Wong Man Yung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (leaves 106-120). / Abstracts in English and Chinese. / Acknowledgements --- p.i / Abstract --- p.ii / Table of Contents --- p.vi / List of Figures --- p.xi / List of Plates --- p.xiii / List of Tables --- p.xv / Abbreviations --- p.xvi / Equations --- p.xviii / Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Water disinfection --- p.1 / Chapter 1.2 --- Bacterial species --- p.2 / Chapter 1.2.1 --- Staphylococcus saprophyticus --- p.2 / Chapter 1.2.2 --- Enterobacter cloacae --- p.3 / Chapter 1.3 --- Disinfection methods --- p.4 / Chapter 1.3.1 --- Physical methods --- p.4 / Chapter 1.3.1.1 --- UV-C irradiation --- p.4 / Chapter 1.3.1.2 --- Solar disinfection --- p.5 / Chapter 1.3.2 --- Chemical methods --- p.6 / Chapter 1.3.2.1 --- Chlorination --- p.6 / Chapter 1.3.2.2 --- Ozonation --- p.7 / Chapter 1.3.2.3 --- Mixed disinfectants --- p.8 / Chapter 1.3.3 --- Other disinfection methods --- p.8 / Chapter 1.4 --- Advanced oxidation processes (AOPs) --- p.9 / Chapter 1.5 --- Photocatalytic oxidation (PCO) --- p.10 / Chapter 1.5.1 --- PCO process --- p.12 / Chapter 1.5.2 --- Photocatalysts --- p.14 / Chapter 1.5.2.1 --- Titanium dioxide (P25) --- p.15 / Chapter 1.5.2.2 --- Silver sensitized P25 (Ag/P25) --- p.16 / Chapter 1.5.2.3 --- Silicon dioxide doped titanium dioxide (SiO2-TiO2) --- p.17 / Chapter 1.5.2.4 --- Copper(I) oxide sensitized P25 (Cu2O/P25) --- p.18 / Chapter 1.5.3 --- Irradiation sources --- p.19 / Chapter 1.5.4 --- PCO disinfection mechanisms --- p.20 / Chapter 1.6 --- Bacterial defense mechanisms against oxidative stress --- p.22 / Chapter 2. --- Objectives --- p.25 / Chapter 3. --- Materials and Methods --- p.26 / Chapter 3.1 --- Chemicals --- p.26 / Chapter 3.2 --- Bacterial culture --- p.26 / Chapter 3.3 --- Photocatalytic reactor --- p.27 / Chapter 3.4 --- PCO efficacy test --- p.30 / Chapter 3.5 --- Optimization of PCO conditions --- p.31 / Chapter 3.5.1 --- Effect of P25 concentrations --- p.31 / Chapter 3.5.2 --- Effect of UV intensities --- p.32 / Chapter 3.5.3 --- Combinational study of P25 concentrations and UV intensities --- p.32 / Chapter 3.5.4 --- Effect of stirring rates --- p.32 / Chapter 3.5.5 --- Effect of initial cell concentrations --- p.33 / Chapter 3.6 --- PCO disinfection using different photocatalysts --- p.33 / Chapter 3.6.1 --- Effect of CU2O/P25 concentrations --- p.33 / Chapter 3.6.2 --- Effect of CU2O powder on the two bacterial species --- p.33 / Chapter 3.7 --- Transmission electron microscopy (TEM) --- p.34 / Chapter 3.8 --- Catalase (CAT) test --- p.37 / Chapter 3.9 --- Superoxide dismutase (SOD) activity assay --- p.39 / Chapter 4. --- Results --- p.40 / Chapter 4.1 --- Efficacy test --- p.40 / Chapter 4.2 --- PCO disinfection under UV irradiation --- p.40 / Chapter 4.2.1 --- Control experiments --- p.40 / Chapter 4.2.2 --- Optimization of PCO conditions using P25 as a photocatalyst --- p.42 / Chapter 4.2.2.1 --- Effect of P25 concentrations --- p.42 / Chapter 4.2.2.2 --- Effect of UV intensities --- p.45 / Chapter 4.2.2.3 --- Combinational study of P25 concentrations and UV intensities --- p.48 / Chapter 4.2.2.4 --- Effect of stirring rates --- p.54 / Chapter 4.2.2.5 --- Effect of initial cell concentrations --- p.57 / Chapter 4.2.3 --- Comparison of PCO inactivation efficiency between S. saprophyticus and E. cloacae --- p.60 / Chapter 4.2.4 --- PCO disinfection using different photocatalysts --- p.62 / Chapter 4.2.4.1 --- Control experiments --- p.62 / Chapter 4.2.4.2 --- Ag/P25 --- p.62 / Chapter 4.2.4.3 --- SiO2-TiO2 --- p.64 / Chapter 4.2.4.4 --- Cu2O/P25 --- p.64 / Chapter 4.3 --- PCO disinfection under visible light irradiation --- p.66 / Chapter 4.3.1 --- Effect of Cu2O/P25 concentrations --- p.67 / Chapter 4.3.2 --- Effect of CU2O powder on the two bacterial species --- p.70 / Chapter 4.4 --- Feasibility use of indoor light (fluorescent lamps) for PCO disinfection --- p.71 / Chapter 4.5 --- Transmission electron microscopy (TEM) --- p.74 / Chapter 4.5.1 --- Morphological changes induced by PCO using P25 as a photocatalyst --- p.74 / Chapter 4.5.2 --- Morphological changes induced by PCO using Cu2O/P25 as a photocatalyst --- p.77 / Chapter 4.6 --- Catalase (CAT) test --- p.80 / Chapter 4.7 --- Superoxide dismutase (SOD) activity assay --- p.82 / Chapter 5. --- Discussion --- p.83 / Chapter 5.1 --- Efficacy test --- p.83 / Chapter 5.2 --- PCO disinfection under UV irradiation --- p.83 / Chapter 5.2.1 --- Optimization study --- p.84 / Chapter 5.2.1.1 --- Effect of P25 concentrations --- p.84 / Chapter 5.2.1.2 --- Effect of UV intensities --- p.85 / Chapter 5.2.1.3 --- Combinational study of P25 concentrations and UV intensities --- p.86 / Chapter 5.2.1.4 --- Effect of stirring rates --- p.86 / Chapter 5.2.1.5 --- Effect of initial cell concentrations --- p.87 / Chapter 5.2.2 --- Comparison of PCO inactivation efficiency between S. saprophyticus and E. cloacae --- p.88 / Chapter 5.2.3 --- PCO disinfection using different photocatalysts --- p.89 / Chapter 5.2.3.1 --- Ag/P25 --- p.89 / Chapter 5.2.3.2 --- SiO2-TiO2 and Cu2O/P25 --- p.90 / Chapter 5.3 --- PCO disinfection under visible light irradiation --- p.90 / Chapter 5.3.1 --- Effect of Cu20/P25 concentrations --- p.91 / Chapter 5.3.2 --- Effect of CU2O powder on the two bacterial species --- p.92 / Chapter 5.4 --- Feasibility use of fluorescent lamps for PCO disinfection --- p.93 / Chapter 5.5 --- Transmission electron microscopy (TEM) --- p.95 / Chapter 5.5.1 --- Morphological changes induced by PCO using P25 as a photocatalyst --- p.95 / Chapter 5.5.2 --- Morphological changes induced by PCO using CU2O/P25 as a photocatalyst --- p.96 / Chapter 5.6 --- Catalase (CAT) test --- p.98 / Chapter 5.7 --- Superoxide dismutase (SOD) activity assay --- p.99 / Chapter 6. --- Conclusion --- p.101 / Chapter 7. --- References --- p.106 / Chapter 8. --- Appendix --- p.121
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_325740 |
| Date | January 2006 |
| Contributors | Wong, Man Yung., Chinese University of Hong Kong Graduate School. Division of Biology. |
| Source Sets | The Chinese University of Hong Kong |
| Language | English, Chinese |
| Detected Language | English |
| Type | Text, bibliography |
| Format | print, xviii, 121 leaves : ill. (some col.) ; 30 cm. |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
Page generated in 0.004 seconds