INVESTIGATION OF THE PROPERTIES AND ENHANCED PHOTOCATALYTIC ACTIVITY OF Bi2WO6/g-C3N4 COMPOSITE MATERIALS

DOI: 10.18173/2354-1059.2025-0023

Tóm tắt

Bi2WO6/g-C3N4 composite materials with varying g-C3N4 weight fractions (5%, 10%, 15% and 20%) were successfully synthesized using a combined microwave-hydrothermal method. The structural, morphological, and optical properties of the composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis absorption spectroscopy, and photoluminescence (PL) spectroscopy. Photocatalytic performance was evaluated by the degradation of Rhodamine B (RhB) under simulated sunlight, employing a cutoff filter to eliminate wavelengths below 400 nm. The incorporation of g-C3N4 into Bi2WO6 was found to significantly modify its morphology and enhance its optical absorption. All composite samples exhibited superior photocatalytic activity compared to pure Bi2WO6, with the 10 wt% g-C3N4 composite achieving the highest degradation rate, approximately seven times that of pristine Bi2WO6. This enhancement is primarily attributed to the formation of a Z-scheme heterojunction between Bi2WO6 and g-C3N4, which promotes efficient charge separation and suppresses electron-hole recombination via electron trap centers