期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 181, 期 -, 页码 810-823出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.04.079
关键词
Grafted magnetic chitosan microspheres; Cationic dyes; Adsorption isotherms
资金
- National Natural Science Foundation of China [21805249]
- Shanxi Province Science and Technology Foundation [201801D121069]
- Shanxi Scholarship Council of China [2020-100]
A novel adsorbent with high adsorption capacity for cationic dyes was synthesized by graft polymerization of sodium 4-styrene sulfonate on the surface of magnetic chitosan microspheres. The adsorption performance was influenced by various experimental conditions, and the maximum adsorption capacity was found to be 989 mg/g at pH 1 and 25 degrees C. The grafted microspheres showed excellent adsorption capacity for methylene blue in aqueous solution.
A novel adsorbent with high adsorption capacity to remove cationic dyes was synthesized. Sodium 4-styrene sulfonate (SSS) was grafted polymerization on the surface of magnetic chitosan microspheres via -NH2/S2O82- surface initiating system, obtaining MCS-g-PSSS microspheres. The grafted microsphere was characterized by Fourier transforms infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometer and the Brunauer-Emmett-Teller. Cationic dyes were adsorbed by MCS-g-PSSS and methylene blue(MB) was acted as a typical example. The adsorption performance was explored by varying experimental conditions. The results showed the maximal adsorption capacity was 989 mg/g at pH 1 at 25 degrees C. The pseudo-second order model was found to be applicable for the adsorption kinetics. The adsorption capacity increased with rising temperature and it decreased owing to adding of ions. The adsorption isotherms were the best fitted by Langmuir. MCS-g-PSSS for MB showed high adsorption capacity due to the strong electrostatic interactions and stacking, which was explained by FTIR and XPS and was verified by DFT calculations. The degree of adsorption spontaneity increased with rising the temperature. The grafted MCS-g-PSSS microspheres had high adsorption capacity for various kinds of cationic dyes and excellent for remove MB in the aqueous solution. (C) 2021 Elsevier B.V. All rights reserved.
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