State Key Laboratory of Silicate Materials for Architectures , Wuhan University of Technology , Wuhan 430070 , P. R. China.
Department of Materials Science and Engineering , University of California , Los Angeles , California 90095-1595 , United States.
ACS Appl Mater Interfaces. 2018 Nov 21;10(46):39679-39687. doi: 10.1021/acsami.8b13782. Epub 2018 Nov 7.
Development of a high-efficiency heterojunction with an improved photocatalytic property is regarded as a promising way to decontaminate wastewater. Herein, the direct novel Z-scheme heterojunction formed between CeO nanoparticles and hierarchical ZnO was synthesized through the wet chemistry method and then the heat-treatment technique. The as-synthesized ZnO/CeO composites display highly enhanced photocatalytic rhodamine B (RhB) degradation compared with pristine ZnO and CeO. Specifically, ZnO/CeO-3 (mass fraction of CeO, 30%) shows good photostability and the best removal efficiency for photodegradated RhB, which are almost 2.5 and 1.7 times than pristine ZnO and CeO, respectively. On the basis of the detailed characterizations and the degradation behavior of as-prepared samples over RhB, the formed heterojunction between the hierarchical ZnO and CeO nanoparticles is confirmed as the direct Z-scheme heterojunction. The heterojunction system shows fast transfer, high-efficiency separation, and long lifetime of photoinduced charge carriers, as well as enhanced redox capacity. This study affords a novel approach to construct ZnO-based Z-scheme heterojunctions for the photocatalytic applications.
开发具有高效光催化性能的异质结被认为是一种有前途的废水净化方法。本文通过湿化学法和热处理技术合成了 CeO 纳米粒子和分级 ZnO 之间直接形成的新型 Z 型异质结。与原始 ZnO 和 CeO 相比，所合成的 ZnO/CeO 复合材料显示出高度增强的光催化罗丹明 B（RhB）降解性能。具体而言，ZnO/CeO-3（CeO 的质量分数为 30%）表现出良好的光稳定性和对光降解 RhB 的最佳去除效率，分别是原始 ZnO 和 CeO 的 2.5 和 1.7 倍。基于对所制备样品在 RhB 上的详细表征和降解行为，证实了分级 ZnO 和 CeO 纳米粒子之间形成的异质结为直接 Z 型异质结。该异质结体系表现出快速转移、高效分离和光生载流子的长寿命以及增强的氧化还原能力。本研究为构建用于光催化应用的基于 ZnO 的 Z 型异质结提供了一种新方法。
