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. 2021 Mar 9:2021:6670913.
doi: 10.1155/2021/6670913. eCollection 2021.

Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

Thu Dieu Le  1 , Luyen Thi Tran  1 , Hue Thi Minh Dang  1 , Thi Thu Huyen Tran  1 , Hoang Vinh Tran  1
Affiliations

Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

Thu Dieu Le et al. J Anal Methods Chem. .

Abstract

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co2+) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe3O4) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe3O4 nanocomposite was applied for Co2+ ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite followed the pseudo-second-order kinetic model with the rate constant k2 being 0.0026 (g mg-1·min-1). The Langmuir model is suitable to describe the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite with the maximum sorption capacity (q max) reaching 373.37 mg·g-1. The obtained results also indicated that the GO/PVA/Fe3O4 nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe3O4 nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.

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Conflict of interest statement

The authors declare that they have no conflicts of interest.

Figures

Figure 1
Figure 1
(a) XRD patterns of GO (A) and GO/PVA/Fe3O4 (B) sample; (b) FT-IR of GO (A), PVA (B), and GO/PVA/Fe3O4 (C); (c–f) SEM images with different magnifications of (c, e) GO and (d, f) GO/PVA/Fe3O4, respectively; nitrogen (N2) adsorption-desorption isotherm (g) and BJH pore size distribution (h) of the as-synthesized GO/PVA/Fe3O4 sample.
Figure 2
Figure 2
Optimization conditions for adsorption Co2+ ion onto GO/PVA/Fe3O4 nanocomposite: (a) effect of contact time, (b) effect of the adsorbent dosage: (A) 0.03 g; (B) 0.02 g; (C) 0.01 g, respectively, (c) effect of temperature, and (d) effect of pH: (A) pH 2 and (B) pH 5.2 (inserted image: % removal of samples vs. pH).
Figure 3
Figure 3
(a) ln(At–Ae) vs. t plot and (b) t/q vs. t plot to calculate the rate constant. Experimental conditions: madsorbent = 0.034 g, T = 30°C, pH = 7, and Co = 20 mg·L−1.
Figure 4
Figure 4
Adsorption isotherm following (a) Langmuir and (b) Freundlich models for Co2+ ion adsorption onto the GO/PVA/Fe3O4, nanocomposite. Experimental conditions: pH = 5.2, C0 = 100–250 mg·L−1, T = 303 K, and madsorbent = 0.01 g.
Figure 5
Figure 5
(a, b) SEM and (c, d) EDS spectra of the adsorbent before (a, c) and after (b, d) Co2+ ion adsorption process.
See this image and copyright information in PMC

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