Design of High Efficiency Chelate Fibers with an Amine Group To Remove Heavy Metal Ions and pH-Related FT-IR Analysis

Abstract

We have been searching a new ion exchange material in the form of a fiber which could get large advantages over the conventional bead type. In this approach, an effective chelating fiber is prepared by the coupling of polyacrylonitrile (PAN) and ethylenediamine. A synthesized ion exchange fiber (poly(acrylo-amidino ethylene amine), PAEA) achieved 7.8 mequiv/g of adsorption capacity in a batch test. The coupling process and capacity were confirmed through FT-IR, acid−base neutralization titration, ICP, IC, and AAS. By means of verifying the bonding peaks (hydrogen and ionic bonding) under several pHs, molecular bonding between PAEA and ions (Cu2+ and CrO4 2-) was certified. Surface morphologies of chelating fibers and also after metal ion adsorption were examined by AFM. Compared with a batch test, the adsorption ability was low due to the diffusion path of ions in the dynamic test.

Perconcentration of Ni(II) from Sample Water by Modified Nano Fiber

“…where EA is the content of MMA groups in the fiber(mol/g),W 1 is the weight of the dry fiber after reaction (g), W 0 is the weight of the dry fiber before reaction (g),M 0 is the molecular weight chain unit CH 2 CHCN(53), AND M 1 is the molecular weight of NH 2 (CH 2 ) 2 OH 31,32 .…”

“…In our previous attempts, we modified SPE membrane disks with suitable compounds for selective determination of chromium [18][19]35 and lead 20 .Meanwhile, other investigators have successfully utilized these sorbents for quantitative extraction and monitoring trace amounts of lead [21][22][23] , copper [24][25][26] , silver [27][28] , mercury [29][30] , cadmium 31 , palladium 32 , Ce 33 and UO 2 34 .…”

Ion adsorption studies of micro and nano acrylic fibers modified by ethanolamine

“…where EA is the content of MEA groups in the fiber(mol/g), W 1 is the weight of the dry fiber after reaction (g), W 0 is the weight of the dry fiber before reaction (g), M 0 is the molecular weight chain unit CH 2 CHCN(53), AND M 1 is the molecular weight of NH 2 (CH 2 ) 2 OH [20].…”

Efficient adsorption of As(V) on poly(acrylo-amidino ethylene amine) nanofiber membranes

“…The FT-IR spectra of the pure PAN and PAEA nanofibers are shown in Figure 2 stretching in the backbone of the PAN fiber) [12]. After the pure PAN nanofiber is modified, new peaks at 1561 and 1654 cm −1 correspond to -NH bending motion combined with a -CN stretching vibration of the C(=NH)-NHgroup appear and a strong broadband ranging from 3000 to 3500 cm −1 corresponds to the combination of the stretching vibration bands of amine (NH) group, suggesting that NH group was introduced on the surface of the PAEA nanofibers.…”