磁性壳聚糖吸附剂的季铵盐改性及磷吸附性能

doi:10.11896/cldb.21060259

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Abstract To improve the solid-liquid separation efficiency and selective adsorption of phosphorus sorbent, magnetic CMS/CS/MAPTAC composites were prepared, using coal-fly-ash magnetic spheres (CMS) and chitosan (CS) modified by methacrylamido propyl trimethyl ammonium chloride (MAPTAC) as magnetic core and shell, respectively. Thermogravimetry analysis, X-ray diffraction, vibration sample magnetometer, scanning electron microscopy, infrared spectroscopy and X-ray photoelectron spectroscopy were employed to characterize the obtained CMS/CS/MAPTAC. It is shown that CMS is uniformly distributed in the CS matrix. MAPTAC is modified onto the surface of CS by chemical bonds. The CMS/CS/MAPTAC sample has strong magnetism up to 16.8 emu/g, which enables an efficient solid-liquid separation under an applied magnetic field. Phosphorus adsorption experiments indicate that the loading of MAPTAC on the surface of CMS/CS improves the phosphorus adsorption performance. The maximum phosphorus adsorption capacity of 50.7 mg/g was obtained under the conditions of pH=4.0 and 25 ℃. The reaction time, pH, phosphate concentration, temperature and coexisting anions have significant effects on the phosphorus adsorption. The adsorption kinetics and adsorption thermodynamics simulation suggests that the phosphorus adsorption of CMS/CS/MAPTAC conforms to the pseudo-second-order model and Langmui-iso-absorbing model. Thus, the adsorption should mainly belong to monolayer chemisorption. The CMS/CS/MAPTAC adsorbent can be recycled and reused multiple times. After 5 recycling, the phosphorus adsorption was still more than 60% of that initial sample.

Key words： magnetic adsorbent phosphorus removal coal-fly-ash magnetic sphere chitosan quaternary ammonium salt modification

Published: 10 November 2022 Online: 2022-11-03

CLC number:

X703

Fund:Natural Science Foundation of Anhui Province (1908085ME127), Research Foundation of the Institute of Environment-friendly Materials and Occupational Health (Wuhu), the Anhui University of Science and Technology (ALW2021YF11) and 2021 Anhui Province College Quality Engineering Project (2021cyxy031).

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	PENG Xujie
	LI Jianjun
	CAO Ruichang
	RONG Xin
	LI Meng
	LIU Yin

Cite this article:

PENG Xujie,LI Jianjun,CAO Ruichang, et al. Magnetic Chitosan Modified by Quaternary Ammonium Salt and Its Phosphorus Adsorption[J]. Materials Reports, 2022, 36(21): 21060259-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21060259 OR http://www.mater-rep.com/EN/Y2022/V36/I21/21060259

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