Poly(vinylbenzyl Pyridinium Salts) as Novel Sorbents for Hazardous Metals Ions Removal

Abstract

Novel efficient complexing resins—poly(vinylbenzyl pyridinium salts) fabricated through poly(vinylbenzyl halogene-co-divinylbenzene) quaternization of N-decyloxy-1-(pyridin-3-yl)ethaneimine and N-decyloxy-1-(pyridin-4-yl)ethaneimine—were tested as adsorbents of Pb(II), Cd(II), Cu(II), Zn(II), and Ni(II) from aqueous solutions. The structure of these materials was established by 13C CP-MAS NMR, X-ray photoelectron spectroscopy, elemental analysis, and Fourier transform infrared spectroscopy, as well as thermogravimetric and differential thermal analyses. The textural properties were determined using scanning electron microscopy and low-temperature N2 sorption. Based on the conducted sorption studies, it was shown that the uptake behavior of the metal ions towards novel resins depended on the type of functionalities, contact time, pH, metal concentrations, and the resin dosage. The Langmuir model was investigated to be the best one for fitting isothermal adsorption equilibrium data, and the corresponding adsorption capacities were predicted to be 296.4, 201.8, 83.8, 38.1, and 39.3 mg/g for Pb(II), Zn(II), Cd(II), Cu(II), and Ni(II), respectively. These results confirmed that owing to the presence of the functional pyridinium groups, the resins demonstrated proficient metal ion removal capacities. Furthermore, VBBr-D4EI could be successfully used for the selective uptake of Pb(II) from wastewater. It was also shown that the novel resins can be regenerated without significant loss of their sorption capacity.

Changes in permselectivity of radiation-grafted anion-exchange membranes with different cationic headgroup chemistries are primarily due to water content differences

“…1 top) confirmed successful reaction of the ETFE- g -poly(VBC) with the quaternising agents due to the general absence of the 1268 cm −1 band. The average spectrum of TMA-L contains the expected bands at 757 and 978 cm −1 , 5,7 while that of MPIP-L contains diagnostic bands at 706 and 1275 cm −1 , 3,5 PYR-L contains intense bands at 1029 and 1636 cm −1 , 8 and DMI-L contains intense bands at 726 and 1516 cm −1 . 6…”

“…Different cationic headgroups in RG-AEMs have highly diagnostic bands. 3,[5][6][7][8] The spectra were recorded on a Renishaw InVia Reflex Raman Microscope (Renishaw, UK) using a 785 nm near IR excitation laser and a 50× objective (NA = 0.5, ca. 2 µm laser Airy spot size).…”

“…Different cationic headgroups in RG-AEMs have highly diagnostic bands. 3,[5][6][7][8] The spectra were recorded on a Renishaw InVia…”