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

Author:
Li, Kunshan, Lu, Xinyu, Zhang, You, Liu, Kuiliang, Huang, Yongchao, Liu, Hong
Source:
Environmental research 2020 v.185 pp. 109409
ISSN:
0013-9351
Subject:
hot water treatment, irradiation, light intensity, methylene blue, photocatalysis, photocatalysts, photons, remediation, synergism
Abstract:
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.
Agid:
6878103