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Special Issue "TiO2-based Nanostructures, Composites and Hybrid Photocatalysts"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials".

Deadline for manuscript submissions: 30 November 2019

Special Issue Editor

Guest Editor
Dr. Stefano Lettieri

National Research Council of Italy, Institute of Applied Sciences and Intelligent Systems "Eduardo Caianiello" (ISASI-CNR), Pozzuoli, Italy
Website | E-Mail
Interests: multifunctional metal oxides; semiconductor nanostructures; photocatalytic materials; titanium dioxide; semiconductor optics; non-linear optical spectroscopy; photoluminescence; gas sensing; optical sensors

Special Issue Information

Dear Colleagues,

Environmental pollution and depletion of fossil fuels represent two crucial obstacles for the sustainable development of contemporary human society. It is becoming more and more imperative to accelerate the develompment of green technologies capable to control and reduce pollution growth. Hence, it can be easily foreseen that confronting these issues will engage increasing efforts and resources.

Among the research and development fields dealing with the mentioned issues, those employing photocatalysis are likely to grow in relevance and spread new applications and technologies. Titanium dioxide (TiO2) is nowdays one of the most widely used photocatalytic materials due to its ability to oxidatively decompose organic pollutants, low cost, durability and corrosion resistance. It is employed in several applications in the energy and environmental fields, including, for example: hydrogen evolution, photoelectrochemical conversion, photodegradation of organic contaminants, air and water purification systems, sterilization and bacterial detoxification. TiO2 also proved to be useful for other applications, such as gas sensing, bone implant fixation, drug delivery, etc.

Much effort is nowdays focusing on TiO2 modifications enambling to extend the TiO2 optical absorption toward the visible range (in order to operate effectively under natural sunlight irradiation) and to improve the spatial separation of photogenerated charges. To these aims, several TiO2 doping strategies and TiO2-based hybrid composites have been scrutinized. In these kind of studies, foundational knowledge of the basic physical and chemical properties of the involved materials/components involved is required, as well as exhaustive investigations of the targeted application.  

The aim of this Special Issue is to cover the main aspects of fundamental and applied research of TiO2 and TiO2-based materials and composites, such as (but not limited to) the following:

  • Fundamental properties of TiO2 nanostructures: electronic states, defects, structural properties, optical properties, etc.
  • Synthesis of bulk TiO2 crystals, TiO2 nanoparticles and thin films  
  • Modification of TiO2 nanostructures through doping, including non-metal doping (e.g. nitrogen-doped TiO2, fluorine-doped TiO2, carbon-doped TiO2, etc.) and metal doping (e.g. Fe/TiO2, Cu/TiO2, Au/TiO2, Ag/TiO2, Pd/TiO2, Pt/TiO2, etc.)
  • Self-doped TiO2 nanostructures: oxygen vacancies, black titania, etc.
  • Composites and hybrid photocatalysts based on TiO2 and carbon nanomaterials (e.g. TiO2/graphene, TiO2/graphene oxide, TiO2/carbon nanotubes, TiO2/g-C3N4, etc.) or on TiO2  and inorganic materials (e.g. TiO2/MoS2 and other 2D transition metal dichalcogenides)
  • Applications, including water remediation, degradation of dyes and/or farmaceuticals, CO2 reduction, hydrogen evolution, fuels production, plasmonic photocatalysis, TiO2-based composites in perovskite solar cells, gas sensors, biosensors and biomedical applications, etc.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Stefano Lettieri
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 papers will be 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. Materials 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 1800 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-based nanostructures and composites
  • photocatalysis
  • TiO2-based hybrid photocatalysts
  • water remediation
  • environmental applications and green technologies
  • CO2 reduction
  • hydrogen production
  • energy applications

Published Papers (2 papers)

