稀土泛指17種特性相似的金屬,較常用在作醫療設備之上,其中一種 (Promethium, Pm)為具放射性的物質。730Please respect copyright.PENANAkwEhzaRDTV
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雖然它們被稱為稀土,但事實上它們並不真的是如此稀有。730Please respect copyright.PENANAgjWzNv6Kp1
圖1圖中的圓點為各種稀土金屬蘊藏量,大部份與錫的含量相約,且遠高於大自然間的水銀含量。730Please respect copyright.PENANAbkixPVCTkO
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(圖2)近日有科學家發表文章(Ref2),從需要攝取稀土金屬才能運作的細菌中抽取一種名為Lanmodulin的蛋白質。730Please respect copyright.PENANArSpVU9CdOb
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這蛋白質有三大特性,730Please respect copyright.PENANA8RociUBK8X
1.能夠選擇性地黏上稀土金屬,不會黏上銅鋅鎂等非稀土金屬。730Please respect copyright.PENANAZa0Q7ffhy4
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2.攝氏95度下仍然正常運作。730Please respect copyright.PENANAA1p730ds4X
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3.pH2.5酸性環境仍能正常運作。730Please respect copyright.PENANAiKzt4NoWp8
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對比常用的一種金屬提取物質EDTA,Lanmodulin不但之對稀土金屬更具選擇性,而且親和力更高出5-10倍或以上。730Please respect copyright.PENANADoo4o3qLCN
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(圖3)電子廢物普遍會溶解在pH3.0的酸性環境使金屬呈離子狀態,有著Lanmodulin的幫助下,舊有的繁複及高能源消耗的提取稀土金屬辦法亦將能逐漸退出市場,各國亦能更有效從各電子儀器中回收稀土金屬,再進一步減少對中國的依賴。730Please respect copyright.PENANADFsk05GE7b
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc730Please respect copyright.PENANAUhjUWONVyl
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Ref1:https://pubmed.ncbi.nlm.nih.gov/30705185/730Please respect copyright.PENANAeuAJo2EiGI
Ref2:https://pubs.acs.org/doi/10.1021/acs.inorgchem.0c01303730Please respect copyright.PENANAxPTJcF3Twn