Use of Biodiesel Press Cake Waste to Prepare Fe/Carbon Reactive Composites for Environmental Applications: Removal of Hazardous Cr-VI Contaminants

作者：Santos Elizangela A; Ortega Paulo F R; Lavall Rodrigo L; Reis Sergio C; Ardisson Jose D; Lago Rochel M; Nascentes Clesia C; Costa Leticia M^*

来源：Journal of the Brazilian Chemical Society, 2015, 26(10): 2130-2136.

DOI：10.5935/0103-5053.20150199

• biodiesel press cake
• reactive Fe phases
• carbon support
• hexavalent chromium

In this work, Ricinus communis L. press cake waste from biodiesel production was used to produce a versatile reactive material for environmental applications. The biodiesel cake waste was impregnated with Fe-III at different concentrations (19-45 wt.%) and treated at 400, 600 and 800 degrees C. Mossbauer, X-ray diffraction (XRD), thermogravimetric analysis (TG/DTA), scanning electron microscope (SEM), elemental analysis CHN, Raman, potentiometric titration, saturation magnetization and Brunauer-Emmett-Teller (BET) analyses showed that the materials prepared at 400 degrees C are composed mainly of a graphitic and amorphous carbon containing dispersed magnetite (Fe3O4). At higher temperatures, metallic iron (Fe-0) and iron carbide (Fe3C) are the predominant phases well dispersed in the carbon porous structure. These reduced iron species, Fe3O4 and Fe-0, are active for the reduction of different hazardous contaminants. Preliminary experiments showed very high activities for the reduction and removal of aqueous CrVI.

• 出版日期2015-10