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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳乃立(Nae-Lih Wu) | |
| dc.contributor.author | Cheng-Chun Peng | en |
| dc.contributor.author | 彭正君 | zh_TW |
| dc.date.accessioned | 2021-06-13T16:29:33Z | - |
| dc.date.available | 2006-07-21 | |
| dc.date.copyright | 2005-07-21 | |
| dc.date.issued | 2005 | |
| dc.date.submitted | 2005-07-12 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/38287 | - |
| dc.description.abstract | 本實驗以溶膠/凝膠水熱法於180oC合成二氧化鈦晶體，並且在水熱過程中於溶膠/凝膠液中加入各式的添加劑共熱，包括一些常見的界面活性劑即有機或無機之酸鹼等，探討其對二氧化鈦晶體晶貌成長的影響。我們發現在酸性環境下，過量的氯離子或是檸檬酸根離子會藉由吸附於晶體表面來抑制晶體的成長，生成等晶向的晶體。一些常見的有機酸(甲酸、乙酸、苯甲酸)或是界面活性劑(PVP, CTAB)都有類似的效果。但在鹼性的環境中，晶體在各個晶向的成長的速率就不盡相同，較易生成短棒狀之晶體。我們發現當溶液中的氨水濃度增加到[NH3/Ti]=50時，二氧化鈦晶體會朝向<001>方向成長，生成含大量{110}晶面之短棒晶體。這些含{110}晶面的二氧化鈦晶體在紫外光(300 nm)的照射之下，在光催化消耗亞甲基藍的反應中較其他晶面展露出更高的反應活性。 | zh_TW |
| dc.description.abstract | TiO2 crystallites were synthesized by a solution chemistry process consisting of a sol-gel step followed by hydrothermal treatment at 180oC, and the effect of additives, including some commonly used surfactants, organic or inorganic acids and bases, on the morphology of crystallites were investigated. Excess chloride or citrate ions in acidic condition tend to retard the grain growth rate by undue adsorption to the crystallite surfaces, resulting in equidimensionl particles; certain organic acids (formic, acetic and benzoic acid) and surfactants (PVP, CTAB) displayed similar influences on the morphology of synthesized crystallites.
However, the growth rates along different lattice directions tend to differ in some basic conditions, leading to elongated crystallites. With increasing NH3 content from [NH3/Ti] = 0 to 50, TiO2 crystallites were increasingly elongated along <001> to form crystallite having predominantly {110} surface planes. While not significant in methyl orange solution, the surface catalytic activities of the crystallites toward degradation of methyl orange under UV-light (300 nm) illumination was found to increase with increasing {110} plane coverage. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T16:29:33Z (GMT). No. of bitstreams: 1 ntu-94-R92524019-1.pdf: 1573371 bytes, checksum: 9b65f5b1c5835851ec95fa2381d7d27a (MD5) Previous issue date: 2005 | en |
| dc.description.tableofcontents | Table of Contents
摘要 I Abstract II Table of Contents III List of Figures VI List of Tables XI Chapter 1. Introduction and Background 1 1.1 Introduction to Morphological Control of Particles 1 1.2 Characteristics of TiO2 4 1.3 Photocatalysis on TiO2 9 1.3-1 Principles of Photocatalysis on Semiconductors 9 1.3-2 Mechanisms for Photocatalysis on TiO2 12 1.3-3 Nano-effects on Photocatalysis 15 1.4 Preparation of Nanometer-sized TiO2 with Controlled Morphology 19 1.4-1 Mechanism of Sol-Gel Method 19 1.4-2 Hydrothermal Treatment 21 1.5 Application of Photocatalysis on TiO2 23 1.5-1 General Applications 23 1.5-2 Photocatalytic Degradation of Organic Compounds: Methyl Orange and Methylene Blue 27 Chapter 2. Experimental 34 2.1 Synthesis of TiO2 crystallites 34 2.1-1 Preparation of Ti Sol/Gel Solution 34 2.1-2 Hydrothermal Treatment 35 2.2 Structure and Morphology Analysis 38 2.2-1 XRD 38 2.2-2 BET 39 2.2-3 TEM/HRTEM 39 2.3 Kinetic Study on the Photocatalytic Reaction in TiO2/UV System 40 Chapter 3. Result and Discussion 44 3.1 TiO2 Crystallites Synthesized through Hydrothermal Treatment 44 3.2 The Effect of Acidic Additives on the Morphology of TiO2 48 3.3 The Effect of Surfactants on the Morphology of TiO2 53 3.4 The Effect of Alkaline Additives on the Morphology of TiO2 55 3.4-1 KOH and E4NOH 55 3.4-2 Ammonia 55 3.5 Degradation of Methyl Orange Photocatalyzed by TiO2 with Different Morphologies 68 3.5-1 Optimization of the Concentration of TiO2 Catalyst 68 3.5-2 Photocatalytic Activity of TiO2 with Different Morphology 72 3.6 Degradation of Methylene Blue Photocatalyzed by TiO2 with Different Morphology 75 3.6-1 Optimization of the Concentration of TiO2 Catalyst 75 3.6-2 Photocatalytic Activity of TiO2 with Different Morphology 79 Chapter 4. Conclusion 93 References 95 | |
| dc.language.iso | en | |
| dc.subject | 晶貌控制 | zh_TW |
| dc.subject | 二氧化鈦 | zh_TW |
| dc.subject | 水熱法 | zh_TW |
| dc.subject | 亞甲基藍 | zh_TW |
| dc.subject | Hydrothermal Method | en |
| dc.subject | TiO2 | en |
| dc.subject | Methylene blue | en |
| dc.subject | Morphology control | en |
| dc.title | 光觸媒晶貌調控之研究 | zh_TW |
| dc.title | Research on Morphological Control of Nanocrystalline Photocatalyst | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 93-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 吳紀聖(Chi-Sheng Wu),黃淑娟(Shu-Jiuan Huang) | |
| dc.subject.keyword | 二氧化鈦,水熱法,晶貌控制,亞甲基藍, | zh_TW |
| dc.subject.keyword | TiO2,Hydrothermal Method,Morphology control,Methylene blue, | en |
| dc.relation.page | 104 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2005-07-13 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
| 顯示於系所單位： | 化學工程學系 | |
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