Intensification of sorption-reduction coupled gold biorecovery process through microbial surface modification: effect on gold sorption and reduction
文献类型： 外文期刊
作者： Shi, Chaohong 1 ; Gu, Wenjie 1 ; Zhu, Nengwu 2 ;
作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Plant Nutr & Fertilizer South Reg, Minist Agr,Guangdong Key Lab Nutrient Cycling & F, Guangzhou 510640, Peoples R China
2.South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Peoples R China
3.Guangdong Environm Protect Key Lab Solid Waste Tr, Guangzhou 510006, Peoples R China
关键词： Biorecovery; Gold; Microbial surface modification; Process intensification
期刊名称：WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY （ 影响因子：3.312； 五年影响因子：3.58 ）
ISSN： 0959-3993
年卷期： 2020 年 36 卷 3 期
页码：
收录情况： SCI
摘要： 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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