In this study, calcined eggshell powder was used as low-cost adsorbent to remove copper (II) ion from aqueous solution by adsorption. Effects of operational parameters such as contact time, adsorbent dosage, initial concentration and temperature were determined for optimum removal. Results shows a maximum removal of 99.96167% at 30 minutes, 1.5g, 300mg/L and 35 . Equilibrium adsorption isotherms, kinetics and thermodynamics were investigated. Langmuir and Freundlich models were used to analyse the experimental data and the isotherm data fitted well to the Langmuir isotherm with monolayer adsorption capacity of 4.5024 mg/g. Adsorption kinetic study revealed that pseudo-second order with correlation coefficient value of 0.9361 best fit to experimental data compared with pseudo-first model. Thermodynamics studies describes the adsorption reaction process as non-spontaneous, increasing in rate with increase in temperature, endothermic and irreversible in nature.
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