Xi Junhua, Xia Hong, Ning Xingming, Zhang Zhen, Liu Jia, Mu Zijie, Zhang Shouting, Du Peiyao, Lu Xiaoquan
Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
Tianjin Key Laboratory of Molecular Optoelectronic, Department of Chemistry, School of Science, Tianjin University, Tianjin, 300072, China.
Small. 2019 Oct;15(43):e1902744. doi: 10.1002/smll.201902744. Epub 2019 Sep 18.
Efficient charge separation and sufficiently exposed active sites are important for light-driving Fenton catalysts. 0D/2D hybrids, especially quantum dots (QDs)/nanosheets (NSs), offer a better opportunity for improving photo-Fenton activity due to their high charge mobility and more catalytic sites, which is highly desirable but remains a great challenge. Herein, a 0D hematite quantum dots/2D ultrathin g-C N nanosheets hybrid (Fe O QDs/g-C N NS) is developed via a facile chemical reaction and subsequent low-temperature calcination. As expected, the specially designed 0D/2D structure shows remarkable catalytic performance toward the removal of p-nitrophenol. By virtue of large surface area, adequate active sites, and strong interfacial coupling, the 0D Fe O QDs/2D g-C N nanosheets establish efficient charge transport paths by local in-plane carbon species, expediting the separation and transfer of electron/hole pairs. Simultaneously, highly efficient charge mobility can lead to continuous and fast Fe(III)/Fe(II) conversion, promoting a cooperative effect between the photocatalysis and chemical activation of H O . The developed carbon-intercalated 0D/2D hybrid provides a new insight in developing heterogeneous catalysis for a large variety of photoelectronic applications, not limited in photo-Fenton catalysis.
高效的电荷分离和充分暴露的活性位点对于光驱动芬顿催化剂至关重要。零维/二维杂化材料，特别是量子点（QDs）/纳米片（NSs），由于其高电荷迁移率和更多的催化位点，为提高光芬顿活性提供了更好的机会，这是非常令人期待的，但仍然是一个巨大的挑战。在此，通过简便的化学反应和随后的低温煅烧，制备了一种零维赤铁矿量子点/二维超薄石墨相氮化碳纳米片杂化材料（Fe₂O₃ QDs/g-C₃N₄ NS）。正如预期的那样，这种特殊设计的零维/二维结构对p-硝基苯酚的去除表现出显著的催化性能。凭借大表面积、充足的活性位点和强界面耦合，零维Fe₂O₃ QDs/二维g-C₃N₄纳米片通过局部面内碳物种建立了高效的电荷传输路径，加速了电子/空穴对的分离和转移。同时，高效的电荷迁移率可导致连续快速的Fe(III)/Fe(II)转化，促进光催化与H₂O₂化学活化之间的协同效应。所开发的碳插层零维/二维杂化材料为开发用于多种光电子应用的多相催化提供了新的见解，而不仅限于光芬顿催化。
