Cutting-Edge Photocatalysis

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

Deadline for manuscript submissions: 30 September 2024 | Viewed by 2864

Special Issue Editor


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Guest Editor
Department of Chemistry, The University of Sheffield, Sheffield, UK
Interests: theoretical and computational chemistry; surfaces and interfaces; materials for photocatalysis and solar cells

Special Issue Information

Dear Colleagues, 

Photocatalysis has attracted a great deal of interest because of the ability of photocatalysts to harvest sunlight and drive a variety of chemical reactions. Photocatalytic processes have the potential to solve a variety of environmental problems, ranging from removing pollutants from water and air, to capturing carbon dioxide and converting it to useful chemical feedstocks, and producing hydrogen—a “clean” fuel—from water. All of these processes rely on efficient and selective photocatalysts. One of the earliest photocatalysts, titanium dioxide, is still one of the most important photocatalyst materials, offering high efficiency, low cost, and the ability to tune its morphology. However, it has significant weaknesses, such as poor visible light absorption and detrimental charge recombination. The search for alternative improved photocatalysts has led to a huge amount of research into novel photocatalyst materials, such as mixed oxides, graphitic carbon nitride, polymeric and molecular photocatalysts, as well as modifications of their electronic and optical properties by doping and by control of their morphology. Composite photocatalyst systems, e.g., heterojunctions of metal oxides with efficient light absorbers such as chalcogenides, graphene and carbon nanotubes, and molecular photosensitizers, offer improved light absorption and charge separation ability and therefore result in high photocatalytic efficiencies.

This Special Issue covers experimental and theoretical research on cutting-edge photocatalysts, such as:

  • Novel photocatalyst materials;
  • Doping of photocatalyst materials;
  • Control of photocatalysts’ morphology;
  • Photocatalytic heterojunctions, e.g., Z-schemes;
  • Photocatalyst–molecular sensitizer systems;
  • Visible-light photocatalysis.

Dr. Natalia Martsinovich
Guest Editor

Manuscript Submission Information

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Keywords

  • photocatalyst
  • doping
  • heterojunction
  • Z-scheme
  • photosensitizer

Published Papers (3 papers)

