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Photocatalysis for a Green Future: Breaking Barriers in Energy, Environment, and Healthcare

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 951

Special Issue Editor


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Centro de Recursos Naturais e Ambiente (CERENA), Chemical Engineering Department, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
Interests: nanomaterials; microspheres; sol-gel; polymer gels; semiconductors; catalysis; photocatalysis; environmental remediation
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Special Issue Information

Dear Colleagues,

Photocatalysis is a revolutionary process leveraging light energy to expedite chemical reactions; it presents a multitude of advantages, including environmental sustainability, energy efficiency, and the capacity to decompose pollutants. Its applications range widely, encompassing water purification, air quality enhancement, self-cleaning surfaces, advanced medical treatments, and even energy generation. This versatile technology not only addresses contemporary challenges but also contributes significantly to sustainable solutions across diverse domains.

The primary drawback of this method lies in the selection of semiconductor materials. Numerous semiconductors exhibit limitations, including a high rate of recombination of photogenerated electron–hole pairs within the semiconductor and a low absorption of radiation in the visible range. Consequently, the quest for novel semiconductor materials with enhanced properties has garnered the attention of researchers, leading to the exploration of innovative solutions.

In this context, this Special Issue, “Photocatalysis for a Green Future: Breaking Barriers in Energy, Environment, and Healthcare” will compile recent developments in the field of new semiconductor materials for several photocatalytic applications. 

The articles presented in this Special Issue will cover various topics, such as the following:

  • The synthesis and characterization of novel photocatalysts;
  • The photocatalytic synthesis of organic and inorganic compounds;
  • Photocatalytic materials to address specific sustainability challenges;
  • Applications of photocatalysts in different areas:
    • Wastewater and air treatment;
    • Energy conversion;
    • Drug delivery;
    • others;
  • Critical reviews and perspectives on photocatalyst applications.

Dr. Beatriz Trindade Barrocas
Guest Editor

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Keywords

  • novel photocatalysts
  • semiconductor
  • photocatalysis
  • environmental applications
  • water splitting
  • wastewater treatment
  • air purification
  • pollutants photocatalytic removal
  • energy conversion
  • drug delivery

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Published Papers (1 paper)

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Research

15 pages, 3912 KiB  
Article
Treatment of Aqueous Amoxicillin Solutions with Sunlight Using a Pelletized Macrocomposite Photocatalyst
by Saad Slimani Tlemcani, Zenydia Marín, J. Arturo Santaballa and Moisés Canle
Materials 2025, 18(7), 1394; https://doi.org/10.3390/ma18071394 - 21 Mar 2025
Viewed by 316
Abstract
We report on the preparation and characterization of a cost-effective, durable, and reusable macrocomposite, prepared in the form of pellets and designed for the photodegradation of water pollutants, using amoxicillin (AMX) as a model compound. Using the wet impregnation method, kaolin clay and [...] Read more.
We report on the preparation and characterization of a cost-effective, durable, and reusable macrocomposite, prepared in the form of pellets and designed for the photodegradation of water pollutants, using amoxicillin (AMX) as a model compound. Using the wet impregnation method, kaolin clay and TiO2-P25 composites were doped with copper (Cu2+) and cobalt (Co2+). The produced materials were characterized by SEM-EDS, XRD, XRF, textural property analysis, and their potential lixiviation of components by ICP-MS. The photodegradation efficiency under solar irradiation was evaluated by varying the acidity of the medium, the concentration of AMX, and the amount of catalyst. The performance of the recycled photocatalysts was also studied. The photodegradation of AMX was monitored by UV–Vis and UV–Vis/HPLC spectrophotometry. The optimal formulations, Cu (0.1%)/TiO2 and Co (0.1%)/TiO2, achieved up to 95% degradation of 5 mg·L−1 AMX in 3 h at pH 5.9, with a catalyst loading of 1 g·L−1. The Cu-doped material showed a slightly faster reaction rate and higher total-organic-carbon removal (80.4%) compared to the Co-doped material (59%) under identical conditions. The same photodegradation intermediates were identified by LC-MS/MS for both doped macrocomposites, and a reaction mechanism is proposed. These macrocomposites showed efficient and consistent recyclability over more than five reuse cycles, showing their potential to be used for antibiotic pollution abatement in water-treatment facilities. Full article
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