Abstract
In this study, Manganese (Mn) and Nickel (Ni) doped on titanium dioxide (TiO2) were loaded on Multi-Walled Carbon Nanotubes (MWCNTs). These catalysts were characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectrometer (FTIR), Scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray energy dispersive spectrometer/Mapping (EDS/Map), Brunauer, Emmett, Teller (BET)/Barrett, Joyner, Halenda (BJH) and Diffuse Reflectance Spectroscopy (DRS) methods. A batch reactor was designed and photoactivity of these materials prepared under visible light irradiation was tested using dibenzothiophene (DBT). The Response Surface Methodology (RSM) based on Box–Behnken Design (BBD) was used to evaluate parameters including catalyst mass (g), time (h) and dopant percentage (wt%). The best point for maximum degradation efficiency was obtained under optimum conditions for Mn/TiO2/MWCNTs and Ni/TiO2/MWCNTs catalyst masses of 0.25 and 0.22 (g), time of 5.30 and 4.56 (h), and dopant percentage of 4.22 and 7.82 (wt%) with an efficiency of 92.82 and 98.26%, respectively. Under optimal conditions for the degradation of DBT sulfur, was investigated desulfurization of gas condensate. The highest desulfurization efficiency was obtained by Ni/TiO2/MWCNTs catalyst at 89.11%. The results of kinetic studies show that the Blanchard model has the best agreement with the experimental data.
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