Enhanced Photocatalytic Activity of TiO₂-Coated NaY and HY Zeolites for the Degradation of Methylene Blue in Water

Abstract

The TiO 2 -coated zeolite photocatalysts were prepared by dispersing zeolite powders in dilute titanium tetraisopropoxide solution. The characterization of the catalysts was carried out by X-ray diffraction, scanning electron microscopy, and N 2 adsorption. The presence of TiO 2 on zeolite surface was confirmed by UVvisible diffuse reflectance spectroscopy. The photocatalytic activity of TiO 2 -coated NaY and HY zeolite was investigated by degradation of aqueous solution of methylene blue dye. The highest photocatalytic activity was obtained with 1% TiO 2 -coated zeolite catalysts. This study demonstrated that the photocatalytic activity of TiO 2 -coated catalyst is higher than that of bare TiO 2 at a low amount of TiO 2 coating on the zeolite surface.

Elucidation of Reaction Behaviors in Sonocatalytic Decolorization of Amaranth Dye in Water Using Zeolite Y Co-Incorporated with Fe and TiO<sub>2</sub>

“…Dried H-Y zeolite was first converted to its sodium form by means of an ion-exchange method [7]. The zeolite was washed with 1 M NaCl at 80˚C for 4 h in such a way that the ratio of zeolite to sodium chloride solution was 1:80.…”

Zeolite Y encapsulated with Fe-TiO2 for ultrasound-assisted degradation of amaranth dye in water

“…The dried H-Y zeolite was first converted to its sodium form by means of an ion-exchange method [18]. The zeolite was washed with 1 M NaCl at 80 • C for 4 h in such a way that the ratio of zeolite to sodium chloride solution was 1:80.…”

Study on crystallinity and morphology controlling of titania using acrylamide gel method and their photocatalytic properties

“…The formation of the intermediates is dependent on the interaction of the dye with the active species (OH radicals). In other words, it must be noted that adsorption of organic compounds does help in enhancing the photocatalytic activity of the TiO 2 particles as it brings the organic molecules in proximity to photoactive sites [45]. Most H + ions would adsorb onto the weakly, negative charged surface of TiO 2 and few would diffuse away while the closely diffused anions (counterions of acids) would act as a bridging electrolyte that compressed the double layer of the TiO 2 sol [46], leading to the flocculation of the TiO 2 particles with the adsorbed dye in the dark and enhancing the subsequent photocatalysis.…”