Abstract
Toxic chemical and a strong mutagen ethidium monoazide bromide (EMA) adsorption on the graphene oxide (GO) surface from aqueous solution was investigated. Influencing parameters such as temperature of solution, contact time, ethidium monoazide bromide initial concentration and pH were studied. According to the results of EMA adsorption on graphene oxide, 17 min and pH 10 was selected as the optimum time and pH, respectfully. Adsorption experiments were carried out at various temperatures from 288 to 303 K. The maximum absorption wavelength of EMA is 420 nm. In this study, pseudo-first-order, pseudo-second-order, Elovich, and the intraparticle diffusion kinetic models were used for kinetic study of EMA adsorption process. The results of kinetic study showed that there is a good fit of the experimental kinetic data of EMA adsorption on the surface of GO to the linear form of type (I) of the pseudo -second-order model, because it possess least value of average relative error ARE (%) and high value of linear regression (R2). Thermodynamic parameters; Gibbs energy (Delta G degrees), entropy (Delta S degrees), and enthalpy (Delta H degrees); were calculated and results indicated that EMA adsorption on GO surface as absorbent was spontaneous and endothermic. (C) 2019 Elsevier B.V. All rights reserved.