博碩士論文 104326021 詳細資訊




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姓名 羅弘駿(HONG-JYUN LUO)  查詢紙本館藏   畢業系所 環境工程研究所
論文名稱 利用二氧化鈦/活性碳電極進行電容去離子處理鄰苯二甲酸氫鉀之研究
(The Removal of Potassium Hydrogen Phthalate via Capacitive Deionization Using TiO2/AC Composite Electrode)
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摘要(中) 廢污水的有機污染主要來自塑料、染料、農藥及食品加工業,其對環境與生態具有一定程度之危害,包括降低水中溶氧、產生臭味等等。
本研究是製備活性碳電極並透過電容去離子實驗從水溶液中去除有機化合物(鄰苯二甲酸氫鉀,KHP)。除此之外,探討流速、初始濃度和施加電壓對電容去離子的脫鹽性能的影響。另一方面,採用溶膠凝膠法製備二氧化鈦/活性碳複合式電極,並進一步探討了添加二氧化鈦是否能提高CDI脫鹽效率。利用pseudo-first-order、pseudo-second-order、Elovich 和intra-particle diffusion四種動力吸附模式來對活性碳電吸附KHP進行模擬。電極材料經由特性分析的結果顯示中孔比均大於80%,說明中孔在本研究中起著重要作用。透過XRD分析可以知道在500℃高溫鍛燒下製備了最佳強度的銳鈦礦結晶。由活性碳電極的電吸附結果得知KHP在流速60 ml/min,初始濃度50 ppm下可以達到較優異的電吸附效果。活性碳電吸附磷酸鹽類的動力學模式符合pseudo-second-order模式。
10wt.%的二氧化鈦/活性碳複合式電極較AC電極具有更好的去除KHP效果,且吸附循環性能顯示10wt%的二氧化鈦/活性碳複合式電極較AC電極具有更好的耐用性和穩定性。
摘要(英) The sources of organic pollution in the environment mainly include the wastewater from food factories, petrochemicals, pesticides, plastics, dyes, and etc. The impact of organic compounds for environmental, including the decline of dissolved oxygen in aquaculture, difficult to resolve in water and creature, and etc.
To prepare of activated carbon electrode to remove organic compound (potassium hydrogen phthalate, KHP) via CDI experiment from aqueous solutions. On the other hand, the influences of flow rate, initial concentration and applied voltage are investigated. TiO2/AC composite powder was prepared with the sol–gel method and further discuss about the addition of TiO2 whether enhance CDI desalination efficiency than the carbon electrode. Four kinetic models, including pseudo-first-order, pseudo-second-order, Elovich, and intra-particle diffusion models, were employed to fit the electrosorption kinetic of KHP. All the mesopore ratios of electrode material are higher than 80%, which indicate that the mesopore play an important role in this study. From XRD analysis of the TiO2/AC composite electrode indicates that can obtain a good anatase crystalline by the sol-gel method and the optimum anatase crystal strength was prepared at the 500℃. It is possible to know from the CDI experiment that the best operating conditions of AC electrode for removing KHP were the flow rate of 60 ml/min and the initial concentration of 50 ppm. The adsorption kinetics could be described by the pseudo-second-order model.
The 10 wt.% TiO2/AC composite electrode has better removal amount of KHP than the AC electrode, which means the addition of titanium dioxide has the effect of improving the activated carbon. In addition, the adsorption cycle performance of CDI indicates that 10 wt.% TiO2/AC composite electrode has better durability and stability than AC electrode.
關鍵字(中) ★ 電吸附
★ 溶膠凝膠法
★ 有機物
關鍵字(英) ★ electrosorption
★ sol-gel method
★ organic compound
論文目次 ABSTRACT II
摘要 IV
致謝 V
CONTENT VI
FIGURES VIII
TABLES IX
CHAPTER I INTRODUCTION 1
1.1. General Background Information 1
1.2. Objectives 3
CHAPTER II LITERATURE REVIEW 5
2.1 Capacitive deionization (CDI) 5
2.1.1 Theory of capacitive deionization 5
2.1.2 Theory and development of electric double layer 6
2.1.3 Electric double layer overlap 9
2.2 Factors affecting of capacitive deionization 10
2.2.1. Electrode materials 10
2.2.2. Factors affecting of electrosorption 13
2.3 TiO2/AC composite carbon materials 15
2.3.1 TiO2 structural characteristics 16
2.3.2 Preparation of TiO2 by sol-gel method 19
2.3.3 Application of TiO2/AC composites materials in CDI 22
CHAPTER III MATERIALS AND METHODS 26
3.1. Preparation of electrodes 26
3.1.1 Purification of AC 26
3.1.2 Preparation of TiO2/AC composite 27
3.1.3 Preparation of AC and TiO2/AC electrode 29
3.2. Characterization of material 31
3.3. Capacitive deionization system 34
3.4. Analysis of potassium hydrogen phthalate (KHP) 36
3.5. Data Analysis 37
3.5.1. Experimental calculation 37
3.5.2. Kinetic model 38
3.6. Hydroxyl radical (‧OH) detection method 39
CHAPTER Ⅳ RESULTS AND DISCUSSION 41
4.1. Characteristics of electrode 41
4.1.1. SEM and EDS of electrode materials 41
4.1.2. Specific surface area and pore size distribution of electrode material 44
4.1.3. XRD analysis of TiO2/AC composite materials 47
4.1.4. Surface functional groups on electrode material 48
4.1.5. Electrochemical properties of AC and TiO2/AC electrodes 51
4.2. Removal of KHP by AC electrode in CDI 57
4.2.1. Effects of flow rate on removal of KHP 57
4.2.2. Effects of initial concentration on removal of KHP 58
4.2.3. Kinetics of KHP electrosorption 61
4.3. Removal of KHP by TiO2/AC electrode 65
4.3.1. Effects of the Ti content on removal of KHP 65
4.3.2. Effects of voltage on removal of KHP 66
4.4. Removal mechanisms of KHP by TiO2/AC electrode in CDI 68
4.4.1. Regeneration of electrodes 68
4.4.2. Non-capacitive adsorption and capacitive adsorption of KHP 69
4.4.3. Electro oxidation via hydroxyl radical (‧OH) 70
4.4.4. Characteristics of the electrode after electrosorption 72
CHAPTER V CONCLUSION AND SUGGESTION 74
5.1. Conclusion 74
5.2. Suggestion 75
APPENDIX 76
REFERENCES 78
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指導教授 秦靜如 審核日期 2018-7-20
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