利用碳氣凝膠紙對硝酸根離子進行電容去離子之研究

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李岳青(Yueh-Ching Li) 查詢紙本館藏

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環境工程研究所

論文名稱

利用碳氣凝膠紙對硝酸根離子進行電容去離子之研究
(The removal of nitrate via the capacitive deionization using carbon aerogel electrodes)

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摘要(中)

水資源問題在最近幾年已經漸漸的受到世界各地的關注，其中在人類生活會影響到的水質問題中，水中含氮物質像是硝酸根離子、亞硝酸根離子、氨氮等物質的減量或去除也將會是個重要的課題；本研究是透過以碳氣凝膠紙當作電極，並利用電容去離子機制去除硝酸根離子，並透過不同外加電壓以及不同的初始硝酸根離子濃度，瞭解外加電壓與離子濃度對碳氣凝膠紙的電容去離子系統有何影響。結果顯示，當初始硝酸根離子濃度為100 ppm且外加電壓從0.8 V上升到1.2 V時，硝酸根離子的電容去離子量（電容吸附和還原與脫附量的總合）從2.30 mg/g上升到5.18 mg/g，這是來自電容吸附量隨電壓提高而提高（0.43 mg/g上升到4.58 mg/g），而硝酸根離子還原與脫附量則沒有明顯變化。當初始硝酸根離子濃度從10 ppm提高到200 ppm且外加電壓為1.1 V或1.2 V時，電容吸附量從1.34 mg/g上升到4.48 mg/g，但當初始硝酸根離子濃度提高為500 ppm時，電容吸附量僅剩下2.62 mg/g。以本系統而言，在低初始濃度（10 ppm）時，去除硝酸根離子的效率可達50.53%。本系統的碳氣凝膠紙經過四次反覆充放電後，第四次的電容吸附量還能有第一次的90.9%左右。

摘要(英)

Reduction or removal of nitrate, nitrite, and ammonia in the water are important issues. This study focused on the removal of nitrate via the capacitive deionization using carbon aerogel electrodes. The influences of voltages and initial nitrate concentrations on the removal of nitrate and speciation of nitrogen are investigated. The results showed that the removal amount of nitrate increases from 2.30 mg/g to 5.18 mg/g when the applied voltage increased from 0.8 V to 1.2 V with the initial nitrate concentration of 100 ppm. These removal of nitrate may be contributed from the capacitance adsorption and the reduction of nitrate. The amount of nitrate removed by capacitance adsorption increased from 0.43 mg/g to 4.58 mg/g when the applied voltage increased from 0.8V to 1.2 V. At the meantime, the reduction and desorption nitrate did not affected by applying different voltage. The amount of nitrate removed by capacitance adsorption increased from 1.34 mg/g to 4.48 mg/g when the nitrate concentration increased from 10 ppm to 200 ppm, but decreased to 2.62 mg/g when nitrate concentration increased to 500 ppm. At low nitrate concentration (10 ppm), the removal efficiency reached 50.53%. And the capacitive adsorption ability was about 90.9% after four cycles.

關鍵字(中)

★ 碳氣凝膠紙
★ 電容去離子
★ 電容吸附
★ 硝酸根離子

關鍵字(英)

★ Capacitance adsorption
★ carbon aerogel
★ CDI
★ nitrate

論文目次

摘要 I
Abstract II
誌謝 III
圖目錄 VIII
表目錄 X
第一章前言 1
1.1. 研究緣起 1
1.2. 研究目的 2
1.3. 研究流程 3
第二章文獻回顧 5
2.1. 含氮溶液的處理方式 5
2.2. 電容 11
2.2.1電容器 11
2.2.2電雙層理論 12
2.2.3電容去離子原理 15
2.2.4電雙層重疊效應(double layer overlapping) 16
2.3. 碳氣凝膠紙 17
2.3.1 Carbon nanofoam 17
2.3.2碳氣凝膠紙 18
2.3.3碳氣凝膠紙的應用 19
第三章研究方法 28
3.1.實驗藥品與設備 28
3.1.1實驗藥品 28
3.1.2電容去離子系統架設 30
3.2.監控程序 34
3.3.電容去離子去除硝酸根離子 36
3.3.1非特定吸附 37
3.3.2電容吸附 38
3.3.2水質分析 39
第四章結果與討論 43
4.1.碳氣凝膠紙的非電容吸附 43
4.2.導電度與硝酸根離子濃度之相關性 45
4.3.電壓對去除硝酸根離子之影響 52
4.3.1電壓和總去除量之關係 52
4.3.2電壓和電容吸附量之關係 55
4.3.3電壓和氧化還原與脫附量之關係 57
4.4.初始濃度對去除效率之影響 61
4.4.1不同初始濃度對電容吸附量之影響 62
4.4.2初始濃度對NO3－還原與脫附量之影響 64
4.4.3初始濃度對去除效率之影響 66
4.5.含氮物質之宿命 69
4.6.再生實驗 75
第五章結論與建議 78
5.1.結論 78
5.2.建議 80
參考文獻 81

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指導教授

秦靜如(Ching-Ju Chin)

審核日期

2015-6-16

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