Removal of Toxic Metal Ions Using Poly(BuMA–co–EDMA) Modified with C-Tetra(nonyl)calix[4]resorcinarene

Abstract

A copolymer of poly(BuMA–co–EDMA) modified with C-tetra(nonyl)calix[4]resorcinarene was obtained via the impregnation method. The formation of the modified copolymer was confirmed and investigated using various techniques; in this way, the presence of calix[4]resorcinarene was confirmed by FT-IR spectroscopy and by high resolution transmission electron microscopy. The modified copolymer was used for the removal of highly toxic cations (Pb2+, Hg2+, and Cd2+) from aqueous solutions. To perform the removal, we used the batch sorption technique and the effects of time of contact, pH, and volume of sample on the effective sorption were determined. The best results were observed for Pb2+ extraction, which was comparatively more efficient. Adsorption–desorption experiments revealed that the modified copolymer could be used for several cycles without significant loss of adsorption capacity. Finally, the results showed that the modified copolymer application is highly efficient for the removal of lead ions from aqueous solutions.

Evaluation of a Resorcinarene-Based Sorbent as a Solid-Phase Extraction Material for the Enrichment of L-Carnitine from Aqueous Solutions

“…As shown in Table 1, the characterization of the compounds was performed using ESI-TOF/MS, FT-IR, 1 H-NMR, and 13 C-NMR spectroscopy (Figures S1-S4). Compounds 1-5 had been previously synthesized [39][40][41], and our spectroscopic data agreed with those reported (Figures S5-S18); however, the following aspects should be noted: the signals of the macrocyclic compounds are described and they exhibited similar behavior. The characteristic band for OH was seen in the FT-IR spectrum, and the characteristic bands for aromatic and alkyl substituents were resolved.…”

New Contributions to the Study of the Interaction between Hydrocortisone and Hydroxypropyl-Cyclodextrins in Aqueous Solution

“…Continuing with our research on polyhydroxylated platforms [17][18][19][20], in this article the complexing capacity of three macrocycles systems: 2-hydroxypropyl-α-cyclodextrin, 2hydroxypropyl-β-cyclodextrin and 2-hydroxypropyl-γ-cyclodextrin, with hydrocortisone (Figure 1) were evaluated. The formed complexes were analyzed by using FT-IR and 1 H-NMR spectroscopy.…”