Preparation of amidoxime surface-functionalized polyindole (ASFPI) nanofibers for Pb(ii) and Cd(ii) adsorption from aqueous solutions

Abstract

Amidoxime surface-functionalized polyindole (ASFPI) nanofibers were prepared by electrospinning of chemically synthesized poly(5-cyanoindole) followed by surface modification. The as-prepared ASFPI nanofibers were characterized with FTIR, SEM, BET surface areas and water contact angle measurement.Meanwhile, the adsorption properties and mechanism of ASFPI nanofibers towards Pb(II) and Cd(II) in aqueous solution were mainly investigated by a batch method. It was found that ASFPI nanofibers showed a high affinity towards Pb(II) and Cd(II). The maximum adsorption capacities were found to be 307.44 and 108.49 mg g À1 for Pb(II) and Cd(II), which are markedly high values compared to other fiber adsorbents reported. The adsorption isotherms were better fitted with the Langmuir model rather thanFreundlich and Temkin models. The kinetics data analysis showed that the adsorption process could be described by a pseudo-second order kinetic model, suggesting a chemisorption process as the rate limiting step. Thermodynamic parameters revealed the spontaneity of the adsorption process and higher temperature favored adsorption. Regeneration tests showed that ASFPI nanofibers could be reused repetitively for 10 times with 80% of the initial adsorption capacity.

Preparation and Characterization of a Novel Activated Carbon@Polyindole Composite for the Effective Removal of Ionic Dye from Water

“…For example, PIN nanofibers were used for adsorption of copper (II) by Zhijiang et al [ 12 ]. Similarly, Cai, Z. et al [ 13 , 14 ] prepared surface-functionalized PIN nanofibers for effective removal of Cr(VI), Pb(II), and Cd(II) from aqueous solutions. Besides, polyacrylonitrile/PIN composite and zinc oxide/magnesium oxide/PIN have been used for Cu(II) and Pb(II), respectively [ 15 , 16 ].…”

Amidoxime-Functionalized Macroporous Carbon Self-Refreshed Electrode Materials for Rapid and High-Capacity Removal of Heavy Metal from Water

“…Polyacrylonitrile (PAN) and Super P (active carbon) were mixed with DMF to get a PAN/C slurry and was coated on the surface of CF to get PAN/C@CF (PCCF). After reaction with hydroxylamine hydrochloride, most of the nitrile groups are replaced by amidoxime groups, − forming the modified electrode, herein referred to as PAN-ami/C@CF (PACCF). As seen by SEM, this amidoxime-modified CF consists of fibers with 20 μm diameter that were coated with a very thin polymer layer (Figure c).…”

Combined Approach To Remove and Fast Detect Heavy Metals in Water Based on PES–TiO2 Electrospun Mats and Porphyrin Chemosensors

“…In fact, it has been demonstrated that an increase in the initial metal ion contributes to overcome mass transfer resistance between solid/solution interfaces. 40,41…”

“…In fact, it has been demonstrated that an increase in the initial metal ion contributes to overcome mass transfer resistance between solid/solution interfaces. 40,41 The fabricated mats are extremely stable in water, easy to handle, and robust, thus allowing for a prolonged use (up to complete removal of ionic species) without any release of both fibrous material as well as adsorbed species.…”