Lee, Siu Yin. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

本论文主要研究了红磷作为可见光光催化剂在光解水产生氢气方面的应用。所涉及到的催化剂有：纯红磷，万寿菊状的P/YPO₄中空微米球，以及CoP₂修饰的红磷。论文也会讨论WO₃/TiO₂微米六方片及微米棒的制备，并介绍这些新材料在光解水产生氧气方面的应用。 / 第一章：发现了红磷作为可见光光催化材料在光解水制氢气领域的应用。从羟基自由基的检测和光电响应的测量表明，红磷具有在光照下产生电子和空穴的性质。同时，光生电子还原水的能力亦通过理论计算所验证。此外，半导体性质测试表明红磷具有p型半导体的性质。 / 第二章：通过红磷与YCl₃水溶液的反应，合成了万寿菊状的P/YPO₄中空微米球。所得到的微米球由结晶YPO₄纳米片和无定形红磷组成。光解水产生氢气表明，含有53 wt % YPO₄的P/YPO₄的光催化活性是红磷的6倍。同时，文中进一步讨论了中空微米球的形成机理及其光催化活性提高的原因。 / 第三章：研究并证明了CoP₂可以作为红磷光解水产生氢气的共催化剂。CoP₂的修饰可以极大的提高红磷的光解水产氢效率。其中，含2 wt % CoP₂的CoP₂/P的光解水产生氢气的速率较红磷提高了75倍。而且，CoP₂作为共催化剂的效率优于传统贵金属共催化剂Pt。关于CoP₂的共催化机理，初步认为与Co离子的配位作用有关。 / 第四章：通过简单的沉淀、煅烧反应，制备了由WO₃和 TiO₂纳米颗粒组装而成的WO₃/TiO₂微米棒和微米片。可见光氧化水产生氧气测试表明， WO₃/TiO₂复合物的光催化活性为WO₃的2.5倍以上。提出利用“颗粒堆积模型来解释WO₃/TiO₂ 微米棒和微米片的形成机理。 / 第五章：发现了WO₃对甲基蓝染料有趣的吸附性质。首先，利用钨酸铵，四丙基氢氧化铵和氯化钾合成了WO₃纳米棒。所制备的WO₃表现出了对甲基蓝很强的快速吸附能力。而且，WO₃在5s内所吸附的甲基蓝的量与活性炭在30分钟内的吸附相当。此外，通过离子间的作用力和“印迹-吸附过程对WO₃吸附甲基蓝的特性进行了解释。 / This thesis focuses primarily on the development of red phosphorus based visible-light-driven photocatalysts for hydrogen production from water. These materials include pure red phosphorus, hierarchical P/YPO₄ hollow microspheres, and CoP₂ loaded red phosphors. The fabrication of WO₃/TiO₂ microrods and plates with enhanced photocatalytic water oxidation property is also discussed. / Chapter I:Red phosphorus was discovered as a new visible-light driven photocatalyst for H₂ formation from the reduction of water by photogenerated electrons. The detection of hydroxyl radicals and results from photoconductivity measurements confirmed the photogeneration of electrons from the red phosphorus. Theoretical calculations indicated that the reduction of water by photogenerated electrons would be energetically possible. Moreover, a P-type semiconductor behavior of red phosphorus was observed. / Chapter II:Hierarchical P/YPO₄ hollow microspheres with enhanced photocatalytic activity than the individual components for hydrogen formation were prepared. The composite was synthesized by the reaction from amorphous red P and YCl₃ aqueous solution via a hydrothermal method. The final product consisted of crystalline YPO₄ nanosheets and amorphous red phosphorus. The composite with 53 wt % YPO₄ was up to 6 times more active than red phosphorus under visible light irradiation. The formation mechanism of hierarchical microspheres and the enhanced photocatalytic activity were discussed. / Chapter III:CoP₂ loaded as a cocatalyst significantly enhanced the rate of H2₂ formation from water over red phosphorus under visible light irradiation. The rate of H₂ formation over red P was increased by up to 75 times when loaded with 2 wt % CoP₂. The performance of CoP₂ as a cocatalyst was even higher than that of Pt. The coordination effect of Co ions was proposed to explain the enhanced photocatalytic activity by CoP₂ loaded. / Appendix I:WO₃/TiO₂ microrods and microplates assembled from WO₃ and TiO₂ nanoparticles were prepared by simple precipitation and calcination processes. Their photocatalytic properties for O₂ formation from water were investigated. The composites were c.a. 2.5 times more active than WO₃ in photocatalytic O₂ formation under visible light irradiation. The formation mechanism