Thiol–ended polycaprolactone: Synthesis, preparation and use in Pb(II) and Cd(II) removal from water samples
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Date
2021
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Abstract
In the present study, thiol–ended polycaprolactone (TPCL) was successfully prepared by “ring opening polymerization” using 2-3 dimercaptopropanol and caprolactone. The synthesized material was employed as a possible adsorbent for removal of Cd(II) and Pb(II) ions from water samples and the influence of essential parameters (pH of 5.0, adsorbent dosage of 10.0 mg and contact time of 30.0 min) on the adsorption process was studied. Different techniques (BET NMR, FTIR, zeta potential, TGA/DTG) were used to characterize physical and chemical properties of the polymer. Various isotherm and kinetic models were employed to understand plausible mechanisms involved in the adsorption. It is revealed that adsorption process fitted very well with the Langmuir isotherm and pseudo-second-order kinetic models for both of the ions. The adsorption capacity decreased slightly (< 10%), demonstrating the thiol–ended polycaprolactone performance even after four consecutive adsorption–desorption cycles. The spike recovery studies with real water samples yielded recoveries of over 90% which indicated the applicability of the method. As a result, thiol–ended polycaprolactone has been demonstrated to be effective sorbent for the removal of Cd(II) and Pb(II) ions from aqueous solution, indicating its potential relevance in water remediation. © 2021 Elsevier Ltd