Special Issue "Organic Photoredox Catalysis"

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

Deadline for manuscript submissions: closed (30 April 2018)

Special Issue Editor

Guest Editor
Prof. Dr. Axel G. Griesbeck

Department of Chemistry, University of Cologne, Greinstr. 4, D-50939 Koeln, Germany
Website | E-Mail
Interests: photooxygenation of organic compounds; photocycloaddition reactions; photodecarboxylation; photoisomerization; photoinduced electron transfer; photochemical macrocyclization reactions; new photochemical reactors and technologies

Special Issue Information

Dear Colleagues,

The modern repertoire of catalysis has been supplemented by photoredox catalysis in the last decade. For quite some time, metal-catalyzed redox chemistry is a well-established and intensively investigated field and also the principles of photocatalysis are well established. The new and rapidly growing field of photoredox catalysis brings together the favorable properties of both of these catalysis worlds. Photoexcitation of specially designed light-absorbing molecules can shift their catalytic activities to hitherto unknown capacities and open new reactivity and selectivity in catalysis. If operating in photoredox processes, these reactions can replace or complement numerous ground-state catalytic processes. Additionally, also classical photochemical processes can be converted into catalytic variants with favorable properties concerning the light-absorbing step (use of visible light, solar photochemistry, cheap lamp technology) and the chemical as well as quantum yields of these reactions. As a third area of improvement, completely new reactivity pattern can be expected by the combination of ground-state redox properties with additional activation achieved by photoexcitation. This Special Issue of Catalysts is devoted to all three areas of topical research.

 Submissions are welcome, especially in the following fields of research:

  • Applications of photoredox catalysis for CC bond formation
  • Applications of photoredox catalysis for C-heteroatom bond formation
  • Applications of photoredox catalysis for degradation processes
  • Applications of photoredox catalysis for the synthesis of heterocycles
  • Applications of photoredox catalysis for (photo)oxidation
  • Applications of photoredox catalysis for (photo)reduction
  • Enantioselective photoredox catalysis
  • Experimental tools for photoredox catalysis
  • Flow techniques in photoredox catalysis
  • Basic principles of photoredox catalysis
  • Electrochemical investigations
  • Spectroscopical and theoretical investigations

Prof. Dr. Axel Griesbeck
Guest Editor

Manuscript Submission Information

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Published Papers (2 papers)

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Research

Open AccessArticle Low Temperature Synthesis of Nest-Like Microsphere with Exposed (001) Facets and Its Enhanced Photocatalytic Performance by NaOH Alkalization
Catalysts 2018, 8(2), 70; https://doi.org/10.3390/catal8020070
Received: 31 December 2017 / Revised: 5 February 2018 / Accepted: 5 February 2018 / Published: 8 February 2018
Cited by 2 | PDF Full-text (3890 KB) | HTML Full-text | XML Full-text
Abstract
In this study, we completed a simple low-temperature synthesis of nest-like titanium oxide (TiO2) microspheres with exposed (001) facets. For the first time, the photocatalytic performance was enhanced by sodium hydroxide (NaOH) alkalization. The characterization of as-synthesized F-TiO2 and OH-TiO
[...] Read more.
In this study, we completed a simple low-temperature synthesis of nest-like titanium oxide (TiO2) microspheres with exposed (001) facets. For the first time, the photocatalytic performance was enhanced by sodium hydroxide (NaOH) alkalization. The characterization of as-synthesized F-TiO2 and OH-TiO2 were analyzed by field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, fourier transform infrared spectroscopic analysis, ultraviolet-vis diffuse reflection spectra and Raman spectroscopy. The photocatalytic activity of the as-prepared catalyst was evaluated through the photocatalytic degradation of methylene blue (MB) and Rhodamine B (RhB) under simulated solar light. The results showed that modification using NaOH can lead to an increase in the percentage of (001) facets from 27.8% for F-TiO2 to 39.2% for OH-TiO2. OH-TiO2 showed superior catalytic photoactivity toward MB. The mechanism of NaOH on TiO2 is also discussed. Full article
(This article belongs to the Special Issue Organic Photoredox Catalysis)
Figures

Graphical abstract

Open AccessArticle Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation
Catalysts 2018, 8(2), 45; https://doi.org/10.3390/catal8020045
Received: 3 December 2017 / Revised: 17 January 2018 / Accepted: 23 January 2018 / Published: 25 January 2018
Cited by 1 | PDF Full-text (9012 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A new visible-light-driven heterojunction Ag3PO4/g-C3N4 was prepared by a simple deposition-precipitation method for the degradation analysis of diclofenac (DCF), a model drug component, under visible-light irradiation. The heterojunction photocatalysts were characterized by a suite of tools.
[...] Read more.
A new visible-light-driven heterojunction Ag3PO4/g-C3N4 was prepared by a simple deposition-precipitation method for the degradation analysis of diclofenac (DCF), a model drug component, under visible-light irradiation. The heterojunction photocatalysts were characterized by a suite of tools. The results revealed that the introduction of Ag3PO4 on the surface of g-C3N4 greatly promoted its stability and light absorption performance. In addition, the effects of the heterojunction mixing ratios were studied, when the molar ratio of Ag3PO4 to g-C3N4 in the composite was 30%, the as-prepared photocatalyst Ag3PO4/g-C3N4 (30%) possessed the best photocatalytic activity toward the photodegradation of DCF, and the optimal photocatalyst showed a DCF degradation rate of 0.453 min−1, which was almost 34.8 and 6.4 times higher than those of pure g-C3N4 (0.013 min−1) and Ag3PO4 (0.071 min−1) under visible light irradiation (λ ≥ 400 nm). The trapping experimental results showed that h+, ·OH, and ·O2 were the main reactive oxygen species during the photocatalytic reaction. The improved performance of the composites was induced by the high charge separation efficiency of the photogeneration electron-hole pairs as well as the surface plasmon resonance (SPR) endowed in the Ag0 nanoparticles, and ultimately enhanced the DCF photodegradation. Full article
(This article belongs to the Special Issue Organic Photoredox Catalysis)
Figures

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