EXAFS studies on adsorption microscopic structures of Zn at manganite-water interaface and delta-MnO2-water interaface

	EXAFS studies on adsorption microscopic structures of Zn at manganite-water interaface and delta-MnO2-water interaface
	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)
刊名	HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION
	2003
卷号	27 页码:#REF!
关键词	EXAFS Zn delta-MnO2 gamma-MnOOH adsorption microscopic structure
其他题名	Zn在水锰矿和delta-MnO2表面吸附机构的EXAFS研究
通讯作者	Pan, G (reprint author), Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China.
英文摘要	Microscopic 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.
学科主题	Physics
类目[WOS]	Physics, Nuclear ; Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000220592300006
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225564]
专题	高能物理研究所_多学科研究中心
推荐引用方式 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!.