Enhancement of photocatalytic activity by doping nitrogen and boron into titanium dioxide.

Leung Cheuk-wan.Thesis (M.Phil.)--Chinese University of Hong Kong, 2006.Includes bibliographical references.Abstracts in English and Chinese.Abstract --- p.iAbstract (Chinese) --- p.iiAcknowledgement --- p.iiiTable of Contents --- p.vLists of Tables --- p.ixLists of Figures --- p.xChapter Chapter 1 --- Introduction --- p.1Chapter 1.1 --- TiO2 Photocatalysis --- p.1Chapter 1.1.1 --- Mechanisms of TiO2 Photocatalysis --- p.1Chapter 1.2 --- Visible Light Photocatalyst --- p.4Chapter 1.2.1 --- Preparation of Visible Light Ti02 Photocatalysts --- p.5Chapter 1.2.1.1 --- Dye Sensitization --- p.5Chapter 1.2.1.2 --- Metal Doping --- p.6Chapter 1.2.1.3 --- Coupling of Semiconductors --- p.6Chapter 1.2.1.4 --- Nonmetal Doping --- p.7Chapter 1.3 --- Enhanced TiO2 Photocatalytic Activity under UV Light --- p.8Chapter 1.3.1 --- Preparation of TiO2 Photocatalyst with Enhanced Activity in UV Light --- p.8Chapter 1.3.1.1 --- Loading of Metal --- p.8Chapter 1.3.1.2 --- Impurity Co-doping --- p.9Chapter 1.3.1.3 --- Morphological Control --- p.10Chapter 1.3.1.4 --- Increasing Surface Area --- p.10Chapter 1.4 --- Summary --- p.11Chapter 1.6 --- Aim of This Research and its Significance --- p.12Chapter 1.7 --- References --- p.13Chapter Chapter 2 --- Preparation of N-doped TiO2 with Enhanced Surface Area: A Detailed Characterization and Mechanism --- p.19Chapter 2.1 --- Introduction --- p.19Chapter 2.2 --- Experimental --- p.21Chapter 2.2.1 --- Materials and Catalyst Preparation --- p.21Chapter 2.2.2 --- Characterization --- p.21Chapter 2.2.3 --- Photocatalytic Activity --- p.23Chapter 2.3 --- Results and Discussion --- p.24Chapter 2.3.1 --- XRD Analysis --- p.24Chapter 2.3.2 --- UV-Vis Absorption Spectroscopy and Bandgap Energies --- p.27Chapter 2.3.3 --- N2 Sorption Analysis --- p.29Chapter 2.3.4 --- SEM Analysis --- p.33Chapter 2.3.5 --- TEM Analysis --- p.35Chapter 2.3.6 --- FT-IR Spectroscopy --- p.36Chapter 2.3.7 --- Raman Spectroscopy --- p.39Chapter 2.3.8 --- XPS Studies --- p.44Chapter 2.3.9 --- PL Measurements --- p.49Chapter 2.3.10 --- Photocatalytic Activity Measurements --- p.50Chapter 2.3.11 --- Advantages of Using Urea as a N-doping Source --- p.54Chapter 2.3.12 --- Mechanisms for N-doping --- p.56Chapter 2.4 --- Conclusions --- p.58Chapter 2.5 --- References --- p.59Chapter Chapter 3 --- Preparation of Nanoporous Interstitial B-doped TiCO2 with Enhanced Photocatalytic Activity --- p.63Chapter 3.1 --- Introduction --- p.63Chapter 3.2 --- Experimental --- p.65Chapter 3.2.1 --- Materials and Catalyst Preparation --- p.65Chapter 3.2.2 --- Characterization --- p.66Chapter 3.2.3 --- Photocatalytic Activity --- p.67Chapter 3.3 --- Results and Discussion --- p.68Chapter 3.3.1 --- XRD Analysis --- p.68Chapter 3.3.2 --- UV-Vis Absorption Spectroscopy and Bandgap Energies --- p.71Chapter 3.3.3 --- N2 Sorption Analysis --- p.73Chapter 3.3.4 --- SEM and TEM --- p.76Chapter 3.3.5 --- FT-IR Spectroscopy --- p.80Chapter 3.3.6 --- Raman Spectroscopy --- p.82Chapter 3.3.7 --- PL Measurements --- p.84Chapter 3.3.8 --- XPS Studies --- p.85Chapter 3.3.9 --- Photocatalytic Activity Measurements --- p.89Chapter 3.3.10 --- State and Form of Boron in TiO2 Lattice and its Effects --- p.91Chapter 3.4 --- Conclusions --- p.93Chapter 3.5 --- References --- p.94Chapter Chapter 4 --- Conclusions --- p.9