An evaluation of comparative biosorption study of Cadmium (II) and Chromium (VI) using Orange rind (Citrus sinensis), (L.) Osbeck, under optimized conditions
Keywords:
Comparative study, Biosorption, Cadmium (II), Chromium. (VI), Orange (Citrus sinensis), (L.) Osbeck, FTIR, SEM, Adsorption isotherms, Adsorption kinetics, Thermodynamic studyAbstract
The present study investigated the comparative biosorption study of cadmium (II) and chromium (VI) using inexpensive biosorbentrind of orange (Citrus sinensis), (L.) Osbeck, under optimized conditions. A biosorption study was carried out in batch system from aqueous solutions. The biosorbent before and after biosorption was characterized by FTIR and SEM. The work considered the optimization of parameters such as solution pH, biosorbent dose, initial metal concentration, contact time and temperature. To assess the potential applicability of biosorbent, the experimental equilibrium data were analysed by Langmuir, Freundlich, Dubinin-Kaganer-Redushkevich (DKR) and Temkin isotherms. Langmuir isotherm model provided a better fit with the experimental data for both cadmium (II) and chromium (VI). The maximum biosorption capacity of cadmium (II) and chromium (VI) which was determined from Langmuir isotherm was found to be 83.33mgg-1and 10.74mg g-1respectively. Simple kinetic models such as pseudo-first-order, pseudo-second-order, Elovich and Weber & Morris intraparticle rate diffusion, were employed to determine the biosorption mechanism. A result clearly indicates that the pseudo-second-order kinetic model was found to be correlating the experimental data strongest for both cadmium (II) and chromium (VI), which suggests that chemical adsorption process was more dominant. Thermodynamic study revealed that the biosorption process was spontaneous, endothermic and increasing randomness of the solid solution interfaces. The rind of orange (Citrus sinensis), (L.) Osbeck was found to remove cadmium (II) and chromium (VI) effective from aqueous solutions with uptake and selectivity in the order of cadmium (II) > chromium (VI).Thus biosorption have an advantages over other expensive cleanup technologies, can be used for waste water treatment for remediation of heavy metal contamination in industrial sectors.
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