中文摘要：

应用延展X射线吸收精细结构（EXAFS）方法，初步研究了不同pH硝酸铜溶液中Cu^2＋的微观局域结构以及Cu^2＋吸附对针铁矿中Fe^3＋微观局域结构的影响，为阐明其环境行为提供理论依据。结果表明，不同pH（pH2和8）条件下，硝酸铜溶液中Cu^2＋离子的微观局域结构相同，Cu—O的配位数、键长和热无序度分别为4．3～4．4、1．95—1．96A和0．0056A^2，这种结构与Cu^2＋离子的Jahn—Teller效应有关；pH2条件下未发现Cu—Cu配位峰的存在，而pH8时则在2．40A附近出现了Cu—Cu的配位峰，说明这时已形成了相应的Cu的沉淀物。吸附Cu^2＋离子之前，针铁矿第一配位层Fe—O的配位数、键长和热无序度分别为6．2、1．98A和0．0083A^2；吸附Cu^2＋离子之后．针铁矿中Fe—O的配位数和键长未发生改变，但其热无序度增加。

英文摘要：

It is important to understand the microscopic structure of Cu or Fe for clarifying their environmental behavior. The effects of pH on microscopic local structure of Cu （ Ⅱ ） in Cu（NO3）ESOlution and Cu （ Ⅱ ） adsorption on that of goethite （α-FeOOH） were preliminarily studied by extended x-ray absorption fine structure （EXAFS） technique. The results showed that the microscopic local structure of Cu （ Ⅱ ） in Cu（NO3）2 solution under different pH conditions was identical, and the coordination number （N）, bond length （R） and thermal disorder parameter （σ12） were 4.3-4.4, 1.95-1.96 A and 0.005 6 A^2 for the Cu-O first neighbor shell, respectively. The Jahn-Teller effect which makes the axial CuO bonds difficult to characterize quantitatively by EXAFS spectroscopy was related to the EAXFS results of Cu （ Ⅱ ）. The coordination peak of Cu-Cu was not detected at pH 2, but it occurred at about 2.40 A at pH 8, indicating that the formation of Cu（OH）2 precipitate at pH 8. Before the adsorption of Cu （ Ⅱ ） onto goethite, the N, R and σ^2 were 6.2, 1.98 A and 0.008 3 A^2 for the Fe-O first neighbor shell in goethite respectively. The N and R of Fe-O were identical to initial goethite after the adsorption of Cu （Ⅱ ） onto goethite, but its σ^2 increased.