- Thesis topic: The photocatalytic removal of NO over SnO2@g-C3N4, Ag/TiO2@g-C3N4, Ag/MgO@g-C3N4 under the visible and solar light

- Doi: https://doi.org/10.6840/cycu202201140

- Abstract: 

        Air pollution is becoming increasingly serious because of the large amounts of nitrogen oxides emitted by stationary and mobile pollution sources; photocatalysis for pollutant degradation is a method that has been widely discussed and used due to its low cost, ease of operation, and difficulty in generating toxic substances.
        In this study, SnO2@g-C3N4, Ag/TiO2@g-C3N4, and Ag/MgO@g-C3N4 were constructed, and the pollutant-nitrogen oxides in the air were eliminated using sunlight and visible light. To synthesis catalysts, two alternative Ag doping methods, the F127 method, and the UV approach, were utilized, along with varying doping ratios of 1%, 3%, 5%, and 10% to investigate different production methods and ratios. the most suitable parameters. When the nitrogen oxide concentration is 500ppb, 30% SnO2@g-C3N4 can remove 62.21% of NO in solar light; 1%Ag/TiO2@g-C3N4 can remove 79.91% of NO under solar light; and 5% Ag/MgO@g-C3N4 can remove 79.97% of NO under solar light, according to the data. 30% SnO2@g-C3N4 can remove 36.23% NO under visible light; 1% Ag/TiO2@g-C3N4 can remove 72.98% NO; and 5% Ag/MgO@g-C3N4 can remove 68.40% NO. According to the findings, the activity of the catalyst can be increased by using the F127 method to dope Ag; however, when using the UV method, the greater the Ag doping ratio, the lower the activity.
         Among the various catalysts tested, 1% Ag/TiO2@g-C3N4 has the best results. It has a clearance rate of more than 72% under sunlight and visible light, as well as in 6-cycle tests. The state is extremely stable, making it ideal for long-term research. The features of the catalyst with the best effect in different materials were investigated using X-ray diffractometer (XRD), Fourier-transform infrared spectroscopy (FTIR), Transmission electron microscope (TEM), Specific Surface Area and Porosimetry Analyzer (BET), X-ray photoelectron spectroscopy (XPS) equipment. The optical characteristics of the composite material may be assessed and the doping appearance of the catalyst can be seen.

Keywords: Nitrogen oxides, Ag Doped, TiO2, SnO2, MgO, g-C3N4, Photocatalytic