Special Issue "Heterogeneous Photocatalysis and Photocatalytic Nanomaterials"

A special issue of ChemEngineering (ISSN 2305-7084).

Deadline for manuscript submissions: 15 November 2018

Special Issue Editors

Guest Editor
Dr. Mario J. Muñoz-Batista

Departamento de Química Orgánica, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie (C-3), Ctra Nnal IV, Km 396, E-14014, Córdoba, Spain
Website | E-Mail
Interests: heterogeneous catalysis; nanomaterials materials characterization; kinetic and mathematical modelling of photo-reactors
Guest Editor
Prof. Dr. Rafael Luque

Department of Quimica Organica, University of Cordoba, Cordoba, Spain
Website | E-Mail
Phone: +34957211050
Interests: Biomass/Waste Valorisation, Nanoscale Chemistry, Heterogeneous Catalysts

Special Issue Information

Dear Colleagues,

Heterogeneous photocatalysis is an advanced oxidation process that uses semiconductors in the degradation and transformation of organic pollutants, production of hydrogen using bio-molecules, conversion of CO2 into high value-added industrial chemicals and hydrocarbon fuels as well as degradation of biological microorganisms, among other applications. The photocatalytic process is largely defined by the properties of the catalyst. In this regard, an exceptional window of opportunity has been opened by using of nanomaterials. Single-phase TiO2 or TiO2-base systems, doped and composite materials, other oxides semiconductors (SnO2, ZnO, ZrO2, Bi2O3, Fe2O3, Fe3O4, WO3, CeO2, Cu2O), metal–organic frameworks, graphite-like carbon nitride and other nonoxidic photocatalyts, among others, are materials potentially efficient for a wide range of photocatalytic applications.

Based on these ideas, we would like to invite authors to present papers and short reviews in a broad range of photocatalysis and photocatalytic nanomaterials topics for this Special Issue. Studies could range from the nanomaterials synthesis and activity photocatalytic studies, photo-reaction kinetics and mechanism analysis, selectivity and stability analysis, light-matter interaction and photocatalytic modelling.

Dr. Mario J. Muñoz-Batista
Prof. Dr. Rafael Luque
Guest Editors

Manuscript Submission Information

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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. ChemEngineering is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) is waived for well-prepared manuscripts submitted to this issue. 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

  • photocatalysis
  • nanomaterials
  • photocatalytic applications
  • UV-Visible-IR-Sunlight (sunlight-type) irradiation
  • photocatalytic modelling
  • quantum efficiency and yield

Published Papers (4 papers)

