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

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

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. 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. 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/Abstract

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

霍亚坤, 丁文明, 黄霞, 徐静年, 赵梦华. Fluoride Removal by Lanthanum Alginate Bead: Adsorbent Characterization and Adsorption Mechanism[J]. , 2011, 19(3): 365-370.

HUO Yakun, DING Wenming, HUANG Xia, XU Jingnian, ZHAO Menghua. Fluoride Removal by Lanthanum Alginate Bead: Adsorbent Characterization and Adsorption Mechanism[J]. , 2011, 19(3): 365-370.

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

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

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