真空抽濾下噴塗石墨烯於多孔基材上進行堆疊結構與氫氣純化之探討

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姓名

尤翊丞(Yi-Cheng You) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

真空抽濾下噴塗石墨烯於多孔基材上進行堆疊結構與氫氣純化之探討
(Spray-Coating Graphene onto Porous Substrate under Vacuum Filtration for Hydrogen Purification)

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至系統瀏覽論文 (2025-7-31以後開放)

摘要(中)

組裝石墨烯膜 (Assembled graphene membrane) 在氣體分離應用上是一項具有潛力的材料；根據相關的研究，我們設計一系列的實驗條件來觀察堆疊結構的差異，而控制夾層間通道的空間是影響分離表現的關鍵因素；因此，有序的堆疊可以有效的避免無選擇性的空間存在。在這項研究中，最終的任務是從混合氣體中純化氫氣；首先，我們得經由超聲震盪和離心分離等程序製備分散良好的石墨烯懸浮液，進而我們嘗試藉由真空抽濾和噴塗法沉積石墨烯膜在多孔基材上。隨後，分析將著重於堆疊結構的觀察與比較經由調整噴塗條件後氣體分離的表現；加工過程中，我們操作的可控因素包括了控制片層尺寸、噴塗距離、懸浮液濃度和噴槍的進氣壓力。
在此，噴塗中最佳的操作條件建立了無缺陷的堆疊結構擁有出色的氫氣純化表現；在混合氣體的檢測中，氫氣分別從二氧化碳及甲烷中分離出來的選擇性分別高達181.6及39.7左右，同時在這項工作中氫氣的通量分別等於2797.8 GPU與2690.6 GPU。將傳統的真空抽濾法轉換為噴塗法使生產規模能夠擴大而更符合工業趨勢；而用多孔的高分子薄膜取代陽極氧化鋁基板 (Anodic alumina oxide, AAO) 能有效的降低生產成本。

摘要(英)

Assembled graphene membrane is a potential material for gas separation application. In according to relevant researches, we designed series of experimental conditions to observe the difference in stacking structure, since it is significant to control channel space between interlayer to impact separation performance. Thus, ordered stacking would effectively prevent the existence of non-selective spacing. In this research, the ultimate goal is to purify hydrogen from mixed gases. First, we prepared well-dispersed graphene suspension by sonication and centrifugation, and then we attempted to deposit graphene membrane onto porous substrate by vacuum filtration and spray-coating approaches. Afterwards, the analyses were focused on observation of stacking construction and comparison of gas separation performance via adjustment of spraying conditions. Among processing, controllable factors we operated included controlling sheets size, spraying distance, suspension concentration and inlet pressure from airbrush.
Herein, optimal operated condition in spray-coating built a defect-free stacking construction with remarkable H2 purification. In mixed gas separation investigation, H2/CO2 and H2/CH4 selectivities are up to around 181.6 and 39.7 respectively as well as H2 permeance equals 2797.8 and 2690.6 GPU respectively in this work. The switching from traditional vacuum filtration method to spray-coating method enables the production process to scale up in line with industrial tendency, and to replace the anodic alumina oxide (AAO) substrate with porous polymer membrane, effectively reducing the cost of production.

關鍵字(中)

★ 石墨稀薄膜
★ 噴塗法
★ 抽濾系統
★ 堆疊建構
★ 無缺陷薄膜
★ 混合氣體分離
★ 氫氣純化

關鍵字(英)

★ Graphene membrane
★ Spray-coating method
★ Vacuum filtration system
★ Stacking construction
★ Defect-free membrane
★ Mixed gas separation
★ Hydrogen purification

論文目次

摘要...................................................i
Abstract..............................................ii
Acknowledgement.......................................iv
Table of Contents......................................v
List of Figures......................................vii
List of Tables.........................................x
Chapter 1 Background...................................1
1-1 Introduction...................................1
1-2 Review of Relevant Literature..................6
1-3 Motivation....................................16
Chapter 2 Experimental................................17
2-1 Materials and Reagents........................17
2-2 Instruments...................................17
2-3 Instrument Analysis and Identification........18
2-3-1 Scanning Electron Microscopy (SEM)............18
2-3-2 X-ray Diffraction (XRD).......................19
2-3-3 Atomic Force Microscopy (AFM).................20
2-3-4 Mixed Gas Separation System...................21
2-4 Experiment Methods............................23
2-4-1 Preparation of Dispersed Graphene Suspension..23
2-4-2 Vacuum Filtration.............................23
2-4-3 Spray-Coating under Vacuum Filtration.........24
2-4-4 Mixed Gas Permeation Measurement..............26
Chapter 3 Result and Discussion.......................28
3-1 Graphene Nanosheet Size.......................28
3-2 Depositing SGR under Vacuum Filtration System.30
3-2-1 Depositing SGR onto AAO Support...............30
3-2-2 Depositing SGR onto PEEK Membrane.............32
3-3 Spray-Coating SGR under Vacuum Filtration.....36
3-3-1 Adjustment of Spraying Distance...............37
3-3-2 Adjustment of Suspension Concentration........42
3-3-3 Adjustment of Inlet Spraying Pressure.........47
3-4 Spray-Coating LGR under Vacuum Filtration.....53
3-4-1 Adjustment of Suspension Concentration........53
Chapter 4 Conclusion..................................59
Chapter 5 Future Work.................................60
Reference.............................................61

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指導教授

張博凱(Bor Kae Chang)

審核日期

2020-7-22

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