Nitrogen Doped Graphene Quantum Dots/Manganese Dioxide Nanocomposite as Active Photocatalyst for Degradation of Crystal Violet
نویسندگان
1 Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Islamic Republic of Iran
2 Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Islamic Republic of Iran
3 Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Islamic Republic of Iran
4 Faculty of Chemistry, Kharazmi University, Tehran, Islamic Republic of Iran
doi
10.22052/JNS.2025.04.034چکیده
In this research, nitrogen doped graphene quantum dots (N-GQD) were synthesized by hydrothermal method and used to prepare novel nanocomposite with manganese dioxide (MnO2/N-GQD). The products were characterized by Fourier-transform infrared (FT-IR), UV-Vis spectroscopy, energy-dispersive X-ray analysis (EDX), X-ray diffraction (XRD), scanning electron microscopy (SEM). The photocatalytic activities of N-GQD and MnO2/N-GQD were investigated in the photodegradation of crystal violet under visible light as well as ultraviolet irradiation in short time intervals. The effect of various parameters such as initial dye concentration, amount of photocatalyst, pH, and temperature on the efficiency of the dye removal was also examined and optimal condition was determined. The results showed that the photodegradation process is fast and highly efficient. The equilibrium time is about 5-40 min depending on the amount of photocatalyst and initial dye concentration, and efficiency is 100%. Finally, kinetic studies of reaction showed that the kinetics of reaction follows the first-order model.
