Graphene Oxide/Alginate Quasi-Cryogels for Removal of Methylene Blue

Quasi-cryogelation technique is a simple yet effective technique for improving the adsorptive efficiency of biopolymer-based adsorbent materials. In this work, a biopolymer-based adsorbent material, graphene oxide alginate quasi-cryogel beads are reported. Alginate biopolymer was crosslinked and fro...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2018-04, Vol.229 (4), p.1-9, Article 131
Main Authors: Balkız, Gizem, Pingo, Evridiki, Kahya, Nilay, Kaygusuz, Hakan, Bedia Erim, F.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Adsorptivity
Alginic acid
Analytical methods
Atmospheric Protection/Air Quality Control/Air Pollution
Beads
Biopolymers
Capacity
Cationic dyes
Cations
Climate Change/Climate Change Impacts
Color removal
Crosslinking
Dyes
Earth and Environmental Science
Electron microscopy
Electrostatic properties
Environment
Environmental monitoring
Fourier transforms
Gels
Graphene
Graphite
Hydrogeology
Infrared spectroscopy
Interactions
Kinetics
Methylene blue
Microstructure
Reaction kinetics
Removal
Scanning electron microscopy
Seaweed meal
Soil Science & Conservation
Water Quality/Water Pollution
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Summary:Quasi-cryogelation technique is a simple yet effective technique for improving the adsorptive efficiency of biopolymer-based adsorbent materials. In this work, a biopolymer-based adsorbent material, graphene oxide alginate quasi-cryogel beads are reported. Alginate biopolymer was crosslinked and frozen at − 21 °C in order to obtain a gel with cryogel-like microstructure. Graphene oxide was included in the bead formulation in order to enhance the adsorptive characteristics. Beads were characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and swelling experiments. Removal of the model cationic dye, methylene blue, was studied by batch adsorption method. It is found that the adsorption follows the Freundlich isotherm model and pseudo-first order kinetics with reaching an adsorption capacity of 122.26 mg/g in 60 min. Results indicate that the physisorption might be due to the π–π interactions between graphene oxide and methylene blue, in addition to electrostatic interactions. Moreover, quasi-cryogelation technique significantly improved the dye removal properties.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-018-3790-5