TY - JOUR
T1 - Synthesis, characterization and photocatalytic activity evaluation of WO3, TiO2and WO3/TiO2supported on zeolite faujasite
AU - González Rodríguez, Luis Mario
AU - Pinedo Escobar, José Alfonso
AU - Piedra López, Jessica Guadalupe
AU - De Haro Del Rio, David Alejandro
AU - Suarez Vázquez, Santiago Ivan
AU - Carrillo Martínez, Cristina Jared
AU - Solis, Christian Gomez
AU - Chulim, Alvaro Can
N1 - Publisher Copyright:
© 2020 Walter de Gruyter GmbH, Berlin/Boston 2020.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - The present investigation is focused on the preparation, characterization, and photocatalytic activity evaluation of TiO2/zeolite, WO3/zeolite, WO3/TiO2/zeolite, and WO3/TiO2 composites. Zeolite fujasite (FAU) was synthesized by the hydrothermal method, while the semiconductor/zeolite composites by a straightforward physical mixture and calcination treatment. The photocatalytic activity of the materials was evaluated through the methyl orange (MO) degradation under near-UV irradiation (365 nm). The photocatalysts were characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), Energy-dispersive X-ray Spectroscopy (EDX), UV-vis diffuse reflectance spectroscopy and nitrogen physisorption. Results indicated that TiO2, WO3, and Zeolite Y kept their crystalline phases after the preparation method. TiO2 and WO3 particles were distributed on zeolite surface. Also, no significant changes in the band gap energies of the photocatalysts were found. The surface area of zeolite FAU decreased with the addition of TiO2 and WO3. The best MO degradation under near-UV irradiation was obtained with WO3/TiO2 heterojunction and TiO2 P25, no synergistic effect was found between semiconductors and zeolite FAU. Additionally, the kinetic data of the photocatalytic elimination of MO with all photocatalysts under near-UV radiation was investigated with several models: Zero-order, First-Order, Second Order, Modified Freundlich and Parabolic Diffusion, they were consistent with Modified Freundlich model. The effect of initial pH and photocatalyst weight was explored for TiO2/Zeolite composite and it was found that the best MO degradation was obtained at natural pH of 10.3 and 0.2 g of composite was the optimal amount of photocatalyst. Finally, the positive hole formation in all photocatalysts was detected by UV-vis spectroscopy and it was discovered that the highest density of positive holes was obtained with TiO2/zeolite composite.
AB - The present investigation is focused on the preparation, characterization, and photocatalytic activity evaluation of TiO2/zeolite, WO3/zeolite, WO3/TiO2/zeolite, and WO3/TiO2 composites. Zeolite fujasite (FAU) was synthesized by the hydrothermal method, while the semiconductor/zeolite composites by a straightforward physical mixture and calcination treatment. The photocatalytic activity of the materials was evaluated through the methyl orange (MO) degradation under near-UV irradiation (365 nm). The photocatalysts were characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), Energy-dispersive X-ray Spectroscopy (EDX), UV-vis diffuse reflectance spectroscopy and nitrogen physisorption. Results indicated that TiO2, WO3, and Zeolite Y kept their crystalline phases after the preparation method. TiO2 and WO3 particles were distributed on zeolite surface. Also, no significant changes in the band gap energies of the photocatalysts were found. The surface area of zeolite FAU decreased with the addition of TiO2 and WO3. The best MO degradation under near-UV irradiation was obtained with WO3/TiO2 heterojunction and TiO2 P25, no synergistic effect was found between semiconductors and zeolite FAU. Additionally, the kinetic data of the photocatalytic elimination of MO with all photocatalysts under near-UV radiation was investigated with several models: Zero-order, First-Order, Second Order, Modified Freundlich and Parabolic Diffusion, they were consistent with Modified Freundlich model. The effect of initial pH and photocatalyst weight was explored for TiO2/Zeolite composite and it was found that the best MO degradation was obtained at natural pH of 10.3 and 0.2 g of composite was the optimal amount of photocatalyst. Finally, the positive hole formation in all photocatalysts was detected by UV-vis spectroscopy and it was discovered that the highest density of positive holes was obtained with TiO2/zeolite composite.
KW - photocatalytic activity
KW - semiconductor/zeolite
KW - zeolite faujasite
UR - http://www.scopus.com/inward/record.url?scp=85095579056&partnerID=8YFLogxK
U2 - 10.1515/ijcre-2020-0095
DO - 10.1515/ijcre-2020-0095
M3 - Artículo
AN - SCOPUS:85095579056
SN - 2194-5748
VL - 18
JO - International Journal of Chemical Reactor Engineering
JF - International Journal of Chemical Reactor Engineering
IS - 10-11
M1 - 20200095
ER -