Author/Authors :
Moradi، Omid نويسنده Department of Chemistry, Shahre-Qods Branch, Islamic Azad University, Shahre-Qods, Iran , , Norouzi، Mehdi نويسنده Hepatitis B Molecular Laboratory, Department of Virology-School of Public Health, Tehran University of Medical Sciences, Tehran, IR Iran , , Fakhri، Ali نويسنده Department of Chemistry, Shahre-Qods Branch, Islamic Azad University, Shahre-Qods, Iran , , Naddafi، Kazem نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran ,
Abstract :
Drinking water resources may be contaminated with Ethidium Bromide (EtBr) which is commonly used in molecular
biology laboratories for DNA identification in electrophoresis. Carbon nanotubes are expected to play an important
role in sensing, pollution treatment and separation techniques. In this study adsorption of Ethidium Bromide on
single-walled carbon nanotubes (SWCNTs) and carboxylate group functionalized single-walled carbon nanotube
(SWCNT-COOH) surfaces have been investigated by UV–vis spectrophotometer. The effect of contact time, initial
concentration and temperature were investigated. The adsorbents exhibits high efficiency for EtBr adsorption and
equilibrium can be achieved in 6 and 3 min for SWCNTs and SWCNT-COOH, respectively. The effect of temperature
on adsorption of EtBr by toward adsorbents shows the process in this research has been endothermic. The
results showed that the equilibrium data were well described by the Langmuir isotherm model, with a maximum
adsorption capacity of 0.770 and 0.830 mg/g for SWCNTs and SWCNT-COOH, respectively. The adsorption of
EtBr on SWCNT-COOH is more than SWCNTs surfaces. A comparison of kinetic models was evaluated for the
pseudo first-order, pseudo second-order models. Pseudo second-order was found to agree well with the
experimental data.
