• 文献标题:   Graphene Oxide/Alginate Quasi-Cryogels for Removal of Methylene Blue
  • 文献类型:   Article
  • 作  者:   BALKIZ G, PINGO E, KAHYA N, KAYGUSUZ H, ERIM FB
  • 作者关键词:   dye removal, graphene oxide, alginate, methylene blue, adsorption, cryogel
  • 出版物名称:   WATER AIR SOIL POLLUTION
  • ISSN:   0049-6979 EI 1573-2932
  • 通讯作者地址:   Altmbas Univ
  • 被引频次:   2
  • DOI:   10.1007/s11270-018-3790-5
  • 出版年:   2018

▎ 摘  要

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.