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Adsorption characteristics of Artocarpus odoratissimus leaf toward removal of toxic Crystal violet dye: Isotherm, thermodynamics and regeneration studies

Journal of Environment & Biotechnology Research, Vol. 4, No. 1, Pages 32-40, July 2016

Linda B. L. Lim, Namal Priyantha, Hui Hsin Cheng, Nur Afiqah Hazirah Mohamad Zaidi

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ABSTRACT

Artocarpus odoratissimus leaf (AOL) was investigated in this study as a potential low-cost adsorbent for the removal of toxic crystal violet (CV) dye. Experimental data obtained from batch adsorption isotherm studies were analyzed using six isotherm models namely the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlich-Peterson and Sips. Based on R² and error values, as well as comparison of experimental data with simulation plots of these various isotherm models, it was concluded that the Langmuir was the best fit isotherm model with maximum adsorption capacity (q_max) of 50.5 mg/g. AOL displayed resilience when tested against various medium pH. However, ionic strength influenced the ability of AOL to adsorb CV, in particular KCl showed a greater influence than KNO₃. The adsorbent also showed potential to be regenerated and reused under both acid and basic treatment, maintaining high adsorption of CV even after four consecutive cycles.
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