CdS/MIL-101 as a Visible-light-driven Photocatalyst for Methylene Blue Degradation

Abstract

Abstract This research presents the hydrothermal synthesis of the metal-organic framework MIL-101 (Cr) and the CdS/MIL-101 (Cr) catalyst in the photocatalytic degradation of Methylene Blue (MB) dye. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Scanning/transmission electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), thermal analysis (TG), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and nitrogen adsorption/desorption isotherms at 77K were used to characterize the produced samples. Obtained MIL-101 had high crystallinity and a specific surface area of 2,980m2/g. The catalytic activities of CdS/MIL-101 were determined for the degradation of MB in an aqueous solution under visible light. The results demonstrate that CdS/MIL-101 was a good heterogeneous photocatalyst for the degradation of MB. The reactive species of ·OH, e–, and h + generated on CdS were verified to play the predominant role and were believed to be the mechanism of photocatalysis. Using the initial rate approach and the Langmuir-Hinshelwood model, the team investigated the kinetics of the photocatalytic degradation reaction. The CdS/MIL-101 photocatalyst had very good catalytic recyclability and stability, which makes it a possible catalyst for cleaning organic pollutants in water.