Aminated Polyacrylonitrile Nanofiber Membranes for the Removal of Organic Dyes

Abstract

Adsorption is a promising technique for the effective removal of dyes from dyeing wastewater resulting from the paper, textile, and leather industries. Herein, we report a facile strategy for preparing adsorption membrane-based aminated ultrathin polyacrylonitrile (UPAN-N) nanofibers to effectively remove the synthetic dyes from wastewater. The UPAN-N nanofibers were synthesized using a mixed solution electrospinning procedure, followed by triethylenetetramine modification. After the amino modification, the surface of the obtained UPAN-N nanofiber membrane is rich in amino groups, which endows the resulting membrane with an ultrahigh adsorption capacity of more than 1800 mg/g for the organic dye DR23 and a rapid adsorption rate for DR23 solutions with the concentrations ranging from 20 to 100 mg/L. This work not only provides a feasible method for the preparation of high-capacity adsorbents but also offers the possibility of preparing nanofibers by a mixed solution electrospinning procedure.

Nanostructured Materials for Water Purification: Adsorption of Heavy Metal Ions and Organic Dyes

“…The electrospinnun polymer nanofiber membranes have a high aspect ratio and surface adsorption energy, providing an effective adsorbent material that can be regenerated without secondary contamination [ 230 , 231 , 232 , 233 ]. Recently, Zhao et al reported a simple strategy to fabricate amine-functionalized ultrathin polyacrylonitrile nanofiber of 100 nm diameter using a mixed solution electrospinning procedure, to efficiently remove organic dyes from aqueous media [ 234 ]. The ultrathin polyacrylonitrile nanofiber membrane possesses abundant amino groups on the surface, contributing to its ultrahigh adsorption capacity of more than 1800 mg g −1 and rapid adsorption rate with concentrations ranging from 20 to 100 mg L −1 for organic dye, Direct Red 23.…”

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“…9,10 These complicated components of industrial wastewater can harm organisms through ingestion or accumulation, causing great physiological abnormalities. 11,12 Therefore, it is of vital importance to fabricate a modified method for emerging wastewater hazards. 13…”