Investigation of Performances and Mechanism of Fluoride Removal by Fe（Ⅲ）-Loaded Ligand Exchange Cotton Cellulose Adsorbent

• Published in: Wuhan University journal of natural sciences Vol. 10; no. 5; pp. 936 - 940
• Main Author: ZHAO Ya-ping LI Xiu-yan LIU Lu CHEN Fu-hua
• Format: Journal Article
• Language: English
• Published: 2005
• Subjects: 吸附装置; 地下水; 氟化物; 水体污染; 配合基; 防治方法
• ISSN: 1007-1202; 1993-4998

Novel adsorbent, Fe（Ⅲ）-loaded ligand exchange cotton cellulose adsorbent [Fe（Ⅲ） LECCA], was used to in vestigate the adsorption performances and mechanism of fluoride removal from aqueous solutions. The adsorbent was found to adsorb fluoride rapidly and effectively. The fluoride removal was influenced by pH. Adsorption mode followed first-order reaction at different temperature, theapparent adsorption activated energy Ea was 6.37 kJ·mol^-1, and adsorption enthalpy △H was 5.35 kJ·mol^-1. The adsorption enfluoride on adsorbent was 3.2 mmol·g^-1 （dry weight）. The maximal integer coordination ratio of fluoride with Fe（Ⅲ） LECCA was 3：1. The ligand exchange mechanism of adsorption was elucidated through chemical methods and IR spectral analysis.