| 摘要: | 鄰苯二甲酸酯類 (phthalates esters)為常用之塑化劑，已被確認為環境荷爾蒙的一種，在台灣許多水域中以及下水污泥中均已發現鄰苯二甲酸酯類的存在。奈米碳管因具有高比表面積與微孔體積，吸附反應時間快，所以被認為是良好的吸附材料。奈米碳管對苯環分子的吸附機制以π−π鍵為主，而氫鍵、極性、靜電力、官能基的空間障礙等均會對奈米碳管之吸附能力造成影響。目前關於官能基對奈米碳管吸附苯環物質之機制影響的研究中，多針對OH 基、苯環、Cl 及CH3，對於酸酯類官能基對奈米碳管吸附能力之影響，尚未有有系統之研究探討。本計畫擬選用數種鄰苯二甲酸酯為吸附質，進行奈米碳管對於具酸酯類官能基之苯環物質的吸附，除瞭解以奈米碳管吸附處理鄰苯二甲酸酯之成效外，並探討酯類官能基對奈米碳管吸附能力之影響，以X 光電子能譜、電化學分析儀、以及掃瞄式穿隧顯微鏡分析奈米碳管與鄰苯二甲酸酯之鍵結方式，以判斷其吸附機制。本研究之成果預計可(1)對於利用奈米碳管做為吸附材料、感測器等用途時，其機制與反應性將可提供進一步的幫助，(2)可瞭解奈米碳管處理鄰苯二甲酸酯類環境荷爾蒙物質之能力，(3)對奈米碳管若排放至自然水體中，與水體中類似物質之反應性有一初步瞭解。 ; Phthalate esters have been recognized as endocrine disruptors. It has been found in many waters and wastewater sludge in Taiwan. Carbon nanotubes (CNTs) have been considered as good adsorbent due to its high surface area, large pore volume, and fast adsorption equilibrium time. The major mechanisms of the adsorption of organic molecules containing benzene ring is already identified as π−π interactions between the benzene ring and the carbon ring on the CNTs. Besides π−π interactions, hydrogen bonding, electrostatic forces, polarity, and steric effects of the functional groups on either the surface of CNTs or the benzene ring will also affect the adsorption ability of CNTs. Most of the works studied on the influences of the functional groups on the adsorption of organic molecules containing benzene rings have considered OH, benzene ring, Cl, and CH3. The influences of ester on the adsorption by CNTs have not been examined systematically while there are great amount of compounds in water contains the ester groups. In this work, it is proposed to study the adsorption of phthalate esters by SWCNTs to investigate the influences of ester functional groups on the adsorption ability of CNTs and on the interactions between the benzene rings and the CNTs. Batch adsorption dynamic and equilibrium experiment will be conducted to derive the adsorption dynamic model and the adsorption isotherms. X-ray photoelectron spectroscopy, voltammetry (CV curve), and scanning tunneling microscopy will be used to analyze the bonding energy, the electron density, conductivity, resistances, and etc. to understand the interactions between phthalates esters and CNTs and to further discuss the influences of the ester functional groups on the adsorption of CNTs on phthalate esters. The results of this work will provide better understanding on the fate of CNTs in the environment, the proper adsorption conditions of CNTs, and the application of CNTs in the development of chemical sensors. ; 研究期間 9808 ~ 9907 |
