Preparation of Hierarchically Structured AOPAN@Mg(OH)2 Composite Nanofibrous Membrane and Cr(Ⅵ)-removal Capacity†

doi:10.7503/cjcu20160217

Abstract

Abstract:

The hierarchial aminated polyacrylonitrile(AOPAN)@Mg(OH)₂ composite nanofibrous membrane was obtained by electrospinning technique and surface modification with hydroxylamine chloride prior to hydrothermal method. The composite nanofibrous membranes were characterized by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), X-ray diffraction(XRD) and transmission electron microscope(TEM) to confirm the formation of Mg(OH)₂ nanoparticles on the AOPAN nanofibers. The results revealed that 40 ℃/7 h was the best hydrothermal condition and Mg(OH)₂ nanoparticles were effectively loaded on the surface of AOPAN nanofibrous membrane. The adsorption process showed pH dependence and the maximum Cr(Ⅵ) adsorption occurred at pH=2. The Langmuir adsorption model described well the experimental adsorption data and estimated a maximum loading capacity of 123.5 mg/g. This is mainly due to the protonation of —NH₂ groups and Mg(OH)₂ nanoparticles under the acid condition, which is benefit for adsorbing HCr $O 4 -$ . The kinetics studies indicated that the adsorption equilibrium was attained after 5 h and the experimental data followed the pseudo-second order model. Meanwhile, the AOPAN@Mg(OH)₂ composite nanofibrous membrane can be easily separated from liquid solutions and shows excellent cyclic utilization performance. The composite membrane maintained over 50% removal rate after rinsing with dilute NaOH solution by four cycles. Therefore, the AOPAN@Mg(OH)₂ composite nanofibrous membrane could be a good candidate for removing Cr(Ⅵ) from wastewater, and the study provides a simple and effective route for the development of new environmental remediation nanomaterials.

Key words: Electrospinning, Composite nanofibrous membrane, Hierarchical structure, Hexavalent chromium, Polyacrylonitrile

CLC Number:

O632.62

TrendMD:

ZHANG Fan, WANG Bin, WANG Jiaona, LI Xiuyan, LI Congju. Preparation of Hierarchically Structured AOPAN@Mg(OH)₂ Composite Nanofibrous Membrane and Cr(Ⅵ)-removal Capacity^†[J]. Chem. J. Chinese Universities, 2016, 37(11): 2117.

Figures/Tables 11

Scheme 1 Reaction of hydroxylamine hydrochloride with PAN nitrile group

Fig.1 SEM images of AOPAN nanofibrous membranes with different hydrothermal timeTime/h: (A) 0; (B) 1; (C) 3; (D) 5; (E) 7; (F) 9 h. Inset of (A): photo of the AOPAN nanofibrous membrane; inset of (E): photo of AOPAN@Mg(OH)2 composite nanofibrous membrane.

Fig.2 FTIR spectra for PAN nanofibrous membrane(a), AOPAN nanofibrous membrane(b) and AOPAN@Mg(OH)2 composite nanofibrous membrane(c)

Fig.3 TEM image of AOPAN@Mg(OH)2 composite nanofibrous nanofibers

Fig.4 XRD patterns for PAN fibers(a), AOPAN fibers(b) and AOPAN@Mg(OH)2 compo-site nanofibrous membranes with hydrothermal time of 3 h(c) and 7 h(d)

Fig.5 Adsorbing Cr(Ⅵ) capacity of AOPAN@Mg(OH)2 composite nanofibrous membranes with different hydrothermal time at pH=2

Fig.6 Change of the total Cr(Ⅵ) in AOPAN nanofiber(a) and AOPAN@Mg(OH)2 nanofiber(b) solution with time at pH=2(A), pseudo-frist-order plot(B) and pseudo-second-order plot(C) for adsorption of Cr(Ⅵ) onto the AOPAN@Mg(OH)2 composite nanofibrous membrane

Fig.7 Relationship between concentration of Cr(Ⅵ) and adsorption capacity at pH=2(A) and equilibrium adsorption isotherm of Cr(Ⅵ) fitted with Langmuir adsorption model(B)a. AOPAN; b. AOPAN@Mg(OH)2.

Fig.8 Recyclable property of AOPAN@Mg(OH)2

Fig.9 SEM images of AOPAN@Mg(OH)2 composite nanofibrous membrane(A) and the AOPAN@Mg(OH)2 composite nanofibrous membrane(B) washed by 0.1 mol/L NaOH solutions

Fig.10 Mechanism illustration for the adsorption of Cr(Ⅵ) on the surface of AOPAN@Mg(OH)2 composite nanofibrous membrane

References 24

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Preparation of Hierarchically Structured AOPAN@Mg(OH)₂ Composite Nanofibrous Membrane and Cr(Ⅵ)-removal Capacity^†

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