Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method

Preparation of photocatalysts of TiO2 and Ag-TiO2 was carried out by coprecipitation method. The prepared photocatalysts were characterized by X-ray diffraction (XRD), SEM, EDX, and XRF analysis. The disinfection of E. coli, a model indicator organism for the safe water supply, was investigated by u...

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Main Authors: Robert Liu, H. S. Wu, Ruth Yeh, C. Y. Lee, Yungtse Hung
Format: Article
Language:English
Published: Wiley 2012-01-01
Series:International Journal of Photoenergy
Online Access:http://dx.doi.org/10.1155/2012/640487
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author Robert Liu
H. S. Wu
Ruth Yeh
C. Y. Lee
Yungtse Hung
author_facet Robert Liu
H. S. Wu
Ruth Yeh
C. Y. Lee
Yungtse Hung
author_sort Robert Liu
collection DOAJ
description Preparation of photocatalysts of TiO2 and Ag-TiO2 was carried out by coprecipitation method. The prepared photocatalysts were characterized by X-ray diffraction (XRD), SEM, EDX, and XRF analysis. The disinfection of E. coli, a model indicator organism for the safe water supply, was investigated by using TiO2 and Ag-TiO2 under different light sources. The treatment efficacy for the inactivation of E. coli would be UV/Ag-TiO2; visible/Ag-TiO2; dark/Ag-TiO2; UV (all 100%) > UV/TiO2 (99%) > visible/TiO2 (96%) > dark/TiO2 (87%) > visible (23%) > dark (19%). The order of disinfection efficiency by their corresponding kinetic initial apparent rate constants, 𝑘app, (min−1) would be UV/Ag-TiO2; visible/Ag-TiO2 (both 6.67) > UV (6.6) > dark/Ag-TiO2 (6.56) > UV/TiO2 (1.62) > visible/TiO2 (1.08) > dark/TiO2 (0.7) > visible (0.28) > dark (0.03). The application of TiO2 doped with silver strongly improved the ability of disinfection treatment. The study of mineralization of E. coli by measurement of TOC (total organic carbon) removal percentage showed that the visible light may effectively be applied for the disinfection unit of water and wastewater treatment system by using photocatalysts of Ag-TiO2.
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spelling doaj-art-9271fbffe14843e1b0b45fc3253a620b2025-02-03T07:25:50ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2012-01-01201210.1155/2012/640487640487Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation MethodRobert Liu0H. S. Wu1Ruth Yeh2C. Y. Lee3Yungtse Hung4Department of Chemical and Materials Engineering, Minghsin University of Science and Technology, Hsinchu 30401, TaiwanDepartment of Chemical and Materials Engineering, Minghsin University of Science and Technology, Hsinchu 30401, TaiwanDepartment of Chemical and Materials Engineering, Minghsin University of Science and Technology, Hsinchu 30401, TaiwanDepartment of Chemical and Materials Engineering, Minghsin University of Science and Technology, Hsinchu 30401, TaiwanDepartment of Civil and Environmental Engineering, Cleveland State University, Cleveland, OH 44115-2214, USAPreparation of photocatalysts of TiO2 and Ag-TiO2 was carried out by coprecipitation method. The prepared photocatalysts were characterized by X-ray diffraction (XRD), SEM, EDX, and XRF analysis. The disinfection of E. coli, a model indicator organism for the safe water supply, was investigated by using TiO2 and Ag-TiO2 under different light sources. The treatment efficacy for the inactivation of E. coli would be UV/Ag-TiO2; visible/Ag-TiO2; dark/Ag-TiO2; UV (all 100%) > UV/TiO2 (99%) > visible/TiO2 (96%) > dark/TiO2 (87%) > visible (23%) > dark (19%). The order of disinfection efficiency by their corresponding kinetic initial apparent rate constants, 𝑘app, (min−1) would be UV/Ag-TiO2; visible/Ag-TiO2 (both 6.67) > UV (6.6) > dark/Ag-TiO2 (6.56) > UV/TiO2 (1.62) > visible/TiO2 (1.08) > dark/TiO2 (0.7) > visible (0.28) > dark (0.03). The application of TiO2 doped with silver strongly improved the ability of disinfection treatment. The study of mineralization of E. coli by measurement of TOC (total organic carbon) removal percentage showed that the visible light may effectively be applied for the disinfection unit of water and wastewater treatment system by using photocatalysts of Ag-TiO2.http://dx.doi.org/10.1155/2012/640487
spellingShingle Robert Liu
H. S. Wu
Ruth Yeh
C. Y. Lee
Yungtse Hung
Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
International Journal of Photoenergy
title Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
title_full Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
title_fullStr Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
title_full_unstemmed Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
title_short Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
title_sort synthesis and bactericidal ability of tio2 and ag tio2 prepared by coprecipitation method
url http://dx.doi.org/10.1155/2012/640487
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