Sorption behavior of the Pt(II) complex anion on manganese dioxide (δ-MnO2): a model reaction to elucidate the mechanism by which Pt is concentrated into a marine ferromanganese crust

详细信息    查看全文

• 作者：Mamiko Yamashita Maeno ; Hironori Ohashi ; Kotaro Yonezu…
• 关键词：Sorption of Pt ; δ ; MnO2 ; XPS ; XAFS ; Ferromanganese crust
• 刊名：Mineralium Deposita
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：51
• 期：2
• 页码：211-218
• 全文大小：587 KB
• 参考文献：Agiorgitis G, Gundlach H (1978) Platin-Gehalte in Tiefsee-Manganknollen. Naturwissenschaften 65:534CrossRef
  Ankudinov AL, Ravel B, Rehr JJ, Conradson SD (1998) Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure. Phys Rev B 58:7565–7576CrossRef
  Azaroual M, Romand B, Freyssinet P, Jean RD (2001) Solubility of platinum in aqueous solutions at 25°C and pHs 4 to 10 under oxidizing conditions. Geochim Cosmochim Acta 65:4453–4466CrossRef
  Banakar VK, Hein JR, Rajani RP, Chodankar AR (2007) Platinum group elements and gold in ferromanganese crusts from Afanasiy-Nikitin seamount, equatorial Indian Ocean: sources and fractionation. J Earth Syst Sci 116:3–13CrossRef
  Burns RG (1976) The uptake of cobalt into ferromanganese nodules. soils. and synthetic manganese (IV) oxides. Geochim Cosmochim Acta 40:95–102CrossRef
  Goldberg ED, Hodge V, Kay P, Stallard M, Koide M (1986) Some comparative marine chemistries of platinum and iridium. Appl Geochem 1:227–232CrossRef
  Halbach P (1984) Deep-sea metallic deposits. Ocean Manag 9:35–60CrossRef
  Halbach P, Kriete C, Prause B, Puteanus D (1989) Mechanisms to explain the platinum concentration in ferromanganese seamount crusts. Chem Geol 76:95–106CrossRef
  Hodge VF, Stallard M, Koide M, Goldberg ED (1985) Platinum and the platinum anomaly in the marine environment. Earth Planet Sci Lett 72:158–162CrossRef
  Jeanette MC, Byrne RH (2003) Comparative geochemistries of Pd(II) and Pt(II): formation of mixed hydroxychloro and chlorocarbonate-complexes in seawater. Geochim Cosmochim Acta 67:1331–1338CrossRef
  Li W, Brigitte E, Schwederski, Dale WM (1990) Stepwise hydrolysis kinetics of tetrachloroplatinate (II) in base. Inorg Chem 29:3578–3584CrossRef
  Murray JW, Dillard JG (1979) The oxidation of cobalt(II) sorbed on manganese dioxide. Geochim Cosmochim Acta 43:781–787CrossRef
  Ohashi H, Ezoe H, Yamashige H, Okaue Y, Matuo S, Kurisaki T, Wakita H, Yokoyama T (2005a) Reduction behavior of Au(III) complex ions sorbed on the surface of manganese dioxide: XPS study. Adv X-Ray Chem Anal Jpn 36:339–345
  Ohashi H, Ezoe H, Okaue Y, Kobayashi Y, Matsuo S, Kurisaki T, Miyazaki A, Wakita H, Yokoyama T (2005b) The effect of UV irradiation on the reduction of Au(III) ions sorbed on manganese dioxide. Anal Sci 21:789–793CrossRef
  Ravel B, Newville M (2005) ATHENA, ARTEMIS HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT. J Synchrotron Radiat 12:537–541
  Takematsu N (1998) Manganese nodule—its formation mechanism and role. Kouseishakouseikaku Co., Ltd
  Terashima S, Usui A, Nakao S, Mita N (1989) Geochemistry of platinum and gold in ocean-floor ferromanganese crusts and nodules. Bull Geol Surv Jpn 40:127–141
  Usui A (2010) Mineral resources of the seabed, Ohmsha
  
• 作者单位：Mamiko Yamashita Maeno (1)
  Hironori Ohashi (2)
  Kotaro Yonezu (3)
  Akane Miyazaki (4)
  Yoshihiro Okaue (1)
  Koichiro Watanabe (3)
  Tamao Ishida (1)
  Makoto Tokunaga (1)
  Takushi Yokoyama (1)
  
  1. Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8580, Japan
  2. Faculty of Arts and Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
  3. Department of Earth Resource Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
  4. Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, Mejirodai, Bunkyo-ku, Tokyo, 112-8681, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1866

文摘

It is difficult to directly investigate the chemical state of Pt in marine ferromanganese crusts (a mixture of hydrous iron(III) oxide and manganese dioxide (δ-MnO₂)) because it is present at extremely low concentration levels. This paper attempts to elucidate the mechanism by which Pt is concentrated into marine ferromanganese crust from the Earth’s continental crust through ocean water. In this investigation, the sorption behavior of the Pt(II) complex ions on the surface of the δ-MnO₂ that is a host of Pt was examined as a model reaction. The δ-MnO₂ sorbing Pt was characterized by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) to determine the chemical state of the Pt. Hydrolytic Pt(II) complex ions were specifically sorbed above pH 6 by the formation of a Mn-O-Pt bond. XPS spectra and XANES spectra for δ-MnO₂ sorbing Pt showed that the sorbed Pt(II) was oxidized to Pt(IV) on δ-MnO₂. The extended X-ray absorption fine structure (EXAFS) analysis showed that the coordination structure of Pt sorbed on δ-MnO₂ is almost the same as that of the [Pt(OH)₆]2− complex ion used as a standard. Therefore, the mechanism for the concentration of Pt in marine ferromanganese crust may be an oxidative substitution (penetration of Pt(IV) into structure of δ-MnO₂) by a reduction-oxidation reaction between Pt(II) in [PtCl_4-n(OH)_n]2− and Mn(IV) in δ-MnO₂ through a Mn-O-Pt bond. Keywords Sorption of Pt δ-MnO₂ XPS XAFS Ferromanganese crust