Preparation and Properties of Surface Imprinted Magnetic Cellulose Microsphere with Highly Selective Adsorption†

doi:10.7503/cjcu20160248

Abstract

Abstract:

Molecularly imprinted magnetic composite microspheres(MIP-MCM) were prepared by a surface functional monomer-directing system. Cellulose and Fe₃O₄composite microsphere was the core and then was coated a layer of MIP on the surface. Fourier transform Infrared spectra(FTIR), X-ray powder diffraction(XRD), vibrating sample magnetometry(VSM) methods were used to characterize the structure of MIP-MCM. In this article, Rhodamine B(RhB) was chosen as the template molecule. The adsorption abilities of MIP-MCM toward RhB were studied through adsorption kinetics and adsorption thermodynamics. The adsorption kinetics curves met pseudo-second-order model more. The adsorption isotherms could be described by both Langmuir and Freundlich isotherm models. The maximum adsorption amount was calculated to be 0.542 mg/mg, much higher than the common adsorbents. MIP-MCM was also adsorption-selective to RhB with highly regenerate and kept stable in a wild pH and temperature range. In brief, MIP-MCM is very potential in the application of removal of dye and sewage treatment.

Key words: Cellulose, Fe3O4, Molecularly imprinted polymer, Rhodamine B, Selective adsorption

CLC Number:

O631

TrendMD:

GE Hao,HUANG Hailong,XU Min. Preparation and Properties of Surface Imprinted Magnetic Cellulose Microsphere with Highly Selective Adsorption^†[J]. Chem. J. Chinese Universities, 2016, 37(8): 1551.

Figures/Tables 15

Scheme 1 Preparation process of MIP-MCM

Fig.1 FTIR spectra of Fe3O4(a), cellulose(b), MCM(c), NIP-MCM(d) and MIP-MCM(e)

Fig.2 XRD of MIP-MCM(a), MCM(b), cellulose(c) and Fe3O4(d)

Fig.3 SEM images of MCM(A) and MIP-MCM(B) Insets: magnifications images of (A) and (B).

Fig.4 DLS(A) and microscope image(B) of MIP-MCM

Fig.5 Hysteresis loops of the Fe3O4(a), MCM(b) and MIP-MCM(c) Inset: magnetic separation picture of MIP-MCM.

Fig.6 Adsorption kinetic of MIP-MCM(■), NIP-MCM(◆) and fitting model(—) of RhB on the MIP-MCM and NIP-MCM

Table 1 Kinetic parameters of the adsorption of RhB by MIP-MCM and NIP-MMCl

Adsorption	Q_e/ (mg·mg^-1)	Pseudo-first-order			Pseudo-second-order			α_MIP/NIP
Adsorption	Q_e/ (mg·mg^-1)	Q_e1/(mg·mg^-1)	k₁/h^-1		R²	Q_e2/(mg·mg^-1)	k₂/h^-1	R²
MIP-MCM	0.479	0.454	3.33	0.959	0.482	10.1	0.993	15.1
NIP-MCM	0.0317	0.0310	1.44	0.967	0.0336	60.2	0.989

Fig.7 Static adsorption isotherms of MIP-MCM(■) and NIP-MCM(◆)

Table 2 Langmuir and Freundlich data for the adsorption of RhB on the MIP-MCM at 25 ℃

Adsorption	Langmuir model			Freundlich model
Adsorption	Q_m/(mg·mg^-1)	b	R²	1/n	K_F	R²
MIP-MCM	0.542	6.47	0.997	0.261	0.486	0.986
NIP-MCM	0.0390	3.13	0.994	0.338	0.0285	0.960

Table 3 Kinetic parameters of the adsorption of RhB and Rh6G by MIP-MCM(*) and NIP-MCM(**)

Adsorbents	Q_c/(mg·mg^-1)	Q_e/(mg·mg^-1)
RhB	0.542^*	0.492^*	4.59
	0.0390^**	0.032^**
Rh6G	0.118^*	0.096^*
	0.0351^**	0.027^**

Fig.8 Adsorption selectivity of MIP-MCM toward different targets

Fig.9 Effect of solution pH on RhB adsorption on MIP-MCM at 298 K

Fig.10 Effect of solution temperature on RhB adsorption of MIP-MCM

Fig.11 Regeneration cycles for MIP-MCM

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