CIESC Journal ›› 2011, Vol. 19 ›› Issue (4): 581-585.

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Isotherm Equation Study of F Adsorbed from Water Solution by Fe2(SO4)3-modified Granular Activated Alumina

党丹1, 丁文明1, 程安国1, 刘书明2, 张旭2   

  1. 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2. School of Environment, Tsinghua University, Beijing 100084, China
  • 收稿日期:2010-11-23 修回日期:2011-05-21 出版日期:2011-08-28 发布日期:2011-08-28
  • 通讯作者: DING Wenming,E-mail:dingwm@mail.buct.edu.cn
  • 基金资助:
    ence Foundation of China(20736003,20906056),the National High Technology Research and Development Program ofSupported by the Major National Science and Technology Special Project on Treatment and Control of Water Pollution (2009ZX07425-006),and the State Key laboratory of Environmental Simulation and Pollution Control(09K04ESPCT).

Isotherm Equation Study of F Adsorbed from Water Solution by Fe2(SO4)3-modified Granular Activated Alumina

DANG Dan1, DING Wenming1, CHENG Anguo1, LIU Shuming2, ZHANG Xu2   

  1. 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2. School of Environment, Tsinghua University, Beijing 100084, China
  • Received:2010-11-23 Revised:2011-05-21 Online:2011-08-28 Published:2011-08-28
  • Supported by:
    ence Foundation of China(20736003,20906056),the National High Technology Research and Development Program ofSupported by the Major National Science and Technology Special Project on Treatment and Control of Water Pollution (2009ZX07425-006),and the State Key laboratory of Environmental Simulation and Pollution Control(09K04ESPCT).

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摘要： The adsorption equilibrium of a fluoride solution on 1-2 mm granular activated alumina modified by Fe2(SO4)3-solution was investigated.The experiments were conducted using a wide range of initial fluoride concentrations(0.5 to 180 mg·L-1 at pH～7.0) and an adsorbent dose of 1.0 g·L-1.The application of Langmuir and Freundlich adsorption isotherm models(linear and nonlinear forms) generally showed that a single Langmuir or Freundlich equation cannot fit the entire concentration gap.Experimental data on low equilibrium concentrations(0.1 to 5.0 mg·L-1) was in line with both Langmuir and Freundlich isotherm models, whereas that of high equilibrium concentrations(5.0 to 150 mg·L-1) was more in line with the Freundlich isotherm model.A new LangmuirFreundlich function was used for the entire concentration gap, as well as for low and high concentrations.

关键词: isotherm equation, Fe2(SO4)3-modified, granular activated alumina

Abstract: The adsorption equilibrium of a fluoride solution on 1-2 mm granular activated alumina modified by Fe2(SO4)3-solution was investigated.The experiments were conducted using a wide range of initial fluoride concentrations(0.5 to 180 mg·L-1 at pH～7.0) and an adsorbent dose of 1.0 g·L-1.The application of Langmuir and Freundlich adsorption isotherm models(linear and nonlinear forms) generally showed that a single Langmuir or Freundlich equation cannot fit the entire concentration gap.Experimental data on low equilibrium concentrations(0.1 to 5.0 mg·L-1) was in line with both Langmuir and Freundlich isotherm models, whereas that of high equilibrium concentrations(5.0 to 150 mg·L-1) was more in line with the Freundlich isotherm model.A new LangmuirFreundlich function was used for the entire concentration gap, as well as for low and high concentrations.

Key words: isotherm equation, Fe2(SO4)3-modified, granular activated alumina

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