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Research

Open AccessFeature PaperArticle Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity
Materials 2019, 12(6), 873; https://doi.org/10.3390/ma12060873
Received: 22 February 2019 / Revised: 8 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
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Abstract
In this paper, nanostructured TiO2 film was prepared by the by sol-gel process and dip-coating technique with titanium tetraisopropoxide as a precursor. After heat treatment at 550 °C, the deposited film was characterized by means of micro-Raman spectroscopy and atomic force microscopy [...] Read more.
In this paper, nanostructured TiO2 film was prepared by the by sol-gel process and dip-coating technique with titanium tetraisopropoxide as a precursor. After heat treatment at 550 °C, the deposited film was characterized by means of micro-Raman spectroscopy and atomic force microscopy (AFM). It was found that the TiO2 film consisted of only the TiO2 anatase phase and showed a granular microstructure. Photocatalytic degradation of azithromycin by using sol-gel nanostructured TiO2 film was studied to define the most effective degradation process for potential use in wastewater treatment. Different factors were evaluated during photocatalysis, such as pH (3, 7, and 10), water matrix (ultrapure water and synthetic municipal waste water effluent), influence of another pharmaceutically active compound (sulfamethoxazole, one of the most often detected pharmaceutic compounds in waste waters), and radiation sources (low pressure ultraviolet (UV) mercury lamps with a UV-A and UV-C range; a light-emitting diode (LED) lamp with a radiation peak at 365 nm). The most effective degradation process was achieved with the UV-C irradiation source in matrices at pH 10. The water matrix had little effect on the photocatalytic degradation rates of azithromycin. The presence of sulfamethoxazole in the water matrix decreased the degradation rate of azithromycin, however, only in matrices with a pH level adjusted to 10. During the experiments, five azithromycin degradation products were identified and none of them showed toxic properties, suggesting effective removal of azithromycin. LED 365 nm as the irradiation source was not as effective as the UV-C lamp. Nevertheless, considering the cost, energy efficiency, and environmental aspects of the irradiation source, the LED lamp could be a “real-life” alternative. Full article
(This article belongs to the Special Issue TiO2-based Nanostructures, Composites and Hybrid Photocatalysts)
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Open AccessArticle Effect of Ru, Rh, Mo, and Pd Adsorption on the Electronic and Optical Properties of Anatase TiO2(101): A DFT Investigation
Materials 2019, 12(5), 814; https://doi.org/10.3390/ma12050814
Received: 4 December 2018 / Revised: 26 February 2019 / Accepted: 6 March 2019 / Published: 10 March 2019
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Abstract
Adsorbed metal atoms and metal doping onto TiO2 can effectively enhance the optical and photocatalytic activity of photocatalytic efficiency of titanium dioxide (TiO2), favoring the extension of its optical absorption spectrum and the efficiency of hydrogen generation. To investigate the [...] Read more.
Adsorbed metal atoms and metal doping onto TiO2 can effectively enhance the optical and photocatalytic activity of photocatalytic efficiency of titanium dioxide (TiO2), favoring the extension of its optical absorption spectrum and the efficiency of hydrogen generation. To investigate the possible mechanism causing potential improvement of photocatalytic activity, the electronic and optical properties of the anatase TiO2(101) plane with different adsorbed metal atom have been theoretically calculated through density functional theory (DFT) method. Adsorption of Pd and Ru atoms increases the delocalization of the density of states, with an impurity state near the Fermi level. Moreover, the investigated adsorbed metal atoms (Mo, Pd, Ru, Rh) narrow the band gap of anatase TiO2, thus enhancing the probability of photoactivation by visible light. The orbital hybridization of the d orbit from the adsorbed metal atom and the p orbit from the O of the defect site increases the Schottky barrier of the electronic structure. Full article
(This article belongs to the Special Issue TiO2-based Nanostructures, Composites and Hybrid Photocatalysts)
Figures

Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Development of Titanium and Graphene Oxide (TiO2/GO) as Moisture Sensor

Diogo José Horst, Pedro Paulo de Andrade Junior, Charles Adriano Duvoisin, Rogério de Almeida Vieira

Federal University of Santa Catarina; Federal University of São Paulo

In this study we intend to verify the sensing capacity of titanium and graphene oxides (TiO2/GO) with variations in the experimental parameters applied. The TiO2 will be deposited in a graphene matrix via Chemical Vapor Deposition (CVD) in atmosphere of oxygen with argon thus generating a composite. The effect of the applied methodology and experimental parameters on the morphology, particle size, sample uniformity and (TiO2/GO) properties will be studied. All samples will be analyzed by X-ray Diffraction (XRD) for determination of the present phases, Scanning Electron Microscopy (SEM) to verify the microstructure and by Differential Scanning Calorimetry (DSC) to establish the temperature ranges at which the transitions of the phase, as well as to determine its dependence with the heating rate and also the specific temperature variation as a function of temperature for the studied materials. According to preliminary results obtained, rare earths will be chosen to dope the sensor in a new synthesis, seeking to optimize the sensor capacity by searching for applications of technological interest. The sensitivity of the material will be verified through a Wheatstone bridge in direct current or alternating current, through its resistive property, thus proving the use of this composite as humidity sensor.

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