Synthesis and properties of a high-capacity iron oxide adsorbent for fluoride removal from drinking water

被引：81
作者：
Zhang, Chang [1 ]
Li, Yingzhen [1 ]
Wang, Ting-Jie [1 ]
Jiang, Yanping [1 ]
Fok, Jason [1 ]
机构：
[1] Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2017年 / 425卷
基金：
中国国家自然科学基金;
关键词：
Adsorbent; Iron oxide; Fluoride removal; Ethanol treatment; Drinking water; HYDROXYCARBONATE GREEN RUST; AQUEOUS-SOLUTION; ADSORPTION MECHANISM; EFFICIENT REMOVAL; ARSENIC REMOVAL; NANO-ADSORBENT; DEFLUORIDATION; IONS; PHOSPHATE; TRANSFORMATION;
D O I：
10.1016/j.apsusc.2017.06.159
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：272 / 281
页数：10
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