Plasmonic Nanocomposites of ZnO-Ag Produced by Laser Ablation and Their Photocatalytic Destruction of Rhodamine, Tetracycline and Phenol

Author:

Fakhrutdinova Elena D.1,Volokitina Anastasia V.12,Kulinich Sergei A.2ORCID,Goncharova Daria A.1,Kharlamova Tamara S.3ORCID,Svetlichnyi Valery A.1ORCID

Affiliation:

1. Laboratory of Advanced Materials and Technology, Tomsk State University, 634050 Tomsk, Russia

2. Research Institute of Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan

3. Laboratory of Catalytic Research, Tomsk State University, 634050 Tomsk, Russia

Abstract

Hydrosphere pollution by organic pollutants of different nature (persistent dyes, phenols, herbicides, antibiotics, etc.) is one of the urgent ecological problems facing humankind these days. The task of water purification from such pollutants can be effectively solved with the help of modern photocatalytic technologies. This article is devoted to the study of photocatalytic properties of composite catalysts based on ZnO modified with plasmonic Ag nanoparticles. All materials were obtained by laser synthesis in liquid and differed by their silver content and preparation conditions, such as additional laser irradiation and/or annealing of produced powders. The prepared ZnO-Ag powders were investigated by electron microscopy, X-ray diffraction and UV-Vis spectroscopy. Photocatalytic tests were carried out with well- known test molecules in water (persistent dye rhodamine B, phenol and common antibiotic tetracycline) using LED light sources with wavelengths of 375 and 410 nm. The introduction of small concentrations (up to 1%) of plasmonic Ag nanoparticles is shown to increase the efficiency of the ZnO photocatalyst by expanding its spectral range. Both the preparation conditions and material composition were optimized to obtain composite photocatalysts with the highest efficiency. Finally, the operation mechanisms of the material with different distribution of silver are discussed.

Funder

Tomsk State University Development Programme

Publisher

MDPI AG

Subject

General Materials Science

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