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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:15 |
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Conference: Bucharest University Faculty of Physics 2024 Meeting
Section: Solid State Physics and Materials Science
Title:
Visible‑light active photocatalytic layers for antibiotics removal from wastewater
Authors:
Raluca IVAN (1,2), Stefan ANTOHE (2), Vlad Andrei ANTOHE (2), Angel PÉREZ DEL PINO (3), Eniko GYÖRGY (1,3)
*
Affiliation:
1) National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor street, Magurele, ROMANIA
2) University of Bucharest, Faculty of Physics, 405 Atomistilor street, Magurele, ROMANIA
3)Institute of Materials Science of Barcelona, Bellaterra, Barcelona, SPANIA
E-mail
raluca.ivan@inflpr.ro
Keywords:
photocatalytic, wastewater, MAPLE
Abstract:
Semiconductor photocatalysts have been the subject of significant attention as a simple time and energy-efficient technology to convert organic pollutants into eco-friendly mineralized byproducts under solar irradiation. Several semiconductor photocatalysts, including transition metal oxides, hydroxides, sulfides, phosphates, and dimensional (2D) materials were widely investigated for wastewater treatment by degrading organic molecules under light irradiation. However, most of these materials present a wide band gap, and thus optical absorption is limited to the UV spectral range leading to low photodegradation efficiency, a main drawback for practical applications. Many efforts have been focused on finding photocatalyst materials that could overcome the drawback of the wide band gap photocatalysts. Lower band gap metal oxides, such as iron oxides and hydroxides are currently considered for photocatalytic applications, owing to their favourable properties such as high chemical stability, wide abundance, and low toxicity. This study was focused on the growth of photocatalytic nanostructures based on iron oxides and graphene-like reduced and nitrogen-doped graphene oxide, aiming to increase the lifetime of photogenerated electron-hole pairs and thus to enhance the photocatalytic efficiency in the visible spectral region. These nanostructures were grown on a solid substrate in one single step using a laser technique called ,,Matrix-Assisted Pulsed Laser Evaporation” (MAPLE), without any post-processing treatments. The prepared layers were used for the decomposition of chloramphenicol molecules, one of the most used antibiotics, by irradiation in the visible range of the solar spectrum.
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