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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 駱尚廉(Shang-Lien Lo) | |
| dc.contributor.author | Shih-Chia Chang | en |
| dc.contributor.author | 張世佳 | zh_TW |
| dc.date.accessioned | 2021-06-13T15:37:17Z | - |
| dc.date.available | 2008-09-09 | |
| dc.date.copyright | 2008-07-17 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-10 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37658 | - |
| dc.description.abstract | 全氟化合物因具有環境持久性、生物累積性及對人體有潛在的毒性，且其碳-氟鍵結(C-F)具高穩定性，無法藉由自然程序破壞，必須研發出有效的方法，使其降解為二氧化碳(CO2)及氟離子(F-)。本研究以全氟辛酸(perfluorooctanoic acid, PFOA)做為主要污染物，以微波水熱法加速過硫酸鹽氧化PFOA，另選擇零價鐵作為過硫酸鹽的活化劑，藉由零價鐵解離出亞鐵離子活化過硫酸鹽，同樣在微波場下反應，加速PFOA降解成最終產物。實驗在不同溫度、pH值、過硫酸鹽加藥量及零價鐵加藥量下之PFOA及全氟辛烷磺酸(perfluorooctane sulphonate, PFOS) 去除效率。實驗結果顯示，藉由微波加熱的協助可加快過硫酸鹽去除PFOA的速率，在PS/MW系統130℃下，當pH值從11降到2，PFOA去除率從0%增加到84.3%；過硫酸鹽濃度對PFOA去除的影響，以PFOA的假一階反應常數(kobs)做比較，過硫酸鹽5 mM及10 mM的kobs值分別是1mM的1.29倍及4.31倍；溫度的影響在過硫酸鹽5 mM、pH3、140℃的條件下反應1小時後，PFOA去除率超過98%；而過硫酸鹽結合零價鐵粉系統下(PS /ZVI/MW)更能提升PFOA的去除效率，比較MW、PS/MW及PS/MW/ZVI系統的反應動力常數分別為 4.0×10-3 h-1，9.7 ×10-2 h-1及2.3×102 M-1h-1(二階反應動力)。最佳條件應用於PFOS上結果顯示，於PS/ZVI/MW其在反應時間30分鐘內PFOS去除率可達75.0%，具有實際的應用性。 | zh_TW |
| dc.description.abstract | The perfluorinated compounds (PFCs) have the environmental persistence, bioaccumulation, and potential toxicity to humans. The PFCs has high stability that ascribed to their C-F bonds, have no known natural decomposition processes. Therefore, developing effective methods to degrade PFCs becomes F- and CO2 is important. Perfluorooctanoic acid (PFOA) is the main study pollutants of this research. With the methods of oxidizing PFCAs by using persulfate under microwave field, which increasing PFOA and perfluorooctane sulphonate (PFOS) decomposition rate. And we choose the activator as the persulfate of zero valent iron utilize it from ferrous ion, which could activate persulfate to from sulfate radicals. This study discusse the PFOA decomposition at different concentration of PS and dosage of ZVI under different temperature and pH. According to the experimental results, the PS/MW processes of degradation efficiency of the PFOA at 130℃. PFOA decomposition increased from 0% to 84.3% while pH value decreased from 11 to 2 for a half hour. The influence of persulfate concentration, the pseudo first-order rate constants (k) is 1.29 times higher at 5 mM and 4.31 times higher at 10 mM than at 1 mM. Within 1 hours, more than 98% of PFOA was decomposed at 140℃ with 5 mM persulfate. And the PS/ZVI/MW processes more effective degraded PFOA. The k value of MW, PS/MW, PS/ZVI/MW processes were 4.0×10-3 h-1, 9.7×10-2 h-1 and 2.3×102 M-1h-1(second order), respectively. The best optimum condition applies on PFOS. The result demonstrated that, more than 75.0% of PFOS was decomposed within 30 minute at PS/ZVI/MW processes. