Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay

TiO2 nanostructures is one of the promising metal oxide semiconductors which has been used in many applications such as solar cells, sensors, photocatalysts, and even for medicines. Photocatalysis using nano-TiO2 is an excellent approach in overcoming the water pollution problems. However, there are...

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Main Author:	Safiay, Nur Munirah
Format:	Thesis
Language:	English
Published:	2021
Subjects:	Atomic physics Constitution and properties of matter Nanostructures Elementary particle physics
Online Access:	https://ir.uitm.edu.my/id/eprint/46553/1/46553.pdf
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spelling	my-uitm-ir.465532023-04-03T03:25:36Z Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay 2021 Safiay, Nur Munirah Atomic physics. Constitution and properties of matter Nanostructures Elementary particle physics TiO2 nanostructures is one of the promising metal oxide semiconductors which has been used in many applications such as solar cells, sensors, photocatalysts, and even for medicines. Photocatalysis using nano-TiO2 is an excellent approach in overcoming the water pollution problems. However, there are some issues regarding TiO2 shortcomings in photocatalysis such as leaving behind residual by-products of TiO2 powder suspension that needed an after treatment and limited light absorption in the visible region. Therefore, this current study was performed to synthesize TiO2 photocatalyst on substrates and doping approach with niobium (Nb) was introduced to enhance the crystallinity and optical properties of TiO2. In this work, TiO2 nanoparticulate films have been synthesized on glass substrates at fixed molarity of 0.25 M. In this part, the annealing temperatures and coating cycles were varied from 400-600 °C and 1-9 cycles, respectively. Further, TiO2 were doped with Nb where the dopant concentrations were manipulated from 0 (undoped) to 9 at.% and the annealing temperatures were varied from 400-600 °C. Photocatalytic behaviour Nb-doped TiO2 nanoparticulate films for the photodegradation of Methylene Blue (MB) were also investigated. The structural, morphological and optical properties of the synthesized films were characterized via Field-Emission Scanning Electron Microscope (FESEM), X-ray diffraction (XRD) and ultraviolet-visible spectrophotometry (UV-Vis), respectively. The photocatalytic behavior of Nb-doped TiO2 nanoparticulate films was also measured by using UV-Vis. Results show that the optimization of pristine TiO2 nanoparticulate films at different annealing temperatures exhibited that the film annealed at 500 °C have the most uniform morphology, highly crystalline and has the highest absorptivity at 3.6 × 107 m-1 than the other samples. Meanwhile, the optimum coating cycles was 7 cycles owing to the film has the smallest nanoparticles size, smallest crystallite size at 13.4 nm and highest absorption at 3.7 × 107 m-1. Nb-doped TiO2 nanoparticulate films were synthesized and their photocatalytic behavior was investigated at 5 ppm of MB concentration and neutral pH. 5 at.% of Nb-doped TiO2 shows the highest absorption at 3.2 × 107 m-1 and the degradation of MB was also the highest at 95.9 % compared to the pristine TiO2 film which only degraded up to 53.4 %. The optimized annealing temperature for Nb-doped TiO2 nanoparticulate films was found to be at 550 °C and the percentage degradation of MB was 96.9 %. Further study on the effect of MB concentration and pH were investigated for the optimized Nb-doped TiO2 films. It was found that 5 ppm of initial MB concentration has the highest degradation performance of 90.6 % and the optimum pH of MB was found to be at pH 9 were the percentage degradation was 98.3 %. These remarkable increases in photocatalytic behavior of Nb-doped TiO2 nanoparticulate films were due to the increase in absorption where the absorbance was extended to the longer wavelength. 2021 Thesis https://ir.uitm.edu.my/id/eprint/46553/ https://ir.uitm.edu.my/id/eprint/46553/1/46553.pdf text en public masters Universiti Teknologi MARA Faculty of Applied Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Atomic physics Constitution and properties of matter Nanostructures Elementary particle physics
spellingShingle	Atomic physics Constitution and properties of matter Nanostructures Elementary particle physics Safiay, Nur Munirah Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay
description	TiO2 nanostructures is one of the promising metal oxide semiconductors which has been used in many applications such as solar cells, sensors, photocatalysts, and even for medicines. Photocatalysis using nano-TiO2 is an excellent approach in overcoming the water pollution problems. However, there are some issues regarding TiO2 shortcomings in photocatalysis such as leaving behind residual by-products of TiO2 powder suspension that needed an after treatment and limited light absorption in the visible region. Therefore, this current study was performed to synthesize TiO2 photocatalyst on substrates and doping approach with niobium (Nb) was introduced to enhance the crystallinity and optical properties of TiO2. In this work, TiO2 nanoparticulate films have been synthesized on glass substrates at fixed molarity of 0.25 M. In this part, the annealing temperatures and coating cycles were varied from 400-600 °C and 1-9 cycles, respectively. Further, TiO2 were doped with Nb where the dopant concentrations were manipulated from 0 (undoped) to 9 at.% and the annealing temperatures were varied from 400-600 °C. Photocatalytic behaviour Nb-doped TiO2 nanoparticulate films for the photodegradation of Methylene Blue (MB) were also investigated. The structural, morphological and optical properties of the synthesized films were characterized via Field-Emission Scanning Electron Microscope (FESEM), X-ray diffraction (XRD) and ultraviolet-visible spectrophotometry (UV-Vis), respectively. The photocatalytic behavior of Nb-doped TiO2 nanoparticulate films was also measured by using UV-Vis. Results show that the optimization of pristine TiO2 nanoparticulate films at different annealing temperatures exhibited that the film annealed at 500 °C have the most uniform morphology, highly crystalline and has the highest absorptivity at 3.6 × 107 m-1 than the other samples. Meanwhile, the optimum coating cycles was 7 cycles owing to the film has the smallest nanoparticles size, smallest crystallite size at 13.4 nm and highest absorption at 3.7 × 107 m-1. Nb-doped TiO2 nanoparticulate films were synthesized and their photocatalytic behavior was investigated at 5 ppm of MB concentration and neutral pH. 5 at.% of Nb-doped TiO2 shows the highest absorption at 3.2 × 107 m-1 and the degradation of MB was also the highest at 95.9 % compared to the pristine TiO2 film which only degraded up to 53.4 %. The optimized annealing temperature for Nb-doped TiO2 nanoparticulate films was found to be at 550 °C and the percentage degradation of MB was 96.9 %. Further study on the effect of MB concentration and pH were investigated for the optimized Nb-doped TiO2 films. It was found that 5 ppm of initial MB concentration has the highest degradation performance of 90.6 % and the optimum pH of MB was found to be at pH 9 were the percentage degradation was 98.3 %. These remarkable increases in photocatalytic behavior of Nb-doped TiO2 nanoparticulate films were due to the increase in absorption where the absorbance was extended to the longer wavelength.
format	Thesis
qualification_level	Master's degree
author	Safiay, Nur Munirah
author_facet	Safiay, Nur Munirah
author_sort	Safiay, Nur Munirah
title	Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay
title_short	Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay
title_full	Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay
title_fullStr	Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay
title_full_unstemmed	Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay
title_sort	photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / nur munirah safiay
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2021
url	https://ir.uitm.edu.my/id/eprint/46553/1/46553.pdf
_version_	1783734758478446592

Photocatalytic behaviour of niobium-doped titanium dioxide nanoparticulate films for photodegradation of methylene blue / Nur Munirah Safiay

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