The locally available adsorbent pine apple peel ( Ananascosmosus ) has been tested by preparing a... more The locally available adsorbent pine apple peel ( Ananascosmosus ) has been tested by preparing activated carbon by KOH activation for its effectiveness in removing hexavalent chromium and divalent lead present in the water at low concentrations. Batch adsorption method has been employed to investigate the efficiency of the adsorbent. Adsorption parameters like adsorbent dose, p H, contact time and temperature have been obtained. Adsorption isotherms Freundlich and Langmuir, which states that heterogeneity of the adsorbent surface, were tested and the data obtained best fits to Freundlich model. The adsorption kinetics follow pseudo-second-order kinetic model. Thermodynamic parameters for Pb (II) and Cr (VI) adsorption, enthalpy change, (-0.149 and -0.081kJ/mol), entropy change (0.183 and 0.012kJ/mol), and Gibbs free energy change (-3.138 and -3.554 kJ/mol at 293 K, -3.191 and -3.615 kJ/mol at 298 K, -3.245 and -3.675 kJ/mol at 303 K), respectively have been calculated. The results ...
Technium: Romanian Journal of Applied Sciences and Technology
Thermodynamic and kinetics (pseudo first, pseudo second) of phenol adsorption were investigated.... more Thermodynamic and kinetics (pseudo first, pseudo second) of phenol adsorption were investigated. Anchote peel (coconia Abysinica peel) was carbonized and activated by treating with KOH solution followed by heating in an electrical furnace at 800 for 2 hrs. Kinetic studies of the data showed that the adsorption follows the pseudo-second-order kinetic model. Thermodynamic parameters showed that adsorption on the surface of APAC was feasible, spontaneous in nature, and exothermic. The equilibrium data better fitted the Freundlich isotherm model. Maximum adsorption efficiencies of Phenol were 97% at optimum pH 6 and optimum contact time 210 min., adsorbent dose 0.25 g and initial conc. 0.025 mg/l respectively. Maximum adsorption capacity of APAC was observed to 43.75 mg/g of Phenol at 25 and 5 mg/L. Key words:
The locally available adsorbent pine apple peel ( Ananascosmosus ) has been tested by preparing a... more The locally available adsorbent pine apple peel ( Ananascosmosus ) has been tested by preparing activated carbon by KOH activation for its effectiveness in removing hexavalent chromium and divalent lead present in the water at low concentrations. Batch adsorption method has been employed to investigate the efficiency of the adsorbent. Adsorption parameters like adsorbent dose, p H, contact time and temperature have been obtained. Adsorption isotherms Freundlich and Langmuir, which states that heterogeneity of the adsorbent surface, were tested and the data obtained best fits to Freundlich model. The adsorption kinetics follow pseudo-second-order kinetic model. Thermodynamic parameters for Pb (II) and Cr (VI) adsorption, enthalpy change, (-0.149 and -0.081kJ/mol), entropy change (0.183 and 0.012kJ/mol), and Gibbs free energy change (-3.138 and -3.554 kJ/mol at 293 K, -3.191 and -3.615 kJ/mol at 298 K, -3.245 and -3.675 kJ/mol at 303 K), respectively have been calculated. The results ...
Technium: Romanian Journal of Applied Sciences and Technology
Thermodynamic and kinetics (pseudo first, pseudo second) of phenol adsorption were investigated.... more Thermodynamic and kinetics (pseudo first, pseudo second) of phenol adsorption were investigated. Anchote peel (coconia Abysinica peel) was carbonized and activated by treating with KOH solution followed by heating in an electrical furnace at 800 for 2 hrs. Kinetic studies of the data showed that the adsorption follows the pseudo-second-order kinetic model. Thermodynamic parameters showed that adsorption on the surface of APAC was feasible, spontaneous in nature, and exothermic. The equilibrium data better fitted the Freundlich isotherm model. Maximum adsorption efficiencies of Phenol were 97% at optimum pH 6 and optimum contact time 210 min., adsorbent dose 0.25 g and initial conc. 0.025 mg/l respectively. Maximum adsorption capacity of APAC was observed to 43.75 mg/g of Phenol at 25 and 5 mg/L. Key words:
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