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

Lanthanum alginate bead is a new, highly active adsorbent. In the present study, we investigated its ad- sorption 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...

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Bibliographic Details
Published in:Chinese journal of chemical engineering 2011-06, Vol.19 (3), p.365-370
Main Author: 霍亚坤 丁文明 黄霞 徐静年 赵梦华
Format: Article
Language:English
Subjects:
adsorbent characterization
adsorption mechanism
fluoride removal
ion exchange
Langmuir模型
lanthanum alginate
吸附剂
吸附机理
扫描电镜观察
表征
褐藻胶
镧
除氟
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Summary:Lanthanum alginate bead is a new, highly active adsorbent. In the present study, we investigated its ad- sorption 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.
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(09)60222-6