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Bi3TaO7/Ti3C2 heterojunctions for enhanced photocatalytic removal of water-borne contaminants

Li, Kunshan, Lu, Xinyu, Zhang, You, Liu, Kuiliang, Huang, Yongchao, Liu, Hong
Environmental research 2020 v.185 pp. 109409
hot water treatment, irradiation, light intensity, methylene blue, photocatalysis, photocatalysts, photons, remediation, synergism
Novel catalysts are of great interest for improved photocatalytic environmental remediation. Using a hydrothermal method, 0D/2D Bi₃TaO₇/Ti₃C₂ heterojunctions were designed rationally and characterized systematically as excellent photocatalysts for photocatalytic degradation. The hybrid catalyst exhibits superior performance in visible-light-driven photocatalytic degradation of methylene blue (about 99% degradation efficiency after 2 h) and excellent stability (up to 10 cycles) under visible light irradiation (300 W Xe lamp; λ > 420 nm; light intensity 150 mW cm⁻²). In addition, Bi₃TaO₇/Ti₃C₂ has a larger rate constant (0.032 min⁻¹) than pristine Bi₃TaO₇ (0.006 min⁻¹). Quantum yield (2.27 × 10⁻⁵ molecules/photon) and figure of merit (23.3) of the system were obtained, suggesting that our catalyst has potential for application. Both experimental and computational results indicate that synergistic effects between Bi₃TaO₇ and Ti₃C₂ improve photocatalytic performance by enhancing electron-hole pair separation, electronic transmission efficiency, and interfacial charge transfer. These findings contribute to the synthesis of efficient visible-light-driven Bi-based photocatalysts and to the understanding of photocatalytic degradation reactions.