correlation of the experimental data in comparison with the pseudo-first-order and intra particle diffusion models. A mechanismof fluoride adsorption associating chemisorption and physisorption processes is presented allowing the discussion of the variations in adsorption behavior between these materials in terms of specific surface area and porosity. These data suggest that chemically activated CTNSCs are promising materials for fluoride sorption.

关键词: Activated carbon, Cotton nut shell, Fluoride, Isotherm, Kinetics

Abstract: Chemically activated cotton nut shell carbons (CTNSCs) were prepared by different chemicals and they were used for the removal of fluoride from aqueous solution. Effects of adsorption time, adsorbent dose, pH of the solution, initial concentration of fluoride, and temperature of the solution were studied with equilibrium, ther-modynamics and kinetics of the adsorption process by various CTNSC adsorbents. It showed that the chemically activated CTNSCs can effectively remove fluoride from the solution. The adsorption equilibrium data correlate well with the Freundlich isotherm model. The adsorption of fluoride by the chemically activated CTNSC is spontaneous and endothermic in nature. The pseudo first order, pseudo second order and intra particle diffusion kinetic models were applied to test the experimental data. The pseudo second order kinetic model provided a better correlation of the experimental data in comparison with the pseudo-first-order and intra particle diffusion models. A mechanismof fluoride adsorption associating chemisorption and physisorption processes is presented allowing the discussion of the variations in adsorption behavior between these materials in terms of specific surface area and porosity. These data suggest that chemically activated CTNSCs are promising materials for fluoride sorption.

Key words: Activated carbon, Cotton nut shell, Fluoride, Isotherm, Kinetics