製備金奈米粒子/多壁奈米碳管修飾玻璃碳電極汞(Ⅱ)之循環伏安法分析

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姓名

莊惠婷(Huei-ting Jhuang) 查詢紙本館藏

畢業系所

環境工程研究所

論文名稱

製備金奈米粒子/多壁奈米碳管修飾玻璃碳電極汞(Ⅱ)之循環伏安法分析
(Determination of mercury(Ⅱ) using gold nanoparticles/ multi-walled carbon nanotubes composite modified glassy carbon electrode via cyclic voltammetry)

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摘要(中)

本研究運用化學還原法製備金奈米粒子/多壁奈米碳管複合材料修飾玻璃碳電極進行汞(Ⅱ)之循環伏安法分析，藉由調整汞(Ⅱ)溶液在不同pH條件及添加氯離子使汞(Ⅱ)主要物種分布改變下，瞭解修飾電極對汞(Ⅱ)主要物種改變之伏安法影響，最後瞭解修飾電極偵測水中不同濃度汞(Ⅱ)之還原電流值與濃度的相關性。由TEM、XRD、UV及EDS分析結果顯示利用化學還原法可有效製備金奈米粒子且與多壁奈米碳管複合狀況良好，而由電化學實驗可知修飾電極的反應面積皆大於玻璃碳電極，因此可得較大的偵測電流訊號值。當pH調整時，三種修飾電極皆會因汞(Ⅱ)主要物種分布改變而還原電位改變，但當氯離子添加時，僅10-GNP/MWCNTs修飾電極的偵測還原電位會偏移，最後修飾電極偵測不同濃度汞(Ⅱ)時，修飾電極的還原電流訊號值與汞(Ⅱ)濃度間(1 ppb ~ 10 ppb)的相關係數(R2)均有0.9以上是可信的線性關係，表示利用修飾電極伏安法分析汞(Ⅱ)是具有選擇性且可行的方法。

摘要(英)

The objective of this work was to prepare gold nanoparticles (GNP)/ multi-walled carbon nanotubes (MWCNTs) composite to modified glassy carbon electrode (GCE), which was used to analyze Hg (Ⅱ) by cyclic voltammetry (CV). It was found that modification via GNP/MWCNTs composite increased the active area. In order to investigate the influences of speciation on the reduction peak currents, CV was conducted at different solution pH and with addition of NaCl. When the solution pH was adjusted, the shift of the reduction peak of Hg was measured by all three modified electrodes. When NaCl was added, only the GCE electrode modified by 10-GNP/MWCNTs measured the shift of the reduction peak of Hg. These indicated that the CV by GNP/MWCNTs modified GCE electrodes can monitored the changes in speciation. Linear response between the reduction peak current and Hg concentration ranged from 1 ppb to 10 ppb has been found in all three modified electrodes This suggested that using GNP/MWCNTs modified GCE electrodes to analyze Hg concentration via cyclic voltammetry may be feasible.

關鍵字(中)

★ 金奈米顆粒
★ 物種分布
★ 化學還原法

關鍵字(英)

★ gold nanoparticles
★ mercury speciation
★ chemical reduction

論文目次

目錄
中文摘要 I
Abstract II
致謝 III
圖目錄 VII
表目錄 X
第一章前言 1
1.1研究緣起 1
1.2 研究目的 3
第二章文獻回顧 5
2.1電化學分析原理 5
2.1.1電化學反應系統 5
2.1.2循環伏安法 7
2.2 汞的基本介紹 11
2.2.1汞的基本特性 11
2.2.2汞的毒性與污染問題 12
2.2.3水體中汞之化學組成及其移動性 15
2.2.4汞的電化學分析 19
2.3金奈米粒子 22
2.3.1基本特性 22
2.3.2金屬奈米粒子製備-化學還原法 23
2.3.3金屬奈米粒子穩定化理論 23
2.4 奈米碳管電化學分析應用 26
2.4.1 奈米碳管表面改質對於電化學訊號的影響 26
2.4.2金屬/CNT複合材料電極 30
2.4.3奈米碳管電化學電極分析應用 32
第三章實驗方法 36
3.1實驗材料與設備 36
3.1.1實驗材料 36
3.1.2實驗設備 38
3.2實驗方法 40
3.2.1 奈米碳管之純化方法 42
3.2.2 GNPs/MWCNTs複合材料製備 43
3.2.3複合材料修飾電極與支持電解液之製備 45
3.2.4 伏安法分析 46
第四章結果與討論 49
4.1奈米碳管複合材料特性分析 49
4.1.1穿透式電子顯微鏡(TEM)分析 49
4.1.2 X-ray繞射(XRD)晶格結構分析 53
4.1.3 UV/Vis吸收光譜分析 56
4.1.4掃描電子顯微鏡(SEM)與能量分散光譜儀(EDS)分析 59
4.2奈米碳管複合材料修飾電極之電化學特性 61
4.2.1奈米碳管複合材料修飾電極之穩定性分析 61
4.2.2奈米碳管複合材料修飾電極之電化學感測特性分析 64
4.3修飾電極對不同汞離子狀態之伏安法分析 68
4.3.1 pH調整對汞離子伏安法分析之影響 68
4.3.2氯離子添加對汞離子伏安法分析之影響 74
4.4修飾電極對汞離子濃度變化之伏安法分析 78
第五章結論與建議 87
5.1結論 87
5.2建議 88
參考文獻 90

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指導教授

秦靜如(Ching-Ju Chin)

審核日期

2015-7-23

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