Comparative Adsorption of Crude Oil using Coconut Shell and Coconut Shell Activated Carbon

B. A. Olufemi, A. Otuoze

Abstract


Coconut shell (CS) and Coconut Shell Activated Carbon (CSAC) as effective adsorbents for removal of crude oil were examined in this work through batch experiments. Variation in adsorption efficiencies was observed with respect to adsorbate loading, adsorbent loading, contact time, temperature, rotational speed, and pH of the mixture. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used to study the adsorption of the crude oil for both adsorbents, and it was observed that the mechanism of adsorption was of a multi- molecular-layer in nature. Fourier Transform infrared (FTIR) spectroscopy analyses were also carried out on the two adsorbents, before and after adsorption. The results indicated the presence of crude oil component functional groups on the two adsorbents. Optimum values of the six variable parameters for CS and CSAC adsorption were obtained using design of experiments (DOE). Optimum crude oil removal with CS was 51.32% at pH of 6.9, 49.18°C, mixed for 52.35 minutes at a speed of 347.50 rpm, using 3.76 g absorbent on a 0.06 g/L adsorbate mixture, while 91.25% removal was observed when CSAC was used at optimum pH of 6.2, 62.93°C, mixed for 70.12 minutes at a speed of 482.50 rpm, using 4.26 g absorbent on a 0.07 g/L adsorbate mixture. The enhanced effect from CS activation was justified statistically using ANOVA and Bonferroni-Holm Posthoc significance test, confirming that CS and CSAC are useful for crude oil adsorption.


Keywords


Activated carbon; adsorption; coconut shell; crude oil; optimum parameters

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ISSN : 2180-3811       E-ISSN : 2289-814X

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