新穎材料農業：友善環境農業新穎材料研發與安全評估【土壤環境科學系/劉雨庭副教授/優聘教師】
| 論文篇名 | 英文：Oxidative removal of thallium(I) using Al beverage can waste with amendments of Fe: Tl speciation and removal mechanisms 中文：利用飲料鋁與鐵的添加來氧化移除一價鉈：鉈物種分析與移除機制 |
| 期刊名稱 | Chemical Engineering Journal |
| 發表年份,卷數,起迄頁數 | 2021, 427, 130846 |
| 作者 | Chen, Kai-Yue; Tzou, Yu-Min(鄒裕民); Hsu, Liang-Ching; Guo,Jun-Wei; Cho, Yen-Lin; Teah, Heng-Yi; Hsieh, Yi-Cheng; Liu, Yu-Ting(劉雨庭)* |
| DOI | 10.1016/j.cej.2021.130846 |
| 中文摘要 | 越來越多的鉈汙染喚起需要有效整治方法的急迫性，由於三價鉈的低溶解度，可利用氧化沉澱的方式來移除一價鉈。本研究利用回收的飲料鋁罐製作成的鋁粉，代替零價鋁進行類Fenton反應來氧化一價鉈，接著利用在pH 9.5的鹼化反應使三價鉈沉澱。除了鋁粉之外，本研究也加入二價及三價鐵，並從固相與液相中的鉈物種分布，來建立一價鉈的移除機制。研究結果顯示，雖然添加二價及三價鐵可促進一價鉈氧化，使其氧化程度高於純鋁粉系統，但是卻不利鉈在鹼化反應後的移除。當鉈的移除率在鋁粉/二價鐵/三價鐵系統中可達92%時，純鋁粉系統中的移除率卻可高達99.8%。鉈的XANES數據顯示，雖然在所有測試的實驗系統中，三價鉈是鹼化反應後固相上的主要物種(92-95%)，其中在純鋁粉系統中是以Tl2O3為主，但是在添加二價及三價鐵的系統中，三價鉈主要是以吸附在鋁(氫)氧化物上的自由離子態為主。這樣吸附型態的三價鉈容易被還原，接著溶出，解釋了在二價及三價鐵系統中較低的鉈移除率。本研究證實了回收再利用鋁粉與目前一些需要高耗能、高汙染製作的奈米複合物有可相比的鉈移除效果，使用鋁粉來進行鉈復育可在汙染物移除與資源回收再利用間達到雙贏。 |
| 英文摘要 | The emerging occurrence of thallium (Tl) in environments arouses the imposition of effective technology for its remediation. Due to the low solubility of Tl(III), the oxidation-precipitation of Tl(I) is considered as an promising removal method. Here, we recycled Al beverage can powder (AlCP) as the substitute for zero-valent Al to conduct the Fenton-like reaction for Tl(I) oxidation and subsequently induced the Tl(III) precipitation via the alkalinization at pH 9.5. The Tl(I) removal mechanisms in AlCP systems with amendments of Fe(III) or Fe(II) were determined in relation to its speciation for both dissolved and solid phases. Results showed that although additions of Fe(III)/Fe(II) prompted the Tl(I) oxidation as compared with the pure AlCP system, they were detrimental to the Tl removal upon the alkalinization. While the greatest removal efficiency was ~ 92% in AlCP/Fe (III)/Fe(II) systems, up to 99.8% of total Tl could be removed from the pure AlCP system. The Tl-XANES data indicated that although Tl(III) dominated the Tl inventory (92 – 95%) on all solids collected upon the alkalinization, it preferred to precipitate as stable Tl2O3 in pure AlCP system but as labile Tl(III) in AlCP/Fe(III)/Fe(II) systems, which might sorb on precipitated Al (hydr)oxides. Such sorbed Tl(III) is subject to reduction and the further dissolution, accounting for the lower removal efficiency for Tl in the presence of Fe(III)/Fe(II). This study corroborated the comparable Tl(I) removal efficiency of AlCP to that of state-of-the-art (nano)composites, providing a niche opportunity to give consideration to both interests in hazard remediation and the waste reduction/reuse. |
| 發表成果與本中心研究主題相關性 | 使用廢棄飲料鋁罐移除新興無機汙染物，可在汙染物移除與資源回收再利用中雙贏，確保土壤與水資源健康，達到環境永續。 |
