Hassan, N. S. and Jalil, A. A. and Aziz, F. F. A. and Aziz, M. A. H. and Hussain, I. and Aliab, M. W. (2021) New insight into sequential of silica-zirconia precursors in stabilizing silica-doped tetragonal zirconia nanoparticles for enhanced photoactivity. Materials Letters, 291 . p. 129582. ISSN 0167-577X
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Official URL: http://dx.doi.org/10.1016/j.matlet.2021.129582
Abstract
Silica-doped tetragonal zirconia nanoparticles (SiO2-ZrO2) catalysts were synthesized with the addition of ZrO2 prior to SiO2 by the microwave-assisted method and compared with a different sequence of ZrO2 and SiO2 (ZrO2-SiO2). The catalysts were characterized by X-ray diffraction, nitrogen adsorption-desorption, transmission electron microscopy, Fourier-transform infrared, electron spin resonance, ultraviolet–visible diffuse reflectance spectroscopy and photoluminescence analyses. The catalyst phase was pure tetragonal ZrO2 (t-ZrO2) with nano in size (9–10 nm). The sequential of SiO2 and ZrO2 precursors significantly affected the catalyst framework and led to a different number of pore volume and defect sites, including oxygen vacancies (OV), metal defects site (MDS) and Si-O-Zr bonds, which altered their behaviour towards t-ZrO2 stabilization and applications. It was found that the synergistic effect between nanocrystals and the appropriate amount of defect sites influenced the stabilization of t-ZrO2. The catalytic activity towards photodegradation of 2-chlorophenol (2-CP) are in the following order: SiO2-ZrO2 (92%) > ZrO2-SiO2 (59%) > ZrO2 (50%) > SiO2 (20%). The highest photoactivity of SiO2-ZrO2 is due to the large pore volume, which offered good surface contact with light. Besides, the higher crystallinity, Si-O-Zr bonds, and OV and MDS also could contribute to the excellent performance in 2-CP degradation. The abovementioned properties provided good electron-hole pair mobility and electron trapping for enhanced photoactivity.
Item Type: | Article |
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Uncontrolled Keywords: | Defect sites, Nanocrystal |
Subjects: | T Technology > TP Chemical technology |
Divisions: | Chemical and Energy Engineering |
ID Code: | 95115 |
Deposited By: | Widya Wahid |
Deposited On: | 29 Apr 2022 22:24 |
Last Modified: | 29 Apr 2022 22:24 |
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