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Efficient Solar Driven Hydrogen Transfer by Bismuth Based Photocatalyst with Engineered Basic Sites
摘要： Photocatalytic organic conversions involving a hydrogen transfer step (HT) have attracted much attention, but the efficiency and selectivity under visible light irradiation still needs to be significantly enhanced. Here we have developed a noble metal free, basic-site engineered bismuth oxybromide [Bi24O31Br10(OH)δ] that can accelerate the photocatalytic HT step in both reduction and oxidation reactions, i.e., nitrobenzene to azo/azoxybenzene, quinones to quinols, thiones to thiols, and alcohols to ketones under visible light irradiation and ambient conditions. Remarkably, quantum efficiencies of 42% and 32% for the nitrobenzene reduction can be reached under 410 and 450 nm irradiation, respectively. The Bi24O31Br10(OH)δ photocatalyst also exhibits excellent performance in up-scaling and stability under visible light and even solar irradiation, revealing economic potential for industrial applications.
关键词： Organic synthesis,Bismuth oxybromide,Visible light,Hydrogen transfer,Photocatalytic
更新于2025-09-23 15:21:01
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Glucose Induced Formation of Oxygen Vacancy and Bi-Metal Co-modified Bi5O7Br Nanotubes for efficient Performance Photocatalysis
摘要： Here, we prepared Bi metal modified defective-Bi5O7Br nanotubes (Bi/Bi5O7Br-OV) by hydrothermal synthesis to be an efficient photocatalyst. The density function theory (DFT) revealed that oxygen vacancies in Bi5O7Br could form an intermediate level, which could allow electron transfer to new intermediate level, and finally move to the conduction band. The Bi/Bi5O7Br-OV nanotubes demonstrate superior photocatalytic degradation of phenol, showing 3 times higher than that of pristine Bi5O7Br. The defects and Bi endow Bi5O7Br nanotubes with abundant active sites and improve the solar absorption. The increased and more dispersed charge density allow enhanced electronic conductivity and the separation of photogenerated carriers. Furthermore, more ·OH radicals are generated during photochemical reaction, which is beneficial in improving the photocatalytic performance. This work will play significant roles and create opportunities in modifying Bi-based materials for promoting photocatalysis.
关键词： photodegradation,bismuth oxybromide,water treatment,visible light irradiation
更新于2025-09-19 17:15:36