Biobased adsorbent prepared by pyrolysis of a renewable agriculture waste

  • 1 Institute of General and Inorganic Chemistry-Bulg.Acad.Sci.
  • 2 University of Chemical Technology and Metallurgy, Sofia, Bulgaria


The study deals with preparation of carbon/SiO2 based natural composite material by slow pyrolysis of rice husks at 480° C. The phase composition, microstructure and morphology of the solid pyrolysis residue were investigated by XRD, FTIR spectrometry, thermal analysis, Hg-porosimetry, B.E.T. specific surface area and SEM-EDS. The sorption capacity of the pyrolyzed rice husks (PRH) upon adsorption of oil and oil products spills was determined. The obtained results revealed that PRH possess high sorption ability toward to gasoline, diesel, motor oil, light and heavy crude oil, in the range of 3.7 to 9.2 The adsorbent is characterized with hydrophobicity and buy-effect 90% more 10 days. PRH were investigated also as material for deep adsorption removal of thiophene from model fuel under batch mode. It was found that adsorption of 92% of the aromatic sulfur compound from the model fuel was achieved.



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