| Abstrakt: |
Purpose: Modified biopolymers have attracted considerable attention in water treatment recently due to the natural availability, environmental compatibility, cheap price etc. Methods: In the present study, Chitosan Nanoparticles-Alginate/ Methyl Acrylate (CS NPs-Alg/MA) beads were prepared. They successfully applied as an adsorbent in the process of removing harmful Pb2+ions from their aqueous solutions. SEM, EDX, and FTIR studies to characterize the structure of the modified materials before adsorption were used. Varied factors of Pb2+ions adsorption including contact time, pH of solutions, adsorbent dosage, and initial concentration of the metal ions were studied for optimizing the adsorption efficiency of the (CS NPs-Alg/MA) beads. Results: According to the findings, the equilibrium uptake increased as the metal ion concentration increased, and the maximum adsorption capacity found to be 80.6 mg/g for Pb2+ions. In addition, kinetics and isotherms were applied to the process of adsorption to understand better the fundamentals underlying this process and how it occurs. R2values for Langmuir isotherm model (R² = 0.9998) were greater than those for Freundlich model’s correlation coefficients (R² = 0.823). Therefore, it was evident that Langmuir model adequately explained Pb2+ions adsorption onto CS NPs-Alg/MA adsorbent. Moreover, the kinetics of the adsorption was consistent with a pseudo-second-order model. The prepared beads were regenerated well using a dilute acidic solution and still maintained good adsorption capacity after regeneration. Conclusions: The synthesized (CS NPs-Alg/MA) beads can be a successful adsorbent for Pb2+ions from their aqueous environment. |
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