Photocatalytic reactions over TiO2 supported on porcelain spheres

PET as a support material for TiO2 in advanced oxidation processes

“…On the other hand, surface area played a key role in the results obtained, being demonstrated that the increase in the covering of the PET support resulted in higher photocatalytic activity, up to the maximum kinetic constant observed for the films 5×, 10×, and 15×. Finally, after complete covering of the PET support—achieved with five immobilization steps—additional amounts of deposited TiO 2 are expected to have increased the thickness of the films beyond the 6 µm found to film 10×, possibly making a greater number of pores and surface area available. Such effect, if happened, could explain the slight changes observed in the kinetic constants for films 5×, 10×, and 15×.…”

“…In AOPs TiO 2 photocatalyst has been used in aqueous medium either in the dispersed form or immobilized on the surface of support materials . Its use as an aqueous dispersion is expected to be energetically more efficient since, within certain limits, greater area of the photocatalyst is available.…”

“…The immobilization procedure developed can be considered environmentally friendly, since small amounts of chemicals are used and almost no residues are generated. It also shows the advantage of low‐energy consumption by not involving heating steps, while temperatures up to some hundreds of degrees Celsius may be required, especially when glass supports are used . To enhance the adsorption of TiO 2 particles onto PET surfaces, the use of alkaline surface modification of PET and thermal treatment above 200°C has also been reported …”

Metomyl photo-degradation kinetics through advanced oxidation technologies

“…El TiO 2 utilizado con fotocatalizador puede ser incorporado por medio de la impregnación de perlas de vidrio (Serpone et al, 1986), que pueden prepararse siguiendo los protocolos descritos en la literatura (Litter, 2005;Piperata et al, 2004). Como ejemplo, para la impregnación de las perlas de porcelana se deja durante dos horas una cantidad específica en contacto con una solución de ácido nítrico 0,1 M. Luego se lava y seca a 100°C.…”

TiO2-Coated Cenospheres as Catalysts for Photocatalytic Degradation of Methylene Blue, p-Nitroaniline, n-Decane, and n-Tridecane under Solar Irradiation

“…The saturated hydrocarbons that have a density less than 1 g cc −1 get concentrated on the aqueous surface and take a longer time to decompose while using such catalysts. To overcome these problems, attempts have been made to prepare TiO 2 -coated buoyant materials such as polystyrene beads, sand, activated carbon, porcelain beads, and ceramic microspheres. − These studies reported successful photooxidation but showed a lack of reusability due to leaching of photocatalytic material during use. Therefore, the strong adhesion of photocatalytic material on buoyant surface is needed so that the coating is stable even after multiple uses.…”