Proteins and protein-rich biomass as environmentally friendly adsorbents selective for precious metal ions

Tatsuo Maruyama, Hironari Matsushita, Yukiko Shimada, Ichiro Kamata, Misa Hanaki, Saori Sonokawa, Noriho Kamiya, Masahiro Goto

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

Proteins exhibit specific interactions with various metal ions, which play important roles in a living cell. Here, we found that various proteins selectively adsorbed precious metal ions at a wide range of pH values. Studies on protein sequences and on synthesized peptides revealed that a histidine-containing sequence had specific interactions with precious metal ions (Au3+ and Pd2+). We then investigated a few types of protein-rich biomass as adsorbents for precious metal ions. In the presence of various transition metal ions, Au3+ and Pd2+ were also selectively adsorbed onto the biomass tested. The bound precious metal ions were recovered by aqua regia after charring the metal-bound biomass. Finally, we demonstrated the successful recovery of Au3+ and Pd2+ from a metal refining solution and a metal plating waste using the biomass. We propose an environmentally friendly recycling system for precious metal ions using protein-rich biomass.

Original languageEnglish
Pages (from-to)1359-1364
Number of pages6
JournalEnvironmental Science and Technology
Volume41
Issue number4
DOIs
Publication statusPublished - Feb 15 2007

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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