Photocatalysis, ultraviolet light

Venkatadri, R. and Peters, R.W., Chemical oxidation technologies ultraviolet light/ hydrogen peroxide, Fenton s reagent, and titanium dioxide-assisted photocatalysis, Hazardous Waste Hazardous Mater., 10, 107-149, 1993. 

Calvert 124), sintered cuprous oxide present as a thin layer on bulk copper also shows photocatalysis of CO oxidation when irradiated with ultraviolet light at 25°. These authors observed that the addition of sulfur or antimony in solid solution, which increased the conductivity of the oxide, decreased the photoeffect, but the reason for this particular choice of dopents is obscure. 

With photocatalysis the main problems encountered in the previously examined applications of PVRs are avoided. It is also worth noting that (i) the coupling of photocatalysis with the pervaporation process allows for a complementary exploitation of the solar spectrum. In fact, photocatalysis is normally only able to use its ultraviolet component, while the remaining thermal part of the spectrum can be utilized to heat the fluid and to evaporate the permeate (ii) photocatalysis and pervaporation have common operative conditions liquid solutions (often aqueous solutions), low concentrations of the reactants and consequently of the products, low temperature and atmospheric pressure and (iii) once the type of light source is chosen, photocatalysis is a modular process like pervaporation. Therefore the integration of the two processes is straightforward and advantageous. 

Sarina S., Waclawik E. R., and Zhu H. Photocatalysis on supported gold and silver nanoparticles under ultraviolet and visible light irradiation. Green Chemistry. 15 no. 7... 

Such photocatalysis can also be induced by slight ultraviolet radiation due to fluorescent lights, etc. In 2001, the nitrogen-doped TiO photocatalyst to enable a photocatalysis under visible light was developed [2], and has attracted much attention since then. More recently C-doped photocatalysts have been developed [6]. Construction materials with TiO photocatalyst develop the major performance or functions as shown in Fig. 1.3 [16, p. 21 24, p. 12], based on both effects of strong decomposition power and high water-wettability. 

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