Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue

In recent times, industrial dye effluent has produced adverse effects towards human health and the environment, majorly due to its high level of toxicity. Among the various techniques for treatment of the dye effluents, photocatalytic decolourization proves to be highly promising owing to its safety...

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Main Author:	Mustapha, Fatin Hazira
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/78007/1/FatinHaziraMustaphaMFChE2017.pdf
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spelling	my-utm-ep.780072018-07-23T06:05:17Z Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue 2017-08 Mustapha, Fatin Hazira TP Chemical technology In recent times, industrial dye effluent has produced adverse effects towards human health and the environment, majorly due to its high level of toxicity. Among the various techniques for treatment of the dye effluents, photocatalytic decolourization proves to be highly promising owing to its safety, low energy consumption and high efficiency. Titanium dioxide (TiO2) is the most well-known photocatalyst. However, due to its large band-gap and agglomeration tendency, a lot of researches such as modification of its morphology have been reported in attempt to resolve this problem. In this study, the flower-like titanium dioxide nanoparticle (FTN) photocatalyst was prepared under different concentrations (2M-4M) of hydrochloric acid (HCl) via hydrothermal method and subsequently tested for decolourization of methylene blue (MB). The properties of the catalysts were characterized using x-ray diffraction, field emission scanning electron microscope, Fourier transform infrared, electron spin resonance, ultraviolet-visible spectrophotometer diffuse reflectance spectroscopy and nitrogen adsorption-desorption. The increase in HCl concentration was observed to result in more enhancement of the pure crystalline rutile TiO2 with the more open structure of its individual nanospindle. The highest distribution of hydroxyl group, oxygen vacancy and Ti3+ surface defect was observed for the catalyst synthesized using 3M HCl concentration, thereby increasing its potential use in visible light irradiation. The photocatalytic activity of the catalysts towards decolourization of 10 mg L-1 MB at pH 11 with 0.25 g L-1 catalyst after 1 hour 30 minute under visible light irradiation was in the following order: FTN-3M (98%) > FTN-4M (92%) > FTN-2M (86%). The kinetics study specified that decolourization of MB followed the pseudo first order Langmuir-Hinshelwood model. The regeneration study showed that the catalyst remained stable after 5 cycles. Lastly, the synthesized catalyst has displayed remarkable performance (above 80%) in decolourization of simulated dyes which consist of rhodamine B, MB, methyl orange and congo red, and has potential use as catalyst for wastewater treatment in textile industry 2017-08 Thesis http://eprints.utm.my/id/eprint/78007/ http://eprints.utm.my/id/eprint/78007/1/FatinHaziraMustaphaMFChE2017.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:105172 masters Universiti Teknologi Malaysia, Faculty of Chemical Engineering Faculty of Chemical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Mustapha, Fatin Hazira Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
description	In recent times, industrial dye effluent has produced adverse effects towards human health and the environment, majorly due to its high level of toxicity. Among the various techniques for treatment of the dye effluents, photocatalytic decolourization proves to be highly promising owing to its safety, low energy consumption and high efficiency. Titanium dioxide (TiO2) is the most well-known photocatalyst. However, due to its large band-gap and agglomeration tendency, a lot of researches such as modification of its morphology have been reported in attempt to resolve this problem. In this study, the flower-like titanium dioxide nanoparticle (FTN) photocatalyst was prepared under different concentrations (2M-4M) of hydrochloric acid (HCl) via hydrothermal method and subsequently tested for decolourization of methylene blue (MB). The properties of the catalysts were characterized using x-ray diffraction, field emission scanning electron microscope, Fourier transform infrared, electron spin resonance, ultraviolet-visible spectrophotometer diffuse reflectance spectroscopy and nitrogen adsorption-desorption. The increase in HCl concentration was observed to result in more enhancement of the pure crystalline rutile TiO2 with the more open structure of its individual nanospindle. The highest distribution of hydroxyl group, oxygen vacancy and Ti3+ surface defect was observed for the catalyst synthesized using 3M HCl concentration, thereby increasing its potential use in visible light irradiation. The photocatalytic activity of the catalysts towards decolourization of 10 mg L-1 MB at pH 11 with 0.25 g L-1 catalyst after 1 hour 30 minute under visible light irradiation was in the following order: FTN-3M (98%) > FTN-4M (92%) > FTN-2M (86%). The kinetics study specified that decolourization of MB followed the pseudo first order Langmuir-Hinshelwood model. The regeneration study showed that the catalyst remained stable after 5 cycles. Lastly, the synthesized catalyst has displayed remarkable performance (above 80%) in decolourization of simulated dyes which consist of rhodamine B, MB, methyl orange and congo red, and has potential use as catalyst for wastewater treatment in textile industry
format	Thesis
qualification_level	Master's degree
author	Mustapha, Fatin Hazira
author_facet	Mustapha, Fatin Hazira
author_sort	Mustapha, Fatin Hazira
title	Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
title_short	Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
title_full	Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
title_fullStr	Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
title_full_unstemmed	Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
title_sort	synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical Engineering
granting_department	Faculty of Chemical Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/78007/1/FatinHaziraMustaphaMFChE2017.pdf
_version_	1747817884491448320

Synthesis of flower-like titania nanoparticles for photocatalytic decolourization of methylene blue

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