Preparation of amidoxime‐modified polyacrylonitrile nanofibrous adsorbents for the extraction of copper(II) and lead(II) ions and dye from aqueous media

Abstract

Amidoxime‐modified polyacrylonitrile nanofibrous films (AOPAN NFs) were prepared via an electrospinning technique. The traditional preparation methods for amidoximated polyacrylonitrile (AOPAN) solution were changed and improved. First, the PAN solution was modified by hydroxylamine hydrochloride to produce an AOPAN solution, and then, a small amount of inhibitor was added to the AOPAN solution for electrospinning. We found that the crosslinking of the AOPAN solution was inhibited by the addition of a small amount of inhibitor; at the same time, the storage time of the AOPAN solution was prolonged. In addition, the prepared AOPAN solution was electrospun into nanofibrous films, which could be used as excellent adsorption materials for Cu(II), Pb(II), and methyl orange (MO) after drying. The maximal adsorption capacities for Cu(II), Pb(II), and MO were 143.47, 178.57, and 68.07 mg/g, respectively. The adsorption capacities of the nanofibrous films were more than 50% that of the first adsorption after four recycling runs; this indicated the reusability of the nanofibrous films for water treatment. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45697.

Removal of Cu(II) from Aqueous Solutions Using Amine-Doped Polyacrylonitrile Fibers

“…These results indicated that the adsorption rate of Cu(II) on the surface-modified PAN fibers depended on the adsorbate concentration and the number of active sites of the adsorbent [24]. Previous studies have also revealed that the adsorption of Cu(II) on aminemodified PAN fibers followed the pseudo-second-order kinetic model [2,8,25]. .…”

“…The dependence of the adsorption of Cu(II) on surface-modified PAN fibers on the initial pH of the solution is presented in Figure 6. At low solution pH levels, the modified amine groups are protonated and the surface of the adsorbent is more positively charged, which is not favorable for the adsorption of metal cations [19,25]. The amount of Cu(II) ions adsorbed on the surface-modified PAN fibers increased significantly as the number of protonated amine groups decreased, owing to the increase in the solution pH [2].…”

Sequestration of p-nitrophenol from liquid phase by poly(acrylonitrile-co-acrylic acid) containing thioamide group

“…After chemical modification with TU, the FTIR spectra of polymer had showed significant changes, where the adsorption peak at 2,244 cm À1 had disappeared and new adsorption peaks at 1,614 cm À1 and 729 cm À1 had appeared. This can be attributed to the C ¼ N group and stretching vibration of C ¼ S bonds, respectively (Karthik et al 2017;Ren et al 2018). This had indicated that the chemical modification with TU was successful and thioamide groups were incorporated to the surface of polymer.…”

“…The adsorption peaks determined at 3,516 cm À1 could attribute to the O-H groups, while the characteristic peak found in 2,932 cm À1 are assigned to the stretching modes of C-H bonds (Buapeth et al 2019). The adsorption peaks of 2,244 cm À1 and 1,725 cm À1 represented the nitrile group (C≡N) and carbonyl group (C ¼ O), respectively (Yang et al 2017;Ren et al 2018). After chemical modification with TU, the FTIR spectra of polymer had showed significant changes, where the adsorption peak at 2,244 cm À1 had disappeared and new adsorption peaks at 1,614 cm À1 and 729 cm À1 had appeared.…”

Modified Electrospun Polymeric Nanofibers and Their Nanocomposites as Nanoadsorbents for Toxic Dye Removal from Contaminated Waters: A Review

“…However, the adsorption ability of PAN nanofibers for dyes removal from aqueous solutions still week due to its hydrophobic nature. Therefore, the surface modification of PAN nanofibers is an effective way to increase its hydrophilicity properties as well as the adsorption sites on the surface with keeping its morphology [154][155][156]. For example, Patel and Hota prepared PAN nanofibers and carboxylate-functionalized by alkaline hydrolysis using sodium hydroxide and sodium bicarbonate [157].…”