Article
Graphene oxideFe3O4SO3H nanohybrid a new adsorbent for adsorption and reduction of Cr(vi) from aqueous solutions
RSC Advances
(2017)
Abstract
A sulfonated magnetic graphene oxide (SMGO) hybrid was successfully synthesized via the nucleophilic
substitution reaction and characterized. The removal of chromate by SMGO was investigated. The
effects of contact time, initial pH of the solution, and initial chromate concentration on the removal
efficiency were investigated. The optimal experimental conditions for enhanced chromate removal were
found to be a contact time of 60 min at an initial solution pH of 3. The observed data were fitted with
Lagergren pseudo-second-order kinetic model, indicating that chromate adsorption on SMGO was
a chemical interaction in nature. The Langmuir model was also used to describe the adsorption
processes and the adsorption capacity was found to be 222.22 mg g1. Thermodynamic studies (DG < 0,
DH > 0, DS > 0) revealed that the adsorption process was exothermic and spontaneous. SMGO has
potential to be applied several times after desorption in wastewater treatment.
Disciplines
Publication Date
March 8, 2017
DOI
10.1039/c7ra01536d
Citation Information
Abdolhamid Alizadeh and Muthupandian Ashokkumar. "Graphene oxideFe3O4SO3H nanohybrid a new adsorbent for adsorption and reduction of Cr(vi) from aqueous solutions" RSC Advances Vol. 7 (2017) p. 14876 - 14887 Available at: http://works.bepress.com/abdolhamid-alizadeh/6/