氧化铜纳米晶体的形状依赖性合成及其光催化降解：动力学与光催化机理

Shape-dependent synthesis and photocatalytic degradation by CuO nanocrystals: Kinetics and photocatalytic mechanism.

作者信息

Zhang Yuanyuan, Zhang Zhenhuan, Zhang Yue, Li Yue, Yuan Yuan

机构信息

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

Micro/Nanotechnology Research Centre, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

出版信息

J Colloid Interface Sci. 2023 Dec;651:117-127. doi: 10.1016/j.jcis.2023.07.196. Epub 2023 Jul 30.

DOI:10.1016/j.jcis.2023.07.196

PMID:37542887

Abstract

In this study, CuO crystals with different morphologies were synthesized to investigate the effect of exposed crystalline facets on photocatalytic degradation efficiency. By adjusting the addition amount of PVP, different morphologies of CuO crystals were obtained, such as cubic, decahedral, octahedral, etc. XRD, SEM, and TEM characterizations were used to observe the properties of the synthesized CuO in terms of morphology, size, and lattice structure. The results showed that the octahedral cuprous oxide had the strongest photocatalytic degradation effect (78.3%). The study also explored the connection between different crystalline facets and MO microstructure, and the effect of crystalline facet selectivity on the pre-absorption and photocatalytic degradation of MO. Density Functional Theory (DFT) calculations were used to investigate the connection between the energy level structure of different crystalline facets of CuO and its photocatalytic activity. Finally, based on the experimental analysis and theoretical calculation, a new charge separation model on crystalline surface was proposed.

摘要

在本研究中，合成了具有不同形貌的CuO晶体，以研究暴露晶面对光催化降解效率的影响。通过调整聚乙烯吡咯烷酮（PVP）的添加量，获得了不同形貌的CuO晶体，如立方体形、十面体形、八面体形等。利用X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）表征手段，从形貌、尺寸和晶格结构方面观察合成的CuO的性能。结果表明，八面体氧化亚铜具有最强的光催化降解效果（78.3%）。该研究还探索了不同晶面与亚甲基蓝（MO）微观结构之间的联系，以及晶面选择性对MO预吸附和光催化降解的影响。采用密度泛函理论（DFT）计算研究了CuO不同晶面的能级结构与其光催化活性之间的联系。最后，基于实验分析和理论计算，提出了一种新的晶体表面电荷分离模型。