Xiang Bi, Gao-Hui Du, Li-Zhong Wang, Dong Zhao, Hao-Yu Xu, Yue Qiu, Le Dai
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Preparation of gray ZnO1−x photocatalyst containing oxygen vacancies for the highly efficient removal of nitric oxide and acetaminophen
“Defect engineering” has been considered as an effective strategy to improve photocatalytic activity of catalysts. ZnO1−x photocatalysts containing oxygen defects were prepared by the “oxygen-atom capture” method in different lithium-naphthalene solution. The effect of concentration of lithium-naphthalene solution on the oxygen vacancies and photocatalytic performance of ZnO was researched comprehensively. The results indicate that ZnO photocatalysts treated in lithium-naphthalene solution show disordered structure on the material due to the presence of oxygen vacancies. Compared with W-ZnO (white ZnO), ZnO1−x exhibits higher visible light absorption and enhanced photocatalytic properties. Moreover, more oxygen vacancies are introduced into ZnO-0.8, which reduce its bandgap to 3.04 eV and improve the separation efficiency and transfer speed of photo-generated carriers. Therefore, the efficiency of NO removal by ZnO-0.8 is enhanced to 54.3% under ultraviolet light irradiation, and its degradation efficiency of NO is ~ 12 times greater than that of W-ZnO. Oxygen vacancies acted as capturer of electrons, inhibiting the recombination of photogenerated electrons and holes. Thus, increasing the appropriate concentration of oxygen vacancies on the surface of the material can enhance its photocatalytic activity.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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