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Novel Aspects of Heterogeneous Photocatalytic Reaction

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

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 5670

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College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China
Interests: C–H activation; nucleophilic reactions; green synthesis; radical reactions
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Special Issue Information

Dear Colleague,

Photoredox catalysis has gained widespread attention due to its unique advantages of being energy saving, highly efficient, and simple to handle. However, most of the reported photocatalytic reactions are dominated by homogeneous photocatalysts, such as Ru(II)- or Ir(III)-based transition metal complexes or organic dyes, for example, Eosin Y, Rhodamine 6G, 4CzIPN, and acridinium salts, whose photo properties are highlighted in the literature. Although these homogenous photocatalysts show excellent photocatalytic activity in diverse reactions, they all encounter some common imperfections, including high economic and environmental cost, easy degradation/decomposition during reaction, and poor reusability after reaction, which limit their large-scale and long-term use in pharmaceutical production. To address these issues, the development of recyclable, heterogeneous, photocatalyzed transformation is an attractive and practical strategy. The main objective of this Special Issue is to highlight the recent advances in heterogeneous photoredox catalysis that have brought it to the forefront of research and development in synthetic organic chemistry, which will be critical for the broader understanding and dissemination of this research field. This includes innovative applications, new reaction methodologies, novel catalyst designs, and the fundamental physical aspects of photocatalysis.

Dr. Longyong Xie
Guest Editor

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Keywords

  • visible light
  • green chemistry
  • heterogeneous photocatalyst
  • recyclable
  • metal free

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Published Papers (3 papers)

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Research

14 pages, 4907 KiB  
Article
Enhancing the Photocatalytic Performance of Antibiotics Using a Z-Scheme Heterojunction of 0D ZnIn2S4 Quantum Dots and 3D Hierarchical Inverse Opal TiO2
by Li-Bang Zhu and Shou-Nian Ding
Molecules 2023, 28(20), 7174; https://doi.org/10.3390/molecules28207174 - 19 Oct 2023
Cited by 1 | Viewed by 1562
Abstract
Limited light absorption and rapid photo-generated carriers’ recombination pose significant challenges to the practical applications of photocatalysts. In this study, we employed an efficient approach by combining the slow-photon effect with Z-scheme charge transfer to enhance the photo-degradation performance of antibiotics. Specifically, we [...] Read more.
Limited light absorption and rapid photo-generated carriers’ recombination pose significant challenges to the practical applications of photocatalysts. In this study, we employed an efficient approach by combining the slow-photon effect with Z-scheme charge transfer to enhance the photo-degradation performance of antibiotics. Specifically, we incorporated 0D ZnIn2S4 quantum dots (QDs) into a 3D hierarchical inverse opal (IO) TiO2 structure through a facile one-step process. This combination enhanced the visible light absorption and provided abundant active surfaces for efficient photo-degradation. Moreover, the ZnIn2S4 QDs formed an artificial Z-scheme system with IO-TiO2, facilitating the separation and migration of charge carriers. To achieve a better band alignment with IO-TiO2, we doped Ag into the ZnIn2S4 QDs (Ag: ZIS QDs) to adjust their energy levels. Through an investigation of the different Ag contents in the ZnIn2S4 QDs, we found that the optimal photo-degradation performance was achieved with Ag (2.0): ZIS QDs/IO-TiO2, exhibiting degradation rates 19.5 and 14.8 times higher than those of ZnIn2S4 QDs and IO-TiO2, respectively. This study provides significant insights for elevating the photocatalytic capabilities of IO-TiO2 and broadening its prospective applications. Full article
(This article belongs to the Special Issue Novel Aspects of Heterogeneous Photocatalytic Reaction)
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14 pages, 16419 KiB  
Article
Synergistically Enhanced Photocatalytic Degradation by Coupling Slow-Photon Effect with Z-Scheme Charge Transfer in CdS QDs/IO-TiO2 Heterojunction
by Li-Bang Zhu, Ning Bao, Qing Zhang and Shou-Nian Ding
Molecules 2023, 28(14), 5437; https://doi.org/10.3390/molecules28145437 - 16 Jul 2023
Cited by 3 | Viewed by 1344
Abstract
Lower light absorption and faster carrier recombination are significant challenges in photocatalysis. This study introduces a novel approach to address these challenges by anchoring cadmium sulfide quantum dots (CdS QDs) on inverse opal (IO)-TiO2, which increases light absorption and promotes carriers’ [...] Read more.
Lower light absorption and faster carrier recombination are significant challenges in photocatalysis. This study introduces a novel approach to address these challenges by anchoring cadmium sulfide quantum dots (CdS QDs) on inverse opal (IO)-TiO2, which increases light absorption and promotes carriers’ separation by coupling slow-photon effect with Z-scheme charge transfer. Specifically, the IO-TiO2 was created by etching a polystyrene opal template, which resulted in a periodic structure that enhances light absorption by reflecting light in the stop band. The size of CdS quantum dots (QDs) was regulated to achieve appropriate alignment of energy bands between CdS QDs and IO-TiO2, promoting carrier transfer through alterations in charge transfer modes and resulting in synergistic-amplified photocatalysis. Theoretical simulations and electrochemical investigations demonstrated the coexistence of slow-photon effects and Z-scheme transfer. The system’s photodegradation performance was tested using rhodamine B as a model. This novel hierarchical structure of the Z-scheme heterojunction exhibits degradability 7.82 and 4.34 times greater than pristine CdS QDs and IO-TiO2, respectively. This study serves as a source of inspiration for enhancing the photocatalytic capabilities of IO-TiO2 and broadening its scope of potential applications. Full article
(This article belongs to the Special Issue Novel Aspects of Heterogeneous Photocatalytic Reaction)
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16 pages, 3600 KiB  
Article
External Catalyst- and Additive-Free Photo-Oxidation of Aromatic Alcohols to Carboxylic Acids or Ketones Using Air/O2
by Meng Xu, Jinhua Ou, Kejun Luo, Rongtao Liang, Jian Liu, Ni Li, Bonian Hu and Kaijian Liu
Molecules 2023, 28(7), 3031; https://doi.org/10.3390/molecules28073031 - 28 Mar 2023
Cited by 3 | Viewed by 2253
Abstract
We present an environment-friendly and highly efficient method for the oxidation of aromatic alcohols to carboxylic acids or ketones in air via light irradiation under external catalyst-, additive-, and base-free conditions. The photoreaction system exhibits a wide substrate scope and the potential for [...] Read more.
We present an environment-friendly and highly efficient method for the oxidation of aromatic alcohols to carboxylic acids or ketones in air via light irradiation under external catalyst-, additive-, and base-free conditions. The photoreaction system exhibits a wide substrate scope and the potential for large-scale applications. Most of the desired products are easily obtained via recrystallization and separation from low-boiling reaction medium acetone in good yields, and the products can be subsequent directly transformed without further purification. Full article
(This article belongs to the Special Issue Novel Aspects of Heterogeneous Photocatalytic Reaction)
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