奈米鈦管表面改質應用於
吸附不同水溶解度有機物可行性之研究

二氧化鈦因具有強大的氧化還原能力、化學穩定度高、無毒的特性，近年來陸續在許多領域都有極為廣泛的應用，製成奈米鈦管的型式將可有效提高其表面積。在目前已發表的文獻中，以水熱合成法方法製備奈米鈦管式是簡單及低成本之方法，除所製備出之奈米鈦管管徑較小且粗細長短分佈較均勻外，更重要的是，經由調整各合成參數，可適當改變樣品之微孔洞結構及組成以配合特殊應用之所需，因此已成為目前最常使用之奈米鈦管製備方法。本研究主要為藉由OTS、HDTMA、TEA改質奈米鈦管，並以此改質奈米鈦管針對不同水溶解度有機物吸附，藉由吸附等溫線所得之結果，探討所選擇有機物與改質奈米鈦管間的作用機制與可能之吸附量。吸附實驗所使用的有機物可分為三類包括(一)低水溶解度芳香族有機物：苯、甲苯、乙苯、鄰-二甲苯、丙基苯，(二) 高水溶解度脂肪族有機物：正戊醇、三氯甲烷，(三)高水溶解度芳香族有機物：酚、鄰-甲基酚；實驗的數據將經由吸附溫線形狀使用Freundlich等溫吸附模式與Langmuir等溫吸附模式，探討目標物對改質奈米鈦管之作用機制。實驗結果顯示奈米鈦管對於有機物的吸附效果皆優於二氧化鈦，可證實表面積為吸附效果的影響因子，而經改質後的奈米鈦管對低水溶解度有機物的吸附能力明顯增加，且對低水溶解度化合物吸附等溫線呈直線代表其主要作用機制為兩相分佈(partitioning)，脂肪族化合物中三氯甲烷的吸附等溫線類似於低水溶解度之有機物，但是在水溶解度較高的正戊醇對改質或未改質奈米鈦管之吸附等溫線均呈現凹面向下，代表奈米鈦管對戊醇具有高吸附能力且主要作用機制為吸附(adsorption)，改質與未改質奈米鈦管對酚、鄰-甲基酚皆具有高吸附能力，可以預期改質後的奈米鈦管將可有效吸附不同水溶解度有機物。

關鍵字

BTEX ； OTS ；水熱合成法；奈米鈦管；分佈作用；吸附

並列摘要

Titanium dioxide (TiO2) possesses the properties of high redox ability, high surface area, high chemical stability, low toxicity, so it has been widly applied to various industries in recent years. In order to increase TiO2 surface area, some researchers prepared titanate nanotubes(TNTs) using hydrothermal synthesis method, which is a simple and low cost method. Importantly, we could adjust the synthesis parameters to change the composition or structure to obtain more applications. The objective of this study is to measure surface properties of TNT modified by OTS、HDTMA and TEA and to discuss sorption capacities and mechanisms of modified TNT for different water solubility organic compounds. The test organic compounds are divided into three groups. The first group is less-soluble aromatic organic compounds: benzene, toluene, ethylbenzene, o-xylene, isopropyl benzene; the second group is relatively high-soluble aliphatic organic compounds: n-pentanol and trichloromethane; the third group is relatively high-soluble aromatic organic compounds: phenol, o-cresol. The obtained data regarding sorption are fitted using Freundlich model and Langmuir model. The results showed that the adsorption capacities relative to the test organic compounds of TNT are better than those of TiO2. Besides trichloromethane, organic compounds with the low water solubilities increased significantly after TNT was modified by OTS and HDTMA. The isotherms indicate linear relationship, suggesting that the primary mechanism is partition. The isotherm for pentanol is a concave downward curve, which indicates a high adsorption capacity. It is also found that modified-OTS TNT possesses high adsorption capacities for phenol and o-cresol. The modified TNT is considered to be an amphiphilic absorbent.

並列關鍵字

octadecyltrichlorosilane ； Organic Compound ； Sorption ； titanate nanotube

參考文獻

and characterisation of nanotubular titanates and titania, J. European

3. 劉育成，「氧化鈦奈米管擔體金屬觸媒之製備及特性分析」，博

electron microscopy observation of the structure of TiO2 nanotube and

Au/TiO2 nanotube catalyst, Surf. Interface Anal. Vol.37, pp.265-269

6. Andrzejewska, A., Krysztafkiewicz, A., Jesionowski, T., Adsorption of

國際替代計量

奈米鈦管表面改質應用於吸附不同水溶解度有機物可行性之研究

全文下載

主題瀏覽