Environmental Applications of Chemically Pure Natural Ferrihydrite

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• 作者：Jan Filip ; Radek Zboril ; Oldrich Schneeweiss ; Josef Zeman ; Miroslav Cernik ; Petr Kvapil ; Michal Otyepka
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：June 15, 2007
• 年：2007
• 卷：41
• 期：12
• 页码：4367 - 4374
• 全文大小：505K
• 年卷期：v.41,no.12(June 15, 2007)
• ISSN：1520-5851

文摘

Fresh precipitates, deposited from seepage waters ofcomplex-ore mine-tailing impoundment at Zlaté Hory, CzechRepublic, were characterized by means of X-ray diffraction,transmission electron microscopy, low temperature and in-field Mössbauer spectroscopy, and Brunauer-Emmett-Teller surface area measurements. The prevailing phases(~96 wt %) found in precipitates are poorly crystalline,2-6 nm sized two-line ferrihydrite, forming globularaggregates of about 150 nm in diameter, rimmed by acicularirregular nanocrystals of goethite. These nanocrystallineferrihydrite-goethite precipitates are of a relatively highchemical purity (~3% SiO₂, Zn ~ 1300 ppm, trace and rareearth elements <100 ppm) and thus applicable in variousnanotechnologies. With a surface area of 270 m² g^-1,precipitate possesses a high catalytic activity in thedecomposition of hydrogen peroxide, which is comparablewith that found for commercially accessible FeO(OH)catalyst. Another superior aspect of such natural nanoparticlespresents a cheap and suitable precursor for a thermallyinduced solid-state synthesis of the stable core-shell -Fe-FeO nanoparticles that are well applicable in reductivetechnologies of groundwater treatment. Just the possibilityof using the undesirable waste contaminating theenvironment in further environmental technologies is thekey practical benefit discussed in this paper.