CIESC Journal ›› 2011, Vol. 19 ›› Issue (3): 365-370.

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Fluoride Removal by Lanthanum Alginate Bead: Adsorbent Characterization and Adsorption Mechanism

霍亚坤1, 丁文明1, 黄霞2, 徐静年1, 赵梦华1   

  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:2011-04-09 出版日期:2011-06-28 发布日期:2011-06-28
  • 通讯作者: DING Wenming, E-mail: dingwm@mail.buct.edu.cn
  • 基金资助:
    Supported by the Major National Science and Technology Special Project on Treatment and Control of Water Pollution(2009ZX07425-006);State Key Laboratory of Environmental Simulation and Pollution Control (09K04ESPCT)

Fluoride Removal by Lanthanum Alginate Bead: Adsorbent Characterization and Adsorption Mechanism

HUO Yakun1, DING Wenming1, HUANG Xia2, XU Jingnian1, ZHAO Menghua1   

  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:2011-04-09 Online:2011-06-28 Published:2011-06-28
  • Supported by:
    Supported by the Major National Science and Technology Special Project on Treatment and Control of Water Pollution(2009ZX07425-006);State Key Laboratory of Environmental Simulation and Pollution Control (09K04ESPCT)

摘要: Lanthanum alginate bead is a new, highly active adsorbent. In the present study, we investigated its adsorption performance and its adsorption mechanism. The adsorption isotherm for fluoride onto lanthanum alginate b ead fits the Langmuir model well, and the maximum adsorption capacity is 197.2 mg·g-1. X-ray diffraction shows the amorphous nature of lanthanum alginate bead, which allows for better accessibility to fluoride and thus better activity. Infrared spectra of lanthanum alginate bead before and after adsorption confirm its stable skeletal structure. Scanning electron microscopy shows that the dense surface structure of the adsorbent appear cracks after adsorption. T he adsorption mechanism of lanthanum alginate bead is considered as an ion exchange between F- and Cl- or OH-, as verified from the adsorbent and the solution by pH effect, energy dispersive X-ray, and ion chromatography.

关键词: lanthanum alginate, fluoride removal, adsorbent characterization, adsorption mechanism, ion exchange

Abstract: Lanthanum alginate bead is a new, highly active adsorbent. In the present study, we investigated its adsorption performance and its adsorption mechanism. The adsorption isotherm for fluoride onto lanthanum alginate b ead fits the Langmuir model well, and the maximum adsorption capacity is 197.2 mg·g-1. X-ray diffraction shows the amorphous nature of lanthanum alginate bead, which allows for better accessibility to fluoride and thus better activity. Infrared spectra of lanthanum alginate bead before and after adsorption confirm its stable skeletal structure. Scanning electron microscopy shows that the dense surface structure of the adsorbent appear cracks after adsorption. T he adsorption mechanism of lanthanum alginate bead is considered as an ion exchange between F- and Cl- or OH-, as verified from the adsorbent and the solution by pH effect, energy dispersive X-ray, and ion chromatography.

Key words: lanthanum alginate, fluoride removal, adsorbent characterization, adsorption mechanism, ion exchange