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Selective adsorption and recovery of precious metal ions using protein-rich biomass as efficient adsorbents

Paper ID Volume ID Publish Year Pages File Format Full-Text
34529 45032 2014 8 PDF Available
Title
Selective adsorption and recovery of precious metal ions using protein-rich biomass as efficient adsorbents
Abstract

•We propose a recycle system of precious metal ions using protein-rich biomass.•The protein-rich biomass exhibited selective adsorption for precious metal ions.•The biomass tested had high loading potentials for Au, Pd and Pt ions.•The present study proposes the mechanism of the metal-ion adsorption.•Precious metal ions were selectively recovered from actual industrial wastes.

Various types of protein-rich biomass were examined as selective and environment-friendly adsorbents for precious metal ions. In the presence of base metal ions, Au3+, Pd2+ and Pt4+ ions were selectively adsorbed to samples of protein-rich biomass. Among the biomass samples tested, egg-shell membrane exhibited the highest adsorption ability and had high selectivity for Au, Pd and Pt ions. The maximum adsorption amount of Au, Pd and Pt ions to egg-shell membrane was approximately 250, 110 and 50 mg/g, respectively, in the presence of 0.1 M HCl. Microscopic observations and metal-ion desorption studies suggested that the precious metal ions were adsorbed and a portion of them was reduced to form metal nanoparticles on the egg-shell membrane, leading to high adsorption ratios. Investigations using glycoproteins indicated the importance of sugar chains in the adsorption of Au ions to the egg-shell membrane. Successful recovery of Au, Pd and Pt ions from industrial waste solutions was also demonstrated using egg-shell membrane. Biomass sheets (1 mm thick) made from egg-shell membrane also exhibited adsorption abilities for precious metal ions.

Keywords
Biosorption; Noble metal ions; Protein; Recycle; Selective binding
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Selective adsorption and recovery of precious metal ions using protein-rich biomass as efficient adsorbents
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 5, May 2014, Pages 850–857
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us