Design of composite photocatalyst of TiO2 and Y-zeolite for degradation of 2-propanol in the gas phase under UV and visible light irradiation.

Takashi Kamegawa,Hiromi Yamashita,Yasushi Ishiguro,Ryota Kido

doi:10.3390/molecules191016477

Takashi Kamegawa, Hiromi Yamashita + Show 2 more

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https://doi.org/10.3390/molecules191016477

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Abstract

Hydrophobic Y-zeolite (SiO2/Al2O3 = 810) and TiO2 composite photocatalysts were designed by using two different types of TiO2 precursors, i.e., titanium ammonium oxalate and ammonium hexafluorotitanate. The porous structure, surface property and state of TiO2 were investigated by various characterization techniques. By using an ammonium hexafluorotitanate as a precursor, hydrophobic modification of the Y-zeolite surface and realizing visible light sensitivity was successfully achieved at the same time after calcination at 773 K in the air. The prepared sample still maintained the porous structure of Y-zeolite and a large surface area. Highly crystalline anatase TiO2 was also formed on the Y-zeolite surface by the role of fluorine in the precursor. The usages of ammonium hexafluorotitanate were effective for the improvement of the photocatalytic performance of the composite in the degradation of 2-propanol in the gas phase under UV and visible light (λ > 420 nm) irradiation.

Highlights

Titanium dioxide (TiO2)-based photocatalytic materials have been used for the decomposition of undesired and harmful organic compounds in the air and water [1,2,3,4,5,6,7]
Both samples exhibited the typical absorption in the UV light region corresponding to the band gap energy of TiO2 particles loaded on Y-zeolite
The blue shifts of absorption spectra suggest that TiO2 nanoparticles are successfully loaded on the Y-zeolite surface with a dispersed state

Summary

Introduction

Titanium dioxide (TiO2)-based photocatalytic materials have been used for the decomposition of undesired and harmful organic compounds in the air and water [1,2,3,4,5,6,7]. TiO2-based photocatalytic materials are continuously researched for their importance in relation to the utilization of light energy for the synthesis of chemicals, the production of clean energy, etc., under carefully-controlled conditions [8,9,10,11,12,13]. TiO2-based photocatalytic materials have potential to solve the problem of air pollution by volatile organic compounds in our living spaces, i.e., the cause of sick house syndrome emitted from interiors. Utilization of visible light is achieved by the anchoring of phenolic compounds on the TiO2 surface by the formation of surface complexes [12,13]

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