title: Layer-by-layer assembly surface modified microbial biomass for enhancing biorecovery of secondary gold.
abstract: Enhancement of the biosorption capacity for gold is highly desirable for the biorecovery of secondary gold resources. In this study, polyethylenimine (PEI) was grafted on Shewanella haliotis surface through layer-by-layer assembly approach so as to improve the biosorption capacity of Au(III). Results showed that the relative contribution of amino group to the biosorption of Au(III) was the largest one (about 44%). After successful grafting 1, 2 and 3-layer PEI on the surface of biomass, the biosorption capacity significantly enhanced from 143.8mg/g to 597.1, 559.1, and 536.8mg/g, respectively. Interestingly, the biomass modified with 1-layer PEI exhibited 4.2 times higher biosorption capacity than the untreated control. When 1-layer modified biomass was subjected to optimizing the various conditions by response surface methodology, the theoretical maximum adsorption capacity could reach up to 727.3mg/g. All findings demonstrated that PEI modified S. haliotis was effective for enhancing gold biorecovery.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou 510006, PR China. Electronic address: nwzhu@scut.edu.cn.
authors.forename: Nengwu
authors.initials: N
authors.lastname: Zhu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Naixin
authors.initials: N
authors.lastname: Kang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Yanlan
authors.initials: Y
authors.lastname: Cao
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Chaohong
authors.initials: C
authors.lastname: Shi
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou 510006, PR China.
authors.forename: Pingxiao
authors.initials: P
authors.lastname: Wu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou 510006, PR China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Dang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou 510006, PR China. Electronic address: xpzhang@scut.edu.cn.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Benqian
authors.initials: B
authors.lastname: Qin
mesh_terms: D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D006046:Gold / Q000737:chemistry / Q000302:isolation & purification*; D011094:Polyethyleneimine / Q000737:chemistry; D020592:Shewanella / Q000737:chemistry* / Q000378:metabolism; D018505:Waste Management / Q000379:methods*
chemical_list: D006046:Gold; D011094:Polyethyleneimine
keywords: Gold recovery; Layer-by-layer; PEI modification; Response surface methodology; Shewanella haliotis