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Removal of heavy metals by immobilized nano-scale iron oxides
Kurzbeschreibung (Deutsch)
Heavy metals are essential for plants and organisms growth yet, above thresholdrnconcentrations they become toxic. Methods used for removal of heavy metals includernprecipitation, adsorption, membrane filtration and ion exchange. These process applicationsrnare limited in many practical situations due to various interferences, development andrncontrol costs, maintenance problems and process limitations. Most countries place limits onrnthe concentration of varying metals that may be discharged either directly to thernenvironment or to wastewater treatment plants, with restrictive regulatory direction takenrnplace in the last years.rnMicro-scale iron oxides are known to adsorb inorganic contaminants including heavy metals.rnBy reducing the particles size of iron oxide (i. e. increasing the surface-to-volume ratio)rnenhanced adsorption is expected. Nevertheless, nano-sized particles are suspended inrnaqueous solutions and, consequently, cannot easily be separated from the mother liquor.rnTherefore, immobilization of the nano-adsorbents onto supporting materials enables efficientrnuse of the nano-particles extended surface area. By combining activated carbon as arnsupporting skeleton and nano-scale iron oxide particles as an active phase, it will be possiblernto take advantage of both.
Kurzbeschreibung (Englisch)
Heavy metals are essential for plants and organisms growth yet, above thresholdrnconcentrations they become toxic. Methods used for removal of heavy metals includernprecipitation, adsorption, membrane filtration and ion exchange. These process applicationsrnare limited in many practical situations due to various interferences, development andrncontrol costs, maintenance problems and process limitations. Most countries place limits onrnthe concentration of varying metals that may be discharged either directly to thernenvironment or to wastewater treatment plants, with restrictive regulatory direction takenrnplace in the last years.rnMicro-scale iron oxides are known to adsorb inorganic contaminants including heavy metals.rnBy reducing the particles size of iron oxide (i. e. increasing the surface-to-volume ratio)rnenhanced adsorption is expected. Nevertheless, nano-sized particles are suspended inrnaqueous solutions and, consequently, cannot easily be separated from the mother liquor.rnTherefore, immobilization of the nano-adsorbents onto supporting materials enables efficientrnuse of the nano-particles extended surface area. By combining activated carbon as arnsupporting skeleton and nano-scale iron oxide particles as an active phase, it will be possiblernto take advantage of both.
Zeitraum
01.04.2011 - 20.09.2011
Art der Finanzierung
Drittmittel
Projektleiter
- Herr Prof. Dr.-Ing. Wolfgang Uhl
- Frau Dr.-Ing. Irene Slavik
Projektmitarbeiter
- Herr Dipl. Ing. Andreas Kimmig
Kooperationspartnerschaft
international
Externe Kooperationspartner
- Raphale Semiat, Technion – Institute of Technology (Israel)
Website zum Projekt
Relevant für den Umweltschutz
Ja
Relevant für Multimedia
Nein
Relevant für den Technologietransfer
Ja
Schlagwörter
eisenimprägnierte Aktivkohle, Schwermetalle, nFe-GAC
Berichtsjahr
2011