循環農業：農業廢棄物高價值化【環境工程學系林坤儀副教授】

論文篇名 英文：Cobalt ferrite nanoparticles supported on electrospun carbon fiber as a magnetic heterogeneous catalyst for activating peroxymonosulfate
中文：鈷鐵氧化物奈米粒子負載在電紡碳纖維上作為用於活化過氧單硫酸鹽的磁性非均相催化劑
期刊名稱 Chemosphere
發表年份,卷數,起迄頁數 2018, 208, 502–511
作者 Kun-Yi Andrew Lin*(林坤儀), Ming-Tong Yang, Jyun-Ting Lin, Yunchen Du*
DOI 10.1016/j.chemosphere.2018.05.127
中文摘要 鈷鐵氧化物（CF）奈米顆粒（NP）具有強磁性有利於回收且展現極高之活化過一硫酸氫鉀的催化活性。然而由於水中的CF NPs易於聚集，因此必須將CF NPs固定在基材上。雖然碳質材料作為基材具有多項優勢，但用於PMS活化的碳載支持CF的研究僅限於基於石墨烯的CF，然而，其需要復雜的製備方案。因此透過直接製備碳載CF之材料仍然非常需要，本研究旨在採用靜電紡絲技術透過碳化電紡CF嵌入聚丙烯腈（PAN）纖維來製備碳載CF。碳化後，CF-PAN纖維轉化為CF嵌入式碳納米纖維（CF @ CNF），其中含有均勻分佈的CF NPs，具有高磁性和穩定的碳載體，使CF @ CNF成為激活PMS的極具潛力之催化劑。當使用莧菜紅脫色用作測試反應時，CF @ CNF能夠激活PMS以產生硫酸根自由基於水中使莧菜紅脫色。 CF @ CNF-PMS的莧菜紅脫色也在升高的溫度下顯著促進，並且在弱酸性條件下增強。 CF @ CNF即使在鹽和表面活性劑存在下也能有效激活PMS，並且可在多個循環中重複使用。與其他報導的催化劑相比，CF @ CNF對莧菜脫色也顯示出低得多的Ea值（35.8kJ / mol）。這些特徵證實CF @ CNF是激活PMS的有利且方便的催化劑。
英文摘要 Cobalt ferrite (CF) nanoparticle (NP) represents a promising alternative to Co3O4 NP for peroxymonosulfate (PMS) activation in view of its strong magnetism for easy recovery. As CF NPs in water are prone to agglomerate, a few attempts have been made to immobilize CF NPs on substrates. While carbonaceous supports are more favorable owing to their earth abundancy, the study of carbon-supported CF for PMS activation is limited to graphene-based CF, which, however, requires complicated protocols to prepare. As carbon-supported CF, by straightforward preparation, is still greatly desired, this study aims to employ electrospinning techniques for preparing carbon-supported CF by carbonizing an electrospun CF-embedded polyacrylonitrile (PAN) fiber. After carbonization, the CF-PAN fiber is converted into CF-embedded carbon nanofiber (CF@CNF), which contains well distributed CF NPs, high magnetism and stable carbon support, making CF@CNF a highly promising catalyst for activating PMS. As amaranth decolorization is used as a model reaction, CF@CNF is able to activate PMS for generating sulfate radicals and then decolorize amaranth in water. Amaranth decolorization by CF@CNF-PMS is also substantially facilitated at elevated temperature, and enhanced under the weakly acidic condition. CF@CNF also remains effective to activate PMS even in the presence of salts and surfactants, and re-usable over multiple cycles. Compared to other reported catalysts, CF@CNF also exhibited a much lower Ea value (35.8 kJ/mol) for amaranth decolorization. These features validate that CF@CNF is an advantageous and convenient catalyst for activating PMS.