of WO₃/TiO₂ microstructures was explained from “particle packing mode“. / Appendix II:An interestingly adsorption property of hexagonal tungsten trioxide to MB was discovered. The WO₃ were prepared from ammonium metatungstate, tetrapropyl ammonium hydroxide and potassium chloride. The product exhibited a high adsorption capacity toward methylene blue (MB), and the time required for reaching adsorption equilibrium was less than 5 seconds. The amount of MB adsorbed by WO₃ in 5 s was equivalent to that adsorbed by activated carbon for 30 min. Ionic interaction and “imprinting-adsorption“ were proposed to explain the adsorption property of as-prepared WO₃ sample. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Wang, Feng. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese. / Abstract (Chinese) --- p.i / Abstract --- p.iii / Acknowledgement --- p.vi / List of Figures --- p.viii / List of Tables --- p.xviii / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Basic Principles of Photocatalytic Water Splitting --- p.1 / Chapter 1.2 --- Strategies to Develop Visible-light-driven Photocatalysts --- p.3 / Chapter 1.2.1 --- Native visible-light-driven photocatalysts --- p.3 / Chapter 1.2.2 --- Doping --- p.6 / Chapter 1.2.2.1 --- Metal or non-metal ions doping --- p.6 / Chapter 1.2.2.2 --- Co-doping --- p.10 / Chapter 1.2.2.3 --- Homogeneous doping --- p.12 / Chapter 1.2.3 --- Solid solution photocatalysts --- p.15 / Chapter 1.2.4 --- Dye sensitized photocatalysts --- p.17 / Chapter 1.3 --- Strategies to Enhance Photocatalytic Efficiency --- p.19 / Chapter 1.3.1 --- Semicondutor combination --- p.19 / Chapter 1.3.1.1 --- Inorganic sensitization --- p.20 / Chapter 1.3.1.2 --- Bidirectional charge-carrier transfer --- p.21 / Chapter 1.3.1.3 --- Indirect Z-scheme --- p.22 / Chapter 1.1.1.4 --- Direct Z-scheme --- p.23 / Chapter 1.3.2 --- Cocatalyst loading --- p.24 / Chapter 1.3.2.1 --- Noble metal cocatalysts --- p.24 / Chapter 1.3.2.2 --- Metal oxide cocatalysts --- p.25 / Chapter 1.3.2.3 --- Metal sulfide cocatalysts --- p.26 / Chapter 1.3.2.4 --- Mixed cocatalysts --- p.27 / Chapter 1.3.3 --- Hydrogen Generation Systems Containing Sacrificial Reagents --- p.32 / Chapter 1.4 --- Summary --- p.34 / Chapter 1.5 --- Aim of This Thesis and Its Significance --- p.35 / Chapter 1.6 --- References --- p.36 / Chapter Chapter Two --- Red Phosphorus: An Elemental Photocatalyst for Hydrogen Formation from Water under Visible Light Irradiation --- p.52 / Chapter 2.1 --- Introduction --- p.52 / Chapter 2.2 --- Experimental --- p.54 / Chapter 2.2.1 --- Synthesis --- p.54 / Chapter 2.2.1.1 --- Preparation of crystalline red phosphorus --- p.54 / Chapter 2.2.1.1 --- Preparation of red phosphorus films --- p.54 / Chapter 2.2.2 --- Characterization --- p.55 / Chapter 2.2.3 --- Gas evolution tests --- p.56 / Chapter 2.2.4 --- Detection of photogenerated OH radicals --- p.56 / Chapter 2.2.5 --- Computational details --- p.57 / Chapter 2.2.6 --- Photoconductivity measurements and electrical tests --- p.57 / Chapter 2.3 --- Results and Discussion --- p.59 / Chapter 2.4 --- Conclusions --- p.74 / Chapter 2.5 --- References --- p.75 / Chapter Chapter Three --- Hierarchical P/YPO4 Microsphere