Dyes are one of the most important industrial pollutants, especially in textile industries. Many methods have been proposed in order to remove color from wastewater among which, adsorption is more acceptable due to the ability for its use in the large scale. In this work the activated Borassus flabellifer bark nano carbon (ABNC) has been applied for removal of the malachite green dye from aqueous environments. The effect of pH, contact time, initial concentration and amount of adsorbent were studied. In order to investigate the mechanism of the adsorption process, several kinetic models including pseudo-first order, pseudo-second order and intra-particle diffusion were used. In addition, equilibrium data was fitted on to Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Hurkins-Jura, Halsay, Radlich-Peterson, Jovanovic and BET isotherm models. Results showed that the adsorption of the malachite green was enhanced with increasing initial dye concentration, pH and contact time. The optimum pH was 9. The qmax for adsorption of malachite green dye from the Langmuir model was 15.87 mg/g. considering the values of r2 (0.999) and χ2, Freundlich isotherm model and pseudo-second order kinetic model had the best fitness. This study has demonstrated that the ABNC with H2SO4 can be employed as effective and inexpensive adsorbent for the removal of malachite green from aqueous environments.
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2022: 6.012
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