Photoreactive Carbon Dots Modified g-C3N4 for Effective Photooxidation of Bisphenol-A under Visible Light Irradiation

A series of carbon dots (CDs) modified g-C3N4 (xCDs/g-C3N4; x = 0.5, 1.0, and 1.5 mL CDs solution) was synthesized via the microwave-assisted hydrothermal synthesis method for photooxidation bisphenol-A (BPA) under visible light irradiation. The X-ray diffraction (XRD) analysis indicates that may have a turbostratic structure resulting photocatalysts distorted crystal structure, as compared with pure g-C3N4. high-resolution transmission electron microscope (HR-TEM) revealed amorphous, mono-disperse, spherical an average particle size 3.75 nm. distribution within matrix appear small dark dot-like domains. N2 adsorption-desorption nanocomposites are mesoporous density functional theory (DFT) estimate pore between 2–13 quantum yield (QY) determined to be 12% using UV-vis spectral analysis, where CDs/g-C3N4 has improved absorption in region than higher BET surface area provided more adsorption sites ability photogenerated e−/h+ pairs, which caused better photocatalytic efficiency rest systems. highest removal, 90%, achieved at following optimum conditions: BPA initial concentration 20 mg L−1, catalyst dosage 30 pH 10. process is mainly driven by holes (h+) followed •OH O2•−. system simple cost-effective, this photocatalyst highly stable reusable versus other systems reported literature.