Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species

This study focuses on the synthesis, characterization and photocatalytic activity of TiOrSi02 in the presence of Reactive Chlorine Species (RCS). In this system, both Reactive Oxygen Species (ROS) (i.e. ·OH and ·0>) and RCS such as ·Cl, ·CIO and ·ClE work together in degradation of Methylene Blue...

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Main Author:	Elilarasi Letshmanan
Format:	Thesis
Language:	English English
Published:	2020
Subjects:	QD241-441 Organic chemistry
Online Access:	https://eprints.ums.edu.my/id/eprint/42285/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/42285/2/FULLTEXT.pdf
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spelling	my-ums-ep.422852024-12-16T04:13:06Z Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species 2020 Elilarasi Letshmanan QD241-441 Organic chemistry This study focuses on the synthesis, characterization and photocatalytic activity of TiOrSi02 in the presence of Reactive Chlorine Species (RCS). In this system, both Reactive Oxygen Species (ROS) (i.e. ·OH and ·0>) and RCS such as ·Cl, ·CIO and ·ClE work together in degradation of Methylene Blue (MB) dye. The sol gel method was employed to synthesize the TiOrSi02 composite. Instrumentations such as Xray diffraction (XRD), Fourier transform infrared (FTIR), UV-Vis diffuse reflectance (UV-Vis DRS) and Photoluminescence spectrophotometer (PL) were employed to study the characterization of the prepared photocatalyst. In addition, both parametric and kinetic studies were conducted to study the photodegradation of MB by the Ti0-SiO> in the presence of RCS. Parameters such as the influence of initial pH of solution, initial concentration of MB and dosage of photocatalyst on photo degradation of MB were investigated and discussed. Experimental results confirmed that the UV-treated TiOrSi02 achieved the highest removal efficiency, 60% of removal efficiency of MB (6 ppm) in the presence of RCS under solar irradiation, in comparison to Ti0,-Si0> (38% of removal efficiency) and the commercial Degussa P-25 (27% of removal efficiency). The UV-treated Ti0-SiO> exhibited highest removal efficiency, 93% of removal efficiency, at acidic condition compared to neutral which exhibited 61 % of removal efficiency and alkaline conditions with 69% of removal efficiency. It was found that in this photocatalytic system, the RCS contributed the most in the degradation of MB under solar irradiation. The results showed that the UV-treated TiOrSi02 had faster photocatalytic reaction due to its enhanced specific surface area, crystallinity, surface hydroxyl and enhanced efficient usage of photogenerated holes and electrons. The visible light induced photodegradation of MB by the prepared Ti0-SiO> in the presence of RCS were analyzed based on the first order kinetic rate model and it was found that the attained experimental data obeyed the first order kinetic model. 2020 Thesis https://eprints.ums.edu.my/id/eprint/42285/ https://eprints.ums.edu.my/id/eprint/42285/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/42285/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah Fakulti Sains dan Sumber Alam
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	QD241-441 Organic chemistry
spellingShingle	QD241-441 Organic chemistry Elilarasi Letshmanan Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
description	This study focuses on the synthesis, characterization and photocatalytic activity of TiOrSi02 in the presence of Reactive Chlorine Species (RCS). In this system, both Reactive Oxygen Species (ROS) (i.e. ·OH and ·0>) and RCS such as ·Cl, ·CIO and ·ClE work together in degradation of Methylene Blue (MB) dye. The sol gel method was employed to synthesize the TiOrSi02 composite. Instrumentations such as Xray diffraction (XRD), Fourier transform infrared (FTIR), UV-Vis diffuse reflectance (UV-Vis DRS) and Photoluminescence spectrophotometer (PL) were employed to study the characterization of the prepared photocatalyst. In addition, both parametric and kinetic studies were conducted to study the photodegradation of MB by the Ti0-SiO> in the presence of RCS. Parameters such as the influence of initial pH of solution, initial concentration of MB and dosage of photocatalyst on photo degradation of MB were investigated and discussed. Experimental results confirmed that the UV-treated TiOrSi02 achieved the highest removal efficiency, 60% of removal efficiency of MB (6 ppm) in the presence of RCS under solar irradiation, in comparison to Ti0,-Si0> (38% of removal efficiency) and the commercial Degussa P-25 (27% of removal efficiency). The UV-treated Ti0-SiO> exhibited highest removal efficiency, 93% of removal efficiency, at acidic condition compared to neutral which exhibited 61 % of removal efficiency and alkaline conditions with 69% of removal efficiency. It was found that in this photocatalytic system, the RCS contributed the most in the degradation of MB under solar irradiation. The results showed that the UV-treated TiOrSi02 had faster photocatalytic reaction due to its enhanced specific surface area, crystallinity, surface hydroxyl and enhanced efficient usage of photogenerated holes and electrons. The visible light induced photodegradation of MB by the prepared Ti0-SiO> in the presence of RCS were analyzed based on the first order kinetic rate model and it was found that the attained experimental data obeyed the first order kinetic model.
format	Thesis
qualification_level	Master's degree
author	Elilarasi Letshmanan
author_facet	Elilarasi Letshmanan
author_sort	Elilarasi Letshmanan
title	Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
title_short	Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
title_full	Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
title_fullStr	Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
title_full_unstemmed	Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
title_sort	synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species
granting_institution	Universiti Malaysia Sabah
granting_department	Fakulti Sains dan Sumber Alam
publishDate	2020
url	https://eprints.ums.edu.my/id/eprint/42285/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/42285/2/FULLTEXT.pdf
_version_	1818611456676986880

Synthesis, characterization and photocatalytic activity of tio2,sio2 photocatalyst in the presence of reative chlorine species

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