Elucidating the porous and chemical structures of ZnCl2-activated polyacrylonitrile on a fiberglass substrate

Abstract

ZnCl 2 -activated polyacrylonitrile (PAN) coated onto a fiberglass substrate was prepared in N 2 at 450 uC. The porous and chemical structures were characterized by using N 2 adsorption at 77 K, XPS, FTIR, competitive adsorption of CO 2 /CH 4 and the adsorption of Cs + , Sr 2+ and Ag + . The activated PAN displays a high BET surface area up to 1012 m 2 g 21 , a broad mesopore size distribution as well as a major micropore size distribution. Up to 19.3 wt% of nitrogen, which is probably in the form of pyridinic and pyrrolic structures, is incorporated in the chemically activated PAN. HCl uptake results show that such a material has a higher amount of weakly basic functional groups compared to a commercially available ACF15. The activated PAN also exhibits a higher selectivity coefficient for CO 2 /CH 4 at STP and higher adsorption amounts for Cs + , Sr 2+ and Ag + than ACF15. It is proposed that nitrogen-containing, weakly basic functional groups positioned on the suitable-sized pore walls improve the adsorption ability of the activated PAN toward CO 2 , Cs + , Sr 2+ and Ag + .

Highly Sensitive Surface-Enhanced Raman Spectroscopy Substrates of Ag@PAN Electrospinning Nanofibrous Membranes for Direct Detection of Bacteria

“…For Ag@PAN composite nanofibers, the peak at 284.6 eV related to C (1s) and the peak at 398.4 eV related to N (1s) are observed, indicating the existence of PAN. 26 Moreover, Figure 3 cshows that the binding energy of Ag 3d 5/2 and Ag 3d 3/2 is located at 368.2 and 374.2 eV, respectively. 27 Furthermore, the splitting energy of the Ag 3d doublet, as shown in Figure 3 c, is 6.0 eV, which verifies that composite nanofibers contain metallic Ag (Ag 0 ) on the PAN surface but do not contain Ag + .…”

Controlling the Optical, Electrical and Chemical Properties of Carbon Inverse Opal by Nitrogen Doping

“…For the C 1s signal, all the samples exhibited peaks assigned to C-O (286 eV), C=O (286.7), and O-C=O (287.5 eV). [40][41][42][43] the solution, the degree of crystallization of the N-doped CIO is reduced (Figure 3 b). Furthermore, when the position of the D-and G-bands were analyzed, we found a clear upshift for the D peak when increasing the amount of pyrazine used for synthesis from ≈1344 cm −1 to ≈1358 cm −1 (see Table 1 ).…”

“…[ 41,43,44 ] The atomic concentrations obtained from the XPS analysis indicate that samples contain 1.05 at%, 2.43 at%, and 5.48 at% of nitrogen for CIO300-N1, CIO300-N2, and CIO300-N3, respectively (see Table 2 ).…”

Hollow Nanotubes of N‐Doped Carbon on CoS

“…On heating in a Teflon‐lined stainless‐steel autoclave at 220 °C, the solid PAN film disappears and the color of the solution changes to a brownish red (Figure b); the Tyndall effect can be observed in the red solution, indicating the formation of colloids. After drying, some solid blocks are obtained, and Fourier‐transform infra‐red (FTIR) spectroscopy analysis of these blocks shows the disappearance of the 2245 cm −1 band corresponding to the CN groups of PAN (Figure c) . Three new bands at 3163, 1655, and 1404 cm −1 can be attributed, respectively, to OH − stretching vibrations and the asymmetric and symmetric stretching vibrations of COO − units .…”