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


BALKIZ G., PINGO E., Kahya N., KAYGUSUZ H., Erim F. B.

WATER AIR AND SOIL POLLUTION, cilt.229, sa.4, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 229 Sayı: 4
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s11270-018-3790-5
  • Dergi Adı: WATER AIR AND SOIL POLLUTION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Dye removal, Graphene oxide, Alginate, Methylene blue, Adsorption, Cryogel, CHITOSAN/GRAPHENE OXIDE COMPOSITE, AQUEOUS-SOLUTION, ALGINATE BEADS, EFFECTIVE ADSORBENT, WATER-PURIFICATION, CALCIUM ALGINATE, DYE REMOVAL, ADSORPTION, WASTEWATERS, SURFACES
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

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 degrees 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 pi-pi interactions between graphene oxide and methylene blue, in addition to electrostatic interactions. Moreover, quasi-cryogelation technique significantly improved the dye removal properties.