Special Issue "Photocatalysis Science and Engineering in Europe"

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

Deadline for manuscript submissions: 31 July 2019

Special Issue Editors

Guest Editor
Prof. Dr. Dionissios Mantzavinos

Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece
Website | E-Mail
Interests: advanced oxidation processes; applied catalysis; environmental chemical engineering; wastewater engineering
Guest Editor
Dr. Danae Venieri

School of Environmental Engineering, Technical University of Crete, GR-73100 Chania, Greece
Website | E-Mail
Interests: Monitoring of aquatic environment in terms of evaluation of microbiological quality and microbial response during disinfection processes and against pollutants. Assessment of microbiological quality of the environment (drinking water, seawater, wastewater, food) and the study of environmental microorganisms (bacteria, parasites, bacteriophages, enteric viruses) with various techniques (culture and molecular)

Special Issue Information

Dear Colleagues,

This Special Issue welcomes both review and original research articles on all aspects of heterogeneous and homogeneous photocatalysis with an emphasis on fundamental and applied research implemented across Europe. Topics include, but are not limited to, the following:

  • Water/wastewater treatment and disinfection;
  • Air treatment;
  • Green synthesis by solar photochemistry and photocatalysis;
  • New materials for photochemistry and photocatalysis;
  • Developments and perspectives in environmental photochemistry;
  • Large scale and commercial applications;
  • Experimental standardization;
  • Models for photochemistry and photocatalysis;
  • Process funtamentals;
  • Process economics and LCA;
  • Photocatalytic hybrid systems;
  • Photocatalytic, photochemical and photosynthetic systems for H2 production and CO2 utilization.

Although papers should report on trends and advances in the field of photocatalysis across Europe; collaborative work between European and non-European partners is also welcome.

Prof. Dr. Dionissios Mantzavinos
Dr. Danae Venieri
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 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. 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 1600 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 photocatalysis
  • Solar photocatalysis
  • Visible responsive semiconductors
  • Photo-Fenton and alike reactions
  • Pathogens (bacteria, viruses, parasites)
  • Antibiotic resistant bacteria
  • Antibiotic resistance genes
  • Emerging micro-contaminants
  • Energy
  • Pollution abatement
  • Water matrix
  • Photochemical AOPs
  • Process coupling and synergy

Published Papers (6 papers)

View options order results:
result details:
Displaying articles 1-6
Export citation of selected articles as:

Research

Jump to: Review

Open AccessArticle Pure, Size Tunable ZnO Nanocrystals Assembled into Large Area PMMA Layer as Efficient Catalyst
Catalysts 2019, 9(2), 162; https://doi.org/10.3390/catal9020162
Received: 24 January 2019 / Revised: 1 February 2019 / Accepted: 1 February 2019 / Published: 7 February 2019
Cited by 1 | PDF Full-text (7723 KB) | HTML Full-text | XML Full-text
Abstract
Here, we demonstrate for the first time a strategy to self-assemble ZnO nanoparticles (NP) on a large area by a facile one-step process. First, rough and random ZnO nanocrystals (NC), were produced by free-stabilizing aqueous synthesis. Therefore, a post thermal treatment at various [...] Read more.
Here, we demonstrate for the first time a strategy to self-assemble ZnO nanoparticles (NP) on a large area by a facile one-step process. First, rough and random ZnO nanocrystals (NC), were produced by free-stabilizing aqueous synthesis. Therefore, a post thermal treatment at various temperatures ranging from 80 to 800 °C was necessary to obtain size-tunable and photoluminescent crystalline NP. The fabricated NP had both efficient UV photoluminescence and photocatalytic activity by photo-degradation of Methylene Blue (MB) dye. The annealed NP showed an absorption blue shift in the UV region with decreasing size. This shift was attributed to high quantum confinement effect since ZnO NP diameter reached values lower than the Bohr radius of ZnO (~2.7 nm). The photocatalytic activity displayed dependency on the particle’s size, number, and crystallinity. Subsequently, the NP were self-assembled inside poly(methyl methacrylate) (PMMA) nanoholes. Subsequently, large area substrate of homogenous properties ZnO NP was obtained. Moreover, the synthesis facility, photoemission and photocatalytic properties of ZnO NP could be a new insight into the realization of high performance and low cost UV laser devices. Full article
(This article belongs to the Special Issue Photocatalysis Science and Engineering in Europe)
Figures

