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Open AccessArticle

Synthesis, Characterization and Sorption Capacity Examination for a Novel Hydrogel Composite Based on Gellan Gum and Graphene Oxide (GG/GO)

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Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, Polizu 1-7, 060042 Bucharest, Romania
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Faculty of Engineering, Lucian Blaga University of Sibiu, 550024 Sibiu, Romania
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Faculty of Industrial Engineering and Robotics, Politehnica University of Bucharest, 060042 Bucharest, Romania
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Authors to whom correspondence should be addressed.
Polymers 2020, 12(5), 1182; https://doi.org/10.3390/polym12051182
Received: 13 May 2020 / Revised: 18 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
A novel hydrogel composite based on gellan gum and graphene oxide (GG/GO) was synthesized, characterized and tested for sorption capacity in this work. The microstructural, thermogravimetric and spectroscopic analysis confirmed the formation of the GG/GO composite. Comparative batch sorption experiments revealed a sorption capacity of the GG/GO composite for Zn (II) ions of approximately 2.3 higher than that of pure GG. The GG/GO composite exhibits a maximum sorption capacity of 272.57 mg/g at a pH of Zn (II) initial solution of 6. Generally, the sorption capacity of the sorbents is approximately 1.5 higher in slightly acidic conditions (pH 6) comparative with that for strong acidic conditions (pH 3). The sorption isotherms revealed that the sorption followed a monolayer/homogenous behavior. The sorption kinetic data were well fitted by the pseudo-second-order kinetic model, and were consistent with those derived from sorption isotherms. The intraparticle diffusion was considered to be the rate-determining step. Two main sorption mechanisms for Zn (II) were identified namely, ion exchange at low pH values, and both ion exchange and chemisorption in weekly acidic conditions. View Full-Text
Keywords: hydrogel composite; graphene oxide; gellan gum; zinc sorption hydrogel composite; graphene oxide; gellan gum; zinc sorption
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Modrogan, C.; Pandele, A.M.; Bobirică, C.; Dobrotǎ, D.; Dăncilă, A.M.; Gârleanu, G.; Orbuleţ, O.D.; Borda, C.; Gârleanu, D.; Orbeci, C. Synthesis, Characterization and Sorption Capacity Examination for a Novel Hydrogel Composite Based on Gellan Gum and Graphene Oxide (GG/GO). Polymers 2020, 12, 1182.

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