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Research

16 pages, 5934 KiB  
Article
Modification of α-Fe2O3 Nanoparticles with Carbon Layer for Robust Photo-Fenton Catalytic Degradation of Methyl Orange
by Muhammad Qasim, Mohamed A. Ghanem, Xuecheng Cao and Xiaojie Li
Catalysts 2024, 14(6), 393; https://doi.org/10.3390/catal14060393 (registering DOI) - 20 Jun 2024
Abstract
The degradation of organic dyes poses a significant challenge in achieving sustainable environmental solutions, given their extensive usage across various industries. Iron oxide (Fe2O3) nanoparticles are studied as a reliable technique for remediating dye degradation. The objective of this [...] Read more.
The degradation of organic dyes poses a significant challenge in achieving sustainable environmental solutions, given their extensive usage across various industries. Iron oxide (Fe2O3) nanoparticles are studied as a reliable technique for remediating dye degradation. The objective of this research is to improve methods of nanomaterial-based environmental remediation. The solvothermal technique is used to synthesize carbon-modified Fe2O3 nanoparticles that exhibit the capability to modify their size morphology and increase reactivity, and stability for MO photodegradation. Their inherent qualities render them highly advantageous for biomedical applications, energy storage, environmental remediation, and catalysis. The mean crystallite size of the modified Fe2O3 nanoparticles is approximately 20 nm. These photocatalysts are tested for their ability to degrade methyl orange (MO) under Visible light radiation and in presence of hydrogen peroxide reagent. The optimal degradation efficiency (97%) is achieved with Fe2O3@C in the presence of H2O2 by meticulously controlling the pH, irradiation time, and photocatalyst dosage. The enhanced photocatalytic activity of the Fe2O3@C nanoparticles, compared to pure Fe2O3, is attributed to the conductive carbon layer, which significantly reduces electron-hole recombination rates. To summarize, Fe2O3@C nanoparticles not only offer a promising technique for the degradation of MO dye pollutants but also have an advantage for environmental remediation due to their increased stability and reactivity. Full article
(This article belongs to the Special Issue Cutting-Edge Photocatalysis)
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9 pages, 417 KiB  
Communication
Heat-Transfer Analysis of the Promotion of the CO2 Reduction Performance of a P4O10/TiO2 Photocatalyst Using a Black Body Material
by Akira Nishimura, Ryo Hanyu, Homare Mae, Hiroki Senoue and Eric Hu
Catalysts 2023, 13(12), 1477; https://doi.org/10.3390/catal13121477 - 28 Nov 2023
Viewed by 792
Abstract
Since photocatalytic reactions are surface reactions, enhancing gas movement around the photocatalyst could improve photocatalytic CO2 reduction performance. A new approach using black body material to enhance the gas movement around the photocatalyst based on the natural thermosiphon movement of gases around [...] Read more.
Since photocatalytic reactions are surface reactions, enhancing gas movement around the photocatalyst could improve photocatalytic CO2 reduction performance. A new approach using black body material to enhance the gas movement around the photocatalyst based on the natural thermosiphon movement of gases around a photocatalyst has been proposed and confirmed experimentally, but the heat-transfer mechanism of the phenomena has not yet been clarified. The aim of this study is to clarify the corresponding heat-transfer mechanism. This study calculated the temperature of the CO2/NH3 gas mixture around a P4O10/TiO2 photocatalyst using the heat-transfer formula. No difference was found between the temperature increase (Tg) from the temperature at the beginning of the CO2 reduction experiment (Tini) and the temperature of the CO2/NH3 gas mixture measured experimentally via thermocouple (Te) under the following illumination conditions: a Xe lamp with visible light (VIS) + infrared light (IR) and IR only. The heat-transfer model proposed in this study predicts Tg well under illumination from a Xe lamp with VIS + IR as well as under IR illumination only. On the other hand, the difference found between Tg and Te was as large as 10 °C under illumination from a Xe lamp with ultraviolet light (UV) + VIS + IR. Full article
(This article belongs to the Special Issue Cutting-Edge Photocatalysis)
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17 pages, 5597 KiB  
Article
Hollow Nanospheres Organized by Ultra-Small CuFe2O4/C Subunits with Efficient Photo-Fenton-like Performance for Antibiotic Degradation and Cr(VI) Reduction
by Dazhi Sun, Jiayi Yang, Feng Chen, Zhe Chen and Kangle Lv
Catalysts 2022, 12(7), 687; https://doi.org/10.3390/catal12070687 - 23 Jun 2022
Cited by 5 | Viewed by 1624
Abstract
Hollow transition metal oxides have important applications in the degradation of organic pollutants by a photo-Fenton-like process. Herein, uniform, highly dispersible hollow CuFe2O4/C nanospheres (denoted as CFO/C-PNSs) were prepared by a one-pot approach. Scanning electron microscope (SEM) and transmission [...] Read more.
Hollow transition metal oxides have important applications in the degradation of organic pollutants by a photo-Fenton-like process. Herein, uniform, highly dispersible hollow CuFe2O4/C nanospheres (denoted as CFO/C-PNSs) were prepared by a one-pot approach. Scanning electron microscope (SEM) and transmission electron microscope (TEM) images verified that the CFO/C-PNS catalyst mainly presents hollow nanosphere morphology with a diameter of 250 ± 30 nm. Surprisingly, the photodegradation test results revealed that CFO/C-PNSs had an excellent photocatalytic performance in the elimination of various organic contaminants under visible light through the efficient Fenton catalytic process. Due to the unique hollow structure formed by the assembly of ultra-small CFO/C subunits, the catalyst exposes more reaction sites, improving its photocatalytic activity. More importantly, the resulting magnetically separable CFO/C-PNSs exhibited excellent stability. Finally, the possible photocatalytic reaction mechanism of the CFO/C-PNSs was proposed, which enables us to have a clearer understanding of the photo-Fenton mechanism. Through a series of characterization and analysis of degradation behavior of CFO/C-PNS samples over antibiotic degradation and Cr(VI) reduction, •OH radicals generated from H2O2 decomposition played an essential role in enhancing the reaction efficiency. The present work offered a convenient method to fabricate hollow transition metal oxides, which provided impetus for further development in environmental and energy applications. Highlights: Novel hollow CuFe2O4/C nanospheres were prepared by a facile and cost-effective method. CuFe2O4/C exhibited excellent photo-Fenton-like performance for antibiotic degradation. Outstanding photocatalytic performance was attributed to the specific hollow cavity-porous structure. A possible mechanism for H2O2 activation over hollow CuFe2O4/C nanospheres was detailed and discussed. Full article
(This article belongs to the Special Issue Cutting-Edge Photocatalysis)
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