Kinetics of liquid-phase adsorption of organic dye on activated carbons

Abstract

The kinetic parameters of liquid-phase adsorption of a model organic dye, such as methyl orange, from aqueous solution on carbon sorbents were determined under static conditions. Activated carbon and carbon modified with carbon nanotubes synthesized by chemical vapor deposition on metal oxide catalysts were used as experimental materials. It was found that the presence of carbon nanomaterial in the structure of activated carbon intensifies the sorption process and increases the equilibrium adsorption in 2.1 times. The calculated values of the adsorption rate constants showed a 1.5 times higher rate of the extraction process on modified carbons than on standard materials. In addition, the sorption of organic dye was adequately described by the pseudosecond order model, thus, implying a significant contribution of the chemical interaction between adsorbate and adsorbent to the sorption process.