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EXAFS studies on adsorption microscopic structures of Zn at manganite-water interaface and delta-MnO2-water interaface
Alternative TitleZn在水锰矿和delta-MnO2表面吸附机构的EXAFS研究
Li, XL; Pan, G; Qin, YW; Hu, TD; Wu, ZY; Xie, YN; Chen, H; Du, YH; Hu TD(胡天斗); Wu ZY(吴自玉); Xie YN(谢亚宁)
2003
Source PublicationHIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION
Volume27Pages:#REF!
Corresponding AuthorPan, G (reprint author), Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China.
SubtypeArticle
AbstractMicroscopic structures of Zn ( H) surface complexes adsorbed at the manganite-water interface and delta-MnO2-water interface ( in a 0.1 M NaNO3 solution at 25degreesC) were studied using extended X-ray absorption fine structure ( EXAFS) spectroscopy. Quantitative analysis of the EXAFS spectra showed that Zn ( U) was adsorbed onto the solid surface by sharing the oxygen atom in the hydrous Zn2+ ions and in the structural unit MnO6 on the manganite surface at pH 7.5. Most of the adsorbed Zn ( 11) was in the form of octahedral Zn ( H2O)(6)(2+), but part of Zn( 11) was adsorbed as tetrahedral Zn( OH)(2) or Zn( OH)(4)(2-). The average Zn-O bond length was 2.00 +/- 0.01 Angstrom. EXAFS analysis of the second sphere indicated that Zn ( 11) adsorbed on the manganite resulted in two Zn-Mn atomic distances of 3.08 +/- 0.02 Angstrom and 3.54 +/- 0.02 Angstrom, corresponding to the edge-linkage ( stronger adsorption site) and corner-linkage ( weaker adsorption site) I respectively. The ZnO polyhedron was linked to the octahedron MnO6 of the manganite in these two modes by sharing two 0 atoms on the edges of the polyhedral and/or one 0 atom on the corners of the polyhedral. At pH 5.50, Zn ( U) was adsorbed onto delta-MnO2 surface in the form of octahedral hydrous Zn2+ ions. The octahedral Zn2+ was linked to the structural unit of octahedral MnO6 of the delta-MnO2 surface by sharing the 0 atoms. The average bond length of RZn-O was 2.07 +/- 0.01 Angstrom and the Zn-Mn atomic distance was 3.53 +/- 0.01 Angstrom, which corresponded to a corner-sharing linkage adsorption mode ( weaker adsorption). Macroscopic adsorption-desorption isotherm experiments showed that, in contrast to that of Zn-manganite, adsorption of Zn ( 11) on delta-MnO2, was highly reversible and no apparent adsorption hysteresis was observed. EXAFS results indicated that the adsorption reversibility was corresponded to the corner sharing linkage mode or edge sgaring linkage mode between the adsorbate and adsorbent polyhedra.
KeywordEXAFS Zn delta-MnO2 gamma-MnOOH adsorption microscopic structure
Subject AreaPhysics
Indexed BySCI
WOS SubjectPhysics, Nuclear ; Physics, Particles & Fields
WOS IDWOS:000220592300006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/225564
Collection多学科研究中心
Recommended Citation
GB/T 7714
Li, XL,Pan, G,Qin, YW,et al. EXAFS studies on adsorption microscopic structures of Zn at manganite-water interaface and delta-MnO2-water interaface[J]. HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,2003,27:#REF!.
APA Li, XL.,Pan, G.,Qin, YW.,Hu, TD.,Wu, ZY.,...&谢亚宁.(2003).EXAFS studies on adsorption microscopic structures of Zn at manganite-water interaface and delta-MnO2-water interaface.HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,27,#REF!.
MLA Li, XL,et al."EXAFS studies on adsorption microscopic structures of Zn at manganite-water interaface and delta-MnO2-water interaface".HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION 27(2003):#REF!.
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