Jia Z, Lyu F, Zhang L C, Zeng S, Liang S X, Li Y Y, Lu J
Hong Kong Branch of National Precious Metals Material Engineering Research Center, Department of Material Science and Engineering, City University of Hong Kong, Hong Kong, China.
Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China.
Sci Rep. 2019 May 21;9(1):7636. doi: 10.1038/s41598-019-42973-6.
Exploring an efficient and photostable heterostructured photocatalyst is a pivotal scientific topic for worldwide energy and environmental concerns. Herein, we reported that Pt decorated g-CN/BiMoO heterostructured composites with enhanced photocatalytic performance under visible light were simply synthesized by one-step hydrothermal method for methylene blue (MB) dye degradation. Results revealed that the synthetic Pt decorated g-CN/BiMoO composites with BiMoO contents of 20 wt.% (Pt@CN/20%BMO) presented the highest photocatalytic activity, exhibiting 7 and 18 times higher reactivity than the pure g-CN and BiMoO, respectively. Structural analyses showed that BiMoO microplates were anchored on the wrinkled flower-like g-CN matrix with Pt decoration, leading to a large expansion of specific surface area from 10.79 m/g for pure BiMoO to 46.09 m/g for Pt@CN/20%BMO. In addition, the Pt@CN/20%BMO composites exhibited an improved absorption ability in the visible light region, presenting a promoted photocatalytic MB degradation. Quenching experiments were also conducted to provide solid evidences for the production of hydroxyl radicals (OH), electrons (e), holes (h) and superoxide radicals (O) during dye degradation. The findings in this critical work provide insights into the synthesis of heterostructured photocatalysts with the optimization of band gaps, light response and photocatalytic performance in wastewater remediation.
探索一种高效且光稳定的异质结构光催化剂是全球能源和环境领域关注的关键科学课题。在此，我们报道了通过一步水热法简单合成的具有增强可见光光催化性能的Pt修饰g-CN/BiMoO异质结构复合材料，用于亚甲基蓝（MB）染料降解。结果表明，BiMoO含量为20 wt.%的合成Pt修饰g-CN/BiMoO复合材料（Pt@CN/20%BMO）表现出最高的光催化活性，其反应活性分别比纯g-CN和BiMoO高7倍和18倍。结构分析表明，BiMoO微板通过Pt修饰锚定在褶皱的花状g-CN基质上，导致比表面积从纯BiMoO的10.79 m²/g大幅扩展到Pt@CN/20%BMO的46.09 m²/g。此外，Pt@CN/20%BMO复合材料在可见光区域表现出增强的吸收能力，促进了光催化MB降解。还进行了猝灭实验，为染料降解过程中羟基自由基（OH）、电子（e⁻）、空穴（h⁺）和超氧自由基（O₂⁻）的产生提供了确凿证据。这项关键工作的研究结果为优化带隙、光响应和光催化性能以合成用于废水修复的异质结构光催化剂提供了见解。
