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. 2018 Jul 16;8(1):10717.
doi: 10.1038/s41598-018-29133-y.

Removal of Mn (II) by Sodium Alginate/Graphene Oxide Composite Double-Network Hydrogel Beads from Aqueous Solutions

Xiuzhen Yang  1 , Tengzhi Zhou  1 , Bozhi Ren  1 , Andrew Hursthouse  1   2 , Yuezhou Zhang  3
Affiliations

Removal of Mn (II) by Sodium Alginate/Graphene Oxide Composite Double-Network Hydrogel Beads from Aqueous Solutions

Xiuzhen Yang et al. Sci Rep. .

Abstract

After the successful preparation of empirical double network hydrogel beads from graphene oxide/sodium alginate(GO/SA), its cationic metal adsorption performance in aqueous solutions were investigated. Taking Mn(II) as an example, the contribution of several factors including pH, bead dosage, temperature, contact time and initial concentration ions to adsorption efficiency were examined. The Transmission Electron Microscopy (TEM) results indicate that the GO/SA double (GAD) network hydrogel bead strongly interpenetrate and the adsorption of Mn(II) is mainly influenced by solution pH, bead dose and temperature. The GAD beads exhibit an excellent adsorption capacity of 56.49 mg g-1. The adsorption process fit both Pseudo-second order kinetic model (R2 > 0.97) and the Freundlich adsorption isotherm (R2 > 0.99) and is spontaneous. After seven rounds of adsorption-desorption cycle, the adsorption capacity of GAD hydrogel remained unchanged at 18.11 mg/g.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
N2 adsorption and desorption isotherms (a) and pore size distributions (b) of GAD and SA.
Figure 2
Figure 2
DSC-TG record of GAD (7.2 mg) measured in nitrogen.
Figure 3
Figure 3
TEM of the (a) GO, the (b) GAD before adsorption and the (c) GAD after adsorption.
Figure 4
Figure 4
FTIR spectra of GO, GAD and GAD-Mn.
Figure 5
Figure 5
SEM of the (a) GO, the (b) sodium alginate, the (c) GAD before adsorption and the (d) GAD after adsorption.
Figure 6
Figure 6
EDX of the GAD (a) before adsorption and the (b) after adsorption.
Figure 7
Figure 7
Effect of pH on adsorption efficiency of Mn(II).
Figure 8
Figure 8
Effect of GAD dose on removal efficiency of Mn(II).
Figure 9
Figure 9
Effect of contact time on removal Mn(II) by GAD.
Figure 10
Figure 10
Pseudo-first order reaction model.
Figure 11
Figure 11
Pseudo-second order reaction model.
Figure 12
Figure 12
Intra-particle diffusion model.
Figure 13
Figure 13
Effects of temperature on removal of Mn(II) by GAD.
Figure 14
Figure 14
The Langmuir adsorption isotherm.
Figure 15
Figure 15
The Freundlich adsorption isotherm.
Figure 16
Figure 16
The Temkin adsorption isotherm.
Figure 17
Figure 17
Linear fit for the Thermodynamic parameters for Mn(II) sorption onto GAD hydrogel beads.
Figure 18
Figure 18
Adsorption-desorption cycle of GAD.
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