Sonochemical synthesis of a new Zn(II) metal-organic framework/g-C3N4 nanocomposite with enhanced photocatalytic activity for degradation of amoxicillin under simulated sunlight

فاقد چكيده فارسي

Under sonochemistry, this study has prepared three-dimensional Zn(ii) metal–organic framework nanostructures, [Zn4(2-ATA)2(1H-BTA)2]n (1H-benzotriazole (1H-BTA), 2-aminoterephthalic (2-ATA)), called compound 1. Field emission scanning electron microscopy (FE-SEM), powder XRD, and FT-IR spectroscopy were employed to characterize the compound 1. Thermal gravimetric analysis (TGA) was respectively used to investigate the thermal stability of this compound. Effects of the initial reagent concentration, ultrasound illumination power, and reaction time on the shape and size of the nanostructured compound 1 were investigated. Under ultrasonic irradiation, the synthesized nanostructures were combined with graphitic carbon nitride (g-C3N4) as a new nanocomposite for photocatalytic degradation of amoxicillin (AMX) as a pollutant model. In addition to IR, XRD, and FE-SEM analyses, these nanocomposites were further analyzed using PL and UV-DRS. Compared to pure compound 1 and g-C3N4, MOF@g-C3N4 nanocomposites demonstrated a more advanced photocatalytic behavior under visible light, which can be explained by the increased specific surficial area and decreased rate of the electron-hole recombination. The optimal percentage of weight for g-C3N4 was 30%. The major reactive species for AMX degradation was observed to be superoxide (•O2-) and photogenerated hydroxyl (•OH) radicals. Zno nanostructures could also be straightforwardly produced when the prepared MOFs were directly calcined using solvothermal (i.e. single crystals of compound 1) and sonochemical (i.e. nanostructures of compound 1) routes obtained at 550 ℃.