Figure 1

Open AccessFeature PaperArticle CdS Photocatalysts Modified with Ag: Effect of the Solvothermal Temperature on the Structure and Photoactivity for Hydrogen Production
Catalysts 2019, 9(2), 110; https://doi.org/10.3390/catal9020110
Received: 14 December 2018 / Revised: 14 January 2019 / Accepted: 15 January 2019 / Published: 22 January 2019
PDF Full-text (6419 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
This work studies the effect of the temperature in the solvothermal synthesis of CdS modified with Ag (Ag-CdS) over both the structure of CdS and the chemical state of the Ag species. The increase in the solvothermal temperature produces the evolution of the [...] Read more.
This work studies the effect of the temperature in the solvothermal synthesis of CdS modified with Ag (Ag-CdS) over both the structure of CdS and the chemical state of the Ag species. The increase in the solvothermal temperature produces the evolution of the CdS nanostructures from nanoparticles of low crystallinity in coexistence with small nanocrystals with strong confinement effect to the formation of highly crystalline nanorods. The Ag species also change with the solvothermal temperature from Ag2S species, formed at low temperature, to metallic species as the temperature increases. The photoactivity of the Ag-CdS samples is the result of the combination of three factors: crystallinity of the CdS structures, existence of small nanocrystals with strong confinement effect and the presence of segregated Ag2S species. The Ag-CdS sample prepared at 120 °C shows the better efficiency for hydrogen production because it achieves the better combination of the aforementioned factors. Full article
(This article belongs to the Special Issue Photocatalysis Science and Engineering in Europe)
Figures

Graphical abstract

Open AccessArticle Synthesis, Characterization of g-C3N4/SrTiO3 Heterojunctions and Photocatalytic Activity for Organic Pollutants Degradation
Catalysts 2018, 8(11), 554; https://doi.org/10.3390/catal8110554
Received: 9 October 2018 / Revised: 13 November 2018 / Accepted: 14 November 2018 / Published: 17 November 2018
PDF Full-text (4022 KB) | HTML Full-text | XML Full-text
Abstract
Perovskite-structure SrTiO3 (STO) and graphitic carbon nitride (g-C3N4, CN) have attracted considerable attention in photocatalytic technology due to their unique properties, but also suffer from some drawbacks. The development of composite photocatalysts that combine properties of the individual [...] Read more.
Perovskite-structure SrTiO3 (STO) and graphitic carbon nitride (g-C3N4, CN) have attracted considerable attention in photocatalytic technology due to their unique properties, but also suffer from some drawbacks. The development of composite photocatalysts that combine properties of the individual semiconductors with enhanced charge separation is the current major trend in the photocatalysis field. In this study, SrTiO3/g-C3N4 (CNSTO) composites with different ratios (10, 20, 30, 40 and 50% g-C3N4) were prepared with a sonication mixing method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 porosimetry, Fourrier transform infra-red spectroscopy (FT-IR), UV-Vis diffuse reflectance (DRS) and dynamic light scattering (DLS). STO spherical particles were successfully loaded on the g-C3N4 planes forming heterojunction composite materials. The photocatalytic activity was tested against the degradation of methylene blue (MB) dye under simulated solar light (SSL) irradiation following first-order kinetics. The photocatalytic activity followed the trend: 20CNSTO > 30CNSTO > 40CNSTO > 50CNSTO ≈ 10CNSTO, in accordance with the amount of OH radicals determined by fluorescence spectroscopy. A Z-scheme mechanism was proposed for the enhanced photocatalytic degradation of MB as evidenced by trapping experiments with scavengers. Finally, significant stability and reusability was exhibited, indicating that such composites are of potential interest for photocatalytic treatments under sunlight irradiation. Full article
(This article belongs to the Special Issue Photocatalysis Science and Engineering in Europe)
Figures

Graphical abstract

Open AccessFeature PaperArticle Development of SrTiO3 Photocatalysts with Visible Light Response Using Amino Acids as Dopant Sources for the Degradation of Organic Pollutants in Aqueous Systems
Catalysts 2018, 8(11), 528; https://doi.org/10.3390/catal8110528
Received: 16 October 2018 / Revised: 30 October 2018 / Accepted: 2 November 2018 / Published: 8 November 2018
Cited by 2 | PDF Full-text (4353 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
N-doped and N,S-co-doped SrTiO3 photocatalysts were prepared using glycine and L-histidine amino acids as nitrogen sources and L-cysteine as nitrogen and sulphur source. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 porosimetry, UV-Vis diffuse reflectance (DRS) [...] Read more.
N-doped and N,S-co-doped SrTiO3 photocatalysts were prepared using glycine and L-histidine amino acids as nitrogen sources and L-cysteine as nitrogen and sulphur source. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 porosimetry, UV-Vis diffuse reflectance (DRS) and fluorescence spectroscopy, dynamic light scattering (DLS). Cubic SrTiO3 phase is formed in all samples, with crystal size ranged from 14.2 nm to 35.7 nm. The catalysts’ specific surface area and porosity depend on the amino acid dopant showing micro-mesoporosity for glycine, mesoporosity for histidine and non-porosity for cysteine. The lowest band gap (2.95 eV) was observed for the sample G-N-STO3 prepared with glycine (N:Sr:Ti 3:1:1 molar ratio) which produced also the higher amount of OH radicals. The photocatalytic activity was tested against the degradation of methylene blue (MB) dye under UV-Vis and visible light irradiation following first-order kinetics. Full article
(This article belongs to the Special Issue Photocatalysis Science and Engineering in Europe)
Figures

