A discussion about surface diffusion mechanism for the adsorption of Basic Green 4 dye on to various nano structured carbon materials

Abstract

The investigation of adsorption behavior of Basic Green 4, a basic dye was carried out using multi-walled carbon nanotubes (MWNTs) and nano porous activated carbon materials prepared from Turmeric Industrial Waste (TWAC) as the adsorbents in the batch mode contact time process with respect to initial dye concentration (20, 40 and 60 mg/L), temperature (303,318 and 333 K) and pH. The surface area and pore size volumes for the TWAC and MWNTs were estimated by nitrogen adsorption measurements at 77 K. The morphology of the carbon samples were studied by scanning electron microscopy. A comparison of kinetic models applied to adsorption of Basic Green 4 on both TWAC and MWNTs were evaluated for pseudo first-order, pseudo second-order and Elovich models respectively. Results prove that the pseudo second order kinetic model was found to correlate the experimental data well for both adsorbents. Langmuir and Freundlich adsorption isotherm studies were also measured. The film and pore diffusion kinetics were studied to propose plausible mechanism for the adsorption of Basic Green 4 dye using both multi-walled carbon nano tubes (MWNTs) and nano porous activated carbon materials prepared from Turmeric Industrial Waste (TWAC).