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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

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Front. Mater. Sci.    2016, Vol. 10 Issue (1) : 56-65    https://doi.org/10.1007/s11706-016-0320-5
RESEARCH ARTICLE
Properties of poly(1-naphthylamine)/Fe3O4 composites and arsenic adsorption capacity in wastewater
Minh Thi TRAN1,*(),Thi Huyen Trang NGUYEN1,Quoc Trung VU2,Minh Vuong NGUYEN3
1. Faculty of Physics, Hanoi National University of Education, 136-Xuanthuy Street, Caugiay District, Hanoi, Vietnam
2. Faculty of Chemistry, Hanoi National University of Education, 136-Xuanthuy Street, Caugiay District, Hanoi, Vietnam
3. Department of Physics, Quynhon University, 170 An Duong Vuong, Quynhon, Vietnam
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Abstract

The research results of poly(1-naphthylamine)/Fe3O4 (PNA/Fe3O4) nanocomposites synthesized by a chemical method for As(III) wastewater treatment are presented in this paper. XRD patterns and TEM images showed that the Fe3O4 grain size varied from 13 to 20 nm. The results of Raman spectral analysis showed that PNA participated in part of the PNA/Fe3O4 composite samples. The grain size of PNA/Fe3O4 composite samples is about 25--30 nm measured by SEM. The results of vibrating sample magnetometer measurements at room temperature showed that the saturation magnetic moment of PNA/Fe3O4 samples decreased from 63.13 to 43.43 emu/g, while the PNA concentration increased from 5% to 15%. The nitrogen adsorption--desorption isotherm of samples at 77 K at a relative pressure P/P0 of about 1 was studied in order to investigate the surface and porous structure of nanoparticles by the BET method. Although the saturation magnetic moments of samples decreased with the polymer concentration increase, the arsenic adsorption capacity of the PNA/Fe3O4 sample with the PNA concentration of 5% is better than that of Fe3O4 in a solution with pH= 7. In the solution with pH>14, the arsenic adsorption of magnetic nanoparticles is insignificant.
Keywords poly(1-naphthylamin)/Fe3O4 nanocomposite      magnetization      arsenic adsorption     
Corresponding Author(s): Minh Thi TRAN   
Online First Date: 12 January 2016    Issue Date: 15 January 2016
 Cite this article:   
Minh Thi TRAN,Thi Huyen Trang NGUYEN,Quoc Trung VU, et al. Properties of poly(1-naphthylamine)/Fe3O4 composites and arsenic adsorption capacity in wastewater[J]. Front. Mater. Sci., 2016, 10(1): 56-65.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0320-5
https://academic.hep.com.cn/foms/EN/Y2016/V10/I1/56
Sample Weight /g
Fe3O4 PNA
Fe3O4 20 0
M0 0 3.0
M1 20 1.0
M2 20 2.0
M3 20 3.0
Tab.1  Compositions of Fe3O4, M0, M1, M2 and M3 samples
Fig.1  XRD patterns of Fe3O4 and M1.
Fig.2  TEM image of M3.
Fig.3  SEM images of PNA/Fe3O4: (a) M1; (b) M2.
Fig.4  (a) Ramman spectra of M3 (PNA/Fe3O4) sample and M0 (PNA) sample (inset: Fe3O4 sample). (b) PNA structure.
Fig.5  Magnetic moment of Fe3O4: measured sample after 2 months (a); new synthesized sample (b). (Inset: Ramman spectra).
Fig.6  Magnetic moment of samples (inset: the superparamagnetic properties with small Hc).
Fig.7  Dependence of the remained arsenic concentration as a function of the pH.
Fig.8  Determination of equilibrium time of arsenic absorption.
Fig.9  The pore distribution is characteristics through average pore size of Fe3O4 sample (inset: the adsorption–desorption isotherm curve of N2 at 77 K).
Fig.10  The pore distribution is characteristics through average pore size of M1 sample (inset: the adsorption–desorption isotherm curve of N2 at 77 K).
Sample BET specific surface area /(m2•g−1) Saturate magnetic moment /(emu·g−1) qmax /(mg·g−1)
Fe3O4 100.28 63.13 32.88
M0 5.32 0.00 23.45
M1 99.08 58.38 46.97
M2 38.35 56.73 37.74
M3 43.06 43.43 20.27
Tab.2  Specific surface area, saturate magnetic moment and maximum absorption capacity of Fe3O4, M0, M1, M2 and M3
Fig.11  The Langmuir adsorption isotherm curves.
pH Soluble iron ion concentration /ppb
Fe3O4 M3
1 0.21 0.17
2 0.13 0.13
7 – –
Tab.3  Soluble iron ion concentration in the HCl solution
AASatomic absorption spectroscopy
BETBrunauer–Emmett–Teller
IOCDiron oxide-coated diatomite
IOCSiron oxide-coated sand
PNApoly(1-naphthylamine)
SEMscanning electron microscopy
STPstandard conditions for temperature and pressure
TEMtransmission electron microscopy
VSMvibrating sample magnetometer
XRDX-ray diffraction
Tab.1  
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