| 摘要: | 藥物與個人保健用品(pharmaceuticals personal care products, PPCPs)是近年來備受矚目的新興污染物之一。由於在環境中不易分解，人們逐漸意識到其危害性，因此需開發能夠有效去除PPCPs的技術。氫氧自由基(Hydroxyl Radical,·OH)是一種具有高活性和破壞力的強氧化劑，可以將多數有機物氧化成簡單的分子。故本研究使用靜電紡絲技術，製備二氧化鈦/奈米碳管/碳奈米纖維(titanium dioxide/carbon nanotubes/carbon nanofiber,TiO2-CNT-CF)，透過二氧化鈦之電催化產生氫氧自由基，加上碳纖維之吸附效果，以達到更好地去除水中止痛藥的目的。
根據本研究結果顯示，製成的CNT-CF、TiO2-CF和TiO2‑CNT-CF電極在乙醯胺酚和阿斯匹靈溶液中皆有去除的能力。在乙醯胺酚溶液中，CNT‑CF、TiO2-CF和TiO2‑CNT-CF電極之去除率分別為16.67%、7.03%和19.08%。在阿斯匹靈溶液中，CNT-CF、TiO2-CF和TiO2‑CNT-CF電極之去除率分別為15.77%、0.58%和9.42%。由於CNT-CF擁有最高的比表面積，能夠儲存較多的分子，其作用原理主要以電吸附為主，另外因部分單壁奈米碳管可能具有催化之能力，能夠改善去除效果。TiO2-CF因電紡二氧化鈦於碳纖維上，覆蓋原先製成纖維的表面孔洞，使其比表面積較CF低為135.60 m2/g。但根據氫氧自由基之檢測結果，可以觀察到TiO2-CF會產生氫氧自由基，表示該電極仍然具有部分催化能力，能夠與有機物作用。TiO2‑CNT-CF電極因電紡二氧化鈦之過程，使其比表面積低於原始的CNT‑CF，僅為194.40 m2/g。但因材料中含有能夠產生氫氧自由基的二氧化鈦，同時透過添加奈米碳管改善材料導電度。因此，使TiO2‑CNT-CF擁有比TiO2-CF更好的有機物去除效果。;Pharmaceuticals and personal care products (PPCPs) have become one of the emerging pollutants in recent years. Because PPCP are difficult to degrade, people have gradually aware of their harmful effects, leading to the need for the development of effective techniques to remove PPCPs. Hydroxyl radicals(·OH) are highly reactive and destructive oxidants capable of oxidizing most organic compounds into simpler molecules. Therefore, in this study, electrospinning technology was employed to prepare composite titanium dioxide (TiO2)/carbon nanotubes (CNT)/carbon nanofibers (CF) materials.
According to the results, the fabricated CNT-CF, TiO2-CF, and TiO2-CNT-CF electrodes demonstrated the ability to remove acetaminophen and aspirin from the solution. In the acetaminophen solution, the removal effiency of CNT-CF, TiO2 CF, and TiO2-CNT-CF electrodes were 16.67%, 7.03%, and 19.08%, respectively. The removal of aspirin by CNT-CF, TiO2‑CF, and TiO2-CNT-CF electrodes were 15.77%, 0.58%, and 9.42%, respectively. Since CNT-CF possessed the highest specific surface area, it could remove more molecules, primarily through electrosorption. Additionally, due to the potential catalytic properties of CNT, they could enhance the removal efficiency. Electrospinning of TiO2 onto carbon fibers covered the pores of CF, resulting in a lower specific surface area compared to CF. The analysis showed that TiO2-CF can still generate hydroxyl radicals, indicating that the electrode still possessed the catalytic capability to interact with organic substances. Despite the lower specific surface area of TiO2-CNT-CF electrode, due to the generation of hydroxyl radicals by TiO2 and enhanced conductivity by CNT, TiO2-CNT-CF exhibited better organic pollutant removal ability compared to TiO2-CF. |
