Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts

In this study, silver doped zinc oxide and undoped zinc oxide photocatalysts were synthesized through precipitation-irradiation method. In order to evaluate the effect of irradiation time during synthesis, the photocatalysts were prepared at different irradiation duration of 12, 24 and 48 hours. The...

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Main Author:	Rasouli, Elisa
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Photocatalysis Zinc oxide
Online Access:	http://psasir.upm.edu.my/id/eprint/66686/1/FS%202014%2055%20IR.pdf
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spelling	my-upm-ir.666862019-01-31T00:43:20Z Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts 2014-11 Rasouli, Elisa In this study, silver doped zinc oxide and undoped zinc oxide photocatalysts were synthesized through precipitation-irradiation method. In order to evaluate the effect of irradiation time during synthesis, the photocatalysts were prepared at different irradiation duration of 12, 24 and 48 hours. The effect of Ag on the properties and photocatalytic performance of ZnO was also evaluated by preparing Ag-doped ZnO catalyst with different silver loading from 1 to 3 wt%. The resulting catalysts were characterized by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), Total surface Area Measurement (BET Method) and Band Gap Measurement. XRD patterns showed hexagonal structure of zinc oxide. FESEM results confirmed hexagonal structure of zinc oxide and also showed flake morphology with increasing irradiation time. However, both FESEM and TEM images showed high agglomerated particles but it should be noticed that agglomeration decreased with increasing irradiation time. In addition, increasing silver percentage doped on zinc oxide decreased the flake morphology and led to more agglomerated particles. The surface area of ZnO decreases with increasing irradiation time and with addition of Ag. The band gap energy of the ZnO remained constant with increasing radiation time but increased with the addition of 2 wt. % Ag. Due to high agglomeration, measurement of photocatalysts particle size was not conducted. The efficiency of produced ZnO and Ag doped ZnO was examined for degradation of Methyl orange as a model of pollutant under UV-irradiation. Influence of different parameters on degradation performance of Methyl orange such as mass of catalyst, initial concentration of dye, and initial pH were tested. The results showed that the efficiency of catalyst decreased with increasing irradiation time. It was observed that the removal percentage of dye increased with increasing silver loading on zinc oxide and the mass of catalysts up to an optimum amount. Furthermore, the maximum removal percentage was achieved at pH 5. In conclusion, the highest photodegradation activity of 81% of 10 ppm MO was achieved using 0.8 g of 2% Ag/ZnO catalyst at pH 5. Photocatalysis Zinc oxide 2014-11 Thesis http://psasir.upm.edu.my/id/eprint/66686/ http://psasir.upm.edu.my/id/eprint/66686/1/FS%202014%2055%20IR.pdf text en public masters Universiti Putra Malaysia Photocatalysis Zinc oxide
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Photocatalysis Zinc oxide
spellingShingle	Photocatalysis Zinc oxide Rasouli, Elisa Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
description	In this study, silver doped zinc oxide and undoped zinc oxide photocatalysts were synthesized through precipitation-irradiation method. In order to evaluate the effect of irradiation time during synthesis, the photocatalysts were prepared at different irradiation duration of 12, 24 and 48 hours. The effect of Ag on the properties and photocatalytic performance of ZnO was also evaluated by preparing Ag-doped ZnO catalyst with different silver loading from 1 to 3 wt%. The resulting catalysts were characterized by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), Total surface Area Measurement (BET Method) and Band Gap Measurement. XRD patterns showed hexagonal structure of zinc oxide. FESEM results confirmed hexagonal structure of zinc oxide and also showed flake morphology with increasing irradiation time. However, both FESEM and TEM images showed high agglomerated particles but it should be noticed that agglomeration decreased with increasing irradiation time. In addition, increasing silver percentage doped on zinc oxide decreased the flake morphology and led to more agglomerated particles. The surface area of ZnO decreases with increasing irradiation time and with addition of Ag. The band gap energy of the ZnO remained constant with increasing radiation time but increased with the addition of 2 wt. % Ag. Due to high agglomeration, measurement of photocatalysts particle size was not conducted. The efficiency of produced ZnO and Ag doped ZnO was examined for degradation of Methyl orange as a model of pollutant under UV-irradiation. Influence of different parameters on degradation performance of Methyl orange such as mass of catalyst, initial concentration of dye, and initial pH were tested. The results showed that the efficiency of catalyst decreased with increasing irradiation time. It was observed that the removal percentage of dye increased with increasing silver loading on zinc oxide and the mass of catalysts up to an optimum amount. Furthermore, the maximum removal percentage was achieved at pH 5. In conclusion, the highest photodegradation activity of 81% of 10 ppm MO was achieved using 0.8 g of 2% Ag/ZnO catalyst at pH 5.
format	Thesis
qualification_level	Master's degree
author	Rasouli, Elisa
author_facet	Rasouli, Elisa
author_sort	Rasouli, Elisa
title	Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
title_short	Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
title_full	Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
title_fullStr	Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
title_full_unstemmed	Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
title_sort	preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts
granting_institution	Universiti Putra Malaysia
publishDate	2014
url	http://psasir.upm.edu.my/id/eprint/66686/1/FS%202014%2055%20IR.pdf
_version_	1747812396878004224

Preparation, characterization and photocatalytic activity of silver doped zinc oxide photocatalysts

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