Resumen

ALVARADO-DE LA VEGA, Mario Alberto et al. EFFECT OF TITANIUM’S DIOXIDE PARTICLE SIZE IMMOBILIZED ON THE PHOTOCATALYTIC OXIDATION OF PURPLE OF BROMOCRESOL. Rev. Int. Contam. Ambient [online]. 2021, vol.37, 54008.  Epub 06-Jun-2022. ISSN 0188-4999.  https://doi.org/10.20937/rica.54008.

Pollution of sewage water with organic matter and aromatic compounds is a complex problem that is constantly in need of more efficient systems for its treatment. The objective of this works is to evaluate the effect of TiO2 particle size in the photocatalytic oxidation of bromocresol purple, used as a model of organic polluter. TiO2 was immobilized on a borosilicate substrate through the coating by immersion technic and was characterized by atomic force microscopy (AFM) to evaluate the morphology of the obtained surface. The anatase crystalline structure of TiO2 was confirmed by X ray diffraction (DRX) and its particle size was evaluated by dynamic light scattering (DSL). The effects of 25- and 300- nm TiO2 particles on the degradation of bromocresol purple at 5, 10, 20 and 30 ppm concentrations were evaluated. Kinetics of the bromocresol purple (PBC) degradation reaction was pseudo first order, consistent with the Langmuir model for low concentrations of this dye. The photodegradation in 25-nm TiO2 particles was more efficient than in 300 nm, due to the greater number of grains formed on the surface, thus promoting a greater number of available active sites.

Palabras llave : stain; photocatalysis; semiconductor; cladding by immersion; catalyst.