Preparation of Magnetic Amino Acid-Functionalized Aluminum Alginate Gel Polymer and its Super Adsorption on Azo Dyes

doi:10.11901/1005.3093.2021.163

Chinese Journal of Materials Research

2022, Vol. 36

Issue (3): 220-230 DOI: 10.11901/1005.3093.2021.163

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Preparation of Magnetic Amino Acid-Functionalized Aluminum Alginate Gel Polymer and its Super Adsorption on Azo Dyes

SHEN Yanlong, LI Beigang(

)

College of Chemistry and Environmental Science of Inner Mongolia Normal University, Inner Mongolia Key Laboratory of Environmental Chemistry, Hohhot 010022, China

Cite this article:

SHEN Yanlong, LI Beigang. Preparation of Magnetic Amino Acid-Functionalized Aluminum Alginate Gel Polymer and its Super Adsorption on Azo Dyes. Chinese Journal of Materials Research, 2022, 36(3): 220-230.

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Abstract

A novel magnetic amino acid functionalized aluminum alginate gel polymer Gly/Al/SA@Fe₃O₄ was prepared via droplet polymerization technique with sodium alginate (SA) as raw material, which was crosslinked with Al(Ⅲ) ions, while glycine (Gly) and Fe₃O₄ were simultaneously added. The prepared Gly/Al/SA@Fe₃O₄ was characterized by means of scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), Fourier infrared spectroscopy (FT-IR), X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM). Its absorption performance for azo dyes was also investigated. The results show that Gly/Al/SA@Fe₃O₄ is a kind of three-dimensional network-like polymer particles with a fancy fold structure on the surface, and its magnetic response ability is good. Gly/Al/SA@Fe₃O₄ shows strong adsorption performance with high adsorption rate for Direct Black 19(DB 19) and Direct Brown 2(DB 2) dyes in water. The dynamic equilibrium adsorption capacities reached 2500 mg/L and 3126 mg/L, respectively for the above two dyes in 15min and 60 min. The adsorption process can be described by a quasi-second-order rate equation, and the isothermal adsorption data conform to Langmuir model. The interaction between the adsorbents and dye molecules was synergistic through electrostatic adsorption, hydrogen bonding, ligand exchange and chemisorption. Gly/Al/SA@Fe₃O₄ particles are green and environment-friendly, and have strong water purification ability for wastewater containing high concentration azo dye, therefore, it can be used for rapid solid-liquid separation with magnetic field.

Key words: organic polymer materials magnetic amino acid-functionalized aluminum alginate droplet polymerization azo dyes adsorption

Received: 05 March 2021

ZTFLH:

O150.4540

Fund: National Natural Science Foundation of China(21167011);Natural Science Foundation of Inner Mongolia Autonomous Region(2020LH02009);Inner Mongolia Autonomous Region Water Environment Safety Collaborative Innovation Cultivation Center Project(XTCX003)

About author: LI Beigang, Tel: 13644715566, E-mail: libg@imnu.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.163 OR https://www.cjmr.org/EN/Y2022/V36/I3/220

Fig.1 Chemical structures of two azo dyes (a) DB 19, (b) DB 2

Fig.2 Effect of the mass concentration on the properties of SA (a), Gly (b), Fe₃O₄ (c) and Al(Ⅲ) (d)

Fig.3 SEM images of SA (a) and Gly/Al/SA@Fe₃O₄ (b) and EDS analytical results of element distribution of Gly/Al/SA@Fe₃O₄ (c~g)

Table 1 EDS element analysis results of SA and Gly/Al/SA@Fe₃O₄(%, mass fraction)

Fig.4 XRD patterns (a), FT-IR patterns (b) and Magnetic hysteresis loop of Gly/Al/SA@Fe₃O₄ (c)

Fig.5 Adsorption kinetics of dyes by Gly /Al/SA @Fe₃O₄ (a) DB 19, (b) DB 2

Table 2 Kinetic fitting parameters of dyes adsorption on Gly/Al/SA@Fe₃O₄ at different temperature

Fig.6 Adsorption isotherms of dyes by Gly/Al/SA@Fe₃O₄

Table 3 Fitting parameters of isothermal data of dye adsorption on Gly/Al/SA@Fe₃O₄ by two models at 298 K

Fig.7 Effect of Gly/Al/SA@Fe₃O₄ dosage on the adsorbent properties (a) DB 19, (b) DB 2

Fig.8 Effect of initial dye concentration on the adsorbent properties (a) DB 19, (b) DB 2

Fig.9 Effect of pH on adsorption performance (a) and FT-IR spectra and XPS spectra of Gly/Al/SA@Fe₃O₄ before and after adsorption (b, c)

Fig.10 XPS spectra of Al2p、O1s、Fe2p of Gly/Al/SA@Fe₃O₄ before and after adsorption

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