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Special Issue "Solar Photocatalysis"

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

Deadline for manuscript submissions: closed (31 December 2016)

Special Issue Editor

Guest Editor
Prof. Dr. Michael K. H. Leung

School of Energy and Environment, Ability RandD Energy Research Centre, City University of Hong Kong, Hong Kong, China
Website | E-Mail
Interests: solar photocatalysis; fuel-cell electrochemistry; hydrogen production; carbon management; carbon capture and storage; advanced refrigeration and air-conditioning

Special Issue Information

Dear Colleagues,

To increase our sustainability, we need to actively change our primary energy source from finite fossil fuel to renewable energy resources. Solar energy is certainly the largest source of renewable energy on Earth; besides, conversion of solar energy into useful forms by solar thermal and photovoltaic technologies, solar energy can be directly utilized for functional applications by means of solar photocatalysis. This Special Issue is intended to report the recent technological development in solar photocatalysis and its significant contribution.

Prof. Dr. Michael K. H. Leung
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. 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 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

  • Heterogeneous photocatalysis
  • Modified nanostructure photocatalyst
  • Photocatalytic reactor
  • Visible-light activation
  • Solar energy conversion
  • Air/water purification
  • Self-cleaning exterior surface

Published Papers (2 papers)

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Research

Open AccessArticle A Photocatalytic Rotating Disc Reactor with TiO2 Nanowire Arrays Deposited for Industrial Wastewater Treatment
Molecules 2017, 22(2), 337; https://doi.org/10.3390/molecules22020337
Received: 12 December 2016 / Revised: 6 February 2017 / Accepted: 14 February 2017 / Published: 22 February 2017
Cited by 2 | PDF Full-text (16869 KB) | HTML Full-text | XML Full-text
Abstract
A photocatalytic rotating disc reactor (PRD-reactor) with TiO2 nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes [...] Read more.
A photocatalytic rotating disc reactor (PRD-reactor) with TiO2 nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes (AOP), including photocatalytic oxidation and photolytic reaction, occurred during the processing. Efficiency of the AOP increases with reduction in light absorption pathlength, which enhanced the photocatalytic reaction, as well as by increasing oxygen exposure of the wastewater thin film due to the rotating disc design. It is found that, with a small dosage of hydrogen peroxide, the mineralization efficiency of industrial biodegraded wastewater can be enhanced, with a superior mineralization of >75% total organic carbon (TOC) removal. This is due to the fact that the TiO2 photocatalysis and hydrogen peroxide processes generate powerful oxidants (hydroxyl radicals) that can strongly improve photocatalytic oxidation efficiency. Application of this industrial wastewater treatment system is benefited from the TiO2 nanowire arrays, which can be fabricated by a mild solvothermal method at 80 °C and under atmospheric pressure. Similar morphologies and microstructures are found for the TiO2 nanowire arrays deposited on a large metal Ti disc, which makes the wastewater treatment process more practical and economical. Full article
(This article belongs to the Special Issue Solar Photocatalysis)
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Open AccessArticle Surface Modification of a Nanoporous Carbon Photoanode upon Irradiation
Molecules 2016, 21(11), 1611; https://doi.org/10.3390/molecules21111611
Received: 30 August 2016 / Revised: 4 November 2016 / Accepted: 15 November 2016 / Published: 23 November 2016
Cited by 3 | PDF Full-text (788 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The photocorrosion of a nanoporous carbon photoanode, with low surface functionalization and high performance towards the photoelectrochemical oxidation of water using simulated solar light, was investigated. Two different light configurations were used to isolate the effect of the irradiation wavelength (UV and visible [...] Read more.
The photocorrosion of a nanoporous carbon photoanode, with low surface functionalization and high performance towards the photoelectrochemical oxidation of water using simulated solar light, was investigated. Two different light configurations were used to isolate the effect of the irradiation wavelength (UV and visible light) on the textural and chemical features of the carbon photoanode, and its long-term photocatalytic performance for the oxygen evolution reaction. A complete characterization of the carbon showed that the photocorrosion of carbon anodes of low functionalization follows a different pathway than highly functionalized carbons. The carbon matrix gets slightly oxidized, with the formation of carboxylic and carbonyl-like moieties in the surface of the carbon anode after light exposure. The oxidation of the carbon occurred due to the photogeneration of oxygen reactive species upon the decomposition of water during the irradiation of the photoanodes. Furthermore, the photoinduced surface reactions depend on the nature of the carbon anode and its ability to photogenerate reactive species in solution, rather than on the wavelength of the irradiation source. This surface modification is responsible for the decreased efficiency of the carbon photoanode throughout long illumination periods, due to the effect of the oxidation of the carbon matrix on the charge transfer. In this work, we have corroborated that, in the case of a low functionalization carbon material, the photocorrosion also occurs although it proceeds through a different pathway. The carbon anode gets gradually slightly oxidized due to the photogeneration of O-reactive species, being the incorporation of the O-groups responsible for the decreased performance of the anode upon long-term irradiation due to the effect of the oxidation of the carbon matrix on the electron transfer. Full article
(This article belongs to the Special Issue Solar Photocatalysis)
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