Carboxylated Multi-walled Carbon Nanotubes/Calcium Alginate Composite for Methylene Blue Removal

In this research work, the adsorption of methylene blue (MB) on carboxylated poly-walled nanotubes carbon (PWNC)/calcium alginate composite was studied. The composite was synthesized by the impregnation method. The study was aimed to observe the impact of carbon nanotube dosage on the ability of the composite to adsorb MB. Kinetics investigation was carried out to observe the suitability of the kinetic model of diffusion in a pore on the adsorption system. Research results show that the multi-walled carbon nanotubes/calcium alginate composite, which had a ball-like shape with a size of approximately 1 mm, had been successfully synthesized with carbon nanotubes dosage up to 15.7 w%. It was found that if the dosage of carbon nanotubes is greater then it will be higher the percent dye removal and the adsorption capacity of the composite. The incorporation as much as 15.7 w% carbon nanotubes to the calcium alginate structure increased its adsorption capacity to almost 2 times higher. The kinetic study had shown that the diffusion through the pore of the composite controls the overall rate of diffusion of methylene blue to the surface of the composite