Application of Photocatalysts in Air Pollution

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

Deadline for manuscript submissions: 15 June 2024 | Viewed by 2593

Special Issue Editors


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Guest Editor
Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
Interests: advanced oxidation technologies; photothermocatalytic oxidation and reduction; air pollutants sampling and analysis; marine aerosols; atmospheric speciated mercury
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Guest Editor
Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 82445, Taiwan
Interests: photocatalysis; advanced oxidation processes; pollution control technology; clean technology; pollutant transport phenomena
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
Interests: photocatalytic technology; photoelectrical catalysts; simultaneous Hgo and NO removal; VOCs degradation

Special Issue Information

Dear Colleagues,

Photocatalysis technology has emerged as a promising solution for addressing various air pollutants, ranging from CO2 conversion and NOx oxidation to VOCs degradation and indoor air pollutant removal. By harnessing the power of photocatalysts such as TiO2, MnO2, and conjugated polymers, photon energy is absorbed and transformed into valuable chemical energy. Extensive research has been conducted to enhance the photon utility of photocatalysis through techniques such as modifying physical and chemical properties, heteroatom doping, creating heterojunctions, and optimizing reactor designs. Alongside treatment efficiencies, factors such as photocatalyst lifespan, tolerance to toxic components, and the selectivity of desired products are pivotal in evaluating the overall quality of photocatalysts. In particular, minimizing by-products, especially aromatic compounds, during VOCs degradation is of utmost importance.

The Special Issue aims to cover the in-depth exploration of recent progress and advancements in the field of photocatalysis. The scope of the Special Issue encompasses, but is not limited to, the preparation and characterization of innovative materials, the application of photocatalysis in tackling air pollutants, and the theoretical study of reaction mechanisms and kinetics.

If you would like to submit papers to this Special Issue or have any questions, please contact the editor, Mr. Ives Liu ([email protected]).

Prof. Dr. Chung-Shin Yuan
Prof. Dr. Chung-Hsuang Hung
Dr. Huazhen Shen
Guest Editors

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Keywords

  • photocatalysis application
  • innovative photocatalysts
  • reaction mechanisms and kinetics
  • air pollution control technologies
  • preparation and characterization of photocatalysts

Published Papers (3 papers)

