Immobilization of BaWO4 nanostructures on a MOF-199-NH2: An efficient separable photocatalyst for the degradation of organic dyes

In the present work, we have reported the straightforward preparation of a novel MOF heterostructure with the BaWO4 under mild conditions. In order to confirm the structure of the synthesized composite we utilized different characterization techniques including Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Diffuse reflectance spectroscopy (DRS) and Photoluminescence (PL). To investigating and addressing the photocatalytic properties of the prepared system we have selected the Methyl Orange (MO) and 4-Nirophenol (4-NP) contaminants as model dyes. In order to evaluate the photocatalytic activity of the prepared system various weight percent of the MOF and BaWO4 have been prepared. According to the experimental obtained results the composite photocatalyst with the weight ratio of (2:1) showed the highest photocatalytic activity to the degradation of methyl orange (MO) and 4-Nitrophenol (4-NP) water contaminants. Moreover, the ratio of (2:1) serves as the optimum amount in this system. It is noteworthy that the MOF substrate have a synergistic effect for the enhancing of photocatalytic ability. Accordingly, to further investigating the photocatalytic activity a proposed mechanism have been represented. Moreover, MOF-199-NH2/BaWO4 could be recycled several times without noticeable loss of activity.