ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Solid particles of ferric oxyhydroxides or iron oxide were recrystallized from ferrous andferric ions dissolved in aqueous solution. There are different structures of α-FeOOH, β-FeOOH andγ-FeOOH in the ferric oxyhydroxides, of which the formation is influenced by reaction conditionssuch as oxidation rate of ferrous ions. In this work, a few factors affecting the formation of the ferricoxyhydroxides and iron oxides, which was converted from hydrosulfate green rust, has been studiedusing different methods. The hydrosulfate green rust (GR2) was synthesized from solutions of ferricsulfate (Fe2(SO4)3), ferrous sulfate (FeSO4), and sodium hydroxide (NaOH), and they were oxidizedby gas containing oxygen. X-ray diffraction measurements and X-ray absorption spectroscopy wereused for analyzing the structure and chemical state of solid particles extracted from the suspensionduring the oxidation. The morphology of the particles was observed by transmission electronmicroscopy. The results showed that γ-FeOOH or Fe3O4 particles were formed together withα-FeOOH particles during conversion from the green rust, depending on oxidation temperature,oxygen flow rate and addition of manganese. This indicates that the species of ferric oxyhydroxidesor iron oxides formed in aqueous solution is sensitively influenced by reaction conditions
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.1389.pdf
Permalink
