| Abstrakt: |
Different composites consisting of Zeolite A, ZIF-8, and CuS NPs were prepared by a solvothermal method and their potential was studied for removal of methylene blue (MB) from aqueous solutions. All of the synthesized composites were characterized by Fourier-transform infrared spectroscopy, powder X-Ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, energy dispersive X-Ray analysis, and diffuse reflectance spectroscopy. In order to optimize the experimental conditions, effect of many parameters including contact time, pH of solution, temperature, adsorbent dosage, and initial dye concentration was studied. It was found that CuS NPs/Zeolite A/ZIF-8 composite had a higher MB adsorption capacity than other adsorbents including Zeolite A/ZIF-8 and CuS NPs/ZIF-8. Under the optimized conditions, 75% dye removal efficiency was observed for the CuS NPs/Zeolite A/ZIF-8 composite. Kinetics and thermodynamics of the corresponding adsorption processes was also studied. The Langmuir isotherm model showed a better agreement with the obtained results and the adsorption process of MB fitted the pseudo-second-order kinetic model. Thermodynamic parameters, on the other hand, demonstrated that the adsorption process was exothermic. More interestingly, in presence of an affordable oxidant such as hydrogen peroxide, the MB removal efficiency was raised to 87%. [ABSTRACT FROM AUTHOR] |
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