Metal Oxides as Photocatalysts: Processes, Properties, and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 2932

Special Issue Editors


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Laboratory for Chemistry of Rare and Rare Earth Elements, Department of Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia, 1164 Sofia, Bulgaria
Interests: materials science; inorganic synthesis; chemistry of rare earths; photocatalysis
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Laboratory for Chemistry of Rare and Rare Earth Elements, Department of Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia, 1164 Sofia, Bulgaria
Interests: inorganic synthesis; crystallography; powder XRD techniques
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Research on photocatalysis as a process for water purification, with the removal of various pollutants, began in the last century but is still relevant today. The important components of photocatalysis are the catalysts used—as a rule, substances with semiconducting properties and a structure allowing light absorption in the visible or ultraviolet region of the electromagnetic spectrum. Among the most commonly studied compounds as photocatalysts are the oxides of Ti(IV), Zn(II), Sn(IV), Ce(IV), which have shown efficiency in the decomposition of pollutants and their mineralization to harmless products. The metal oxides with properties of semiconductors are not limited to those mentioned above, and there remains the possibility to find new oxides which can lead to the development of new photocatalysts. That is why we are initiating the presented Special Issue “Metal Oxides as Photocatalysts: Processes, Properties, and Applications”. The intention is to cover research in the field of oxidation processes under light irradiation, modeling, and application of metal oxides as photocatalysts.

Among the possible topics considered, but not limited to:

  • Synthesis and characterization of metal and mixed metal oxide semiconductors;
  • Application of metal and mixed metal oxides as photocatalysts for decomposition of water pollutants;
  • Processes of water purification under UV and Vis light irradiation.

Prof. Dr. Maria Milanova
Dr. Martin Tsvetkov
Guest Editors

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Keywords

  • metal oxide semiconductors
  • heterogeneous photocatalysis
  • photo-fenton processes
  • preparation and properties of photocatalysts
  • mechanism of heterogeneous photocatalysis
  • decomposition of toxic pollutants by photocatalysis

Published Papers (1 paper)

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Research

18 pages, 4829 KiB  
Article
Modified Approach Using Mentha arvensis in the Synthesis of ZnO Nanoparticles—Textural, Structural, and Photocatalytic Properties
by Daniela Stoyanova, Irina Stambolova, Vladimir Blaskov, Petya Georgieva, Maria Shipochka, Katerina Zaharieva, Ognian Dimitrov, Pavel Markov, Vanya Dyakova, Yoanna Kostova, Ralitsa Mladenova, George Tzvetkov, Nelly Boshkova and Nikolai Boshkov
Appl. Sci. 2022, 12(3), 1096; https://doi.org/10.3390/app12031096 - 21 Jan 2022
Cited by 5 | Viewed by 2261
Abstract
Zinc oxide arouses considerable interest since it has many applications—in microelectronics, environmental decontaminations, biomedicine, photocatalysis, corrosion, etc. The present investigation describes the green synthesis of nanosized ZnO particles using a low-cost, ecologically friendly approach compared to the classical methods, which are aimed at [...] Read more.
Zinc oxide arouses considerable interest since it has many applications—in microelectronics, environmental decontaminations, biomedicine, photocatalysis, corrosion, etc. The present investigation describes the green synthesis of nanosized ZnO particles using a low-cost, ecologically friendly approach compared to the classical methods, which are aimed at limiting their harmful effects on the environment. In this study, ZnO nanoparticles were prepared using an extract of Mentha arvensis (MA) leaves as a stabilizing/reducing agent, followed by hydrothermal treatment at 180 °C. The resulting powder samples were characterized by X-ray diffraction (XRD) phase analysis, infrared spectroscopy (IRS), scanning electron microscopy (SEM), and electron paramagnetic resonance (EPR). The specific surface area and pore size distribution were measured by the Brunauer–Emmett–Taylor (BET) method. Electronic paramagnetic resonance spectra were recorded at room temperature and at 123 K by a JEOL JES-FA 100 EPR spectrometer. The intensity of the bands within the range of 400–1700 cm−1 for biosynthesized ZnO (BS-Zn) powders decreased with the increase in the Mentha arvensis extract concentration. Upon increasing the plant extract concentration, the relative proportion of mesopores in the BS-Zn samples also increased. It was established that the photocatalytic performance of the biosynthesized powders was dependent on the MA concentration in the precursor solution. According to EPR and PL analyses, it was proved that there was a presence of singly ionized oxygen vacancies (V0+) and zinc interstitials (Zni). The use of the plant extract led to changes in the morphology, phase composition, and structure of the ZnO particles, which were responsible for the increased photocatalytic rate of discoloration of Malachite Green dye. Full article
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