for Photocatalytic Hydrogen Production from Water under Visible Light Irradiation --- p.79 / Chapter 3.1 --- Introduction --- p.79 / Chapter 3.2 --- Experimental --- p.81 / Chapter 3.2.1 --- Synthesis --- p.81 / Chapter 3.2.2 --- Characterization --- p.81 / Chapter 3.2.3 --- Gas evolution tests --- p.82 / Chapter 3.3 --- Results and Discussion --- p.83 / Chapter 3.4 --- Conclusions --- p.95 / Chapter 3.5 --- References --- p.95 / Chapter Chapter Four --- Enhancement of Photocatalytic H₂ Formation from Water over Red P by Loading CoP₂ as Cocatalyst --- p.99 / Chapter 4.1 --- Introduction --- p.99 / Chapter 4.2 --- Experimental --- p.100 / Chapter 4.2.1 --- Synthesis --- p.100 / Chapter 4.2.2 --- Characterization --- p.101 / Chapter 4.2.3 --- Hydrogen formation tests --- p.101 / Chapter 4.3 --- Results and Discussion --- p.103 / Chapter 4.4 --- Conclusions --- p.109 / Chapter 4.5 --- References --- p.109 / Chapter Chapter Five --- Conclusions and Future Work --- p.112 / Chapter 5.1 --- Conclusions --- p.112 / Chapter 5.2 --- Recommendations for future work --- p.112 / Chapter Appendix I --- WO₃/TiO₂ Microstructures for Photocatalytic Water Oxidation under Visible Light Irradiation --- p.114 / Chapter AI.1 --- Introduction --- p.114 / Chapter AI.2 --- Experimental --- p.116 / Chapter AI.2.1 --- Sample preparation --- p.116 / Chapter AI.2.1.1 --- Precursor synthesis --- p.116 / Chapter AI.2.1.2 --- Synthesis of assembled WO₃/TiO₂ microstructures --- p.118 / Chapter AI.2.2 --- Characterization --- p.119 / Chapter AI.2.3 --- Oxygen formation tests --- p.120 / Chapter AI.3 --- Results and Discussion --- p.121 / Chapter AI.4 --- Conclusions --- p.137 / Chapter AI.5 --- References --- p.137 / Chapter Appendix II --- Hexagonal Tungsten Trioxide Nanorods as a Rapid Adsorbent for Methylene Blue --- p.142 / Chapter AII.1 --- Introduction --- p.142 / Chapter AII.2 --- Experimental --- p.143 / Chapter AII.2.1 --- Sample preparation --- p.143 / Chapter AII.2.2 --- Characterization --- p.144 / Chapter AII.3 --- Results and Discussion --- p.145 / Chapter AII.4 --- Conclusions --- p.159 / Chapter AII.5 --- References --- p.159 / List of Publications --- p.163

Photochemical transformations give rise to radical intermediates that are enabling tools for constructing molecular scaffolds in alternative methods from traditional two-electron processes. Herein, we detail four discrete projects focused on harnessing photochemically-created radicals for building nitrogen-containing architectures. We first explored a formal [5+2] photochemical cycloaddition of vinyl-pyrrolidinones in order to efficiently reach densely functionalized azepane motifs from simple aldehydes and pyrrolidinones. Second, we describe the discovery and development of a cobalt and photoredox catalyzed hydroaminoalkylation of conjugated dienes to afford functionalized homoallylic amines. Third, we explored the union of metal-nitrene catalysts and photoredox in efforts to forge new aliphatic C-N bonds. Finally, we established a method for the remote functionalization of unactivated sp3 C-H bonds with nickel metallophotoredox, which can be specifically controlled to deliver a new C-C bond at different unactivated methylenes.

