期刊
APPLIED SURFACE SCIENCE
卷 425, 期 -, 页码 272-281出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.06.159
关键词
Adsorbent; Iron oxide; Fluoride removal; Ethanol treatment; Drinking water
类别
资金
- National High Technology Research and Development Program (863 Program) [2012AA062605]
- National Natural Science Foundation of China (NSFC) [21176134]
A novel iron oxide adsorbent with a high fluoride adsorption capacity was prepared by a facile wet-chemical precipitation method and ethanol treatment. The ethanol-treated adsorbent was amorphous and had a high specific surface area. The adsorption capacity of the treated adsorbent was much higher than that of untreated adsorbent. The Langmuir maximum adsorption capacity of the adsorbent prepared at a low final precipitation pH (<= 9.0) and treated with ethanol reached 60.8 mg/g. A fast adsorption rate was obtained, and 80% of the adsorption equilibrium capacity was achieved within 2 min. The adsorbent had high fluoride-removal efficiency for water in a wide initial pH range of 3.5-10.3 and had a high affinity for fluoride in the presence of common co-anions. The ethanol treatment resulted in structure transformation of the adsorbent by inhibiting the crystallization of the nano-precipitates. The adsorption was confirmed to be ion exchange between fluoride ions and the hydroxyl groups on the adsorbent surface. (C) 2017 Published by Elsevier B.V.
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