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Research

16 pages, 4812 KiB  
Article
Investigation into the Exciton Binding Energy of Carbon Nitrides on Band Structure and Carrier Concentration through the Photoluminescence Effect
by Zhiyou Lin, Xu Cai and Wei Lin
Catalysts 2024, 14(4), 262; https://doi.org/10.3390/catal14040262 - 15 Apr 2024
Viewed by 245
Abstract
Carbon nitrides form a series of polymer semiconductors popular in photocatalysis. In the course of photoresponse, the separation of light-induced electron–hole pairs is one of the critical factors that affect the conversion rate from photoenergy to chemical substance. Exciton binding energy ( [...] Read more.
Carbon nitrides form a series of polymer semiconductors popular in photocatalysis. In the course of photoresponse, the separation of light-induced electron–hole pairs is one of the critical factors that affect the conversion rate from photoenergy to chemical substance. Exciton binding energy (Eb) is treated as a classical parameter to evaluate the barrier of exciton dissociation. In this work, we study the electronic and optical nature of two specific members of the carbon nitride family, polymeric carbon nitride (melon) and crystallized poly(triazine imide) (PTI/Li+Cl) by employing the photoluminescence spectra and density functional theory (DFT) calculations based on the Wannier-Mott exciton module. The results of self-consistent GW computation were applied. The measurement of photoluminescence spectra, by which exciton binding energies are estimated, is likewise discussed. Generally, compared with the results calculated by GW-BSE, the DFT results based on the Wannier-Mott model are closer to the experimental values. From a materials perspective, on the other hand, the exciton binding energy of the melon is lower than that of PTI/Li+Cl. Full article
(This article belongs to the Special Issue Application of Photocatalysts in Air Pollution)
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16 pages, 4872 KiB  
Article
Comparing the Photocatalytic Oxidation Efficiencies of Elemental Mercury Using Metal-Oxide-Modified Titanium Dioxide under the Irradiation of Ultra-Violet Light
by Ji-Ren Zheng and Chung-Shin Yuan
Catalysts 2024, 14(3), 209; https://doi.org/10.3390/catal14030209 - 20 Mar 2024
Viewed by 608
Abstract
Since the signing of the Minamata Convention in 2013, attempts have been primarily focused on reducing the emission of elemental mercury (Hg0) from coal-fired power plants (CFPPs). The most cost-effective measure for controlling the emission of mercury involves oxidizing Hg [...] Read more.
Since the signing of the Minamata Convention in 2013, attempts have been primarily focused on reducing the emission of elemental mercury (Hg0) from coal-fired power plants (CFPPs). The most cost-effective measure for controlling the emission of mercury involves oxidizing Hg0 to mercury oxides, which are then removed using wet flue gas desulfurization (WFGD). Thus, novel photocatalysts with the best properties of photocatalytic ability and thermal stability need to be developed urgently. In this study, titanium dioxide (TiO2)-based photocatalysts were synthesized through the modification of three metal oxides: CuO, CeO2, and Bi2O3. All the photocatalysts were further characterized using X-ray diffraction, X-ray photoelectron spectroscopy, photoluminescence, and ultraviolet-visible spectrometry. The photocatalytic oxidation efficiencies of Hg0 were evaluated under an atmosphere of N2 + Hg0 at 100–200 °C. The photocatalytic reactions were simulated by kinetic modeling using the Langmuir–Hinshelwood (L–H) mechanism. The results showed that Bi2O3/TiO2 exhibited the best thermal stability, with the best oxidation efficiency at 200 °C and almost the same performance at 100 °C. L–H kinetic modeling indicated that photocatalytic oxidation reactions for the tested photocatalysts were predominantly physical adsorption. Additionally, the activation energy (Ea), taking into account Arrhenius Law, decreased dramatically after modification with metal oxides. Full article
(This article belongs to the Special Issue Application of Photocatalysts in Air Pollution)
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18 pages, 12136 KiB  
Article
Prominent COF, g-C3N4, and Their Heterojunction Materials for Selective Photocatalytic CO2 Reduction
by Panagiota Bika, Ilias Papailias, Tatiana Giannakopoulou, Christos Tampaxis, Theodore A. Steriotis, Christos Trapalis and Panagiotis Dallas
Catalysts 2023, 13(10), 1331; https://doi.org/10.3390/catal13101331 - 29 Sep 2023
Cited by 2 | Viewed by 1376
Abstract
New heterojunction materials (HJs) were synthesized in-situ by molecularly bonding the monomers of a triazine-based covalent organic framework (bulk COF) on the template of exfoliated carbon nitride (g-C3N4). The photocatalysts reduced carbon dioxide to carbon monoxide in aqueous dispersions [...] Read more.
New heterojunction materials (HJs) were synthesized in-situ by molecularly bonding the monomers of a triazine-based covalent organic framework (bulk COF) on the template of exfoliated carbon nitride (g-C3N4). The photocatalysts reduced carbon dioxide to carbon monoxide in aqueous dispersions under UV irradiation. The g-C3N4 showed production of 6.50 μmol CO g−1 h−1 and the bulk COF of 2.77 μmol CO g−1 h−1. The CO yield was evaluated in sustainability photoreduction cycles and their CO2 uptake capacity and isosteric heat of adsorption were estimated. All the heterojunction photocatalysts obtained ameliorated CO production rates compared to the bulk COF. Finally, the influence of the Pt co-catalyst on the photocatalytic activities was determined without the addition of any sacrificial agent, and the COF:g-C3N4 heterojunction with the ratio of 1:10 was proven to be a photocatalytic system with an optimum and selective, CO yield of 7.56 μmol g−1 h−1. Full article
(This article belongs to the Special Issue Application of Photocatalysts in Air Pollution)
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