Fabrication of Electrospun Polyamide-6/Chitosan Nanofibrous Membrane toward Anionic Dyes Removal

Abstract

Nanofibrous filter media of polyamide-6/chitosan were fabricated by electrospinning onto a satin fabric substrate and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and water contact angle (WCA). Anionic dye removal capability of the filter was investigated for Solophenyl Red 3BL and Polar Yellow GN, respectively, as acidic and direct dyes were investigated with respect to solution parameters (pH and initial dye concentration) and membrane parameters (electrospinning time and chitosan ratio) through filtration system. Experiments were designed using response surface methodology (RSM) based on five-level central composite design (CCD) with four parameters to maximize removal efficiency of the filter media. Moreover, the effect of parameters and their likely interactions on dye removal were investigated by mathematically developed models. The optimum values for solution pH, initial dye concentration, electrospinning time, and chitosan ratio were predicted to be 5, 50 mg/L, 4 hr, 30% and 5, 100 mg/L, 4 hr, 10%, respectively, for achieving 96% and 95% removal of Solophenyl Red 3BL and Polar Yellow GN. Evaluation of the estimation capability of applied models revealed that the models have a good agreement with experimental values. This study demonstrated that polyamide-6/chitosan nanofibrous membrane has an enormous applicable potential in dye removal from aqueous solutions.

Effect of argon plasma treatment on hydrophilic stability of nanofiber webs

“…The strong peaks at 1642 cm −1 and 1550 cm −1 are assigned to the amide I (CO stretch) and amide II (CN stretch and CONH bend), respectively, for PA6 . Similar to what is found in the literature, peaks at 1171 cm −1 (CH 2 twist wag vibration), 1199 cm −1 (CH 2 twist wag vibration), 1268 cm −1 (CH 2 twist wag vibration), 1440 cm −1 (CH 2 scissors vibration), 2860 cm −1 (symmetric CH 2 stretch), 2928 cm −1 (asymmetric CH 2 stretch), 3082 cm −1 (Fermi resonance of NH stretching with the overtone of amide II), and 3305 cm −1 (hydrogen‐bonded NH stretch in the amorphous phase) are also observed for PA6 [Figure (C)].…”

Modeling and optimization of antibacterial activity of the chitosan‐based hydrogel films using central composite design

“…In Table , number of levels (5 levels for each factor) and range of changes in substance concentration are presented. This design requires an experiment number according to N = k 2 + 2k + C p , where k is the number of factors and C p is the replicate number of the central point . Here, number of factors were 4, and C p = 6 which result in total number of 30 experiments.…”

“…This design requires an experiment number according to N 5 k 2 1 2k 1 C p , where k is the number of factors and C p is the replicate number of the central point. 13 Here, number of factors were 4, and C p 5 6 which result in total number of 30 experiments. The run number of 25-30 which conducted on center point concentration of materials was done as repetition to check the accuracy of tests and avoiding personal errors.…”

Bio‐Based Nanofibers Involved in Wastewater Treatment

“…As a next step, Ghani and coworkers blended chitosan with polyamide‐6 and electrospinning produced nanofibers with improved characteristics including hydrophilicity, biocompatibility, and biodegradability. The experiments were designed using response surface methodology to optimize the best filtration conditions to achieve 96% and 95% removal of Solophenyl Red 3BL and Polar Yellow GN, respectively, mainly attributed to more amount of functional groups present on surface of chitosan as shown in Figure . By embedding SiO 2 nanoparticles onto electrospun chitosan/PVA fiber was to be more effective and stable for a longer time.…”

“…3D surface response plots of the dye removal for the chitosan ratio and solution pH. Reproduced with permission . Copyright 2014, Hindawi.…”