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holes can recombine, or they can migrate to the surface. In this excited state, titanium dioxide acts as catalyst for many reactions, and in aqueous solutions, reactive radicals are formed (6–10). Figure 6. Mechanism of photocatalysis. Band gap (a

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Decontamination and disinfection of water by solar photocatalysis, recent overview and trends . Catal Today 49 : 1 – 14 . 12. Ohtani , B 2008 Preparing articles on

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problems in the study of these types of reactions concern the mechanism of catalyst function, kinetics, and characterization of the products. As far as the mechanism of photocatalysis is concerned, it is well known that the irradiation of catalyst

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scheme of the photocatalytic reactor setup is shown in Fig. 1 . The reactor was constructed as an improvement of a previous plexiglass reactor [ 14 ], which could only operate with UV light and at room temperature—the main advantage of photocatalysis

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Introduction The photocatalyst, for example, titanium dioxide (TiO 2 ) absorbs light with suitable wavelength in photocatalysis. An electron from the valence band is transferred to the conduction band and creates negative

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of MoS 2 . As a result, the band gap of nano-MoS 2 becomes small enough to allow most of the solar spectrum to be absorbed, leading to potential applications in photocatalysis [ 14 – 17 ]. Recently, MoS 3 /TiO 2 and MoS 3 /kaolin precursors

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/L Mechanism of the promoted photocatalysis The heterogeneous photocatalytic degradation of methyl orange by semiconductors has been investigated widely and the photocatalytic mechanism of TiO 2 has been reported frequently [ 25 ]. TiO 2 particles

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Introduction Semiconductor photocatalysis has attracted extensive attention due to its wide potential application in environmental protection activities such as air purification, hazardous waste remediation, and water

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Reaction Kinetics, Mechanisms and Catalysis
Authors:
Ekkachai Kanchanatip
,
Nurak Grisdanurak
,
Raumporn Thongruang
, and
Arthit Neramittagapong

adsorption and photocatalysis reductions under UV have been applied to degrade paraquat concentrations to within the acceptable levels [ 3 – 6 ]. Among the techniques, photocatalytic oxidation is quite promising because the pollutant is almost completely

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. Asahi , R , Morikawa , T , Ohwaki , T , Aoki , K , Taga , Y 2001 Visible-light photocatalysis in nitrogen-doped titanium oxides . Science 293 : 269 – 271 10.1126/science.1061051 . 9

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