Hexadecyltrimethyl Ammonium (HDTMA) and Trimethylphenyl Ammonium (TMPA) Cations intercalation of Nigerian Bentonite Clay for Multi-component Adsorption of Benzene, Toluene, Ethylbenzene and Xylene (BTEX) from Aqueous Solution: Equilibrium and Kinetic Studies

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Hexadecyltrimethyl Ammonium (HDTMA) and Trimethylphenyl Ammonium (TMPA) Cations intercalation of Nigerian Bentonite Clay for Multi-component Adsorption of Benzene, Toluene, Ethylbenzene and Xylene (BTEX) from Aqueous Solution: Equilibrium and Kinetic Studies

Abstract

Presence of BTEX compounds in water is a global concern. The effectiveness of HDTMA and TMPA cations intercalated Bentonite, corresponding to 100% of CEC in the removal of Benzene, Toluene, Ethylbenzene and Xylene (BTEX) in aqueous solution was assessed. Batch experiments were conducted to determine the influences of contact time and adsorbate concentration on the adsorption efficiency. FTIR spectroscopy, SEM and XRD were used to determine the adsorbent properties. Results showed that surfactant modification of the adsorbent led to structural changes and fractional attainment to equilibrium showed that equilibrium was reached after 120mins. The sorption of BTEX by Bt-HDTMA and Bt-TMPA were in the order of B<T<E<X. The experimental data were fitted by many kinetic and isotherm models. The results also showed that pseudo-second-order kinetic model with highest R2 values ranging from 0.883-0.997 for BTEX gave the

Journal of Analytical Techniques and Research 70

best fit to the experimental data compared to other available kinetic models. Freundlich isotherm model with highest R2 values ranging from 0.979-0.993 for BTEX and n values from 0.55-1.55, fitted to the experimental data better than other isotherm models, confirming Freundlich isotherm as best fit to the sorption process and high efficiency of organoclays for BTEX removal.

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