J. Bio. Env. Sci.5(4), 239-249, October 2014
The adsorption capacity of prepared vegetable waste mixture to remove Cd (II) and Cu (II) ions from their respective aqueous solutions was investigated in a batch experimental setup. Maximum uptake capacity of biomass for Cd (II) (303.03 mg/g) and Cu (II) (1000 mg/g) was observed at pH 7 and 2, respectively. The optimized biosorbent dosage of 3.0 g was found to remove metal concentration of 110 ppm of Cd (II) and 30 ppm of Cu (II) ions at temperatures 45°C and 50°C, respectively. The system attained equilibrium when contact time for Cd (II) was 30 minutes while for Cu (II) it was 45 minutes. FT-IR and ICP studies of neat and metal loaded biomass also revealed the presence of Cd (II) and Cu (II) onto the biomass. Kinetic studies showed that Cd (II) and Cu (II) adsorption on the prepared biosorbent follows a pseudo-second order reaction, while the system fits well in the Langmuir isotherm model. The present study revealed that the metal uptake capacity of prepared biomass is significantly higher as compared to the work reported earlier.
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