期刊
JOURNAL OF FLUORINE CHEMISTRY
卷 141, 期 -, 页码 29-34出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2012.05.022
关键词
Protonated cross-linked chitosan particles; Flouride; Adsorption; Isotherm
资金
- National Natural Science Foundation of China Project [51003086]
- National Higher Education Institution General Research and Development Project
Protonated cross-linked chitosan particles (PCP) were used to remove fluoride from aqueous solution. PCP were characterized using FTIR, XRD and SEM. Adsorption isotherms, the effects of adsorbent dosage, pH, contact time and co-existing anions on adsorption process, and the regeneration ability of PCP were investigated. The optimum pH value was achieved at 7. The equilibrium was attained in 40 min. The presence of co-existing anions weakened fluoride adsorption on PCP, especially the high valence anions such as sulfate. The equilibrium data fitted well with Langmuir and Freundlich isotherm models, and the maximum monolayer adsorption capacity was 8.10 mg g(-1) at room temperature. 0.1 M HCI was identified as the best eluent. Electrostatic attraction was the main driving force for fluoride adsorption. (c) 2012 Elsevier B.V. All rights reserved.
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