以溶膠凝膠法製備酵母生物模板複合二氧化鈦之光催化活性研究

存在於環境中具有高度穩定性與不易被生物分解的多氯聯苯會藉由食物鏈或其他許多因素進入人體，並對皮膚、腦部和免疫系統等造成不可挽回的傷害。本研究希望能夠透過高級氧化處理中的光催化降解多氯聯苯，因此以溶膠凝膠法製備酵母生物模板複合TiO2，改變製備過程中的實驗因子pH (4、5、6)與鍛燒溫度 (450、500、550、600℃)，以亞甲基藍降解率找出最佳條件後，以此觸媒對多氯聯苯進行降解測試。以SEM、EDS、XRD、BET證實酵母不僅作為模板，亦能提供碳源摻雜進入TiO2，且隨著鍛燒溫度的升高結晶度越高、平均孔徑增大、表面積減少，而pH升高金紅石比例增加、平均孔徑增大、表面積減少。最後以最佳條件製備之觸媒(pH4、500℃)對多氯聯苯進行降解，其去除率為79%，對海洋發光菌的抑制率為63.36%。經由4次的持久性試驗，溶膠凝膠法製備酵母生物模板複合TiO2是一種可重複利用且符合環境與經濟有利的觸媒。

關鍵字

溶膠凝膠法；酵母菌；光催化降解；亞甲基藍；多氯聯苯

並列摘要

Polychlorinated biphenyls, which are highly stable and biodegradable in the environment, enter the human body through the food chain or many other factors and cause irreparable damage to the skin, brain, and immune system. This study was designed for the photocatalytic degradation of polychlorinated biphenyls that can be achieved through advanced oxidation treatment. Therefore, yeast bio-templated composite TiO2 was prepared by sol-gel method, and the experimental factors pH (4, 5 and 6) and the calcination temperatures(450, 500, 550 and 600 °C) in the preparation process were investigated. After determining the optimum conditions for the degradation of methylene blue, the degradation of polychlorinated biphenyls was tested using this criteria. SEM, EDS, XRD, and BET confirmed that yeast not only served as a template, but also provided a carbon source for doping into TiO2. As the calcination temperature increased, the crystallinity increased, the average pore size increased, the surface area decreased, and the pH increased. The proportion of rutile increases, the average pore size increases, and the surface area decreases. Finally, the catalyst (pH4, 500°C) prepared under optimal conditions degraded polychlorinated biphenyls with a removal rate of 79% and an inhibition rate of 63.36% for marine photoluminescent bacteria. Through four tests of persistence, the yeast biotemplate TiO2 prepared by sol-gel method is a reusable and environmentally friendly catalyst.