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XAFS studies on surface coordination of Pb2+ on birnessites with different average oxidation states
Zhao, W; Tan, WF; Feng, XH; Liu, F; Xie, YN; Xie, Z; Xie YN(谢亚宁)
2011
Source PublicationCOLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume379Issue:1-3 SIPages:#REF!
Corresponding AuthorFeng, XH (reprint author), Huazhong Agr Univ, Minist Agr China, Key Lab Subtrop Agr Resource & Environm, Wuhan 430070, Peoples R China.
SubtypeArticle; Proceedings Paper
AbstractThe adsorption of Pb2+ on birnessites was investigated by X-ray absorption fine structure (XAFS). Two Pb-O and two Pb-Mn shells were detected in the birnessites with Pb loading. For the same birnessite at low Pb loading (600 mmol/kg) the two Pb-O shells consisted of 3.1 0 atoms at 0.227 nm and 8.2 0 atoms at 0.399 nm, respectively. The two Pb-Mn shells consisted of 2.8 Mn atoms at 0.357 nm, and 6.1 Mn atoms at 0.377 nm. At high lead loading (2344 mmol/kg) 0 atoms number decreased to respectively 1.2 at 0.226 nm, and 3.0 at 0.397 nm in the two Pb-0 shells, and Mn atoms number decreased to respectively 1.0 at 0.356 nm and 2.8 at 0.375 nm in the two Pb-Mn shells. This is indicative of the distortion of the Pb2+ coordination environment with increased loading of Pb. The amount of Pb2+ adsorbed increased with increasing values of the average oxidation state (AOS) of birnessite, also in this case the distortion of the Pb2+ coordination environment led to a decrease in the Pb-0 coordination numbers in both the Pb-O shells and in the Pb-Mn coordination numbers in both the Pb-Mn shells. Based on the XAFS analyses, three bonding mechanisms of Pb2+ adsorbed on the birnessites with different Mn AOS were proposed: a single-corner-sharing complex on particle edges along the u axis of MnO6 layers, a double-corner-sharing complex on particle edges along the a or b axis, and a triple-corner-sharing complex in the interlayer above or below vacant sites. (C) 2010 Published by Elsevier B.V.
KeywordBirnessite X-ray absorption fine structure Coordination of adsorbed Pb2+ Single-corner-sharing complex Double-corner-sharing complex Triple-corner-sharing complex
Subject AreaChemistry
DOI10.1016/j.colsurfa.2010.11.040
Indexed BySCI
WOS SubjectChemistry, Physical
WOS IDWOS:000289920200014
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/226040
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Zhao, W,Tan, WF,Feng, XH,et al. XAFS studies on surface coordination of Pb2+ on birnessites with different average oxidation states[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2011,379(1-3 SI):#REF!.
APA Zhao, W.,Tan, WF.,Feng, XH.,Liu, F.,Xie, YN.,...&谢亚宁.(2011).XAFS studies on surface coordination of Pb2+ on birnessites with different average oxidation states.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,379(1-3 SI),#REF!.
MLA Zhao, W,et al."XAFS studies on surface coordination of Pb2+ on birnessites with different average oxidation states".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 379.1-3 SI(2011):#REF!.
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