請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/82169完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 侯嘉洪(Chia-Hung Hou) | |
| dc.contributor.author | Kuan-Yu Chen | en |
| dc.contributor.author | 陳冠宇 | zh_TW |
| dc.date.accessioned | 2022-11-25T06:33:08Z | - |
| dc.date.copyright | 2021-11-06 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-08-16 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/82169 | - |
| dc.description.abstract | "由於全球性的水資源匱乏,發展低能耗的水處理技術,提供新興水資源(如海水淡化、回收雨水或再生水)為重要的研究議題。其中,取用廢污水並經過處理後之再生水,回收處理過程中的能源需求相對較低,且不易受氣候限制,可以作為優先發展的新興水資源。電容去離子技術(capacitive deionization, CDI)是新穎的電化學脫鹽技術,對於進流濃度小於4000 mg/L的溶液(如半鹽水)進行脫鹽時具有低能耗的優勢。然而,受限於其固定式電極的有限脫鹽容量,CDI應用於高濃度溶液時較不具能源效率。因此,液流式電容去離子技術(flow-electrode capacitive deionization, FCDI)被進一步提出,其以流電極(flow-electrode)取代CDI的固定式電極,以期能將此技術應用於高濃度溶液的脫鹽,包含高導電度廢水、海水淡化與淨零排放等。 本研究的目的為建立FCDI模組系統,研究流電極組成對於脫鹽表現之影響,釐清相關反應機制,並評估應用於廢水脫鹽的可行性。在本研究中, FCDI模組具有三個通道,包含陽極室、陰極室與脫鹽室,其中,兩極室通入流電極,其組成為包含活性碳、奈米碳管與氯化鈉溶液所,脫鹽室則通入處理的氯化鈉溶液。若對FCDI系統施加外部電場,脫鹽室中的離子將受電場吸引,陰離子通過陰離子交換膜(anion exchange membrane, AEM),遷移至陽極室;而陽離子則通過陽離子交換膜(cation exchange membrane, CEM),遷移至陰極室。遷移至兩極室的離子將進入流電極的氯化鈉溶液中,或進入活性碳孔洞內,形成電雙層(electrical double-layer, EDL),脫鹽室中的離子得以被去除,產生淨水。本研究首先以不同的奈米碳管添加量(0.00, 0.05, 0.25, 0.50 wt.%)進行實驗,決定10 wt.%活性碳流電極中的最佳導電添加物量,其次則探討在不同操作電壓(1.2, 1.6, 2.0 V)與處理不同濃度氯化鈉溶液(0.05, 0.10, 0.30, 0.50 M),FCDI的脫鹽表現與能源消耗的影響。 由實驗結果可得知,添加奈米碳管於10 wt.%活性碳流電極中,可以顯著地提升脫鹽表現。當以1.6 V處理初始濃度為0.10 M的氯化鈉溶液時,奈米碳管添加量為0.50 wt.%時的脫鹽速率可達1.69 μmol/cm2-min,為不添加奈米碳管時的1.85倍,而單位莫耳能耗(molar energy consumption, Em)為0.040 kWh/mol,較不添加奈米碳管時減少15%。這是由於奈米碳管的導電性較活性碳高,且在流電極中,奈米碳管可在活性碳顆粒間扮演橋樑的腳色(bridge effect),在充電時形成導電網路(conductive network),提供材料間更頻繁的碰撞機會。此導電網路對於FCDI有關鍵的影響,可以提升流電極的電化學表現,進而提升整體系統的性能。另一方面,本研究也分析流電極在不同奈米碳管添加量下的黏滯度。結果顯示,隨著奈米碳管添加量的提升,流電極的黏滯度(viscosity)也將增加,造成較差的流動性(flowability)。此現象可能導致幫浦能耗的提升甚至模組的阻塞。因此,在添加導電添加物(conductive additives)時,應注意其對流電極黏滯度的影響,以避免影響操作。 接著以處理初始濃度為0.05 M的氯化鈉溶液為例,當施加電壓為1.6 V、奈米碳管添加量為0.25 wt.%時,ASRR為0.96 μmol/cm2−min,而單位莫耳能耗(molar energy consumption, Em)為0.041 kWh/mol。當初始濃度提升至0.30 M時,ASRR亦提升至2.07 μmol/cm2−min,且可維持Em於0.045 kWh/mol。由此可知,FCDI技術可將CDI系統的應用範圍增廣,並維持一定的能源效率。此外,本研究將以各項指標及水質分析,評估FCDI系統應用於真實廢水的可行性。FCDI系統可以0.034 kWh/mol的能耗,將廢水的總溶解固體濃度(total dissolved solids, TDS)由4891.2 mg/L 降至273.3 mg/L。其中,水體中的鈉離子(Na+)、鋇離子(Ba2+)、鋅離子(Zn2+)、氯離子(Cl−)與硝酸根離子(NO3−)的去除率皆可達90%以上。結論而言,FCDI是一個新穎的電化學脫鹽技術,可突破CDI系統的應用於中高鹽度進流的限制,且有助於廢污水回收再生技術的發展。