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Metal Oxide-Based Photocatalysts: Synthesis, Characterization and Application

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Materials Science".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 781

Special Issue Editor


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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: materials science; inorganic synthesis; chemistry of rare earths; photocatalysis
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Special Issue Information

Dear Colleagues,

Research on photocatalysis has attracted significant attention for water purification and pollutants removal since the last century. The important components of photocatalysis are the catalysts used, i.e., 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), and Ce(IV), which have shown efficiency in the decomposition of pollutants and their mineralization to harmless products. Metal oxides with properties of semiconductors are not limited to those mentioned above, and there remains the possibility of finding new oxides which can lead to the development of new photocatalysts. That is why we are initiating the presented Special Issue “Metal-Oxide-Based Photocatalysts: Synthesis, Characterization and Application”. The intention of this Issue is to cover research in the field of oxidation processes and mechanisms under light irradiation, modeling, and the application of metal-oxide-based photocatalysts from a molecular perspective.

The topics for this Special Issue include, but are not limited to:

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

Prof. Dr. Maria Milanova
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

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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

28 pages, 8302 KiB  
Article
The Fabrication and Property Characterization of a Ho2YSbO7/Bi2MoO6 Heterojunction Photocatalyst and the Application of the Photodegradation of Diuron under Visible Light Irradiation
by Liang Hao and Jingfei Luan
Int. J. Mol. Sci. 2024, 25(8), 4418; https://doi.org/10.3390/ijms25084418 - 17 Apr 2024
Viewed by 399
Abstract
A novel photocatalytic nanomaterial, Ho2YSbO7, was successfully synthesized for the first time using the solvothermal synthesis technique. In addition, a Ho2YSbO7/Bi2MoO6 heterojunction photocatalyst (HBHP) was prepared via the hydrothermal fabrication technique. Extensive [...] Read more.
A novel photocatalytic nanomaterial, Ho2YSbO7, was successfully synthesized for the first time using the solvothermal synthesis technique. In addition, a Ho2YSbO7/Bi2MoO6 heterojunction photocatalyst (HBHP) was prepared via the hydrothermal fabrication technique. Extensive characterizations of the synthesized samples were conducted using various instruments, such as an X-ray diffractometer, a Fourier transform infrared spectrometer, a Raman spectrometer, a UV-visible spectrophotometer, an X-ray photoelectron spectrometer, and a transmission electron microscope, as well as X-ray energy dispersive spectroscopy, photoluminescence spectroscopy, a photocurrent test, electrochemical impedance spectroscopy, ultraviolet photoelectron spectroscopy, and electron paramagnetic resonance. The photocatalytic activity of the HBHP was evaluated for the degradation of diuron (DRN) and the mineralization of total organic carbon (TOC) under visible light exposure for 152 min. Remarkable removal efficiencies were achieved, with 99.78% for DRN and 97.19% for TOC. Comparative analysis demonstrated that the HBHP exhibited markedly higher removal efficiencies for DRN compared to Ho2YSbO7, Bi2MoO6, or N-doped TiO2 photocatalyst, with removal efficiencies 1.13 times, 1.21 times, or 2.95 times higher, respectively. Similarly, the HBHP demonstrated significantly higher removal efficiencies for TOC compared to Ho2YSbO7, Bi2MoO6, or N-doped TiO2 photocatalyst, with removal efficiencies 1.17 times, 1.25 times, or 3.39 times higher, respectively. Furthermore, the HBHP demonstrated excellent stability and reusability. The mechanisms which could enhance the photocatalytic activity remarkably and the involvement of the major active species were comprehensively discussed, with superoxide radicals identified as the primary active species, followed by hydroxyl radicals and holes. The results of this study contribute to the advancement of efficient heterostructural materials and offer valuable insights into the development of sustainable remediation strategies for addressing DRN contamination. Full article
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