期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 18, 页码 12041-12050出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00817d
关键词
-
资金
- National Natural Science Foundation of China (NSFC) [21407129]
- Beijing National Science Foundation [8144053]
The adsorption of fluoride from aqueous solutions onto an Fe-impregnated chitosan (Fe-CTS) granular adsorbent was studied, and the adsorption capacity was determined to be 1.9736 mg g(-1) at an initial fluoride concentration of 10 mg L-1. The effects of the initial fluoride concentration, dosage, and temperature were investigated using factorial design and analysis. The results indicated that high initial fluoride concentrations, low dosages, and low temperatures could enhance the fluoride adsorption capacity. In addition, Fe-CTS exhibited high selectivity for fluoride removal in the presence of high levels of several coexisting anions (nitrate, chloride, bicarbonate, and phosphate), except carbonate and sulfate. The adsorption process followed the Langmuir model at low fluoride concentrations and the Freundlich model at high initial fluoride concentrations. The data also fit the pseudo-second-order model. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and extended X-ray absorption fine-structure (EXAFS) spectroscopy were used to elucidate the adsorption mechanism. The FTIR and EXAFS analyses revealed that Fe was chelated with -NH2 and -OH groups on the CTS, and fluoride adsorption on the Fe-CTS occurred due to ion exchange between chloride and fluoride. Highlights: a granular Fe-impregnated chitosan (Fe-CTS) adsorbent was synthesized via chelation of Fe ions to -OH and -NH2 groups of CTS. The Fe-CTS granular adsorbent exhibited high performance for the adsorption of fluoride. The mechanism of fluoride adsorption on Fe-CTS was elucidated using EXAFS and FTIR analyses. Fluoride adsorption on Fe-CTS occurred via ion exchange between chloride and fluoride.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据