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-25T06:33:08Z (GMT). No. of bitstreams: 1 U0001-1008202116534700.pdf: 5126850 bytes, checksum: d316daefc7f0b80cdd4651b73abc6221 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | 中文摘要 iii Abstract v Contents vii List of Figures ix List of Tables xii Chapter 1 Introduction 1 1.1 Background 1 1.2 Motivation and Objectives 1 Chapter 2 Theory and Literature Review 4 2.1 Capacitive Deionization Technology 4 2.2 Flow-electrode Capacitive Deionization Technology 7 Chapter 3 Experimental 17 3.1 Materials and Instruments 17 3.2 Research Design 19 3.3 Preparation and Characteristics of Flow-electrode 20 3.3.1 Preparation of Flow-electrodes 20 3.3.2 Characteristics of Flow-electrodes 21 3.4 Setup of FCDI system 21 3.5 Key Performance Indicators 25 Chapter 4 Results and Discussion 27 4.1 Characteristics of Flow-electrodes 27 4.1.1 Morphological Characteristic 27 4.1.2 Pore Characteristic 29 4.1.3 Rheological Characteristic 31 4.2 Effect of Applied Voltage on Desalination Performance 32 4.3 Effect of CNTs Loading on Desalination Performance 37 4.4 Effect of Initial NaCl Concentration on Desalination Performance 42 4.5 Comparison of Performance of FCDI 47 4.6 A Practical Study of Wastewater Desalination 52 Chapter 5 Conclusions and Suggestions 57 5.1 Conclusions 57 5.2 Suggestions 60 References 61 | |
| dc.language.iso | en | |
| dc.subject | 多通道電化學脫鹽 | zh_TW |
| dc.subject | 液流式電容去離子技術 | zh_TW |
| dc.subject | 奈米碳管 | zh_TW |
| dc.subject | 廢水脫鹽 | zh_TW |
| dc.subject | multichannel electrochemical desalination | en |
| dc.subject | wastewater desalination | en |
| dc.subject | carbon nanotubes | en |
| dc.subject | flow-electrode capacitive deionization | en |
| dc.title | 液流式電容去離子技術之奈米碳管/活性碳電極與其在廢水脫鹽之研析 | zh_TW |
| dc.title | Flow-electrode capacitive deionization with a carbon nanotubes/activated carbon suspension electrode for wastewater desalination | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 王大銘(Da-Ming Wang) | |
| dc.contributor.oralexamcommittee | 席行正(Hsin-Tsai Liu),彭晴玉(Chih-Yang Tseng) | |
| dc.subject.keyword | 液流式電容去離子技術,奈米碳管,廢水脫鹽,多通道電化學脫鹽, | zh_TW |
| dc.subject.keyword | flow-electrode capacitive deionization,carbon nanotubes,wastewater desalination,multichannel electrochemical desalination, | en |
| dc.relation.page | 66 | |
| dc.identifier.doi | 10.6342/NTU202102249 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2021-08-17 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 環境工程學研究所 | zh_TW |
| dc.date.embargo-lift | 2026-08-17 | - |
| 顯示於系所單位: | 環境工程學研究所 | |
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