Structure and Adsorption Property of Magnetic ZnFe2O4-halloysite Composite Material

doi:10.15541/jim20170244

Abstract

Abstract:

Magnetic ZnFe₂O₄/halloysite composite (MHNTs) was synthesized by Sol-Gel process and its sorption behavior towards methylene blue (MB) was studied. Structure, morphology and magnetic property of MHNTs were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), fourier transfer infrared (FT-IR), and vibrating sample magnetometer (VSM). Static batch equilibrium method was used to investigate the adsorption behavior and mechanism of MB on MHNTs. The results show that ZnFe₂O₄ composites with 10~30 nm spinel type nanoparticles are well loaded on the surface of HNTs. The average grain size of nano-ZnFe₂O₄ is 19.1 nm calculated by Scherrer equation．MHNTs exhibit good paramagnetic and magnetic recovery properties. MB sorption of MHNTs follows pseudo-second order kinetic model and Langmuir thermodynamics model. MB sorption process is strongly affected by temperature, and higher temperature is beneficial for the adsorption of MB by MHNTs. Furthermore, MHNTs can be recovered effectively by magnetic field and the adsorption properties of MHNTs on 10 mg/L MB solutions hardly decreased after 5 times of repeated use.

Key words: ZnFe₂O₄, halloysite nanotubes, MB, adsorption, dynamics, thermodynamics

CLC Number:

TB332

SUN Qing, QI Qi, ZHANG Jian, PAN Fang-Zhen, SHENG Jia-Wei. Structure and Adsorption Property of Magnetic ZnFe₂O₄-halloysite Composite Material[J]. Journal of Inorganic Materials, 2018, 33(4): 390-396.

Figures/Tables 11

Fig. 1 XRD patterns of MHNTs (a), ZnFe2O4 (b) and HNTs(c)

Fig. 2 Low magnification (a) and high magnification (b) TEM images of MHNTs

Fig. 3 VSM curve of MHNTs

Fig. 4 Adsorption of MHNTs by external magnetic field

Fig. 5 FT-IR spectra of HNTs and MHNTs

Fig. 6 Effect of MHNTs dosage on adsorption towards MB

Fig. 7 Effect of contact time on the adsorption towards MB on MHNTs and the pseudo-second order rate equation fit of MB

Fig. 8 Adsorption isotherms of MHNTs towards MB at different temperatures

Fig. 9 Langmuir (a) and Freundlich (b) isotherms of MB adsorption on MHNTs at different temperatures

Table 1 Parameters for Langmuir and Freundlich isotherms of MB adsorption on MHNTs at different temperatures

T/℃	Langmuir			Freubdlich
T/℃	Q_m	K_L	R²	K_F	n	R²
20	23.47	0.73	0.992	3.43	13.47	0.963
35	23.19	1.29	0.987	3.71	34.43	0.961
50	28.40	0.19	0.985	3.47	11.05	0.948

Fig. 10 Influence of reuse times on the adsorption of MB by MHNTs

References 29

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Structure and Adsorption Property of Magnetic ZnFe₂O₄-halloysite Composite Material

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