Microwave-assisted hydrothermal synthesis as a nanocomposite with superior adsorption capacity for efficient removal of toxic Maxillon blue(GRL) dye from aqueous solutions

In this study, a microwave assisted hydrothermal technique was employed for the synthesis of CNT/ZnO nanocomposite. Carbon nanotubes were obtained from incineration stacks in furnaces. They were treated with concentrated (0.1 N) H3PO4. The structures of nano-composites were characterized via utilizing powder (FE-SEM), and (TEM). Specific surface area (BET), total pore volume, and mean pore size were too studied through utilizing Bruneuer Emmatt Teller (BET) technique to refer to the properties surface of the nano-composites. Several operational factors like initial concentration of GRL dye, amount of CNT/ZnO nanocomposite, solution of pH, and temperature solution by utilize of CNT/ZnO nanocomposite in the adsorption of GRL dye. It was found that removal percentage E % rises with increase weight of the nanocomposite until all the active sites of the nanocomposite are saturated. The percentage removal of GRL dye rises from 45.42% to 90.853% for solution pH increase about 3.2-10.5. The result of the kinetic was studied by means of several model kinetic like first model, the second model, and Elcovich model was found to be the maximum kinetic model second-order (R^2=0.9986) for our adsorption investigation. The thermodynamic factor having change Gibbs energy (ΔG), change entropy (ΔS), and change enthalpy (ΔH). The negative value of ΔH (-9.043 kJ.mol^-1) was estimated for the adsorption method and the adsorption is a physical and exothermic, positive value ΔS (13.8469 J.mol-1 K^-1), and the values negative of (ΔG) in the range temperature of 10-30 °C, confirming that the dye adsorption on to Nano composite was spontaneous.