Advanced Semiconductor Photocatalysts

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

Deadline for manuscript submissions: 31 December 2025 | Viewed by 594

Special Issue Editors

1. Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
2. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Interests: photocatalysis; green synthesis; wastewater treatment; heavy metals and radioactive ions sorption; environmental contaminant degradation
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Guest Editor
1. Nuclear Materials Authority, POB 530, El-Maadi, Cairo 11728, Egypt
2. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Interests: sorption of radioactive ions; photocatalysis; heavy metal removal; wastewater treatment
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Interests: photocatalysis; environmental radiochemistry; environment function material; environmental remediation

E-Mail Website
Guest Editor
School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Interests: photocatalytic hydrogen production; heterojunctions; visible-light photocatalysis; wastewater treatment

Special Issue Information

Dear Colleagues,

Photocatalysis is a cost-effective, environmentally friendly, and efficient approach integrated into physical, chemical, and biological sciences for removing and degrading different environmental pollutants such as organic contaminants, heavy metals, dyes, radioactive materials, and microbial contaminants under light sources (visible light or UV). The unique features of semiconductor materials such as Si, CdS, Ge, ZnO, TiO2, Fe2O3, etc. make them promising tools in various sectors such as electronic devices, photocatalysis, nanotechnology, and solar cells. The successful construction of semiconductor photocatalysts depends on one or more of the following keys: the excitation rate of photoinduced electron-hole pairs, redox capacity, light absorption efficacy, and semiconductor active sites, catalyst concentrations, and recyclability. The free radicals are produced as a result of the interaction of photoinduced electron-hole pairs with contaminants under light irradiation conditions leading to the production of CO2, H2O, and less harmful substances.

This Special Issue covers recent investigations in semiconductor photocatalysis including different methods for synthesis, applications, and comprehensive mechanism discussions, and it may potentially include the following topics (not limited):

  • Removal of heavy metals under photocatalytic reaction compared to dark conditions;
  • Wastewater treatment;
  • Radioactive materials removal from water samples;
  • Semiconductor photocatalysts and different biological activities;
  • CO2 reduction and clean fuel resources;
  • Water splitting and hydrogen generation;
  • Design and applications of step scheme (S-scheme) heterojunction;
  • Donor-acceptor-based conjugated polymers;
  • Environmental contaminants remediation.

If you would like to submit papers for publication in this Special Issue or have any questions, please contact the in-house Editor, Ms. Georgie Guan (georgie.guan@mdpi.com).

Dr. Amr Fouda
Dr. Mohammed F. Hamza
Prof. Dr. Ningchao Zheng
Prof. Dr. Deqian Zeng
Guest Editors

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Keywords

  • semiconductors
  • photocatalytic reaction
  • nanomaterials
  • heavy metals
  • radioactive ions
  • wastewater
  • dyes
  • inorganic and organic pollutants
  • biological activities and photocatalytic mechanisms

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Published Papers (1 paper)

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Research

24 pages, 3268 KB  
Article
Photocatalytic Activity of Green-Synthesized Semiconductor CuO/ZnO Nanocomposites Against Organic Dye: An Assessment of Antimicrobial and Cytotoxicity Investigations
by Amr Fouda, Sultan M. Alsharif, Ahmed M. Eid, Abeer S. Albalawi, Mohamed A. Amin, Faisal A. Alraddadi, Abeer M. Almutrafy, Duaa A. Bukhari, Noura A. Algamdi and Mohamed Ali Abdel-Rahman
Catalysts 2025, 15(12), 1096; https://doi.org/10.3390/catal15121096 - 21 Nov 2025
Viewed by 537
Abstract
In this paper, by employing an eco-friendly and green approach, semiconductor CuO/ZnO nanocomposite are synthesized using an aqueous extract of Urtica urens. FT-IR, XRD, TEM, SAED, EDX, TGA, and UV-Vis spectroscopy were used for semiconductor characterization. The data revealed the successful formation [...] Read more.
In this paper, by employing an eco-friendly and green approach, semiconductor CuO/ZnO nanocomposite are synthesized using an aqueous extract of Urtica urens. FT-IR, XRD, TEM, SAED, EDX, TGA, and UV-Vis spectroscopy were used for semiconductor characterization. The data revealed the successful formation of crystalline spherical nanocomposites with sizes ranging from 5 to 45 nm. The main components of the synthesized nanocomposites were Cu, Zn, and O, which had different weights and atomic percentages. The maximum absorbance of nanocomposites was 358 nm, with a direct bandgap of 2.25 eV, which is suitable for photocatalysis under visible light. The maximum photocatalytic activity of the synthesized semiconductor nanocomposites for photodegradation of methylene blue dye was 95.8%, where it was 44.5% and 65.5% for monometallic CuO and ZnO, respectively. The optimum conditions for maximum photocatalytic activity were a pH of 9, a dye concentration of 5 mg L−1, and nanocomposite concentration of 1.0 mg mL−1 after 70 min. The reusability of the synthesized semiconductor was promising for the fourth cycle, with a reduced capacity of 5%. Complementary investigations, antimicrobial activity and cytotoxic activity, were performed to increase the application of semiconductor nanocomposites. The data revealed the promising activity of the nanocomposite against E. coli, P. aeruginosa, B. subtilis, S. aureus, C. parapsilosis, C. albicans, and C. tropicalis with low MICs ranging between 50 and 25 µg mL−1. Additionally, compared with normal cell line, the synthesized nanocomposite targeted the cancer cell line HepG2 with a low IC50 value of 69.9 µg mL−1 (vs. IC50 220 µg mL−1 of normal cell line HFB4). Overall, the green-synthesized semiconductor CuO/ZnO nanocomposite showed promising activity as environmental contaminant cleaner and was integrated with antimicrobial and in vitro cytotoxic activities. Full article
(This article belongs to the Special Issue Advanced Semiconductor Photocatalysts)
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