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Intensification of Sorption–reduction Coupled Gold Biorecovery Process Through Microbial Surface Modification: Effect on Gold Sorption and Reduction by Shi, Chaohong; Gu, Wenjie; Zhu, Nengwu is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Biorecovery is emerging as a promising approach to retrieve gold from various sources, while its efficiency is usually restricted by the limited functional groups on natural microbial biomass surface. This study aims to intensify Pycnoporus sanguineus boosted sorption-reduction coupled gold biorecovery process via microbial surface modification. Results showed that grafting polyallylamine hydrochloride onto P. sanguineus biomass surface increased amino group content on microbial biomass surface from 1.29 to 2.81 mmol/g. When applying modified biomass to gold biorecovery with initial gold concentrations of 1.0, 2.0 and 3.0 mM, biosorption equilibrium time shortened to the 12.5%, 37.5% and 41.7% of those obtained with pristine biomass, and sorption rate constants correspondingly increased to 11.2, 3.1 and 3.7 folds as well. Maximum sorption capacity increased 30% and the affinity between biomass and gold enhanced heavily after microbial surface modification. Meanwhile, microbial surface modification favored gold reduction and gold nanoparticles (AuNPs) formation. The change of microbial biomass morphology from smooth surface with some branched structure to layered stacking structure

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Author

Shi, Chaohong; Gu, Wenjie; Zhu, Nengwu

Publisher

Springer; Springer-Verlag; Springer Science + Business Media; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 1573-0972)

Published

2020

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)