- 學位論文
水熱合成二氧化矽與二氧化鋯/二氧化矽奈米複合結構於油中磷脂移除之應用
Hydrothermal Synthesis of SiO2 and Composite ZrO2/SiO2 Nanostructures for Phospholipid Removal in Oil Solution
摘要
中文摘要 本研究利用水熱法以矽酸鈉(Sodium silicate)及酸為反應物，藉由調整矽酸鈉比例及酸的濃度，在不同pH值下製備出三種不同結構之二氧化矽，分別為:片狀結構、中空球結構以及棒狀結構，並探討此三種結構對油脂中磷脂吸附之應用，實驗結果發現，二氧化矽的磷脂吸附效果:片狀結構>中空球結構>棒狀結構，而其吸附量最高者片狀結構最大吸附量為90 mg/g，為了提升吸附效果，我們試著摻入其他材料來提高吸附量，於過去文獻中，由於奈米級二氧化鋯(Zirconium dioxide)顆粒小、屬於電負度差值大的金屬氧化物，是不錯的磷脂吸附材料，但是奈米顆粒本身團聚現象嚴重，使比表面積不如預期，導致磷脂吸附效果變差，故本實驗加入二氧化鋯奈米粒子於二氧化矽中，使其成長於材料表面上，藉此改善二氧化鋯團聚現象並提升其比表面積，達到有效吸附磷脂的目的。而加入二氧化鋯奈米顆粒後，形成的三種二氧化鋯/二氧化矽奈米複合材料吸附效果皆有明顯提升，其原因為比表面積的大幅增加，二氧化鋯/二氧化矽片狀複合結構比表面積可達448.36 mg/g，較二氧化鋯奈米顆粒高達一倍之多，有效提升磷脂吸附效能，其吸附效果最佳為二氧化鋯/二氧化矽片狀複合結構，在等溫吸附實驗中，磷脂吸附量最高可達420 mg/g。
並列摘要
Abstract In this study, three different SiO2 structures were prepared using sodium silicate and acid reactants via a hydrothermal method. By adjusting the ratio of sodium silicate and acid concentration, at different pH value, plate, hollow sphere and rod structure were synthesized. These different structures were further applied in phospholipid removal from oil. From phospholipids adsorption experiment, The SiO2 plate structures are with largest phospholipids adsorption capacity compared to hollow sphere and rod structures. The highest adsorption capacity of SiO2 plate structures in the adsorption isotherm is 90 mg/g. From the previous literatures, ZrO2 nanoparticles are strong Lewis acid materials, revealing the better phospholipid adsorption capacity in oil solution. However, ZrO2 nanoparticles easily aggregated to decrease their surface area in oil solution, resulting in the decrease in the phospholipid adsorption capacity. To increase phospholipids adsorption capacity, ZrO2 nanoparticles are tried to coat on the different SiO2 structures to form the ZrO2/SiO2 composite structures. The specific surface area of the ZrO2/ SiO2 plate structures is up to 448.36 mg/g, which is double than that of ZrO2 nanoparticles. As a result, the ZrO2/SiO2 plate structures possess the highest phospholipids adsorption capacity with 420 mg/g compared to the other two ZrO2/SiO2 composites. Consequently, the as-prepared ZrO2/SiO2 plate structures have large potential in industrial applications such as phospholipid removal in oil solution.
參考文獻
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