Abstract
Silver-graphene oxide nanocomposite (AgGO) was prepared by a facile hydrothermal method using sodium borohydride as reducing agent. The spherical shaped silver nanoparticles were distributed randomly on the surface of the graphene oxide nanosheets. The synthesized AgGO nanocomposite and GO aqueous solution were employed as the adsorbents for the removal of the anionic dye eosin yellow. The efficiency of the eosin yellow adsorption on AgGO nanocomposite and GO were investigated under various experimental parameters such as pH of the solution, concentration of the dye and temperature. In order to study the nature of the adsorption process, Langmuir and Freundlich isotherm models were studied. The adsorption of eosin yellow onto the GO nanosheet and AgGO nanocomposite follow Langmuir isotherm model. The adsorption capacity of eosin yellow onto the AgGO nanocomposite is greater than GO nanosheets. The thermodynamic parameter such as isosteric heat of adsorption was also evaluated. The remarkable adsorption capacity of eosin yellow onto AgGO was explained using hydrogen bonding and π-π electron-donor-acceptor interactions.
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