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標題: | 靜電噴塗碳黑/聚偏二氟乙烯製成具規模化之光熱響應薄膜 Electrohydrodynamic spritz of carbon black-infused PVDF for scalable photothermal membrane |
作者: | 周鼎勳 Ting-Hsun Chou |
指導教授: | 童國倫 Kuo-Lun Tung |
關鍵字: | 靜電噴塗,光熱奈米材料,光熱效應,光熱薄膜海水淡化, Electrospray deposition,Photothermal nanomaterials,Photothermal effect,Solar membrane desalination, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 近年來,潔淨且無盡的太陽能被全世界廣泛應用於發電或是海水淡化。奈米光子光熱薄膜蒸餾是一項新興由熱驅動的海水淡化技術,結合了光熱奈米材料表層加熱及傳統的薄膜蒸餾技術來達到高太陽能使用效率及高蒸汽冷凝轉換。然而,如何規模化且低成本的塗佈光熱層仍是一大挑戰。在本研究中,我們使用一步驟靜電噴塗技術來製備雙層碳黑/聚偏二氟乙烯薄膜。由於光熱層的改質,於一個光強度的條件下測試時可以達到57%產水量的提升以及高達72%的太陽能使用效率。此外,多功能的光熱層也同時賦予了薄膜表面高接觸角及低孔隙率的特性,因而於長效測試下無機鹽類結垢相比於未改質的薄膜得到趨緩。我們相信這個低成本、可規模化的光響應薄膜及新興的光熱海水淡化技術,對於能量及資源匱乏區域的水資源危機是非常具有前瞻性的技術。 Solar energy, with its inherent advantages of clean and renewable, has been used worldwide for generating electricity or desalting seawater. Nanophotonics-enabled solar membrane distillation (NESMD), an emerging thermal-driven process for seawater desalination, combines interfacial heating via photothermal nanomaterials with conventional membrane distillation technology to achieve high solar utilization efficiency as well as vapor-to-distillate conversion efficiency. However, it’s still a grand challenge thus far to develop a cost-effective and scalable membrane. Herein, a dual-layer carbon black (CB)/PVDF membrane was prepared based on a one-step electrospray method. With the introduction of a functional layer, photothermal effect was imparted to the bare membrane, thus significantly boosting the water production rate and solar utilization efficiency (SUE) when exposed to the artificial sunlight (~57% enhancement and 72% SUE under 1 sun). In addition to the outstanding photothermal property, this functional layer further enhanced surface hydrophobicity while decreased surface porosity, thus synergistically reducing the crystallization rate and physical binding of inorganic salts, which commonly resulted in the deterioration of membrane performance. Hence, when treating hypersaline feeds composed of 25 wt% of NaCl or 20 mM gypsum, the electrospray-engineered membrane demonstrated scaling mitigation behaviors during the long-term operation. This multifunctional coated membrane as well as a fast-growing solar desalination technology provide a promising solution to water crisis, especially in the off-grid area where energy and resources are both relatively insufficient. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90529 |
DOI: | 10.6342/NTU202302130 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 化學工程學系 |
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