In this work, enhanced chitosan/bentonite composite was prepared by treating chitosan/bentonite composite with concentrated hydrochloric acid (HCl). The adsorption of fluoride ions from aqueous solution onto the enhanced chitosan/bentonite composite was investigated. Adsorption studies were performed in a batch system, and the effects of various parameters, such as the pH value of the solution, adsorbent dosage and initial fluoride concentration, were evaluated. The optimum operating conditions for fluoride removal by the enhanced chitosan/bentonite composite were pH = 7 or so, and adsorbent dosage =1.2 g. Increasing initial fluoride concentration reduced the adsorption of fluoride onto the enhanced chitosan/bentonite composite. Furthermore, the presence of other co-anions weakened the adsorption of fluoride onto this adsorbent. The equilibrium adsorption isotherms were well described by both the Freundlich and Langmuir models. The maximum monolayer adsorption capacity was 2.95 mg/g at 293 K.
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Research Article|
October 19 2013
Adsorption of fluoride from aqueous solution by enhanced chitosan/bentonite composite
Qian Liu;
Qian Liu
1College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China
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Ruihua Huang;
1College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China
E-mail: huangrh20022002@aliyun.com
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Bingchao Yang;
Bingchao Yang
2Xi'an Institute of Geology and Mineral Resources, Xi'an, Shaanxi 710054, China
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Yanping Liu
Yanping Liu
1College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China
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Water Sci Technol (2013) 68 (9): 2074–2081.
Article history
Received:
April 27 2013
Accepted:
July 01 2013
Citation
Qian Liu, Ruihua Huang, Bingchao Yang, Yanping Liu; Adsorption of fluoride from aqueous solution by enhanced chitosan/bentonite composite. Water Sci Technol 1 November 2013; 68 (9): 2074–2081. doi: https://doi.org/10.2166/wst.2013.456
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