Photocatalytic Properties of Semiconductive Oxide Nanoparticles. From Fundamentals to Applications
Date
2013Author
Ibănescu (Bușilă), Mariana
Mușat, Viorica
Textor, Torsten
Mahltig, Boris
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Photocatalysis is a promising technology that demonstrated important
applications in environmental systems such as air purification, pollution removal,
self-cleaning and antimicrobial. Semiconductive oxides (e.g., ZnO, TiO2, CuO) are
important photocatalytic materials that can act as sensitizes for light based redox
processes due to their electronic structure, which is characterized by the
conduction-band with electrons (good reductants) and the valence band with holes
(powerful oxidants). Excitation of electrons from the conduction-band and valenceband
holes can react with electron donors and electron acceptors adsorbed on the
semiconductor surface and electric double layer around the particles. The band gap
value determines the semiconductive behavior of oxide nanoparticles. The
absorption of UV-Vis radiation is an important tool for evaluating photocatalytic
behavior of the obtained semiconductive nanoparticles. In this paper we present the
correlation between the band gap value, particle size and the photocatalytic activity
of ZnO nanoparticles prepared via an aqueous solution chemical method.
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- 2013 fascicula9 nr2 [14]