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Catalysts
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Recent Advances in Photocatalytic Wastewater Treatment
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Recent Advances in Photocatalytic Wastewater Treatment

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

Deadline for manuscript submissions: 30 June 2025 | Viewed by 1414

Special Issue Editors

Dr. Maria Antonopoulou

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Guest Editor
Department of Sustainable Agriculture, University of Patras, GR-30131 Agrinio, Greece
Interests: photocatalysis; visible-light photocatalysts; water treatment; hybrid systems; decontamination; detoxification; reactive species; transformation products
Special Issues, Collections and Topics in MDPI journals
Dr. Zacharias Frontistis

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Western Macedonia, GR-50132 Kozani, Greece
Interests: advanced oxidation processes; electrochemistry; photocatalysis; persulfate; sonochemistry; wastewater treatment
Special Issues, Collections and Topics in MDPI journals
Dr. Alexandra Ioannidi

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece
Interests: photocatalysis; advanced oxidation processes; wastewater engineering; micropollutants; disinfection

Special Issue Information

Dear Colleagues,

Photocatalysis, which includes the activation of a photocatalyst by UV and/or visible radiation, is one of the most representative advanced oxidation processes (AOPs) that has attracted scientific concern for various environmental applications. In recent decades, intensive research efforts have focused on the development of photocatalytic systems with improved efficiency, predominantly using renewable energy sources for wastewater treatment. However, despite high efficiency at the laboratory scale, there are still many limitations that inhibit the practical application of photocatalysis in wastewater treatment processes. Moreover, the complex composition of various kinds of wastewater that require effective treatment at low cost renders the development of hybrid systems a promising alternative that can enhance efficiency, leading to high removal percentages of pollutants.

Based on the above, authors are welcome to submit original articles and reviews on, but not limited to, the following topics:

  • Photocatalytic wastewater treatment;
  • Decomposition of organic and inorganic pollutants;
  • Detoxification and disinfection of highly polluted wastewater;
  • Hybrid systems for wastewater treatment and decontamination;
  • Synthesis and characterization of novel visible-light photocatalysts with improved performance;
  • Simultaneous photocatalytic degradation of pollutants and hydrogen production;
  • Photocatalytic CO2 reduction;
  • Mechanistic studies and simulation of photocatalytic activity;
  • Pilot-scale applications.

If you would like to submit papers to this Special Issue or have any questions, please contact the in-house editor, Mr. Ives Liu (ives.liu@mdpi.com).

Dr. Maria Antonopoulou
Dr. Zacharias Frontistis
Dr. Alexandra Ioannidi
Guest Editors

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 submissions that pass pre-check are 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 2200 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

  • photocatalysis
  • visible-light photocatalysts
  • water treatment
  • hybrid systems
  • decontamination
  • detoxification
  • reactive species
  • transformation products

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

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22 pages, 3759 KiB  
Article
Molybdenum Telluride-Promoted BiOCl Photocatalysts for the Degradation of Sulfamethoxazole Under Solar Irradiation: Kinetics, Mechanism, and Transformation Products
by Alexandra A. Ioannidi, Konstantinos Kouvelis, Gkizem Ntourmous, Athanasia Petala, Dionissios Mantzavinos, Maria Antonopoulou and Zacharias Frontistis
Catalysts 2025, 15(1), 59; https://doi.org/10.3390/catal15010059 - 10 Jan 2025
Viewed by 736
Abstract
This work examines the solar photocatalytic degradation of the antibiotic sulfamethoxazole (SMX) using molybdenum telluride (MoTe2)-promoted bismuth oxychloride (BiOCl). Different loadings of molybdenum telluride in the 0–1% range on BiOCl were synthesized and evaluated. Although the presence of MoTe2 did [...] Read more.
This work examines the solar photocatalytic degradation of the antibiotic sulfamethoxazole (SMX) using molybdenum telluride (MoTe2)-promoted bismuth oxychloride (BiOCl). Different loadings of molybdenum telluride in the 0–1% range on BiOCl were synthesized and evaluated. Although the presence of MoTe2 did not alter either the adsorption capacity or the energy gap of BiOCl, the synthesized photocatalyst demonstrated higher photocatalytic activity due to the enhanced separation of photogenerated pairs. The 0.5MoTe2/BiOCl photocatalyst achieved a kinetic constant nearly 2.8 times higher than that of pure BiOCl, leading to the elimination of 500 μg/L SMX within 90 min. The system’s performance was enhanced under neutral to acidic conditions and lower SMX concentrations. Based on experiments with radical scavengers, photogenerated holes appeared to be the dominant species, with the contribution of reactive species following the order h+>O2•−/e−>1O2>HO•. Interestingly, in different water matrices, photocatalytic activity was not diminished and even increased by 20%, likely because of the action of photogenerated holes and the selectivity of secondary generated radicals. The photocatalyst retained > 90% of its activity after three sequential experiments. Finally, four transformation products from SMX photodegradation were identified via UHPLC-TOF-MS, and a degradation pathway is proposed. Full article
(This article belongs to the Special Issue Recent Advances in Photocatalytic Wastewater Treatment)
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Review

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32 pages, 16925 KiB  
Review
Recent Advances in Iron Oxide-Based Heterojunction Photo-Fenton Catalysts for the Elimination of Organic Pollutants
by Yiqian Wu, Cong Wang, Lan Wang and Chen Hou
Catalysts 2025, 15(4), 391; https://doi.org/10.3390/catal15040391 - 17 Apr 2025
Viewed by 213
Abstract
Organic pollutants released into water bodies have posed a serious threat to aquatic ecosystems. The elimination of organic pollutants from water through the photo-Fenton process has attracted extensive attention. Among various photo-Fenton catalysts, iron oxides have been intensively studied due to their environmentally [...] Read more.
Organic pollutants released into water bodies have posed a serious threat to aquatic ecosystems. The elimination of organic pollutants from water through the photo-Fenton process has attracted extensive attention. Among various photo-Fenton catalysts, iron oxides have been intensively studied due to their environmentally benign characteristics and abundance. However, the rapid recombination of photogenerated charge carriers (e−–h+) and slow Fe(III)/Fe(II) cycling of iron oxides restrict their catalytic performance. Thus, this state-of-the-art review focuses on the recent research development regarding iron oxide-based heterojunctions with enhanced catalytic performance to eliminate organic pollutants. This review provides a fundamental understanding of the iron-based heterogeneous photo-Fenton reaction. In addition, various heterojunctions for photocatalytic applications are comprehensively summarized. A thorough discussion is held on the material design for iron oxide-based heterojunctions with improved photo-Fenton catalytic performance. Ultimately, the challenges and prospects of iron oxide-based heterojunction catalysts for photo-Fenton water decontamination are outlined. Full article
(This article belongs to the Special Issue Recent Advances in Photocatalytic Wastewater Treatment)
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