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Acta Physico-Chimica Sinica  2005, Vol. 21 Issue (10): 1169-1173    DOI: 10.3866/PKU.WHXB20051022
Note     
EXAFS Study of Zn (II) Adsorption and Precipitation on γ-MnOOH Surface under Different pH Conditions
ZHU Meng-qiang; PAN Gang; LI Xian-liang; LIU Tao; YANG Yu-huan
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco- Environmental Sciences, Chinese Academy of Sciences, Beijing 100085; Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039
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Abstract  Mechanisms of adsorption and precipitation of Zn(II) onγ-MnOOH-water interfaces at pH 7.00, 7.50 and 8.00 were studied using EXAFS (extended X-ray absorption fine structure). The Zn—O distance for adsorbed Zn(II) was 0.202 nm, which did not change when pH increased from 7.00 to 8.00. This result implied that Zn2+ was adsorbed as a mixture of tetrahedron and octahedron. At pH 7.00, Zn2+ was adsorbed on (110) or (001) plane of γ-MnOOH by edge linkage mode, which corresponded a Zn—Mn distance of ~0.300 nm. At pH 7.50 and 8.00, most Zn(II) was precipitated as multinuclear hydroxo-complexes with similar structures where the Zn—Zn distances were 0.353 nm (tetrahedron-octahedron linkage) and 0.311 nm (octahedron-octahedron linkage), respectively.

Key wordsZn(II)      Adsorption      Precipitation      γ-MnOOH      EXAFS     
Received: 03 March 2005      Published: 15 October 2005
Corresponding Authors: PAN Gang     E-mail: gpan@mail.rcees.ac.cn
Cite this article:

ZHU Meng-qiang; PAN Gang; LI Xian-liang; LIU Tao; YANG Yu-huan. EXAFS Study of Zn (II) Adsorption and Precipitation on γ-MnOOH Surface under Different pH Conditions. Acta Physico-Chimica Sinica, 2005, 21(10): 1169-1173.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20051022     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2005/V21/I10/1169

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