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Abstract:
In this study, lignocellulose was modified with N-terminated siloxanes and then used as adsorbent for the removal of used motor oil from water.After modification, Fourier-transform infrared spectroscopy (FTIR) showed that N-terminated siloxanes were grafted onto lignocellulose. The adsorbents prepared showed very good adsorption properties for the removal of used motor oil in aqueous medium: up to 90 mg of COD were removed per g of lignocellulose modified with N-terminated siloxanes. Some Langmuir isotherms were not very high, but a reasonable fit for adsorption of used motor oil onto lignocellulose modified with siloxanes was obtained, suggesting that the oil uptake occurred onto a monolayer adsorbent surface. Whereas Freundlichisotherms could not be applied because linear plots appeared not to fit. The correlation coefficient (R2? 0.9997) from pseudo-second order equations suggested that adsorption couldhave involved chemisorption.
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