In this study, two kinds of effective VLD photocatalysts, AgBr-Ag-Bi 2WO6 nanojunction and Zn:In(OH)ySz solid solution nanoplates have been synthesized and characterized. Zn:In(OH) ySz solid solution nanoplates (Synthesis conditions: 45 mmol L-1 thiourea, 26 mmol L-1 SDS, 0.4≤X≤0.7) have high VLD photocatalytic activities on the degradation of Rhodamine B (RhB), which is due to their suitable band gap and potentials of conduction band and valence band as well as their uniform and small diameter sizes (about 10 nm in width and about 15 nm in length). AgBr-Ag-Bi2WO6 nanojunction exhibits excellent VLD photocatalytic performance both on the degradation of Procion Red MX-5B and pentachlorophenol, and on the disinfection of various bacteria including Escherichia coli, Pseudomonas fluorescens and Alteromonas macleodii. Its excellent performance results from the broadened visible-light response and the synergic effect among the three components under the visible light irradiation, namely the vectorial electron transfer of Bi2WO6→Ag→AgBr. / Moreover, a novel and versatile partition setup has been first constructed to investigate the fundamental mechanism of photocatalytic process. The results indicate that the functional reactive species produced by VLD Zn:In(OH) ySz solid solution nanoplates mainly remain on the surface, thus the direct contact between Zn:In(OH)ySz solid solution nanoplates and RhB is a prerequisite for the degradation of RhB during the photocatalytic process. However, the functional reactive species produced by AgBr-Ag-Bi2WO6 nanojunction can diffuse into the bulk, thus the direct contact between the AgBr-Ag-Bi2WO6 nanojunction and bacteria is unnecessary for the photocatalytic disinfection of bacteria. / Recent years, environmental problems related to organic pollutants and pathogenic microorganisms have emerged as a high national and international priority. To address these significant problems, photocatalysis causes increasing interest as a kind of green and energy-saving technology. However, the traditional photocatalyst TiO2 can only be excited by ultraviolet or near-ultraviolet radiation, which merely occupies about 4% of the solar light spectrum. Notably, the visible region covers the largest proportion of the solar spectrum (about 48%). In order to efficiently utilize solar light, the development of visible-light-driven (VLD) photocatalysts with excellent performances has been urged. / Therefore, in this work, the exploration of VLD photocatalyst gives us the opportunities to utilize solar energy to solve the environmental problems and energy crisis, and the investigation of fundamental mechanism provides us more deep understanding for photocatalytic process. / Zhang, Lisha. / Adviser: P. K. Wong. / Source: Dissertation Abstracts International, Volume: 72-04, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 159-171). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

Wu Ling. / "Dec 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

In addition, through a simple post-thermal treatment of TiO2 thin films on glass with trifluoroacetic acid (TFA), the thin films showed enhancement in the photocatalytic decomposition of acetone in air. XPS, FTIR and PL results revealed that the TFA complex bound on the surface of TiO 2 acted as an electron scavenger, and thus reduced the recombination of photo-generated electrons and holes. / Part I. TiO2 films on stainless steel prepared by dip coating in a nonionic microemulsion solution were investigated. These thin films have been shown to have much higher photocatalytic activity than films on glass substrates. XPS showed that Fe3+ and Fe 2+ ions, which were diffused from stainless steel substrate into TiO 2 films during high temperature calcination, behaved as dopants to significantly affect its photocatalytic activity of the films. The TiO2 films also exhibited excellent photo-induced hydrophilicity and antibacterial effect on the sterilization of Bacillus