期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1613, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.chroma.2019.460697
关键词
Fluoride; Phosphoric-sulfonic acid bifunctional group; Chelating resin; Sorption behavior
资金
- National Natural Science Foundation of China [21376191]
- Service Local Special Project of Shaanxi Province Education Department [141F027]
- Key Research and Development Program of Shaanxi Provincial Science and Technology Department [2018GY-079]
- Industrialization Cultivation Item of Shaanxi Province Educational Department [2013jc23]
S9570-Fe(III), a modified chelating resin containing sulphonated monophosphonic acid bifunctional groups, was used for the fluoride removal from aqueous phase for the first time. The results specified that S9570-Fe(III) exhibited better adsorption towards the fluoride ions as compared to the other commonly used chelating resins having monofunctional group such as iminodiacetic acid, sulfonic acid or carboxylic acid. Adsorption thermodynamic and kinetic studies of S9570-Fe(III) chelating resin for the fluoride also have been carried out. The thermodynamic results demonstrated that the adsorption was a spontaneous process accompanied with a gradual decrease in entropy and the low temperature was favorable for the fluoride ion adsorption. The kinetic experiments showed that the resin exhibited a rapid initial adsorption behavior and the adsorption process more complied with the pseudo-second order reaction model which indicating that the whole adsorption process was controlled by a combined mechanism of intraparticle diffusion and chemical sorption. Adsorption mechanism of S9570-Fe(III) resin for fluoride ions was predicted. The study demonstrated the effectiveness of the phosphoric-sulfonic acid bifunctional group chelating resin to remove fluoride, and provided a novel type removal method for the fluoride. (C) 2019 Elsevier B.V. All rights reserved.
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