Abstract
In this study, multi-walled carbon nanotubes (MWCNT) surface functionalization with amine group is studied for methyl orange (MO) dye removal from aqueous solution. The adsorbent was prepared using 1,2-ethylenediamine as amine via a microwave combination to functionalize the carbon nanotubes with carboxylic acid (-COOH) then converting to acyl chloride (-COCl) as intermediate using thionyl chloride. The prepared material shows a suburb adsorption performance of MO removal with ahigh adsorption capacity of 96mgg(-1). In addition, the equilibrium data are introduced by the Langmuir and Freundlich isotherms, and showed Langmuir is the best fit with the adsorption capacity of 25.73mgg(-1). Moreover, pseudo-second order is found to be the best kinetic model to fit the experimental data. According to kinetics results, the adsorption process involves chemisorption step. MWCNT-NH2 is an excellent candidate to be used as an effective adsorbent for pollution removal from the aqueous environment.
[GRAPHICS]
.