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Molecular Mechanisms of Lead Binding to Ferrihydrite-Bacteria Composites: ITC, XAFS, and mu-XRF Investigations

文献类型：期刊论文

作者Chen, Hansong1,3,4; Tan, Wenfeng1,5; Lv, Wei5; Xiong, Juan5; Wang, Xiaoming5; Yin, Hui5; Fang, Linchuan1,2
刊名ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期2020-04-07
卷号54期号:7页码:4016-4025
ISSN号0013-936X
DOI10.1021/acs.est.9b06288
通讯作者Fang, Linchuan(flinc629@hotmail.com)
英文摘要Binding of Pb(II) to ferrihydrite-Bacillus subtilis composites formed in the presence of bacterial cells were investigated through macroscopic and microscopic techniques. Diffuse layer model (DLM) fitting and isothermal titration calorimetry (ITC) analysis indicated that the hydroxyl group played a key role in Pb(II) sorption onto composites by masking reactive sites, such as carboxyl and phosphoryl groups of bacterial cells. Negative enthalpy (from -39.29 to -57.87 kJ mol(-1)) and positive entropy (from 135.61 to 193.47 kJ mol(-1)) of Pb(II) sorption onto composites revealed that inner-sphere complexes formed through exothermic reactions and was driven by both entropy and enthalpy. Spatial distribution of these inner-sphere species at varied Pb(II) loading demonstrated that interactions between Pb(II) and bacterial cells preceded that of mineral components in composites, using microfocus X-ray fluorescence spectroscopy (mu-XRF) maps and microfocus X-ray absorption near edge structure (mu-XANES) spectra. Combined with bulk Pb L-m-edge X-ray absorption fine structure (XAFS) spectrum, we inferred that mononuclear bidentate edge-sharing hydroxyl-Pb complexes, monodentate mononuclear carboxyl-Pb and phosphoryl-Pb complexes predominantly contributed to Pb(II) inner-sphere binding with mineral and bacterial fractions in composites, respectively. The molecular binding mechanisms obtained in this study provide further insight into the sequestration and migration of toxic metals in natural environments.
WOS关键词CADMIUM ADSORPTION ; BACILLUS-SUBTILIS ; SORPTION ; CU(II) ; SPECIATION ; PB(II) ; SPECTROSCOPY ; COPPER ; CU
资助项目National Natural Science Foundation of China[41425006] ; National Natural Science Foundation of China[41977031] ; CAS Light of West China Program[XAB2016A03] ; State Key Laboratory of Loess and Quaternary Geology CAS[SKLLQGZR1803] ; Education Department Foundation of Zhejiang Province[Y201738652]
WOS研究方向Engineering ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000526418000033
出版者AMER CHEMICAL SOC
资助机构National Natural Science Foundation of China ; CAS Light of West China Program ; State Key Laboratory of Loess and Quaternary Geology CAS ; Education Department Foundation of Zhejiang Province
源URL[http://ir.igsnrr.ac.cn/handle/311030/159842]  
专题中国科学院地理科学与资源研究所
通讯作者Fang, Linchuan
作者单位1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Zhejiang Normal Univ, Coll Xingzhi, Jinhua 321000, Zhejiang, Peoples R China
5.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Hansong,Tan, Wenfeng,Lv, Wei,et al. Molecular Mechanisms of Lead Binding to Ferrihydrite-Bacteria Composites: ITC, XAFS, and mu-XRF Investigations[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(7):4016-4025.
APA Chen, Hansong.,Tan, Wenfeng.,Lv, Wei.,Xiong, Juan.,Wang, Xiaoming.,...&Fang, Linchuan.(2020).Molecular Mechanisms of Lead Binding to Ferrihydrite-Bacteria Composites: ITC, XAFS, and mu-XRF Investigations.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(7),4016-4025.
MLA Chen, Hansong,et al."Molecular Mechanisms of Lead Binding to Ferrihydrite-Bacteria Composites: ITC, XAFS, and mu-XRF Investigations".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.7(2020):4016-4025.

入库方式： OAI收割

来源：地理科学与资源研究所

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