Strong alginate/reduced graphene oxide composite hydrogels with enhanced dye adsorption performance
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Strong alginate/reduced graphene oxide composite hydrogels with enhanced dye adsorption performance Daijun Xiao1 · Minghong He1 · Yulan Liu1 · Lijun Xiong1 · Qiao Zhang1 · Lai Wei2 · Liang Li1 · Xianghua Yu1 Received: 9 June 2019 / Revised: 10 December 2019 / Accepted: 2 January 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The alginate/reduced graphene oxide composite hydrogels with hierarchical network structures were synthesized through the hydrothermal treatment of graphene oxide and alginate in an aqueous solution followed by ionically cross-linking of metal ions. The network of reduced graphene oxide was prepared via self-assembly of graphene nanosheets in the presence of alginate during the hydrothermal process; then, the polymer network of alginate was obtained by ionically cross-linking, forming the composite hydrogel. The effect of metal ions on the physical properties of the composite hydrogels was investigated. The prepared alginate/reduced graphene oxide composite hydrogel cross-linked by Fe3+ ions showed higher compression strength and lower swelling ratio. Moreover, due to the synergetic interaction between graphene and alginate, the composite hydrogels exhibited the improved dye adsorption performance, especially for cationic dyes. Even after ten adsorption/desorption cycles, the composite hydrogels can retain more than 90% dye adsorption capacity. The results indicated that the composite hydrogel with good stability, adsorption and regeneration ability could be a promising candidate for dye removal from waste aqueous solutions. Keywords Alginate · Graphene · Composites · Hydrogel · Dye adsorption
* Liang Li [email protected] * Xianghua Yu [email protected] 1
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Engineering Research Center of Environmental Materials and Membrane Technology of Hubei Province, Key Laboratory for Green Chemical Process of Ministry of Education, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, People’s Republic of China
2
School of Physical Science and Technology, Yili Normal University, Yining 835000, People’s Republic of China
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Vol.:(0123456789)
Polymer Bulletin
Introduction Synthetic dyes and natural dyes are widely used in the modern industry, which are the main sources of colors in water and harmful to the environment [1–3]. Different methods such as adsorption, flocculation, filtration, biological treatment, photocatalytic degradation and electrochemical techniques have been developed for the elimination of the dyes from water [4–12]. Among them, adsorption has received considerable attention due to low cost, simple process and environmental friendliness [13–16]. Recently, alginate as a natural polysaccharide adsorbent has been extensively used to remove several contaminants from the aqueous solution [17–19]. Alginate possesses a linear chain structure of (1–4)-linked b-d-mannuronic acid (M) an
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