改質二氧化鈦光觸媒應用於聚合物之光催化降解

Photocatalytic Degradation of Polymer Using Modified Titanium Dioxide

李依釗(Lee, Yi-Chao) ； 林文崇(Lin, Wen-Churng) ； 王彧宸(Wang, Yu-Chen)

《高雄應用科技大學工程科技學刊》 2卷1期 (2016/06) Pp. 7-16

https://doi.org/10.6553/JKTUET.2016.0201.02

摘要

本研究以乙醯丙酮（配位劑）與異丙氧基鈦在異丙醇溶劑中行配位反應，配製成烷氧溶液，再藉由溶膠─凝膠法合成具光催化性能之奈米級純二氧化鈦光觸媒粉末。銳鈦礦的二氧化鈦奈米顆粒表面可經由乙醯丙酮酸鐵（或稱戊二酮化鐵）錯合物修飾改質來提升其於聚合物中的分散性以及光催化活性。本研究分別針對使用修飾改質的二氧化鈦及未修飾改質的二氧化鈦將三種不同分子量的聚乙二醇光催化降解之性能做一廣泛性的研究比較。降解過程中，三種聚乙二醇的質量、分子量皆減少，分子量分布指數增加……等，這些符合降解特性的研究皆一併仔細的探討。

關鍵字

光催化降解 ； 聚乙二醇 ； 改質二氧化鈦 ； 乙醯丙酮酸鐵

並列摘要

Photocatalytic nanocrystalline neat TiO_2 powders were prepared from alkoxide solutions via the sol-gel method. The alkoxide solutions are formed by adding titanium isopropoxide and acetylacetone (as a chelating reagent) to isopropanol. The surface of anatase TiO_2 nanoparticles could be modified by ferric acetylacetonate complex Fe(acac)_3. This modification could improve the dispersion of TiO_2 in polymer and also the photocatalytic activity. The photodegradation of PEG catalyzed by modified TiO_2 are extensively studied in comparison with that by neat TiO_2. During the degradation, we could observe that the polymer loses its weight gradually, the molecular weight of the polymer decreases, and the molecular weight distribution index increases. The results accord with the degradation characters are also discussed in detail.

並列關鍵字

photocatalytic degradation ； polyethylene glycol ； modified titanium dioxide ； ferric acetylacetonate