pumilus. / Part II. New approaches have been developed for the fabrication of visible light photocatalysts. MoS2 and WS2 were coupled to TiO2 by an in situ photo-reduction deposition method, taking advantage of the reducing power of TiO2 particles. The synthesis of CdSe sensitized TiO2 using an ultrasound-driven approach was also reported. The photocatalytic degradation of methylene blue and 4-chlorophenol was employed to evaluate their visible light photocatalytic activity. The small band gap semiconductors acting as photo-sensitizers not only extended the spectral response of TiO2 to the visible region but also improved their photocatalytic efficiency. The blue shift in the absorption onset confirmed the size-quantization of photosensitizers, which altered the conduction and valence band levels in the coupled semiconductor systems making it possible to utilize visible light in photocatalysis. (Abstract shortened by UMI.) / Two important aspects of the TiO2 photocatalysis were studied in this thesis. The first part reports on the improvement of photocatalytic performance of TiO2 films through approaches such as post-thermal treatment, surface modification and metal doping. The second part describes the fabrication of visible light TiO2 photocatalyts by means of coupling with small band gap semiconductor photo-sensitizers and non-metal doping. / Ho Wing-kei. / "May 2005." / Adviser: Jimmy C. Yu. / Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0294. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

The photocatalytic properties of titanium dioxide have been widely studied since the discovery in 1972 of water photolysis by TiO2 electrodes. Rutile and anatase are the most studied of the different TiO2 polymorphs due to their chemo-physical properties. When irradiated with ultraviolet light, TiO2 is able to absorb photons, creating on the surface an electron and a positive “hole”. This electron-hole pair then reacts with water and oxygen, generating chemical radicals. These are very unstable and reactive species which can neutralise pollutants. In the introduction pollutants and their influence in the air quality are described as well as the state of art of TiO2, photochemistry; semiconductor doping, chemo-physical principles, and TiO2 coatings. Various protocols to test photoactivity of both powders and coatings are discussed studying both gas phase and liquid phase reactions looking at UV and visible light irradiation. The sol-gel synthesis of pure and tungsten- and cobalt-doped TiO2, as well as graphene/TiO2 hybrids, was explored modifying the conditions and parameters to optimise the photocatalytic activation of TiO2 in the visible light range. A comprehensive study of manufactured and commercially available TiO2 powders and coatings was performed to identify the differences between photocatalytic properties, using electron microscopy, Raman and UV-vis diffusive spectroscopy and X-ray diffraction. An important question that was answered in this thesis is whether the physical properties of nanoparticles or their electronic properties are critical for their photocatalytic behaviour. Results for doped powders of different particle size and surface area showed how the positioning of their electronic band gap with the wavelength of the visible light source was fundamental for an effective photocatalytic process for the application wantedIn the application of TiO2 for the built environment, lime and MDF were considered as substrates for coatings. Lime-based coatings were prepared mixing commercial K7000 TiO2 with the plaster and photoactivity of the coatings was evaluated looking at formaldehyde degradation. MDF based coating were produced using both produced sol-gel pure, doped TiO2 and tested by observing degradation of Ink Intelligent inks under both UV and visible light confirming the photoactivity. Throughout this work sol-gel was employed for the production of pure and doped TiO2 nanoparticles with the anatase crystalline phase. Photocatalytic tests on the synthesised particles under UV light shows comparable performances with commercial particles. Synthesised particles and coatings shows promising performances, higher than commercially available particles when irradiated with visible light confirming a possible application in indoor environment.

