g-C3N4/oxygen-deficient BiOCl nanocomposite assisted by distinguished properties of graphene quantum dots for the efficient photocatalytic removal of organic vapors

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2019-11-01 DOI:10.1016/j.apsusc.2019.07.085

Jong Uk Choi, Wan-Kuen Jo

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引用次数: 18

Abstract

In this study, photocatalytic properties of a graphene carbon nitride (g-C₃N₄) oxygen-deficient BiOCl (ODBOC) nanocomposite, which was assisted by the distinguished properties of graphene quantum dots (GQDs/gCN/ODBOC), in the decomposition of harmful organic vapors were investigated. The GQDs/gCN/ODBOC ternary composite was prepared using a facile chemical-mixing method. The presence of oxygen vacancies in ODBOC and the GQDs/gCN/ODBOC nanocomposite was confirmed by electron spin resonance and X-ray photoelectron spectroscopy. Compared to pristine BiOCl, ODBOC exhibited a higher performance, while compared with those of the selected photocatalyst counterparts, GQDs/gCN/ODBOC exhibited a higher performance; particularly, the removal efficiency of hexanal over this catalyst increased up to 95%. The superior performance of the above photocatalyst was related to two distinguished properties of GQDs: improved visible-light absorption by their upconverted photoluminescence and promoted charge-separation ability by their electron attraction properties, as well as the Z-scheme charge transfer at the junctions between g-C₃N₄ and ODBOC. In addition, the GQDs/gCN/ODBOC fabricated using a GQD solution of 5 mL revealed the highest performance and satisfactory photochemical stability during recycling tests. Finally, the photocatalytic mechanism for the pollutant degradation over GQDs/gCN/ODBOC was proposed on the basis of band-energy structures and hydroxyl radical measurements.

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石墨烯量子点辅助下g-C3N4/缺氧BiOCl纳米复合材料的高效光催化去除有机蒸汽

本研究利用石墨烯量子点(GQDs/gCN/ODBOC)的独特性质，研究了氮化碳石墨烯(g-C3N4)缺氧BiOCl (ODBOC)纳米复合材料分解有害有机气体的光催化性能。采用简便的化学混合法制备了GQDs/gCN/ODBOC三元复合材料。通过电子自旋共振和x射线光电子能谱证实了ODBOC和GQDs/gCN/ODBOC纳米复合材料中存在氧空位。与原始BiOCl相比，ODBOC表现出更高的性能，而与选定的光催化剂相比，GQDs/gCN/ODBOC表现出更高的性能;特别是对己醛的去除率提高到95%以上。上述光催化剂的优异性能与GQDs的两个特性有关:通过其上转换光致发光改善可见光吸收，通过其电子吸引特性提高电荷分离能力，以及在g-C3N4和ODBOC之间的连接处进行Z-scheme电荷转移。此外，使用5 mL的GQD溶液制备的GQDs/gCN/ODBOC在回收测试中表现出最高的性能和满意的光化学稳定性。最后，基于能带能结构和羟基自由基测量，提出了GQDs/gCN/ODBOC光催化降解污染物的机理。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.