By Marta I. Litter, Roberto J. Candal, J. Martin Meichtry
Advanced Oxidation applied sciences (AOTs) or procedures (AOPs) are rather new and leading edge applied sciences to take away destructive and poisonous toxins. crucial techniques between them are these utilizing gentle, equivalent to UVC/H2O2, photo-Fenton and heterogeneous photocatalysis with TiO2. those applied sciences also are really reasonably cheap and consequently necessary for international locations lower than improvement, the place the not pricey assets are scarcer than in built countries.
This ebook offers a cutting-edge assessment on environmental functions of complex Oxidation applied sciences (AOTs) as sustainable, inexpensive and low-energy eating remedies for water, air, and soil. It comprises info on cutting edge learn and improvement on TiO2 photocatalytic redox procedures, Fenton, Photo-Fenton approaches, zerovalent iron expertise, and others, highlighting attainable purposes of AOTs in either constructing and industrialized nations all over the world within the framework of “A crosscutting and complete examine environmental problems”.
The publication is geared toward pros and lecturers world wide, operating within the components of water assets, water provide, environmental safety, and may be an invaluable info resource for determination and coverage makers and different stakeholders engaged on recommendations for environmental problems.
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Additional resources for Advanced Oxidation Technologies: Sustainable Solutions for Environmental Treatments
Photocatalysis occurs due to absorption of a photon with sufficient energy either equal or higher than the band gap energy (difference between the valence band and the conduction band of the semiconductor) of the catalyst. When TiO2 is excited with light, an electron is promoted from the valence band to the conduction band, generating a hole (h+ ) in the valence band and an electron (e− ) in the conduction band. The photogenerated charge carriers can either migrate to the surface of the TiO2 , where it can actively perform its role in the oxidation-reduction reactions with the pollutant or recombine in the bulk or on the TiO2 surface.
The AOTs presented in this book are mainly TiO2 photocatalysis (HP) and photo-Fenton, but others like UV/H2 O2 , enzyme/H2 O2 , peracetic acid and UV photolysis are also exemplified. ARTs are emerging technologies from which reductive TiO2 heterogeneous photocatalysis and use of zerovalent iron nanoparticles are increasingly studied in last times. The use of zerovalent iron, especially in the form of nanoparticles, is a very economic novel tool for removal of contaminants from water and has been successfully tested in batch and in-situ treatments, while TiO2 heterogeneous photocatalysis is especially investigated for the treatment of organic pollutants and heavy metal ions.
2011). The most prominent TiO2 photocatalyst, Degussa P25 (now known as AEROXIDE®TiO2 P25) has demonstrated good performance in photocatalytic applications. Although TiO2 P25 has been widely used as a benchmark photocatalyst, its effectiveness has been limited by poor light absorption in the visible region, as a result of its large band gap. Mechanistic processes of TiO2 induced photocatalytic degradation of organic pollutants are well described in the literature (Herrmann, 2010). Photocatalysis occurs due to absorption of a photon with sufficient energy either equal or higher than the band gap energy (difference between the valence band and the conduction band of the semiconductor) of the catalyst.