Cu(II) sorption by biogenic birnessite produced by Pseudomonas putida strain MnB1: structural differences from abiotic birnessite and its environmental implications

doi:10.1039/c7ce02168b

	Cu(II) sorption by biogenic birnessite produced by Pseudomonas putida strain MnB1: structural differences from abiotic birnessite and its environmental implications
	Liu, YW; Chu SQ(储胜启); Lu, AH; Wang, CQ; Chu, SQ; Yin, H; Liu, FF; Zhang, HQ; Ding, HR; Chen, N
刊名	CRYSTENGCOMM
	2018
卷号	20 期号:10 页码:1361-1374
ISSN号	1466-8033
DOI	10.1039/c7ce02168b
文献子类	Article
英文摘要	Biogenic birnessite is the most prevalent form of Mn-oxide in nature and it plays important roles in controlling the mobility of heavy metals such as Cu(II). This study focuses on the fine mineralogical characteristics of Cu(II)-incorporated biogenic (bio-) birnessite produced by the Pseudomonas putida strain MnB1, and discusses the structural stability of Cu-binding birnessite. Compared to the structural analog, hexagonal (abio-) birnessite, the X-ray diffraction (XRD) patterns of bio-birnessite showed an enlarged interlayer space from 7.33 to similar to 9.17 angstrom. The reduced in-plane crystallinity and increased lattice parameter b were indicated after Cu(II) adsorption. The linear combination fitting of the Mn K-edge X-ray absorption near-edge structure (XANES) indicated similar to 13% Mn(II), and only a small amount of Mn(III) was present. The saturated sorption amount of Cu(II) was 0.17 and 0.25 mol Cu/mol Mn for bio- and abio-birnessite, respectively. By conducting extended X-ray absorption fine structure (EXAFS) spectroscopic analysis, multiple coordination paths of Cu-Mn similar to 2.85 angstrom, Cu-Cu similar to 3.00 angstrom and Cu-Mn similar to 3.43 angstrom were shown to exist in both bio-and abio-birnessite, showing the diversity of the Cu coordination structure. The fitted coordination numbers for these three paths were much larger (with identical Debye-Waller factors) in bio-birnessite (1.9, 1.9 and 2.5, respectively) compared to abio-birnessite (1.1, 1.1, 1.6), indicating that Cu had more surrounding atoms in bio-birnessite. The results indicate that Cu sorption by vacant sites, i.e. incorporation into the vacancy (INC species) or adsorption on the vacancy (TCS species), was more dominant for bio-birnessite, which may have benefitted from the larger interlayer space for accommodation of the Cu inner-sphere complex and the very low content of structural Mn(III) competing for vacant sites. In turn, the Cu inner-sphere complex modified both the layer and interlayer structures of bio-birnessite. In abio-birnessite, Cu binds favorably at abundant edge sites as dimers or multinuclear clusters, which contributes to a larger sorption amount. This binding style was depressed in bio-birnessite because the organic ligands released by microbial activity could block the layer edges. Theoretically, the structural stability of Cu clusters at the edges should be weaker than the TCS and INC species. This work also provides insight into the geochemical behaviors of Cu(II) controlled by widespread biogenic birnessite.
WOS关键词	X-RAY-DIFFRACTION ; ZN ISOTOPIC FRACTIONATION ; HIGH-TEMPERATURE DECOMPOSITION ; ABSORPTION FINE-STRUCTURE ; MANGANESE HYDROUS OXIDES ; METAL SORBED BIRNESSITE ; NA-RICH BIRNESSITE ; HEXAGONAL BIRNESSITE ; XANES SPECTROSCOPY ; MOLECULAR CONTROLS
WOS研究方向	Chemistry ; Crystallography
语种	英语
WOS记录号	WOS:000430582900004
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285833]
专题	高能物理研究所_多学科研究中心高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Liu, YW,Chu SQ,Lu, AH,et al. Cu(II) sorption by biogenic birnessite produced by Pseudomonas putida strain MnB1: structural differences from abiotic birnessite and its environmental implications[J]. CRYSTENGCOMM,2018,20(10):1361-1374.
APA	Liu, YW.,储胜启.,Lu, AH.,Wang, CQ.,Chu, SQ.,...&Li, Y.(2018).Cu(II) sorption by biogenic birnessite produced by Pseudomonas putida strain MnB1: structural differences from abiotic birnessite and its environmental implications.CRYSTENGCOMM,20(10),1361-1374.
MLA	Liu, YW,et al."Cu(II) sorption by biogenic birnessite produced by Pseudomonas putida strain MnB1: structural differences from abiotic birnessite and its environmental implications".CRYSTENGCOMM 20.10(2018):1361-1374.