Photocatalytic oxidation of triclosan.

Kwong Tsz Yan Alex.Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.Includes bibliographical references (leaves 77-84).Abstracts in English and Chinese.Abstract --- p.iDeclaration --- p.iiiAcknowledgement --- p.ivTable of contents --- p.vList of tables --- p.ixList of figures --- p.xChapter Chapter One : --- Introduction --- p.1Chapter 1.1 --- The outbreak of SARS --- p.1Chapter 1.2 --- Characteristics of triclosan --- p.2Chapter 1.3 --- Environmental fate of triclosan --- p.3Chapter 1.4 --- Treatment methods for triclosan --- p.5Chapter 1.5 --- Ti02 photocatalysis --- p.6Chapter 1.6 --- Addition of hydrogen peroxide to the photocatalytic system --- p.9Chapter 1.7 --- Gas chromatography/ ion trap mass spectrometry analysis --- p.10Chapter 1.8 --- Scope of work --- p.11Chapter Chapter Two : --- Experimental --- p.13Chapter 2.1 --- Chemical reagents --- p.13Chapter 2.2 --- Photocatalytic experiments --- p.14Chapter 2.3 --- "Analysis of 2,8-DCDD and triclosan by GC/ITMS" --- p.15Chapter 2.4 --- Optimization of GC/ITMS conditions --- p.17Chapter 2.5 --- Analysis of other reaction intermediates by GC/MS (full scan mode) --- p.18Chapter 2.6 --- "Analysis of 2,4-dichlorophenol and triclosan by GC/MS (SIM mode)" --- p.20Chapter 2.7 --- Effect of hydrogen peroxide concentration on triclosan degradation --- p.20Chapter 2.8 --- Determination of total organic carbon (TOC) removal --- p.21Chapter 2.9 --- UV-Visible spectrometry --- p.21Chapter Chapter Three : --- Results --- p.22Chapter 3.1 --- Selection of precursor ions for GC/ITMS analysis --- p.22Chapter 3.2 --- Optimization of GC/ITMS conditions --- p.25Chapter 3.3 --- "Analysis of 2,8-DCDD and triclosan by GC/ITMS" --- p.27Chapter 3.4 --- "Analysis of 2,4-dichlorophenol and triclosan by GC/MS (SIM mode)" --- p.29Chapter 3.5 --- "Quantitative measurement of 2,8-DCDD in UV irradiated samples" --- p.31Chapter 3.6 --- Photocatalytic oxidation of triclosan by UV at 365nm --- p.33Chapter 3.7 --- TOC removal in triclosan degradation --- p.35Chapter 3.8 --- Identification of intermediates in photocatalytic oxidation of triclosan --- p.36Chapter 3.9 --- Quantitative measurement of the intermediates in photocatalytic oxidation of triclosan --- p.41Chapter 3.10 --- Effect of hydrogen peroxide concentration on triclosan degradation --- p.43Chapter 3.11 --- Effect of hydrogen peroxide concentration on TOC removal --- p.46Chapter 3.12 --- "Effect of hydrogen peroxide concentration on 2,4-dichlorophenol generation during triclosan degradation" --- p.47Chapter 3.13 --- "Photocatalytic degradation of 2,4-dichlorophenol" --- p.49Chapter 3.14 --- "Identification of intermediates in photocatalytic oxidation of 2,4-dichlorophenol" --- p.50Chapter 3.15 --- "Quantitative measurement of the intermediates in photocatalytic oxidation of 2,4-dichlorophenol" --- p.54Chapter Chapter Four : --- Discussions --- p.56Chapter 4.1 --- "Photochemical conversion of triclosan to 2,8-DCDD" --- p.56Chapter 4.2 --- Proposed mechanism of triclosan degradation --- p.57Chapter 4.3 --- "Proposed mechanism of 2,4-dichlorophenol degradation" --- p.63Chapter 4.4 --- TOC removal in triclosan degradation --- p.65Chapter 4.5 --- Effect of hydrogen peroxide concentration on photocatalytic oxidation of triclosan --- p.65Chapter 4.6 --- "Adverse environmental and human health effects of 2,8-DCDD" --- p.69Chapter 4.7 --- "Adverse environmental and human health effects of 2,4-dichlorophenol" --- p.71Chapter 4.8 --- "Discharge limitations for 2,4-dichlorophenol" --- p.73Chapter Chapter Five : --- Conclusions --- p.75References --- p.7