Preparation and Characterization of Magnetic PS-DEA Resins†

doi:10.7503/cjcu20131037

Abstract

Abstract:

The hydrophilic PS-DEA resins were prepared by diethanolamine(DEA) for the surface modifier of chloromethylation polystyrene resins(PS-Cl). In-situ magnetic PS-DEA composites were prepared by co-precipitation method with FeCl₃·6H₂O and FeSO₄·7H₂O as precursors. The morphology, structure and magnetic properties of the magnetic PS-DEA samples were characterized. The adsorption properties of PS-DEA and magnetic PS-DEA for Hg(Ⅱ) in aqueous solution were investigated by batch methods. The results showed that the magnetic PS-DEA with magnetic Fe₃O₄ were prepared. The saturation magnetization(M_s) of the magnetic PS-DEA was 0.92 A·m²/kg, and the Fe₃O₄ contents of the magnetic PS-DEA were 1.7%(mass fraction). The adsorption data of PS-DEA and magnetic PS-DEA for Hg(Ⅱ) in aqueous solution were fitted using Langmuir isothermal model, respectively. The maximum adsorption capacities of PS-DEA and magnetic PS-DEA for Hg(Ⅱ) were 320.51 and 352.11 mg/g, respectively, which demonstrated that the adsorption property of the PS-DEA resin was improved after introducing the magnetic nanoparticles. The obtained magnetic PS-DEA could be used as a promising magnetic adsorbent in waste water treatment.

Key words: Diethanolamine, Chloromethylation polystyrene resin, Co-precipitation method, Magnetic PS-DEA

CLC Number:

O631
O614

TrendMD:

LU Cuiping, MA Yingxia, WANG Rujuan, CHEN Ying, DU Xueyan. Preparation and Characterization of Magnetic PS-DEA Resins^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 858.

Figures/Tables 8

Scheme 1 Preparation of magnetic PS-DEA

Fig.1 Digital photographs(A, B) and SEM images(C, D) of PS-DEA(A, C) and magnetic PS-DEA(B, D)

Fig.2 EDS of cross-section(A) and outer surface(B) of magnetic PS-DEA Insets are SEM images.

Fig.3 FTIR spectra of PS-DEA(a) and magnetic PS-DEA(b)

Fig.4 XRD patterns of Fe3O4(a) and magnetic PS-DEA(b)

Fig.5 XPS spectra of magnetic PS-DEA before(a) and after(b) adsorption

Fig.6 Magnetization curve(A), coercivity and remanence(B) and magnetic separation from aqueous solution(C) of magnetic PS-DEA

Table 1 Isotherm model of Langmuir for adsorption Hg(Ⅱ) onto PS-DEA and magnetic PS-DEA

Parameter	Equation	Q_max/(mg·g^-1)	K_L/(L·mg^-1)	R²
PS-DEA	c_e/Q_e=0.1793+0.0031c_e	320.51	0.015	0.9793
Magnetic PS-DEA	c_e/Q_e=0.0835+0.0028c_e	352.11	0.017	0.9526

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