Synthesis an‎d characterization of magnetic graphitic carbon nitride nanocomposite (MxMyO4/g-C3N4) modified with metal oxide an‎d porphyrin for photocatalytic degradation of pollutants an‎d alcohol oxidation reaction

1/1/1900 12:00:00 AM

In this project, magnetic nanocomposite (CF) g-C3N4/ZnFe2O4 was first synthesized by three different methods: coprecipitation (with two different precursors) an‎d hydrothermal, in order to investigate the effect of the selec‎ted method on the morphology an‎d efficiency of photocatalysis an‎d alcohol oxidation reactions. The results indicated that the composite prepared by the coprecipitation method showed the best performance in performing the aforementioned reactions. A 15 W LED lamp was used to provide the necessary energy for the photocatalysis an‎d alcohol oxidation processes. The photocatalytic reaction was used to degrade three polluting dyes: cationic methylene blue (MB), anionic methyl orange (MO), an‎d neutral 4-nitrophenol (4-NP), with the best performance in the degradation of methylene blue pigment being 63%. This photocatalyst was also used for the oxidation of alcohols, with the best efficiency being obtained for benzyl alcohol with a conversion percentage of 89%. Next, to improve the performance of the nanocomposite, the prepared tetrakis (4-carboxyphenyl) porphyrin (TCPP) compound was added to it an‎d the new nanocomposite was named (CFP) g-C3N4/ZnFe2O4/TCPP. As porphyrin compounds are suitable absorbers for visible light, its use led to an increase in the efficiency of pollutant degradation an‎d alcohol oxidation reaction by approximately 76% an‎d 96%, respectively. Another factor that was considered to improve the performance was the addition of tungsten oxide (WO3), which also had a significant effect on the efficiency of the aforementioned reactions due to the facilitation of electron flow in the desired structure. This new nanocomposite was named g-C3N4/ZnFe2O4/WO3/TCPP (CFWP). To determine the appropriate percentage of WO3 to be added to the desired nanocomposite, optimization was carried out an‎d weight percentages of 6, 8 an‎d 10 were eva‎luated, an‎d the results of the studies showed that adding it at a rate of 8% will result in the best results in the efficiency of both photocatalytic degradation an‎d alcohol oxidation reactions.

نانوكامپوزيت , پورفيرين , فتوكاتاليزگر , اكسايش الكل ها , كاتاليزگر ناهمگن

Nanocomposite , Porphyrin , Photocatalyst , Alcohols oxidation , Heterogeneous catalyst

Mahdi Heidari-Golafzani

Rahmatollah Rahimi