Abstract
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 with many pores and the increase of amino group content on microbial biomass surface were the main impetus for the gold bioreocovery process intensification.
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Acknowledgements
The research was financially supported by the National Natural Science Foundation of China (51178191), Program for New Century Excellent Talents in University (NCET-11-0166), Fundamental Research Funds for the Central Universities (2017PY012), Guangdong Provincial Science and Technology Project (2017A020216013, 2017B020203002), Guangzhou Science and Technology Project (201604020055, 201710010182) and Pearl River S&T Nova Program of Guangzhou (201710010182).
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Shi, C., Gu, W. & Zhu, N. Intensification of sorption–reduction coupled gold biorecovery process through microbial surface modification: effect on gold sorption and reduction. World J Microbiol Biotechnol 36, 38 (2020). https://doi.org/10.1007/s11274-020-2796-5
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DOI: https://doi.org/10.1007/s11274-020-2796-5