Mechanistic aspects of enhanced congo red adsorption over graphene oxide in presence of methylene blue. Issue 3 (September 2016)

• Record Type: Journal Article
• Authors: Padhi, Deepak Kumar; Parida, K.M.; Singh, S.K.
• Is Part Of: Journal of environmental chemical engineering. Volume 4:Issue 3(2016:Sep.)
• Page Start: 3498
• Page End: 3511
• Publication Date: 2016-09
• Subjects: Graphene oxide -- Electrostatic interaction -- pH -- Dye adsorption mechanism; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2016.07.011
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Enhanced adsorption of Congo red over GO in presence of Methylene blue. Highlights: A novel approach for the evaluation of adsorption capacity of Graphene oxide (GO) for the adsorption of anionic dye in presence cationic dye from aqueous solution. Enhanced adsorption of Congo red (CR) over GO is well explained on the basis of pH dependant structural interaction with Methylene blue (MB) in aqueous medium. The role of MB molecule in enhancing the adsorption capacity of GO towards the adsorption of CR molecules is well supported and explained by Fourier transform infrared spectroscopy and Raman spectrum of dye adsorbed GO. At pH = 2 GO possesses 96% adsorption capacity for Congo red dye in presence of Methylene blue. Abstract: To elucidate the role of cationic dye for the enhanced adsorption of anionic dye over Graphene oxide(GO), we have made a novel approach to evaluate the adsorption capacity of GO for removal of Congo red (CR) from aqueous system in presence of Methylene blue (MB). Physicochemical and spectroscopic techniques have been used to assertion the interaction of dye molecules with the surface of GO. At pH = 2, GO possessed 96% adsorption capacity towards CR in presence of MB. The existing pH dependant electrostatic interaction mechanism between CR and MB dye has been explained for enhanced CR adsorption over GO surface. Fourier transform infrared spectroscopy and Raman spectrum of dye adsorbed GO also gives well support to evaluate the extent of electrostatic interaction between oxygen containing functional groups and functional moieties of dye resulting in good adsorption over GO surface.