Special Issue "New Trends in Photo(Electro)catalysis: From Wastewater Treatment to Energy Production"
Deadline for manuscript submissions: 31 May 2019
Prof. Dr. Simonetta Palmas
Dipartimento Ingn Meccan Chim & Mat, Univ Cagliari, Via Marengo 3, I-09123 Cagliari, Italy
Website | E-Mail
Interests: preparation and characterization of catalysts for redox processes; synthesis and characterization of semiconductor nanostructured materials; synthesis of TiO2 nanotubes; Advanced Oxidation Processes for the demolition of biorefractory organics and wastewater treatment; application of photoelectrocatalytic processes in the energetic and environmental field
Remediation of wastewater, up to a level acceptable for discharge into receiving waterbodies, involves an ever-growing demand of energy, so effective and low energy use demand treatment processes that are highly desirable
Among the others, photo and photo-electrochemical treatment processes may be considered as advanced oxidation processes (AOP), which are based on the generation of OH radicals, strong oxidizing agents able to indiscriminately degrade even the most persistent organic compounds.
Photocatalysis, which exploits the semiconductor material’s ability to generate electron-hole coupling, under the irradiation of a suitable wavelength, can be considered as an effective method for organic degradation, especially when the semiconductor is active in the range of visible light.
Greater efficiencies may be obtained in photo-electrocatalytic processes, thanks to the application of an electric field, which assists the displacement of electrons within the semiconductor structure, thus reducing the recombination between photo-generated charges, which represents one of the main drawbacks of this process.
This Special Issue aims to focus on new trends in photo-electrocatalysis, not only for aspects related to possible advances in materials science, but also to new possible applications of the technology. Actually, we may consider the different philosophies that have been prevailing in these last few years: rather than considering the wastewater treatment process as just a way to destroy or remove organics from waste, the pollutants may be considered as a source of energy, so that the electrons produced by the oxidative process could be recovered and possibly used to obtain new chemicals and fuels.
Thus, research on new morphologies and structures, which allow more photoactive, visible responsive, and stable materials will be welcome, as well as studies on combined processes in which photo- or photo-electrochemistry contributes to an increase in the sustainability of the whole process, in terms of lowering costs and achieving the most valuable final products.
Prof. Simonetta Palmas
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.
- Photoelectrocatalytic wastewater treatment
- Photoelectrocatalytic degradation of organics
- Nanostructured semiconductors
- Visible light sensitive semiconductors
- Wastewater sustainable combined processes
- Advanced electrochemical oxidation processes
- H2 production
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.
Title: Integrated Au/TiO2 nanostructured photoanodes for photoelectrochemical organics degradation
Authors: Roberto Matarrese1, Isabella Nova1, Andrea Li Bassi1, Laura Mais2 et al.
Affiliation: 1Department of Energy, Politecnico di Milano, Milano, Italy; 2Dipartimento di Ingegneria Meccanica Chimica e dei Materiali, Università di Cagliari, Italy
Short Abstract: Several nanostructured TiO2 networks (e.g. tubes, rods, wires, sponges) emerged as promising materials that can be used as photoanodes for photoelectrochemical applications. In particular, extensive research has been performed on TiO2 1D nanostructures such as nanotube arrays because their ordered geometry and tunable morphologies are claimed for fast charge separation and transport, and for electrolyte infiltration. More recently, quasi 1-D hierarchical structures prepared by reactive pulsed laser deposition (PLD) have been proposed as novel photonaodes. Besides, gold plasmonic nanoparticles (NPs) have recently attracted attention of the scientific community for the possibility to enhance light harvesting and quantum efficiency in photoconversion processes.
In this study, Pulsed Laser Deposition (PLD) technique was used to produce nanostructured TiO2 films integrated with Au NPs. A wide range of PLD process parameters were investigated to control the growth of both Au NPs and nanostructured TiO2 films. In particular, hierarchical TiO2/Au-NPs assemblies with NPs deposited at the bottom, at the top of the TiO2, as well as both on the bottom and on the top were prepared. The potential of the different Au/TiO2 nanostructures as photoanodes for the photoelectrochemical wastewater treatment was investigated. For this purpose the photoelectrochemical properties of the synthesized anode materials were characterized by using a three electrode cell in which model samples worked as working electrodes. Irradiation of the samples was made by means of both a Xe lamp, equipped with focusing lens and optical filters, and under standard solar spectrum. The reactivity towards both model molecules (e.g. ethylene glycol) and/or real organic substrates (e.g. lindane) was analyzed with classical electrochemical techniques such as steady-state polarization and cyclic voltammetry.
Title: Wastewater Treatment and Electricity Production in the Microbial Fuel Cell with the Cu-B Alloy as Cathode Catalyst
Authors: Paweł P. Włodarczyk 1,* and Barbara Włodarczyk 1
Affiliation: University of Opole, Institute of Technical Science, Faculty of Natural Sciences and Technology, Opole, Poland; [email protected], [email protected]
* Correspondence: [email protected]; Tel.: +48-077-401-6717
Abstract: The possibility to combine wastewater treatment and electricity production can accomplish a microbial fuel cell (MFC). The possibility of wastewater treatment and electricity production using the microbial fuel cell with the Cu-B alloy as cathode catalyst is presented in this paper. The research covered catalyst preparation, analysis of the decomposition rate of hydrogen peroxide on the Cu-B catalyst, the electricity production in a MFC (with Cu-B cathode) and comparison of changes in the concentration of COD, NH4+ and NO3– in the reactor without aeration, with aeration and with using a microbial fuel cell (with Cu-B cathode). During the measurements of electricity production equal 0,21-0,35 mA/cm2 was obtained. The reduction time for COD with the use of MFC with the Cu-B catalyst is similar to the reduction time with aeration. The measurement of NH4+ reduction shows almost no changes in cases measurement in MFC. The measurements have shown also the effectiveness (about 90%) of NO3– reduction. It has been shown that the Cu-B can be used as cathode catalyst in microbial fuel cells for wastewater treatment and electricity production.
Keywords: Cu-B catalyst; microbial fuel cell; cathode; environmental engineering; renewable energy sources: oxygen electrode