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Catalysts
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TiO2 Photocatalysts—Towards Sustainable Chemistry
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TiO2 Photocatalysts—Towards Sustainable Chemistry

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

Deadline for manuscript submissions: 31 August 2025 | Viewed by 2548

Special Issue Editors

Prof. Dr. Jovan M. Nedeljkovic

E-Mail Website
Guest Editor
Vinča Institute of Nuclear Sciences—National Institute of the Republic of Serbia, University of Belgrade, 11001 Belgrade, Serbia
Interests: photocatalysis; composite nanomaterials; interfacial charge transfer complexes; green nanomaterials; inorganic-organic hybrids; antimicrobial properties of hybrid nanomaterials
Special Issues, Collections and Topics in MDPI journals
Dr. Vesna Lazić

E-Mail Website
Guest Editor
Vinča Institute of Nuclear Sciences—National Institute of the Republic of Serbia, University of Belgrade, 11001 Belgrade, Serbia
Interests: metal and metal oxide nanoparticles; composite nanomaterials; photocatalysis; antimicrobial properties and toxicity of nanoparticles; green synthesis of metal nanoparticles; nanoparticles as a chemical sensor; enzyme immobilization using nanoparticles
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Chemical processes, such as advanced oxidation processes (AOPs), have received significant attention regarding their application in water treatment. Among these processes, semiconductor photocatalysis, especially with titanium dioxide (TiO2), has been studied in detail with regard to the elimination of selected micropollutants in water. This inexpensive, stable, and non-toxic catalyst offers excellent removal efficiencies. TiO2 photocatalysts exhibit applicative potential in the decontamination of wastewater, exhaust gases, and disinfection. High-efficiency TiO2-based photocatalysts have also been successfully employed in photocatalytic water splitting and photoconversion, enabling the low-cost and environmentally friendly production of clean fuels. However, due to the energy band gap, the practicality of employing natural solar light is limited. The application of visible light in TiO2 photocatalysis is currently the main goal of research.

This Special Issue aims to provide an overview of recent developments in methods promoting the visible light photocatalytic activity of TiO2, including metal and non-metal doping, the surface deposition of noble metals, semiconductor coupling, and dye sensitizing. Furthermore, this Special Issue aims to address the mechanism of photocatalysis, photocatalytic ozonation, photoconversion, and water splitting.

Prof. Dr. Jovan M. Nedeljkovic
Dr. Vesna Lazić
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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 2200 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

  • photocatalytic ozonation
  • visible light application
  • mechanism investigation
  • structure modification
  • structure characterization
  • water splitting
  • hydrogen production
  • photoconversion

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Published Papers (2 papers)

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Research

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16 pages, 9711 KiB  
Article
Cr3+-Doped Anatase-Phase TiO2 Nanocrystals with (101) and (004) Dominant Facets: Synthesis and Characterization
by Rayhan Hossain and Allen Apblett
Catalysts 2025, 15(1), 33; https://doi.org/10.3390/catal15010033 - 2 Jan 2025
Viewed by 800
Abstract
Anatase-phase rod-shaped TiO2 nanocrystals are prepared by the solvothermal method, the surface is metalated, and doped nanocrystals are achieved by thermal diffusion of surface metal ions. Incorporation of dopant ions into TiO2 lattice enhances the visible light absorption of the material [...] Read more.
Anatase-phase rod-shaped TiO2 nanocrystals are prepared by the solvothermal method, the surface is metalated, and doped nanocrystals are achieved by thermal diffusion of surface metal ions. Incorporation of dopant ions into TiO2 lattice enhances the visible light absorption of the material and in some cases can increase the rate of photocatalysis. Even though there are overflowing studies on the preparation of doped TiO2 materials, there are no methods that enable the precise control of dopant concentration in TiO2 nanocrystals. We have developed a method to load the surface of oleic acid stabilized anatase-phase rod-shaped TiO2 nanocrystals (approx. 3 ± 1 nm diameter and 40 ± 10 nm long) with transition metal ions followed by ion diffusion to prepare metal-doped nanocrystals with exact control of the dopant concentration. Specifically, in this work, Cr3+ adsorbs TiO2 nanorods to yield a green colloid, followed by ion diffusion at elevated temperature. After removal of any remaining surface Cr3+, tan-colored chromium-doped TiO2 nanorods can be obtained. Electron microscopy and powder X-ray diffraction indicate no change in nanocrystal size and morphology throughout the process. The TiO2 nanorods play an important role in photocatalysis owing to their excellent chemical and physical properties. Titanium dioxide is a low-cost, non-toxic, highly stable, chemically robust material. Doped TiO2 materials have found application in photocatalysis (oxidative degradation of organic molecules, hydrogen evolution), photovoltaics, solar cells, lithium-ion batteries, supercapacitors, and sensors. TiO2 photocatalysis is also the basis for clean energy technologies, such as dye-sensitized solar cells and photoelectrochemical cells. In photocatalysis applications, nanocrystalline TiO2 presents advantages of a high surface area, ability to control the surface facet, and minimized bulk recombination. Full article
(This article belongs to the Special Issue TiO2 Photocatalysts—Towards Sustainable Chemistry)
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Review

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29 pages, 7114 KiB  
Review
Photocatalytic Reactions over TiO2-Based Interfacial Charge Transfer Complexes
by Vesna Lazić and Jovan M. Nedeljković
Catalysts 2024, 14(11), 810; https://doi.org/10.3390/catal14110810 - 11 Nov 2024
Cited by 3 | Viewed by 1273
Abstract
The present review is related to the novel approach for improvement of the optical properties of wide bandgap metal oxides, in particular TiO2, based on the formation of the inorganic–organic hybrids that display absorption in the visible spectral range due to [...] Read more.
The present review is related to the novel approach for improvement of the optical properties of wide bandgap metal oxides, in particular TiO2, based on the formation of the inorganic–organic hybrids that display absorption in the visible spectral range due to the formation of interfacial charge transfer (ICT) complexes. We outlined the property requirements of TiO2-based ICT complexes for efficient photo-induced catalytic reactions, emphasizing the simplicity of the synthetic procedure, the possibility of the fine-tuning of the optical properties supported by the density functional theory (DFT) calculations, and the formation of a covalent linkage between the inorganic and organic components of hybrids, i.e., the nature of the interface. In addition, this study provides a comprehensive insight into the potential applications of TiO2-based ICT complexes in photo-driven catalytic reactions (water splitting and degradation of organic molecules), including the identification of the reactive species that participate in photocatalytic reactions by the spin-trapping electron paramagnetic resonance (EPR) technique. Considering the practically limitless number of combinations between the inorganic and organic components capable of forming oxide-based ICT complexes and with the knowledge that this research area is unexplored, we are confident it is worth studying, and we emphasized some further perspectives. Full article
(This article belongs to the Special Issue TiO2 Photocatalysts—Towards Sustainable Chemistry)
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