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Title: | New Chelate Resins Prepared with Direct Red 23 for Cd2+, Ni2+, Cu2+ and Pb2+ Removal | Authors: | Marin, Nicoleta Mirela Ficai, Anton Constantin, Lucian Alexandru Motelica, Ludmila Trusca, Roxana |
Affiliations: | National Research and Development Institute for Industrial Ecology, ECOIND University Politehnica of Bucharest, Romania National Research and Development Institute for Industrial Ecology, ECOIND University Politehnica of Bucharest, Romania University Politehnica of Bucharest, Romania |
Keywords: | Amberlite XAD7HP;Amberlite IRA 402;Ion exchange mechanism;π-π interactions;Chelation;Simultaneous enrichment;Higher selectivity;Cadmium;Nickel;Copper;Lead | Issue Date: | Dec-2022 | Publisher: | MDPI | Abstract: | In this paper, two chelate resins prepared by a simple procedure were used for the removal of Cd2+, Ni2+, Cu2+, and Pb2+ (M2+) from aqueous solutions. Amberlite IRA 402 strongly basic anion exchange resin in Cl− form (IRA 402(Cl−) together with Amberlite XAD7HP acrylic ester copolymer (XAD7HP) were functionalized with chelating agent Direct red 23 (DR 23). The chelate resins (IRA 402-DR 23 and XAD7HP-DR 23) were obtained in batch mode. The influence of interaction time, pH and the initial concentration of DR 23 solution was investigated using UV-Vis spectrometry. The time necessary to reach equilibrium was 90 min for both resins. A negligible effect of adsorption capacity (Qe) was obtained when the DR 23 solution was adjusted at a pH of 2 and 7.9. The Qeof the XAD7HP resin (27 mg DR 23/g) is greater than for IRA 402(Cl−) (21 mg DR 23/g). The efficiency of chelating resins was checked via M2+ removal determined by the atomic adsorption spectrometry method (AAS). The M2+ removal by the IRA 402-DR 23 and XAD7HP-DR 23 showed that the latter is more efficient for this purpose. As a consequence, for divalent ions, the chelated resins followed the selectivity sequence: Cd2+ > Cu2+ > Ni2+ > Pb2+. Additionally, Cd2+, Cu2+, and Ni2+ removal was fitted very well with the Freundlich model in terms of height correlation coefficient (R2), while Pb2+ was best fitted with Langmuir model for IRA 402-DR 23, the Cu2+ removal is described by the Langmuir model, and Cd2+, Ni2+ and Pb2+ removal was found to be in concordance with the Freundlich model for XAD7HP-DR 23. The M2+ elution from the chelate resins was carried out using 2 M HCl. The greater M2+ recovery from chelating resin mass confirmed their sustainability. The chelate resins used before and after M2+ removal by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analysis were evaluated. |
Description: | Polymers, vol. 14, 2022, 5523. https://doi.org/10.3390/polym14245523 |
URI: | http://hdl.handle.net/123456789/1968 |
Appears in Collections: | Articles |
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polymers-14-05523.pdf | Article | 1.54 MB | Adobe PDF | View/Open |
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