Biomass-derived N-doped Carbon Dots/TiO₂ for Visible-Light-Induced Degradation of Methyl Orange in Wastewater

A facile hydrothermal technique prepared n-doped carbon dots/titanium dioxide (N-CDs/TiO₂) for visible light photocatalysis of dye in wastewater. Several instruments, such as XRD, TEM, BET, UV-VIS, and PL, analyzed the produced. The results confirmed that N-CDs were successfully embedded on the TiO₂ surface. The diffractogram N-CDs/TiO₂ shows the formation of TiO₂ and amorphous carbon. The N-CDs/TiO₂ also shows an adsorption peak at 1630 cm^− 1, indicating the formation of TiO₂. The specific surface area and pore volume of N-CDs/TiO₂ nanocomposites were 7.75 m²/g and 0.02 cm³/g. The pore size was 6.74 nm. TEM images indicate that TiO₂ has been embedded on the surface of the N-CDs. The PL spectra indicate that the presence of N-CDs significantly increases the absorbance of N-CDs/TiO₂ in the visible light range and emits visible light at nearly 500 nm. The optimum percentage of methylene orange (MO) degradation with nanocomposites reached 62.5% within 20 min. N-CDs/TiO₂ can be used as a photocatalyst to degrade MO. N-CDs/TiO₂ can be used to produce MO-polluted wastewater purification.