Graphene Oxide Nanosheets as An Efficient and Reusable Sorbents for Eosin Yellow Dye Removal from Aqueous Solutions. Issue 13 (5th May 2017)

• Record Type: Journal Article
• Authors: Veerakumar, Pitchaimani; Tharini, Jeyapragasam; Ramakrishnan, Muneeswaran; Panneer Muthuselvam, I.; Lin, King‐Chuen
• Is Part Of: ChemistrySelect. Volume 2:Issue 13(2017)
• Page Start: 3598
• Page End: 3607
• Publication Date: 2017-05-05
• Subjects: adsorption -- electrostatic interaction -- eosin yellow -- graphene oxide nanosheets -- hydrogen bonding; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201700281
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In this study, 2D graphene oxide nanosheets (GONS) were synthesized and characterized by XRD, Raman, SEM, FE‐SEM, TEM, XPS, TGA, UV‐vis and FTIR spectral techniques. The efficiency of eosin yellow (EY) dye adsorption on the GONS under various experimental parameters such as contact time, pH and temperature was investigated. Adsorption kinetic data were characterized appropriately using pseudo second‐order‐kinetics and intraparticle diffusion methods. Free energy of adsorption (ΔG 0 ), enthalpy (ΔH 0 ), entropy (ΔS 0 ) changes, activation energy and Arrhenius factors were also calculated. The endothermic and spontaneous nature of the adsorption process was confirmed by the positive value of the enthalpy change (ΔH 0 ) and the negative value of free energy change (ΔG 0 ). The adsorption mechanism was investigated by FTIR spectra of GONS before and after adsorption of EY dye molecules. The remarkable adsorption capacity of EY onto the GONS can be attributed to the various adsorption interaction mechanisms such as hydrogen bonding, π‐π electron, and electrostatic interactions. The maximum adsorption capacity for EY was calculated to be 217.33 mg g ‐1 . Abstract : Graphene oxide nanosheets (GONS) showed excellent adsorption performance of eosin yellow (EY) dye molecules in aqueous solution. It shows superior adsorption capacity of 217.33 mg g −1 within as short as 10 min and also offer a high potential for various pollutant removal processes.