Magnetic Amphiphilic Composites Applied for the Treatment of Biodiesel Wastewaters

In this work, new magnetic amphiphilic composites were prepared by chemical vapor deposition with ethanol on the surface of hydrophilic natural chrysotile matrix containing Fe catalyst. XRD, Raman, Mossbauer and SEM analyses suggest the formation of a complex nanostructured material composed of hydrophobic carbon nanotubes/nanofibers grown on the hydrophilic surface of the MgSi fiber mineral and the presence of Fe metallic nanoparticles coated by carbon. These nanostructured particles show amphiphilic properties and interact very well with both oil and aqueous phases. When added to emulsions the amphiphilic particles locate on the oil/water interface and, under a magnetic field, the oil droplets collapsed leading to the separation of the aqueous and oil phases. Preliminary work showed excellent results on the use of these particles to break wastewater emulsions in the biodiesel process.

[1]  R. Frost,et al.  Purity evaluation of carbon nanotube materials by thermogravimetric, TEM, and SEM methods. , 2007, Journal of nanoscience and nanotechnology.

[2]  Xing-Jie Liang,et al.  Theranostic nanoparticles engineered for clinic and pharmaceutics. , 2011, Accounts of chemical research.

[3]  J. Argillier,et al.  Heavy Oil−Water Interfacial Properties and Emulsion Stability: Influence of Dilution , 2009 .

[4]  A. Cattaneo,et al.  Kinetic study of the dehydroxylation of chrysotile asbestos with temperature by in situ XRPD , 2003 .

[5]  Markus Eisenbach,et al.  First principles calculation of finite temperature magnetism in Fe and Fe3C , 2011 .

[6]  Eileen Mason,et al.  Asbestos: Mineral and fibers , 2002 .

[7]  Riichiro Saito,et al.  Characterizing carbon nanotube samples with resonance Raman scattering , 2003 .

[8]  R. Lago,et al.  Magnetic amphiphilic composites based on carbon nanotubes and nanofibers grown on an inorganic matrix: effect on water-oil interfaces , 2010 .

[9]  Qi Zhou,et al.  Analysis of biological demulsification process of water-in-oil emulsion by Alcaligenes sp. S-XJ-1. , 2010, Bioresource technology.

[10]  Anubhav Tripathi,et al.  Imaging new transient nanostructures using a microfluidic chip integrated with a controlled environment vitrification system for cryogenic transmission electron microscopy. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[11]  R. Lago,et al.  Production of nanostructured magnetic composites based on Fe0 nuclei coated with carbon nanofibers and nanotubes from red mud waste and ethanol. , 2011 .

[12]  F. Larachi,et al.  Mössbauer Spectroscopy and Catalytic Reaction Studies of Chrysotile-Catalyzed Steam Reforming of Benzene , 2011 .

[13]  A. Morgan.  Acid leaching studies of chrysotile asbestos from mines in the Coalinga region of California and from Quebec and British Columbia. , 1997, The Annals of occupational hygiene.

[14]  A. Teixeira,et al.  Hybrid magnetic amphiphilic composites based on carbon nanotube/nanofibers and layered silicates fragments as efficient adsorbent for ethynilestradiol. , 2012, Journal of colloid and interface science.

[15]  C. Tondre,et al.  Copper(II) complexation by hydrophobic single- and double-alkyl chain ligands solubilized in ammonium surfactant vesicles , 1997 .

[16]  C. Basheer,et al.  Development and application of polymer-coated hollow fiber membrane microextraction to the determination of organochlorine pesticides in water. , 2004, Journal of chromatography. A.

[17]  Sandeep Kumar,et al.  Appl. Sci , 2013 .

[18]  Bruno R. S. Lemos,et al.  Amphiphilic magnetic composites based on layered vermiculite and fibrous chrysotile with carbon nanostructures: Application in catalysis , 2012 .

[19]  R. Lago,et al.  Carbon nanostructures-modified expanded vermiculites produced by chemical vapor deposition from ethanol , 2011 .

[20]  Riichiro Saito,et al.  Raman spectroscopy of carbon nanotubes , 2005 .

[21]  S. Musić,et al.  Spectroscopic characterization of chrysotile asbestos from different regions , 2011 .

[22]  W. Kegel,et al.  Evolution of equilibrium Pickering emulsions--a matter of time scales. , 2010, The journal of physical chemistry. B.