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Research

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Open AccessArticle Photodegradation of Stearic Acid Adsorbed on Copper Oxide Heterojunction Thin Films Prepared by Magnetron Sputtering
ChemEngineering 2018, 2(3), 40; https://doi.org/10.3390/chemengineering2030040
Received: 11 August 2018 / Revised: 23 August 2018 / Accepted: 24 August 2018 / Published: 28 August 2018
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Abstract
Nanocrystalline copper oxide thin films were fabricated by reactive DC magnetron sputtering. The structure and optical properties of the films were measured with X-ray diffraction, scanning electron microscopy, and spectrophotometry. Variations of oxygen partial pressure resulted in oxide composition ranging from Cu, Cu-Cu
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Nanocrystalline copper oxide thin films were fabricated by reactive DC magnetron sputtering. The structure and optical properties of the films were measured with X-ray diffraction, scanning electron microscopy, and spectrophotometry. Variations of oxygen partial pressure resulted in oxide composition ranging from Cu, Cu-Cu2O, Cu2O-CuO1−x, and CuO. Optical band transitions at 2.06 eV and 2.55 eV were found for Cu2O corresponding to the direct forbidden and direct allowed interband transitions. For CuO an indirect allowed interband transition was found at 1.28 eV. The photocatalytic activity was determined by quantifying the rate constant and quantum yield (destroyed molecules/photons absorbed) under stearic acid degradation. Photocatalytic activity was found to be highest in mixed-phase films with Cu-Cu2O films the highest. Results from post-annealed Cu-Cu2O and CuO films show similar results. We interpret our results as being due to efficient electron-hole charge separation in the heterojunction films. The obtained quantum yields were generally about ten times lower than for comparable dense TiO2 and WO3 binary oxides, which calls for further studies of the spectral dependence of the quantum yield and electron-hole pair life times for oxides with different purity levels. Full article
(This article belongs to the Special Issue Heterogeneous Photocatalysis and Photocatalytic Nanomaterials)
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Open AccessArticle Natural Hematite and Siderite as Heterogeneous Catalysts for an Effective Degradation of 4-Chlorophenol via Photo-Fenton Process
ChemEngineering 2018, 2(3), 29; https://doi.org/10.3390/chemengineering2030029
Received: 18 May 2018 / Revised: 9 June 2018 / Accepted: 9 June 2018 / Published: 21 June 2018
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Abstract
This paper describes a simple and low-cost process for the degradation of 4-Chlorophenol (4-CP) from aqueous solution, using natural Tunisian Hematite (M1) and Siderite (M2). Two natural samples were collected in the outcroppings of the Djerissa mining site (Kef
[...] Read more.
This paper describes a simple and low-cost process for the degradation of 4-Chlorophenol (4-CP) from aqueous solution, using natural Tunisian Hematite (M1) and Siderite (M2). Two natural samples were collected in the outcroppings of the Djerissa mining site (Kef district, northwestern Tunisia). Both Hematite and Siderite ferrous samples were characterized using several techniques, including X-Ray Diffraction (XRD), Nitrogen Physisorption (BET), Infrared Spectroscopy (FTIR), H2-Temperature Programmed Reduction (H2-TPR), Scanning Electronic Microscopy (SEM) linked with Energy Dispersive X-ray (EDS) and High-Resolution Transmission Electron Microscopy (HRTEM). Textural, structural and chemical characterization confirmed the presence of Hematite and Siderite phases with a high amount of iron on the both surface materials. Their activity was evaluated in the oxidation of 4-CP in aqueous medium under heterogeneous photo-Fenton process. Siderite exhibited higher photocatalytic oxidation activity than Hematite at pH 3. The experimental results also showed that 100% conversion of 4-CP and 54% TOC removal can be achieved using Siderite as catalyst. Negligible metal leaching and catalyst reutilization without any loss of activity point towards an excellent catalytic stability for both natural catalysts. Full article
(This article belongs to the Special Issue Heterogeneous Photocatalysis and Photocatalytic Nanomaterials)
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Open AccessArticle Photodegradation of 1,2,4-Trichlorobenzene on Montmorillonite–TiO2 Nanocomposites
ChemEngineering 2018, 2(2), 22; https://doi.org/10.3390/chemengineering2020022
Received: 17 April 2018 / Revised: 11 May 2018 / Accepted: 15 May 2018 / Published: 17 May 2018
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Abstract
Montmorillonite–TiO2 nanocomposites were prepared using two different methods (ultrasonic or stirring) and using titanium(IV) isopropoxide as precursor. The solids were characterized by element chemical analysis, X-ray diffraction, FTIR spectroscopy, thermal analyses, and nitrogen adsorption. The evolution of the properties as a function
[...] Read more.
Montmorillonite–TiO2 nanocomposites were prepared using two different methods (ultrasonic or stirring) and using titanium(IV) isopropoxide as precursor. The solids were characterized by element chemical analysis, X-ray diffraction, FTIR spectroscopy, thermal analyses, and nitrogen adsorption. The evolution of the properties as a function of the preparation method was discussed. These nanocomposites were used as catalysts for the photodegradation of 1,2,4-trichlorobenzene. The degradation pathway and the nature of the by–products were investigated by mass spectrometry. Full article
(This article belongs to the Special Issue Heterogeneous Photocatalysis and Photocatalytic Nanomaterials)
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Review

Jump to: Research

Open AccessReview Solar Fuels by Heterogeneous Photocatalysis: From Understanding Chemical Bases to Process Development
ChemEngineering 2018, 2(3), 42; https://doi.org/10.3390/chemengineering2030042
Received: 30 July 2018 / Revised: 27 August 2018 / Accepted: 30 August 2018 / Published: 4 September 2018
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Abstract
The development of sustainable yet efficient technologies to store solar light into high energy molecules, such as hydrocarbons and hydrogen, is a pivotal challenge in 21st century society. In the field of photocatalysis, a wide variety of chemical routes can be pursued to
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The development of sustainable yet efficient technologies to store solar light into high energy molecules, such as hydrocarbons and hydrogen, is a pivotal challenge in 21st century society. In the field of photocatalysis, a wide variety of chemical routes can be pursued to obtain solar fuels but the two most promising are carbon dioxide photoreduction and photoreforming of biomass-derived substrates. Despite their great potentialities, these technologies still need to be improved to represent a reliable alternative to traditional fuels, in terms of both catalyst design and photoreactor engineering. This review highlights the chemical fundamentals of different photocatalytic reactions for solar fuels production and provides a mechanistic insight on proposed reaction pathways. Also, possible cutting-edge strategies to obtain solar fuels are reported, focusing on how the chemical bases of the investigated reaction affect experimental choices. Full article
(This article belongs to the Special Issue Heterogeneous Photocatalysis and Photocatalytic Nanomaterials)
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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: Novel Bicatalysts and Quantum Dot Photocatalysts for Environmental Remediation

Author: Lars Österlund

Affliation: Department of Engineering Sciences, Solid State Physics, Uppsala University, Swden

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