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：Elimination of bromate from water using aluminum beverage cans via catalytic reduction and adsorption
中文：使用飲料鋁罐通過催化還原和吸附從水中消除溴酸鹽
期刊名稱 Journal of Colloid and Interface Science
發表年份,卷數,起迄頁數 2018, 532, 416–425
作者 Yi-Ting Chiu, Pei-Yu Lee, Thomas Wi-Afedzi, Jechan Lee*, Kun-Yi Andrew Lin*(林坤儀)
DOI 10.1016/j.jcis.2018.07.112
中文摘要 雖然零價鋁（ZVAl）是一種很有潛力的還原劑，它可以從水中去除溴酸鹽，但ZVAl卻常從試劑級鋁獲得。然而飲料鋁罐是最常見的鋁廢料，可方便地用於製備ZVAl，因此本研究使用飲料鋁罐作為一個豐富且易於獲得的鋁源用於去除水中溴酸鹽。由於鋁易於氧化形成氧化鋁，鋁罐（ACP）用HCl預處理以除去氧化物層可得VA1，研究可知非酸處理的ACP對溴酸鹽的去除是無效的，但酸處理的ACP成功的消除了水中的溴酸鹽。 ACP消除溴酸鹽是由於溴酸鹽吸附到ACP表面導致溴酸鹽還原為溴化物和ACP的反應位點，另外在較高溫度和較低pH值下，ACP消除溴酸鹽的速度也更快；另一方面發現草酸不僅在動力學上而且在還原成溴化物時可以促進溴酸鹽的去除，原因在於草酸抑制了鈍化層。ACP也可以重複使用，酸洗再生可以讓用過的ACP恢復其反應位點以消除溴酸鹽。本研究成功的證明了飲料鋁罐的價值，以減輕有毒的溴酸鹽，本次發現為開發飲料鋁罐控制水中污染物提供了相當有用的訊息和探討。
英文摘要 While zero valent aluminum (ZVAl) is a promising reductant for eliminating bromate from water, ZVAl is typically obtained from reagent grade aluminum. As used aluminum beverage can is the most common aluminum waste, it can be conveniently used to prepare ZVAl. Thus, in this study aluminum beverage cans are employed for the first time as a plentiful and easily accessible aluminum source to afford ZVAl for eliminating bromate from water. As aluminum is easily oxidized to form aluminum oxide, aluminum can pieces (ACPs) are pre-treated with HCl for removing the oxide layer to afford ZVAl. While non-acid-treated ACP is ineffective to remove bromate, the acid-treated ACP successfully eliminates bromate from water completely. Bromate elimination by ACP is attributed to reduction of bromate to bromide by the reactive sites of ACP and adsorption of bromate to the surface of ACP. Bromate elimination by ACP also proceeds much faster at higher temperatures and low pH values, while the alkaline condition causes serious negative effects on bromate elimination. Besides, oxalic acid is found to facilitate bromate elimination not only on the kinetics but also reduction to bromide because the passivation layer is suppressed in the presence of oxalic acid. ACP could also be reused and the acid-washing regeneration could enable used ACP to restore its reactive sites for bromate elimination. This study successfully demonstrates the valorization of aluminum beverage cans for mitigating the toxic bromate and the findings here provide useful information and insights to develop aluminum beverage cans for controlling pollutants in water.