期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 171, 期 1-3, 页码 774-779出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.06.079
关键词
Fluoride; Adsorption; Granular ferric hydroxide; pH; Ionic strength; XPS
资金
- Environmental Research Center (ERC) at Missouri University of Science and Technology
- China Scholarship Council
- University of Missouri Research Board [RBJ61]
Fluoride adsorption onto granular ferric hydroxide (GFH) was investigated using batch methods, under various ionic strength, pH,surface loading,and major co-existing anion conditions. Adsorption of fluoride on GFH included an initial fast adsorption phase followed by a slow adsorption phase. Within the pH range of 2-11, fluoride adsorption equilibrium was not affected by ionic strength, but was significantly affected by pH. Maximum adsorption was achieved in the pH range of 3-6.5. Under the same pH condition, fluoride adsorption followed the Freundlich isotherm, indicating that the GFH surface was heterogeneous. X-ray photoelectron spectroscopy (XPS) and attenuated total reflection-infrared (ATR-IR) spectroscopy data showed evidence for fluoride sorption on the GFH surface via inner-sphere complexation accompanying increased hydrogen bonding and surface hydroxylation. Major anions, including phosphate, bicarbonate, sulfate, and chloride, reduced fluoride adsorption in the following order: H2PO4- > HCO3- > SO42- > Cl-. (c) 2009 Elsevier B.V. All rights reserved.
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