Synthesis and Investigation of Template Effects on Nanoporous Bi2O3 Morphologies by Sol Gel Method as Photocatalysts for Degradation of Some Organic Dyes as Water Pollutants

Hydrothermal synthesis and structural optimization of Bi2O3/Bi2WO6 nanocomposites for synergistic photodegradation of Indigo Carmine dye

Future research directions aim to optimize the efficiency and sustainability of bismuth-based semiconductors for environmental remediation. In this study, potent Bi2O3/Bi2WO6 composites were synthesized via a facile in situ hydrothermal-assisted impregnation of Bi3+ onto WO3 nano-substrate. Comprehensive characterization using HR-TEM, SEM-EDX, PXRD, XPS, FTIR, PL, and DRS confirmed the structural, morphological, and optical properties of the synthesized materials. The optimized Bi2O3/Bi2WO6 heterojunction exhibited significantly enhanced photocatalytic activity under visible-light (λ > 350 nm) compared to pristine Bi2O3 and WO3, effectively degrading Indigo Carmine (IC) dye. The UV-Vis spectroscopy and chemical oxygen demand (COD) analyses validated the degradation efficiency. A detailed photocatalytic mechanism was proposed based on trapping experiments, band position calculations, and photoluminescence measurements. Furthermore, the fabricated nanocomposites demonstrated excellent stability and recyclability, highlighting their potential for environmental remediation. This study provides a promising strategy for designing efficient visible-light-driven photocatalysts for wastewater treatment.

Photocatalytic degradation of reactive brilliant blue KN-R by Ti-doped Bi2O3

In this study, different compositions of Ti-doped Bi₂O₃ photocatalytic materials were prepared by chemical solution decomposition method. It was used to degrade reactive brilliant blue KN-R, and then characterized by XRD, SEM, UV-vis DRS, XPS, photocurrent, and other detection methods. The results show that when the catalyst dosage is 1.0 g/L and the initial concentration of reactive brilliant blue KN-R is 20 mg/L, the degradation rate of pure Bi₂O₃ to reactive brilliant blue KN-R is 75.30%; the Ti doping amount is 4% (4Ti/Bi₂O₃), 4Ti/Bi₂O₃ had the best degradation effect on reactive brilliant blue KN-R, and the degradation rate could reach 93.27%. When 4Ti/Bi₂O₃ was reused for 4 times, the degradation rate of reactive brilliant blue KN-R only decreased by 6.91%. Doping Ti can inhibit the growth of Bi₂O₃ grains, making the XRD peak of Ti/Bi₂O₃ material wider. The pure Bi₂O₃ particles are larger and the surface is smooth. With the increase of Ti doping content, the surface of Ti/Bi₂O₃ material grows from roughness to nanofibrous Bi₄Ti₃O₁₂. The visible light absorption performance and electron separation and transfer ability of Bi₂O₃ are significantly improved by doping Ti ions. The band gap is reduced from 2.81 to 2.75 eV. In conclusion, doping Ti enhances the visible light absorption and electron separation and transfer capabilities of Bi₂O₃, reduces the band gap, and improves the surface morphology, which makes Bi₂O₃ have higher photocatalytic performance.