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Molecules
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Advances in TiO2 Based Photocatalysts and Their Composites
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Advances in TiO2 Based Photocatalysts and Their Composites

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Photochemistry".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 414

Special Issue Editor

Prof. Dr. Beata Tryba

E-Mail Website
Guest Editor
Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland
Interests: photocatalysis for air and water purification; material science; water technology; adsorption and adsorbents; photocatalysts based on TiO2; photocatalytic paints
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will be dedicated to new research studies relating to the application of photocatalytic processes with new materials based on TiO2 and its composites. TiO2 can be prepared as different structures, such as nanorods, nanotubes, spheres, nanosheets, and metal foams. These nanostructures provide unique properties of titania materials, which then affect the photocatalytic performance. Moreover, new hybrid materials have been prepared based on TiO2. The coupling of TiO2 with other materials, such as MOFs (Metal-Organic Frameworks), metal foams, polymers, graphene, or other carbon structures, often results in new and unique properties. Therefore, new applications of TiO2-based materials are still being reported. For example, the combination of the catalytic properties of some metals with the photocatalytic activity of TiO2 opens a wide area of applications for the acceleration of catalytic reactions. The activation of TiO2-based photocatalysts using solar light, with the utility of UV-Vis and IR, by modified TiO2 materials allows for the saving of energy consumption via the conversion of solar light. In this context, research studies referring to novel materials and their unique properties will be reported and discussed.

Prof. Dr. Beata Tryba
Guest Editor

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. Molecules is an international peer-reviewed open access semimonthly 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

  • TiO2 nanostructures
  • TiO2-based composites
  • thermo-photocatalytic activity
  • TiO2 activity under solar light
  • photo and catalytic properties of TiO2/metal
  • TiO2/MOFs structures

Published Papers (1 paper)

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Research

20 pages, 5155 KiB  
Article
Application of TiO2 Supported on Nickel Foam for Limitation of NOx in the Air via Photocatalytic Processes
by Beata Tryba, Bartłomiej Prowans, Rafał Jan Wróbel, Paulina Szołdra and Waldemar Pichór
Molecules 2024, 29(8), 1766; https://doi.org/10.3390/molecules29081766 - 12 Apr 2024
Viewed by 334
Abstract
TiO2 was loaded on the porous nickel foam from the suspended ethanol solution and used for the photocatalytic removal of NOx. Such prepared material was heat-treated at various temperatures (400–600 °C) to increase the adhesion of TiO2 with the [...] Read more.
TiO2 was loaded on the porous nickel foam from the suspended ethanol solution and used for the photocatalytic removal of NOx. Such prepared material was heat-treated at various temperatures (400–600 °C) to increase the adhesion of TiO2 with the support. Obtained TiO2/nickel foam samples were characterized by XRD, UV–Vis/DR, FTIR, XPS, AFM, SEM, and nitrogen adsorption at 77 K. Photocatalytic tests of NO abatement were performed in the rectangular shape quartz reactor, irradiated from the top by UV LED light with an intensity of 10 W/m2. For these studies, a laminar flow of NO in the air (1 ppm) was applied under a relative humidity of 50% and a temperature of 28 °C. Concentrations of both NO and NO2 were monitored by a chemiluminescence NO analyzer. The adsorption of nitrogen species on the TiO2 surface was determined by FTIR spectroscopy. Performed studies revealed that increased temperature of heat treatment improves adhesion of TiO2 to the nickel foam substrate, decreases surface porosity, and causes removal of hydroxyl and alcohol groups from the titania surface. The less hydroxylated surface of TiO2 is more vulnerable to the adsorption of NO2 species, whereas the presence of OH groups on TiO2 enhances the adsorption of nitrate ions. Adsorbed nitrate species upon UV irradiation and moisture undergo photolysis to NO2. As a consequence, NO2 is released into the atmosphere, and the efficiency of NOx removal is decreasing. Photocatalytic conversion of NO to NO2 was higher for the sample heated at 400 °C than for that at 600 °C, although coverage of nickel foam by TiO2 was lower for the former one. It is stated that the presence of titania defects (Ti3+) at low temperatures of its heating enhances the adsorption of hydroxyl groups and the formation of hydroxyl radicals, which take part in NO oxidation. Contrary to that, the presence of titania defects in TiO2 through the formation of ilmenite structure (NiTiO3) in TiO2/nickel foam heated at 600 °C inhibits its photocatalytic activity. No less, the sample obtained at 600 °C indicated the highest abatement of NOx due to the high and stable adsorption of NO2 species on its surface. Full article
(This article belongs to the Special Issue Advances in TiO2 Based Photocatalysts and Their Composites)
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