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

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.

Bisphenol A Adsorption from Aqueous Solution using Graphene Oxide-Alginate Beads

“…The BET surface areas of AB and GO-AB obtained in this work were 51.28 and 7.19 m 2 •g -1 , respectively, while the average pore diameters of AB and GO-AB were 12.14 and 24.52 nm, respectively. These values were comparatively higher than an earlier reported value (0.2-2.6 m 2 •g -1 and 1.3-2.8 nm) (Yang et al 2018) although the amount of GO added into the alginate solution in this work was smaller. Although the surface area of adsorbent reduced with the addition of GO, the pore diameter shows a different trend.…”

“…This is because the alginate can act as a scaffold material and also a template for 3D porous structure, while GO acts as a reinforcing filler/linker to connect and strengthen the composite network. Yang et al(2018) prepared double network graphene oxide/sodium alginate(GO/SA) hydrogels and the adsorption of Mn(II) was noticed to be better (56.49 mg•g −1 ) as compared to other adsorbents. In additions, the GO/SA hydrogels have better thermal stability and biocompatibility due to GO and SA, respectively.…”

Carbon Nanomaterials for the Treatment of Heavy Metal-Contaminated Water and Environmental Remediation

“…Figure 5 shows the schematic illustration of the working principle of microbots. Yang et al designed hydrogen beads using graphene oxide and sodium alginate (GO-SA) and successfully applied them for the removal of Mn 2+ ions from the aqueous solution with excellent adsorption capacity of 56.49 mg/g [9]. Zheng et al designed nanocomposites by fabrication of zinc oxide with tea polyphenol with reduced graphene oxide (TPG-ZnO).…”

Advancing fabrication and properties of three-dimensional graphene–alginate scaffolds for application in neural tissue engineering

“…In addition, the elemental peaks corresponding to oxygen drops aer reduction in gelatin solution, conrming the successful reduction of GO in the Na-ALG matrix. 35 Zeta potential is another important method to estimate the performance of scaffold's material in cell culture as negativecharged surfaces are apposite for cell adhesion. The zeta potentials of prepared GO and commercial Na-ALG were about À45 mV and À17 mV, respectively.…”