Advances in the Synthesis and Applications of Transition/Noble Metal Oxide Photocatalysts, 2nd Edition

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Photocatalysis".

Deadline for manuscript submissions: 1 August 2024 | Viewed by 5404

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Laboratory of Science and Technology of Nanoparticles, Faculty of Chemistry and Pharmacy, University of Sofia, J. Bourchier 1, 1164 Sofia, Bulgaria
Interests: heterogeneous photocatalysis; pharmaceutical drug; organic dyes; semiconductor nanomatirials
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Special Issue Information

Dear Colleagues,

In recent years, photocatalysis, due to its high efficiency, safety and profitability, has become an effective technology for solving environmental problems, for example, in wastewater treatment for the removal of organic pollutants. Despite all the positives of semiconductor photocatalysts, they have disadvantages, such as the fast recombination rate of photogenerated electron–hole pairs, low quantum yield and high band gap value. The rapid recombination of the photogenerated pairs (e−/h+), following the energy activation of the catalyst, inhibits the redox process, and thus results in reduced photocatalytic activity. It is necessary to study a method for optimizing the semiconductor structure in order to improve separation efficiency and to inhibit recombination efficiency toward enhancing the photocatalytic properties of the semiconductor. The recombination process decreases when the surface of the semiconductor is modified by transition/noble metals. Therefore, photocatalysts modified with transition/noble metal oxides can enhance the photocatalytic decomposition of organic pollutants in wastewater.

The aim of the Special Issue “Advances in the Synthesis and Applications of Transition/Noble Metal Oxide Photocatalysts” is to serve scientists through the prompt publication of significant advances in solving environmental problems via photocatalysts. In this context, we request that you submit your articles to our Special Issue on or before 15 December 2023, so that it may be included article in the upcoming Special Issue.

Dr. Nina Kaneva
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. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • transition/noble metal oxides
  • photocatalysts
  • organic pollutants
  • water purification

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Published Papers (2 papers)

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Research

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13 pages, 3713 KiB  
Article
Effect of Ultraviolet Illumination on the Fixation of Silver Ions on Zinc Oxide Films and Their Photocatalytic Efficiency
by Dobrina Ivanova, Ralitsa Mladenova, Hristo Kolev and Nina Kaneva
Catalysts 2023, 13(7), 1121; https://doi.org/10.3390/catal13071121 - 18 Jul 2023
Cited by 4 | Viewed by 1503
Abstract
This study focuses on the fabrication and characterization of nanostructured zinc oxide films deposited on glass substrates using sol–gel dip-coating methods. The thin films are functionalized with silver ions at various Ag+ concentrations (10−2, 10−3, 10−4 M) [...] Read more.
This study focuses on the fabrication and characterization of nanostructured zinc oxide films deposited on glass substrates using sol–gel dip-coating methods. The thin films are functionalized with silver ions at various Ag+ concentrations (10−2, 10−3, 10−4 M) through room temperature ion fixation process with and without ultraviolet (UV) illumination. Physicochemical characterization techniques, such as employing Scanning Electron Microscopy with Energy-dispersive X-ray spectroscopy (SEM-EDX), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Ultraviolet–Visible Spectroscopy and Electron Paramagnetic Resonance (EPR) techniques. The SEM-EDX and XRD confirmed a characteristic ganglia-like structure with a hexagonal crystalline structure. The photocatalytic performance and available surface area of the pure and Ag films are investigated in the removal of methylene blue dye under UV and visible light illumination and in darkness. It is observed that the photocatalytic activity increases proportionally to the Ag+ ion concentration: ZnO < Ag(10−4 M)/ZnO, < Ag(10−3 M)/ZnO < Ag(10−2 M)/ZnO. Moreover, the catalysts modified under UV illumination during the fixation treatment (Ag-UV/ZnO) exhibited a higher photocatalytic efficiency and degraded the dye in comparison with those without a light source (Ag/ZnO). The experimental results are confirmed using total organic carbon (TOC) analysis. The optimal silver concentration (10−2 M) is established, which shows the highest photocatalytic efficiency (in both cases of ion fixation treatment). The results can be used as a guideline for the development of co-catalyst-functionalized semiconductor photocatalysts. Full article
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Review

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25 pages, 841 KiB  
Review
Advances in Green Synthesis of Metal Oxide Nanoparticles by Marine Algae for Wastewater Treatment by Adsorption and Photocatalysis Techniques
by Ahmed E. Alprol, Abdallah Tageldein Mansour, Abdelwahab M. Abdelwahab and Mohamed Ashour
Catalysts 2023, 13(5), 888; https://doi.org/10.3390/catal13050888 - 15 May 2023
Cited by 21 | Viewed by 3528
Abstract
The use of algae-based green synthesis of metal oxide nanoparticles (MONPs) for bioremediation is an environmentally friendly and cost-effective alternative to conventional approaches. Algal-mediated synthesis offers several benefits over other biogenic processes, such as plants, bacteria, and fungi, including ease of synthesis, scalability, [...] Read more.
The use of algae-based green synthesis of metal oxide nanoparticles (MONPs) for bioremediation is an environmentally friendly and cost-effective alternative to conventional approaches. Algal-mediated synthesis offers several benefits over other biogenic processes, such as plants, bacteria, and fungi, including ease of synthesis, scalability, and rapid synthesis. Algae are readily available in nature, nontoxic, and can produce various types of metal oxide nanoparticles. This approach could significantly accelerate the development of novel algae-nanomaterials with improved properties and performance, leading to more efficient and cost-effective bioremediation of pollutants from water solutions, seawater, and industrial effluent. This review focuses on the biogenic fabrication of metal oxide nanoparticles based on aquatic plants (microalgae and seaweeds) due to their many advantages and attractive applications in pollutant remediation from aqueous solutions. Additionally, photocatalysis is highlighted as a promising tool for the remediation of industrial effluents due to its efficacy, ease of use, quick oxidation, cost-effectiveness, and reduced synthesis of harmful byproducts. Full article
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