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T15:37:17Z (GMT). No. of bitstreams: 1 ntu-97-R95541106-1.pdf: 1270818 bytes, checksum: 7d1a2faab7018c7f7dc710db17554597 (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | 中文摘要 I
Abstract II 目 錄 III 圖 目 錄 VI 表 目 錄 VIII 第一章 緒 論 1 1.1 研究緣起 1 1.2 研究目的 2 1.3 研究內容 3 第二章 文獻回顧 4 2.1 PFCS之污染及危害 4 2.1.1 物理特性 4 2.1.2 用途及數量 5 2.1.3 如何進入環境 9 2.1.4 環境移轉性 10 2.1.5 分布於城市濃度 11 2.1.6 全氟化合物之危害性 12 2.1.6.1 持久性 12 2.1.6.2 生物蓄積性 12 2.2我國全氟化合物的現況 13 2.3 全氟化合物處理技術之比較 14 2.3.1 光化學氧化法 14 2.3.2 超音波氧化法 14 2.3.3 活性碳吸附法 15 2.4 化學氧化法反應 16 2.4.1 氧化劑 16 2.4.2 過錳酸鹽 16 2.4.3 Fenton試劑 17 2.4.4 過硫酸鹽 18 2.4.5 硫酸根自由基之化學特性 20 2.5 零價鐵反應理論 23 2.5.1 零價鐵還原脫氯之基本原理 23 2.5.2零價鐵影響因子之探討 24 2.5.2.1 鐵粉表面積 24 2.5.2.2 pH值 25 2.6 微波理論 25 2.6.1 微波原理 25 2.6.2溶液於微波場之反應 26 2.6.3 固相樣品於微波場之反應 28 2.6.4 影響微波加熱的因子 28 2.6.5 微波加熱的特性 30 第三章 研究方法 31 3.1 研究架構 31 3.2 實驗分析方法 32 3.3 PFCAS降解實驗 38 3.3.1 實驗裝置及操控流程 38 3.3.2 背景實驗 39 3.3.2.1 直接微波加熱試驗 39 3.3.2.2 零價鐵吸附動力試驗 39 3.3.3 實驗操作參數 39 3.3.3.1 pH試驗 39 3.3.3.2 溫度試驗 40 3.3.3.3 過硫酸鹽劑量試驗 40 3.3.3.4 催化劑最佳添加量試驗 40 第四章 結果與討論 41 4.1過硫酸鹽氧化PFOA反應之操作條件探求 41 4.1.1 pH值影響 41 4.1.2 不同過硫酸鹽濃度之反應動力 45 4.1.3 溫度影響之反應動力 48 4.2 添加零價鐵之過硫酸鹽氧化PFOA反應 52 4.2.1零價鐵粉之吸附動力 52 4.2.2 零價鐵粉添加量 53 4.2.3 過硫酸鹽與零價鐵粉添加比例 53 4.2.4 鐵離子對PFOA氧化之影響 59 4.3 過硫酸鹽氧化PFOA之反應機制 63 4.3.1中間產物 65 4.3.2質量平衡 67 4.4 過硫酸鹽氧化PFOS之衍生試驗 68 4.4.1零價鐵粉之吸附動力 68 4.4.2 PS/ZVI系統下PFOS之動力實驗 68 第五章 結論與建議 70 5.1 結論 70 5.2 建議 72 第六章 參考文獻 73 附 錄 81 | |
| dc.language.iso | zh-TW | |
| dc.subject | 零價鐵 | zh_TW |
| dc.subject | 微波 | zh_TW |
| dc.subject | 全氟辛酸 | zh_TW |
| dc.subject | 過硫酸鹽 | zh_TW |
| dc.subject | 酸根自由基 | zh_TW |
| dc.subject | zero valent iron | en |
| dc.subject | perfluorooctanoic acid | en |
| dc.subject | persulfate | en |
| dc.subject | microwave | en |
| dc.subject | sulfate radical | en |
| dc.title | 以微波水熱法輔助過硫酸鹽降解水中全氟辛酸 | zh_TW |
| dc.title | Decomposition of Perfluorooctanoic Acid (PFOA) in Water by Persulfate-induced via Microwave Irradiation | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林郁真,劉雅瑄 | |
| dc.subject.keyword | 微波,全氟辛酸,過硫酸鹽,硫,酸根自由基,零價鐵, | zh_TW |
| dc.subject.keyword | microwave,perfluorooctanoic acid,persulfate,sulfate radical,zero valent iron, | en |
| dc.relation.page | 95 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-07-10 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 環境工程學研究所 | zh_TW |
| 顯示於系所單位： | 環境工程學研究所 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-97-1.pdf 未授權公開取用 | 1.24 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。