Woo, On Ting. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 102-121). / Abstracts in English and Chinese. / Acknowledgements --- p.i / Abstract --- p.ii / Table of Contents --- p.vi / List of Figures --- p.ix / List of Plates --- p.xiv / List of Tables --- p.xv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- General characteristics --- p.1 / Chapter 1.2 --- Sources of PAHs --- p.6 / Chapter 1.3 --- Adsorption of PAHs --- p.7 / Chapter 1.4 --- Environmental fate of PAHs --- p.9 / Chapter 1.4.1 --- Transformation --- p.10 / Chapter 1.4.1.1 --- PAHs in atmosphere --- p.10 / Chapter 1.4.1.2 --- PAHs in water --- p.11 / Chapter 1.4.1.3 --- PAHs in soil and sediment --- p.12 / Chapter 1.4.2 --- Route of entry into human --- p.13 / Chapter 1.5 --- Toxicity of PAHs on human --- p.14 / Chapter 1.5.1 --- Cancer --- p.14 / Chapter 1.5.2 --- Other health effects - acute effects --- p.16 / Chapter 1.5.3 --- Other health effects - chronic effects --- p.16 / Chapter 1.5.3.1 --- Respiratory effect --- p.16 / Chapter 1.5.3.2 --- Dermal effect --- p.17 / Chapter 1.6 --- Treatment methods of PAHs --- p.17 / Chapter 1.6.1 --- Incineration --- p.17 / Chapter 1.6.2 --- Bioremediation --- p.18 / Chapter 1.6.3 --- Chemical oxidation --- p.19 / Chapter 1.6.4 --- Combined biological-chemical treatment --- p.22 / Chapter 1.6.5 --- Advanced oxidation processes --- p.23 / Chapter 1.6.5.1 --- Photocatalytic oxidation --- p.24 / Chapter 1.6.5.2 --- Operation parameters of PCO --- p.26 / Chapter 1.7 --- PAH contamination in Hong Kong --- p.27 / Chapter 2 --- Objectives --- p.28 / Chapter 3 --- Materials and methods --- p.29 / Chapter 3.1 --- Chemicals --- p.29 / Chapter 3.2 --- Photocatalytic reactor --- p.30 / Chapter 3.3 --- Ultrasonic extraction of PAHs --- p.32 / Chapter 3.4 --- Quantification of PAHs --- p.32 / Chapter 3.5 --- Photocatalytic reactivity of PAHs --- p.34 / Chapter 3.6 --- The effect of acetone on performance of PCO --- p.35 / Chapter 3.7 --- Identification of intermediates of PAHs --- p.36 / Chapter 3.8 --- Toxicity test --- p.38 / Chapter 3.9 --- Study of mixture effect --- p.40 / Chapter 4 --- Results and discussion --- p.42 / Chapter 4.1 --- Quantification of PAHs --- p.42 / Chapter 4.2 --- Extraction efficiency of PAHs --- p.42 / Chapter 4.3 --- Photocatalytic reactivity of PAHs --- p.44 / Chapter 4.4 --- The effect of acetone on performance of PCO --- p.52 / Chapter 4.5 --- Identification of intermediates --- p.62 / Chapter 4.5.1 --- PCO degradation of naphthalene --- p.62 / Chapter 4.5.2 --- PCO degradation of acenaphthylene --- p.66 / Chapter 4.5.3 --- PCO degradation of phenanthrene --- p.69 / Chapter 4.5.4 --- PCO degradation of anthracene --- p.72 / Chapter 4.5.5 --- PCO degradation of benzo[a]anthracene --- p.75 / Chapter 4.5.6 --- PCO degradation of pyrene --- p.78 / Chapter 4.6 --- Toxicity test --- p.80 / Chapter 4.7 --- Study of mixture effect --- p.87 / Chapter 5 --- Conclusions --- p.99 / Chapter 6 --- References --- p.102 / Chapter 7 --- Appendices --- p.122

Hu, Zhuofeng. / Thesis Ph.D. Chinese University of Hong Kong 2014. / Includes bibliographical references. / Abstracts also in Chinese. / Title from PDF title page (viewed on 24, October, 2016).

