靜電紡絲製備碳纖維電極應用於電容去離子系統;Preparation of carbonaceous fiber for capacitive deionization by electrospinning

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Title:	靜電紡絲製備碳纖維電極應用於電容去離子系統;Preparation of carbonaceous fiber for capacitive deionization by electrospinning
Authors:	白芸綺;Pai, Yun-Chi
Contributors:	環境工程研究所
Keywords:	電容去離子;靜電紡絲;碳纖維改質;氫氧化鉀;二氧化鈦;capacitive deionization;electrospinning;carbon fiber modification;KOH;TiO2
Date:	2021-10-26
Issue Date:	2021-12-07 13:38:02 (UTC+8)
Publisher:	國立中央大學
Abstract:	電容去離子(CDI)是能處理不同鹽含量的微鹽水的先進水處理的技術。它有很多優點，在施加低電壓形成電極表面電雙層，離子進行電吸附，去除電壓後進行脫附，本研究利用靜電紡絲製備碳纖維(carbon fiber, CF)探討碳纖維電極的性能。靜電紡絲是一種用於生產微米直徑聚合物纖維的技術。當在進行後續用途時，電紡纖維的特性就很重要，而電紡的操作參數對纖維本身的性能影響很大，例如電紡施加電壓、前驅液濃度和進料速度等。聚丙烯?(PAN)是眾所周知的聚合物，具有良好的穩定性和機械性能，已廣泛用於生產碳纖維。故本研究以PAN作為前驅物分別施加不同電紡電壓15、17和22 kV生產碳纖維，其為施加22kV時，碳纖維電極的電化學性能最佳，此外再以CF-22-1進行後續的改質。分別以氫氧化鉀作為活化藥劑以及在碳纖維上複合二氧化鈦，接著對NaCl水樣進行去離子實驗，結果表明，經過氫氧化鉀修飾後的電極(K-CF-22)，具有最佳的吸附量。經SEM測定，電極表面的型態顯示，K-CF-22明顯增加表面的粗糙度，與BET結果一致，比表面積為643.01 m2/g增加至原來的2.5倍且總孔體積為0.061 cm3/g是全數樣品裡最高的。;Capacitive deionization (CDI) is an advanced water treatment technology that can process micro-saline water. The electrical double layer (EDL) is formed by applying low voltage. When the voltage is removed, the ions on the electrode are desorbed. In this study was used electrospinning to prepare carbon fiber (CF) to explore the performance of CF electrodes. Electrospinning can produce micron diameter polymer fibers. The operating parameters of electrospinning have a great influence on the performance of CF. In this study, PAN was used as the precursor to produce CFs with different electrospinning voltages of 15, 17 and 22 kV. When the electrospinning voltage was 22 kV (CF-22-1), the electrochemical performance of the CF electrode is the best. In addition, CF-22-1 is used for subsequent modification. KOH was used as the activating agent and TiO2 was deposited on CFs. The deionization efficiency showed that CF modified by KOH (K-CF-22) had the best adsorption capacity. The surface morphology of the K-CF-22 significantly increased the surface roughness. The specific surface area was 643.01 m2/g and the total pore volume was 0.061 cm3/g.
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Electronic Thesis & Dissertation

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