期刊
CHINESE CHEMICAL LETTERS
卷 32, 期 11, 页码 3410-3415出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.04.057
关键词
Fluoride ion; Zirconium alginate; Sulfate; Adsorption capacity; Ion exchange
资金
- Natural Science Foundation of Tianjin [18JCYBJC17700]
- National Natural Science Foundation of China [21406164, 21466035, 22066022]
The study presented millimeter-sized sulfate-type zirconium alginate hydrogel beads with high adsorption capacity and wide pH applicability, showing potential application in treating fluoride-containing groundwater. The ion exchange process between SO42- and F- in the material was energetically favorable, as verified through various analytical techniques.
It is still a challenge to eliminate efficiently fluoride ion from groundwater, especially to design and synthesis an adsorbent possessing high adsorption capacity, recyclability and wide pH application conditions. Herein we present millimeter-sized sulfate-type zirconium alginate hydrogel beads with 3D network structure (AHB@Zr-SO42-) that exhibited a maximum adsorption capacity of 101.3 mg/g with wide pH applicability (pH 3-9). This material have similar to 2.5 times higher adsorption capacity than that of pure zirconium alginate hydrogel beads (AHB@Zr) and it was ascribed to ion exchange between SO42- and F- on the surface of AHB@Zr-SO42-, which was verified via ion chromatography measurement coupled with X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectrometer (FTIR Spectrometer) analysis. Density functional theory (DFT) calculations indicated that the ion exchange process between SO42- and F- in AHB@Zr-SO42- was energetically favorable than OH- and F- in AHB@Zr. In addition, 310 bed volumes (BV) of effluent was realized via column adsorption of groundwater containing fluoride on AHB@Zr-SO42- and indicated that it is a promising candidate for mitigating the problem of fluoride-containing groundwater. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
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