Ding, Zhimin = 遺態二氧化鈦的製備和表徵及其在光催化中的性能分析 / 丁志敏. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references. / Abstracts in English and Chinese. / Ding, Zhimin = Yi tai er yang hua tai de zhi bei he biao zheng ji qi zai guang cui hua zhong de xing neng fen xi / Ding Zhimin. / ABSTRACT --- p.i / 摘要 --- p.iii / Acknowledgement --- p.v / Table of Contents --- p.vi / List of Figures --- p.ix / List of Tables --- p.xiii / Chapter Chpater 1 --- Introduction --- p.1 / Chapter 1.1 --- Titanium dioxide --- p.1 / Chapter 1.1.1 --- Lattice structure --- p.2 / Chapter 1.1.2 --- Phase transition --- p.3 / Chapter 1.1.3 --- Energy band structure --- p.4 / Chapter 1.1.3.1 --- Band structure of titanium dioxide --- p.4 / Chapter 1.1.3.2 --- Quantum size effect --- p.6 / Chapter 1.1.4 --- Principle of photocatalysis --- p.8 / Chapter 1.1.5 --- Improvement of the TiO2 photocatalyst --- p.10 / Chapter 1.1.5.1 --- Noble metal deposition --- p.10 / Chapter 1.1.5.2 --- Coiq)led semiconductor --- p.11 / Chapter 1.1.5.3 --- Ion doping --- p.12 / Chapter 1.2 --- Biomorphic materials --- p.13 / Chapter 1.3 --- Cotton template --- p.14 / Chapter 1.3.1 --- Composition of cotton --- p.14 / Chapter 1.3.2 --- Cotton structure --- p.15 / Chapter 1.4 --- Methyl orange --- p.16 / Chapter 1.5 --- Objectives and thesis layout --- p.18 / References --- p.19 / Chapter Chapter 2 --- Methodology and Instrumentation --- p.27 / Chapter 2.1 --- Sample preparation --- p.27 / Chapter 2.1.1 --- Template and precursors --- p.27 / Chapter 2.1.2 --- Synthesis of the Ti02-TTIP samples --- p.28 / Chapter 2.1.2.1 --- Methodology --- p.28 / Chapter 2.1.2.2 --- Fabrication procedures --- p.31 / Chapter 2.1.3 --- Synthesis of the TiO2-TALH samples --- p.32 / Chapter 2.1.3.1 --- Methodology --- p.32 / Chapter 2.1.3.2 --- Fabrication procedures --- p.33 / Chapter 2.2 --- Characterization --- p.33 / Chapter 2.2.1 --- Scanning electron microscope (SEM) --- p.33 / Chapter 2.2.2 --- Transmission electron microscope (TEM) --- p.34 / Chapter 2.2.3 --- Raman spectroscopy (RS) --- p.34 / Chapter 2.2.4 --- X-ray diffractometry (XRD) --- p.34 / Chapter 2.2.5 --- Thermo gravimetric analysis (TGA) --- p.35 / Chapter 2.2.6 --- Differential thermal analysis (DTA) --- p.36 / Chapter 2.2.7 --- Ultraviolet-visible spectroscopy (UV-vis) --- p.36 / Chapter 2.3 --- Photocatalytic performance --- p.37 / Chapter 2.3.1 --- Lambert-Beer's law --- p.37 / Chapter 2.3.2 --- "Verification of Beer,s Law" --- p.38 / Chapter 2.3.3 --- Photocatalytic evaluation procedures --- p.39 / Chapter 2.3.3.1 --- Glass beaker --- p.39 / Chapter 2.3.3.2 --- Quartz vessel --- p.40 / References --- p.41 / Chapter Chapter 3 --- Results of Characterizations --- p.43 / Chapter 3.1 --- Characterization of Ti02-TTIP --- p.43 / Chapter 3.1.1 --- Effect of calcination temperature on the samples --- p.43 / Chapter 3.1.1.1 --- DTA and TGA results --- p.43 / Chapter 3.1.1.1.1 --- Pure cotton --- p.43 / Chapter 3.1.1.1.2 --- Sol-infiltrated cotton --- p.45 / Chapter 3.1.1.2 --- XRD results --- p.47 / Chapter 3.1.1.3 --- Raman spectra results --- p.51 / Chapter 3.1.1.4 --- SEM results --- p.54 / Chapter 3.1.2.5 --- TEM results --- p.58 / Chapter 3.1.1.6 --- UV-visible absorption spectra --- p.60 / Chapter 3.1.2 --- Effect of calcination duration on the properties of samples --- p.61 / Chapter 3.1.2.1 --- XRD results --- p.62 / Chapter 3.1.2.2 --- Raman spectra results --- p.65 / Chapter 3.2 --- Characterization ofTiO2 -TALH --- p.67 / Chapter 3.2.1 --- DTA and TGA results --- p.67 / Chapter 3.2.2 --- XRD results --- p.69 / Chapter 3.2.3 --- Raman spectra results --- p.72 / Chapter 3.2.4 --- SEM results --- p.73 / Chapter 3.2.5 --- TFM rpcnltc --- p.76 / Chapter 3.2.6 --- UV-visible absorption spectra --- p.78 / References --- p.79 / Chapter Chapter 4 --- Photocatalytic Performance --- p.81 / Chapter 4.1 --- Verification of Beer's Law --- p.81 / Chapter 4.2 --- Photocatalytic results --- p.82 / Chapter 4.2.1 --- MO solution contained by glass beaker --- p.83 / Chapter 4.2.2 --- MO solution contained by quartz vessel --- p.86 / Chapter 4.2.3 --- Photocatalytic performance of TiO2-TALH sample prepared at 600°C --- p.90 / Chapter 4.3 --- Discussions --- p.92 / References --- p.94 / Chapter Chapter 5 --- Conclusions and Future Works --- p.95 / Chapter 5.1 --- Conclusions --- p.95 / Chapter 5.2 --- Future works --- p.98 / References --- p.99