Graphical abstract

Open AccessArticle Effect of H2O and O2 on the Adsorption and Degradation of Acetaldehyde on Anatase Surfaces—An In Situ ATR-FTIR Study
Catalysts 2018, 8(10), 417; https://doi.org/10.3390/catal8100417
Received: 10 September 2018 / Revised: 21 September 2018 / Accepted: 21 September 2018 / Published: 25 September 2018
Cited by 1 | PDF Full-text (3335 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The effect of H2O and O2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the surface have [...] Read more.
The effect of H2O and O2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the surface have been elucidated by means of in situ ATR–FTIR (Attenuated Total Reflection—Fourier Transform Infrared) spectroscopy, while gas detectors allowed the analysis of the adducts and products in the gas phase. In the dark and under dry conditions acetaldehyde reacts independently of the atmosphere, upon aldol condensation to crotonaldehyde. However, under humid conditions, this reaction was prevented due to the replacement of the adsorbed acetaldehyde molecules, by water molecules. Upon UV illumination under oxygenic conditions, acetaldehyde was decomposed to acetate and formate. Under an N2 atmosphere, the formation of acetate and formate was observed during the first hour of illumination, until all adsorbed oxygen had been consumed. In the absence of molecular oxygen acetate, methane, and CO2 were detected, the formation of which most likely involved the participation of the bridging O atoms, within the TiO2 lattice. Full article
(This article belongs to the Special Issue Photocatalysis Science and Engineering in Europe)
Figures

Graphical abstract

Review

Jump to: Research

Open AccessReview Recent Development of Photocatalysts Containing Carbon Species: A Review
Catalysts 2019, 9(1), 20; https://doi.org/10.3390/catal9010020
Received: 3 December 2018 / Revised: 21 December 2018 / Accepted: 24 December 2018 / Published: 28 December 2018
PDF Full-text (7245 KB) | HTML Full-text | XML Full-text
Abstract
Undoubtedly, carbon-based (nano)composites can be promising photocatalysts with improved photocatalytic activity due to the coupling effect from the incorporation of carbon species. In this mini-review, we focus on the recent development of photocatalysts based on carbon-based (nano)composites. TiO2 is well-known as a [...] Read more.
Undoubtedly, carbon-based (nano)composites can be promising photocatalysts with improved photocatalytic activity due to the coupling effect from the incorporation of carbon species. In this mini-review, we focus on the recent development of photocatalysts based on carbon-based (nano)composites. TiO2 is well-known as a typical photocatalyst. Special attention is paid to the various types of carbon–TiO2 composites such as C-doped TiO2, N–C-doped TiO2, metal–C-doped TiO2, and other co-doped C/TiO2 composites. Various synthetic strategies including the solvothermal/hydrothermal method, sol–gel method, and template-directed method are reviewed for the preparation of carbon-based TiO2 composites. C/graphitic carbon nitride (g-C3N4) composites and ternary C-doped composites are also summarized and ascribed to the unique electronic structure of g-C3N4 and the synergistic effect of the ternary interfaces, respectively. In the end, we put forward the future perspective of the photocatalysts containing carbon species based on our knowledge. Full article
(This article belongs to the Special Issue Photocatalysis Science and Engineering in Europe)
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.

Tentative Title: Removal of organic micropollutants from a municipal wastewater secondary effluent by UVA-LED photocatalytic ozonation

Authors: Ana M. Chávez1, Ana R. Ribeiro2, Nuno F.F. Moreira2, Adrián M.T. Silva2, Ana Rey1, Pedro M. Álvarez1, Fernando J. Beltrán1*
Affiliations: 1Departamento de Ingeniería Química y Química Física, Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad, Universidad de Extremadura, Avenida de Elvas s/n, 06006 Badajoz, Spain.
2Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal.
Tentative abstract: Twelve contaminants of emerging concern (CECs), one herbicide (isoproturon) and eleven pharmaceutical compounds, were detected in samples of a municipal wastewater secondary effluent (WW) by means of solid phase extraction (SPE) and ultra-high performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS). Different advanced oxidation processes (AOPs), based on the combination of ozone, UVA-LED and powdered TiO2, were investigated for their removal in semi-batch operation. In addition, TiO2 was immobilized on glass rings (P25R), characterized with different techniques (SEM, WDXRF, etc) and the experiments performed in a packed bed reactor (PBR) for continuous mode operation. Among the AOPs studied, photocatalytic ozonation (O3/LED/P25R) was found as an efficient process for the contaminants removal. On the other hand, a kinetic study was performed showing that direct ozonation is the main oxidation pathway for the removal of CECs. Nevertheless, ozone could be successfully decomposed in combination with UVA-LED and P25R, giving as a result an apparent rate constant of 3.2·10-2 s-1 higher  than  in the O3/LED  system (10-3 s-1) or with ozone alone (8.6·10-5 s-1). Thus, hydroxyl radical reaction could prevail over direct ozone reaction for the most refractory compounds (i.e. isoproturon).

Catalysts EISSN 2073-4344 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top