Radiation grafting of acrylic acid and N‐vinyl imidazole onto polyethylene films for lead‐ion removal: A two‐dimensional correlation infrared spectroscopy investigation

Abstract

Two-dimensional infrared (IR) correlation spectroscopy was used to follow the g-radiation grafting of N-vinyl imidazole (VIm) and acrylic acid onto polyethylene films. Grafting was confirmed by the appearance of new characteristic IR bands at 1715, 1735, 1475, and 1405 cm 21 , which were assigned to carboxylic groups and the stretching vibrations of aromatic C@N and CAN bonds, respectively. The adsorption of lead ions by the grafted polymer increased with the degree of grafting, and it showed a tendency to be altered by both the chemical structure of the matrix polymer and the steric hindrance of Pb 21 ions. The previous two factors decreased the basic chelating group activity, imposed steric constraints on the formation of complexes between the Pb 21 and VIm groups, and controlled the coordination of Pb 21 with the ACOO 2 groups. IR spectroscopy combined with two-dimensional correlation spectroscopy provided a powerful tool for investigating the interactions between heavy metals and functional groups.

Two-dimensional FTIR spectroscopic analysis of crystallization in cross-linked poly(ether ether ketone)

“…2D-COS was first introduced to vibrational spectroscopy by Isao Noda [14] to simplify the complicated spectra, improve spectral resolution through the spreading of peaks over a second dimension and overcome the limitation encountered in 1D spectroscopy, i.e., the overlapped molecular events and weak signal-to-noise ratio (SNR). Since then, 2D-COS has been successfully applied for a wide range of spectroscopic analysis [15][16][17]. Another important feature of 2D-COS spectra is that they enable the determination of specific sequential order of spectral intensity changes that could be useful to study the mechanism of some processes [14,18].…”

Microfibrillated cellulose reinforced poly(vinyl imidazole) cryogels for continuous removal of heavy metals

“…The structure of the poly(VIM)/MFC cryogel was analyzed by FTIR spectra shown in Figure 3(a). The characteristic stretching vibration bands of VIM appeared at around 1230 cm −1 (NCN), 1110 cm −1 (ring vibration), 1082 cm −1 (in‐plane ring CH bending), and 918 cm −1 (ring deformation), suggesting the polymerization of VIM into the cryogels 48,49 . The bands at 1726 cm −1 and 1662 cm −1 were assigned to the stretching vibration of the carbonyl group of HEMA and MBA, respectively 35,50 .…”

“…The characteristic stretching vibration bands of VIM appeared at around 1230 cm À1 (N C N), 1110 cm À1 (ring vibration), 1082 cm À1 (in-plane ring C H bending), and 918 cm À1 (ring deformation), suggesting the polymerization of VIM into the cryogels. 48,49 The bands at 1726 cm À1 and 1662 cm À1 were assigned to the stretching vibration of the carbonyl group of HEMA and MBA, respectively. 35,50 The results demonstrated the polymerization of HEMA and MBA into the poly(VIM-HEMA) cryogel and MBA into the poly(VIM)/MFC cryogel.…”

Preparation and characterization of core‐shell structured nanocomposite materials and their adsorption behavior on U (VI) from aqueous solutions

“…Actually, adsorption technique is considered as the most popular method for removal of contamination due to its economical and efficiency value. [6][7][8][9] Searching for the effective adsorbent with high adsorption capacity, large surface area, fast adsorption kinetics, and good stability at a wide pH range is a key factor in the adsorption process. [10] Traditional adsorbents such as natural materials suffer from either low adsorption capacities or efficiencies.…”

“…The low‐level concentration of uranium with other interference competing ions makes the quantitative determination of U (VI) challenging. [ 3–5 ]…”