Solid-phase extraction of Cu2+ and Pb2+ from waters using new thermally treated chitosan/polyacrylamide thin films; adsorption kinetics and thermodynamics |
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Authors: | Yasmeen G. Abou El-Reash Amr M. Abdelghany Kerstin Leopold |
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Affiliation: | 1. Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt;2. Institute of Analytical and Bioanalytical Chemistry, University of Ulm, Ulm, Germanyygaelreash80@yahoo.com;4. Spectroscopy Department, Physics Division, National Research Centre, Cairo, Egypt;5. Institute of Analytical and Bioanalytical Chemistry, University of Ulm, Ulm, Germany |
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Abstract: | New biologically safe thin adsorptive films were synthesised using chitosan/polyacrylamide polymer blend (Ch/PA) via thermal crosslinking technique for the separation of Cu2+ and Pb2+ from aqueous solution and natural water samples. The prepared films were characterised using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and Thermogravimetric analysis (TGA) techniques. Thermo-gravimetric analysis revealed an enhancement in the thermal stability of the prepared thin films with increasing polyacrylamide content. Kinetic and thermodynamic studies were evaluated by batch-type experiments. The obtained results indicated that the adsorption isotherms were well described by Freundlich model, and Ch/PA have adsorption capacities of 177.9 and 126.58 mg.g?1 to Cu2+ and Pb2+, respectively. Under optimum conditions, calculated detection limits were as low as 0.018 and 0.034 μg.L?1 for Cu2+ and Pb2+, respectively, and relative standard deviations of less than 4% for five separate experiments. Moreover, the traditional Lagergren adsorption kinetic model provided the best fitting for the kinetic data. Furthermore, the reusability studies revealed a decrease in the adsorption capacity by about 8% after three adsorption–desorption cycles. The prepared thin films were successfully applied for the separation of Cu2+ and Pb2+ from natural water samples. |
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Keywords: | Solid-phase extraction chitosan/polyacrylamide polymer blend separation of copper and lead adsorption kinetics and thermodynamics |
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