BIOSORPTION OF COPPER CU (II) INTO BIOMASS CACTUS RACKETS OF THE MOROCCAN REGION OF ...........

The biosorption of copper Cu(II) ions was examined utilising biomasses (opuntia ficus-indica). pH, contact time, biomass dosage, and temperature were all investigated as experimental parameters that affect the biosorption process. The biosorption isotherms were described using the Langmuir, Freundlich, and Dubinin–Radushkevich (D–R) models. The Freundlich isotherm did not fit the equilibrium data as well as the Langmuir model. At pH 5, 1g biomass dosage, 60 min equilibrium period, and 22°C, the biosorption capacity of biomass (opuntia ficus-indica) for total copper was reported to be 56.69 mg/g. The mean free energy of total copper biosorption was computed as 6.24 kJ/mol using the D–R isotherm model, indicating that chysisorption was used. At 22–45°C, the computed thermodynamic parameters (G°, H°, and S°) revealed that copper biosorption onto biomass (opuntia ficus-indica) was possible, spontaneous, and exothermic. The biosorption processes of copper followed pseudo-second-order kinetics, according to kinetic analysis of experimental data.

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