Kinectic study and heavy metals removals from used engine oil treated with groundnut shells

Description

Abstract Removal of heavy metals from used engine oil treated with modified groundnut shell as adsorbent using batch adsorption process was investigated. The adsorbent was chemically modified using 1M zinc chloride (1M ZnCl) and Fourier Transformed Infrared Spectroscopy was carried out to identify the surface functional groups of the adsorbent. Heavy metals such as Cadmium (Cd), Copper (Cu), Iron (Fe), Lead (Pb), Chromium (Cr) and Cobalt (Co) were of interest and the sorption capacity at  the optimum adsorbent dosage of 0.2 g and 50 minutes contact time was: Fe  Cd  Cr  Cu  Co  Pb   Co   in order of 99.707, 99.106, 98.078,85.547, 84.428 and 58.529%  respectively. Both Langmuir and Freundlich isotherm equations described the adsorption data but the experimental equilibrium data fitted well to the Freundlich equation. The Pseudo-second-order rate equation gave a good fit to the experimental data. The study shows that activated groundnut shell represents a good adsorbent for the removal of heavy metals from waste engine oil.