Abstract

Ultra-thin PEI-based coatings effectively and selectively accumulated up to 13% copper in the coatings from 200 ppb in artificial seawater.

Highlights

  • Polyethyleneimine (PEI) is known to bind copper ions effectively and selectively. This is the first report on PEI-based materials for copper scavenging from ultra-low concentrations in seawater matrixes

  • The findings are relevant for water purification and sensing applications as well as extraction of copper from oceans

  • Polyethyleneimine (PEI) polymers are well known for their ability to bind metal ions,[13,14] with commercially available branched PEI commonly having primary, secondary and tertiary amine groups in approximately 1 : 1 : 0.7 ratio

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Summary

Introduction

Polyethyleneimine (PEI) is known to bind copper ions effectively and selectively. PEI has been suggested for copper sensing applications.[4,17,18] Wen et al for instance developed a spectrophotometric method based on PEI in solution for binding Cu2+ with a detection limit of 566 nM (36 ppb) and high selectivity compared to a variety of transition metal ions.[4] the method was not applicable for solutions at pH > 7. To our knowledge no investigation has reported the effect of several other metal ions competing with copper for binding to PEI at ppb concentrations.

Results
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