Issue 15, 2018

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

Abstract

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.

Graphical abstract: Repurposing bacterial extracellular matrix for selective and differential abstraction of rare earth elements

Supplementary files

Article information

Article type
Paper
Submitted
30 Сәу. 2018
Accepted
26 Мау. 2018
First published
26 Мау. 2018

Green Chem., 2018,20, 3512-3520

Author version available

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

P. K. R. Tay, A. Manjula-Basavanna and N. S. Joshi, Green Chem., 2018, 20, 3512 DOI: 10.1039/C8GC01355A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements