IRON OXIDES NANOPARTICLES FOR HEAVY METALS REMOVING FROM INDUSTRIAL WATERS
Sergiu Sora, Van-Staden Raluca, Van-Staden Jacobus-Frederick, Ion Rodica Mariana
Pagini: 84-89
Publicat: 1 Jan 2011
Vizualizări: 238
Descărcări: 23
Rezumat: In the environment, the iron oxides may be useful for depollution process by means of a wide range of redox reactions. Hexavalent chromium (CrVI) is a toxic form of chromium, whereas the trivalent form is not. Reduction of CrVI to CrIII is, thus, a detoxifying process and takes place in soils and sediments under anoxic conditions. Hexavalent Cr reacts with magnetite to form CrIII. The reaction yields to a surfficial transformation of magnetite into maghemite. Substitution of a large range of cations can be easily induced in magnetite and maghemite because tetrahedral as well as octahedral positions are available. Dissolution curves indicated that Co, Ni and Zn were randomly distributed within the structure and replaced octahedral Fe. In contrast, Cu, Mn and Cd appear to be concentrated near the surface of the crystals. Trace amounts of chromate ions adsorbed on magnetite are reduced to Cr (III) at the surface of Fe ions. A solid state reaction in which the surface layers of magnetite are converted into maghemite appears to be involved: as more chromate is adsorbed, further reduction is halted.
Cuvinte cheie: magnetite nanoparticles
Citează acest articol: Sergiu Sora, Van-Staden Raluca, Van-Staden Jacobus-Frederick, Ion Rodica Mariana. IRON OXIDES NANOPARTICLES FOR HEAVY METALS REMOVING FROM INDUSTRIAL WATERS. Journal of International Scientific Publications: Materials, Methods & Technologies 5, 84-89 (2011). https://www.scientific-publications.net/en/article/1003322/
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