Repurposing bacterial extracellular matrix for selective and differential abstraction of rare earth elements,Green Chemistry

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Repurposing bacterial extracellular matrix for selective and differential abstraction of rare earth elements
Green Chemistry ( IF 9.3 ) Pub Date : 2018-06-26 , DOI: 10.1039/c8gc01355a
Pei Kun R. Tay _{1,

2,

3,

4,

5} , Avinash Manjula-Basavanna _{1,

2,

3,

4} , Neel S. Joshi _{1,

2,

3,

4,

5}

Affiliation

The rare earth elements (REEs) play critical roles in modern consumer electronics and clean technologies, but unpredictable supply and environmentally unsustainable extraction practices have spurred efforts to develop green methods of recovering the metals from waste streams. In this regard, we have repurposed a bacterial extracellular matrix (ECM) for selective and differential abstraction of REEs. Herein, the curli amyloid fibers in E. coli biofilms are genetically modified to display lanthanide binding tags (LBTs). The curli-LBT filters showed lanthanide specificity in the presence of other metals, with a preference for binding several high-value heavy REEs. Bound lanthanides were readily recovered using a dilute acid wash, and the filters could be re-used for multiple cycles of sorption and desorption with minimal loss of efficiency. Our engineered biofilm-derived filters provide a rapid, selective and scalable method for REE separation that is more robust compared to conventional cell-based sorbents, and this platform could be adapted to recover other precious metals or commodities.

中文翻译：

重新利用细菌细胞外基质进行稀土元素的选择性和差异提取

稀土元素（REE）在现代消费类电子产品和清洁技术中起着关键作用，但是不可预测的供应和对环境不可持续的提取方法刺激了人们努力开发从废物流中回收金属的绿色方法。在这方面，我们将细菌细胞外基质（ECM）重新用于REE的选择性和差异提取。本文中，大肠杆菌中的卷曲淀粉样蛋白纤维生物膜经过基因修饰以显示镧系元素结合标签（LBT）。curli-LBT过滤器在其他金属存在下显示镧系元素特异性，优选结合几种高价值的重稀土元素。结合的镧系元素可使用稀酸洗涤轻松回收，并且可以将过滤器重复用于多个吸附和解吸循环，而效率损失最小。我们设计的生物膜衍生过滤器提供了一种快速，选择性和可扩展的REE分离方法，与传统的基于细胞的吸附剂相比，该方法更加可靠，并且该平台可适用于回收其他贵重金属或商品。

更新日期：2018-07-30

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