XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite
XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite
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DOI：
10.1051/jp4:1997249
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发表时间：
1997-04-01
期刊：
影响因子：
--
通讯作者：
Brown, GE
中科院分区：
文献类型：
--
作者：
Bargar, JR;Persson, P;Brown, GE
用EXAFS光谱研究了Cl-存在下Pb（II）和Hg（II）在针铁矿（α-FeOOH）表面的吸附络合物。在pH 7，占主导地位的Pb（II）的物种被绑定到FeO 6八面体的边缘，并在没有Cl-的情况下发生类似的配合物。在pH值小于或等于6，铅（II）-氯三元配合物占主导地位，并结合到角落的FeO 6八面体。在pH 6.5时，线性HO（OH）Cl三元复合物占主导地位，通过表面氧在弯曲的Hg-O-Fe几何形状结合到针铁矿。在没有Cl-的情况下，Hg（II）表面络合物保留这种基本的几何形状，但OH基团取代了第一配位壳层中的氯离子。
EXAFS spectroscopy was used to study Pb(II) and Hg(II) adsorption complexes on goethite (alpha-FeOOH) in the presence of Cl-. At pH 7, the dominant Pb(II) species are bonded to edges of FeO6 octahedra and are similar to complexes that occur in the absence of Cl-. At pH less than or equal to 6, Pb(II)-chloro ternary complexes predominate and are bonded to corners of FeO6 octahedra. At pH 6.5, linear HO(OH)Cl ternary complexes predominate that are bonded to goethite through surface oxygens in a bent Hg-O-Fe geometry. In the absence of Cl-, the Hg(II) surface complexes retain this basic geometry, but an OH group replaces the chloride ion in the first coordination shell.