Fabrication of Electrospun Polyamide-6/Chitosan Nanofibrous Membrane toward Anionic Dyes Removal (original) (raw)
Related papers
Polymer Bulletin, 2022
Nanofibrous ultrafilter of nylon6.12/chitosan@Poly ether sulfone (N6.12/CS@ PES) membrane were fabricated by chitosan casted PES membrane and coated with nylon6.12 thin layer using electrospinning technique for dye rejection. The membranes were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). The capacity of the membrane to reject both cationic and anionic dyes was evaluated for basic blue dye41 and alizarin red dye, respectively, with regard to solution parameters (pH, Zeta potential, pressure, dye concentration and different electrolyte) through filtration system. In addition, the influence of parameters on dye rejection, as well as their potential interactions, has been investigated. An enhanced hydrophilicity and antifouling property was observed for the composite membrane as compared to pristine PES ultrafiltration membranes. The results show that the rejection of dyes increase with the decreases of operating pressure. At optimum condition of PH = 7, and pressure = 10 bar and concentration = 220 mg/L, the rejection ratio improves from 75.3 to 99.5% and 71 to 82% for basic blue dye41 and alizarin red dye, respectively. Dye rejection is not changed after 7 cycles and not change separation efficiency of dyes. The mechanical and electrical properties were investigated for PES and N6.12/CS@ PES composite membrane. The results showed that the N6.12/CS@PES composite membrane exhibited the highest mechanical properties and the highest dielectric constant especially at low frequencies with low dielectric loss. This study demonstrated that the developed nanofibrous composite membrane were successfully characterized and proved to be a good rejection for dyes from aqueous solutions.
Science of Advanced Materials, 2015
Diethylenetriamine (DETA) grafted polyacrylonitrile ((PAN) DETA-g-PAN) nanofibers (NFs) membrane was prepared by using electrospinning and chemical grafting techniques. Grafting of DETA to PAN was confirmed by Fourier Transform Infrared (FT-IR) spectroscopy. Adsorption kinetics of methylene blue (MB), rhodamine B (RB), and safranin T (ST) dyes onto PAN and DETA-g-PAN NFs membranes showed that adsorption leveled off at ∼60 min. The kinetics data showed good fitting to pseudo second-order model. No change in the intra-particle diffusion pattern was observed for DETA-g-PAN membrane. The equilibrium adsorption data fitted well to Langmuir and Freundlich equations. The correlation coefficient (r 2 ) varied from 0.940-0.995 for Langmuir and 0.941 to 0.999 for Freundlich equation. The maximum adsorption capacities (q max of dyes increased in the order: MB (42.66 mg/g for PAN and 184.84 mg/g for DETA-g-PAN) < ST (72.46 mg/g for PAN and 195.7 mg/g for DETA-g-PAN) < RB (99.31 mg/g for PAN and 367.65 mg/g for DETA-g-PAN). These values are far higher than the values reported in literature.
Sorption Process Using Polyamide Nanofibres to Remove Dye from Simulated Wastewater
2012
The aim of this study was to examine the use of polyamide 6 nanofibers as a sorbent material for removal of dye on textile wastewater. Simulated wastewater of acid dyes (namely Colour Index Acid blue 41, Acid yellow 42 and C.I Acid blue 78) was used for experiment test with simulated concentration of 10 mg L -1 , for sorption process electrospun polyamide 6 with areal weight 12 g m -2 was used as the sorbent material and the process was performed under vacuum pressure. The experiments were realised in temperatures 20, 30, 40, 50 and 60°C. The experimental result showed that the presented study on polyamide 6 nanofibers has a great potential to be used for dye removal, since it was able to absorb dye at room temperature.
Membranes, 2022
Electrospun polyacrylonitrile (PAN) nanofiber membrane was functionalized with chitosan and proteins for use in the treatment of dye-containing wastewater. The PAN nanofiber membrane was subjected to alkaline hydrolysis, before being grafted with chitosan and subsequently the proteins from chicken egg white. The resultant nanofiber membrane (P-COOH-CS-CEW) was comprehensively characterized using thermogravimetric analysis, Fourier-transform infrared spectroscopy, and scanning electron microscopy. The efficiency of P-COOH-CS-CEW in removing cationic dye toluidine blue O (TBO) and anionic dye acid orange 7 (AO7) in aqueous solution was evaluated. Based on the performance of model fitting, Langmuir and pseudo-second-order kinetic model could be used to describe the performance of P-COOH-CS-CEW in the removal of TBO (pH 10) and AO7 (pH 2) from the dye solutions. The adsorbed TBO and AO7 dyes can be completely desorbed by an elution solution made of 50% (v/v) ethanol and 1 M sodium chlor...
A Review of Dye Removal Using Polymeric Nanofibers by Electrospinning as Promising Adsorbents
Journal of Water and Wastewater, 2023
Water is the most important material that humans and creatures need, and water contamination caused by chemicals such as dyes has brought many problems. Various methods have been used to remove dyes as organic contaminants. Polymeric nanofibers prepared by electrospinning have a nanostructure with a high adsorption capacity for removing water contaminants. To solve this problem, the adsorption process is used, which is very effective for removing water pollutants. The adsorption process is very important in terms of expense and reuse. The use of natural polymers is being promoted as a suitable alternative to synthetic polymers and to reduce environmental pollution. The results indicate that preparing nanofibers by electrospinning and using them as adsorbents is a suitable method to remove contaminants. The effect of operational parameters on the adsorption removal ability of polymeric nanofibers, the optimal adsorption conditions, and the mechanism of dye adsorption have been investigated in detail. The data indicated that polymeric electrospinning nanofibers can be used as environmentally friendly and effective adsorbents for removing water contaminants. Also, the treated dye wastewater is reused in the dyeing process and is not discharged into the environment to conquer the water shortage.
Electrospun nanofiber membranes for adsorption of dye molecules from textile wastewater
IOP Conference Series: Materials Science and Engineering
The nanofiber membranes prepared by the electrospinning method have unique properties such as high specific surface area and high porosity with fine pores. These properties led electrospun nanofiber membranes to use for the removal of dye molecules from textile wastewater. In this study, a hydrophobic Thermoplastic Polyurethane (TPU) and a hydrophilic Poly (vinyl alcohol) (PVA) were selected for producing electrospun nanofibers and their sorption capacities were investigated. The largest sorption capacity reached to maximum 88.31 mg/g, belong to BTCA cross-linked PVA membranes due to hydrophilic character of PVA. Contrary to expectation, hydrophobic character of TPU was dominant and incorporation of CD to the TPU nanofibers did not affect the sorption of the TPU membranes, and showed very low adsorption capacity (14.48 mg/g).
Recycling of Direct Dyes Wastewater by Nylon-6 Nanofibrous Membrane
Current Nanoscience, 2011
ABSTRACT Textile processing industry generally requires significant amounts of process water for cleaning, rinsing, and dyeing purposes and therefore releases significant amounts of dye polluted waste streams into the environment. In recent years considerable attempts have been made to remove pollutants from these waste streams. One of the promising methods in this regard is membrane filtration. Utilizing this separation method would necessitate the manufacture of effective membranes, such as nanofibrous membranes. Electrospinning is a relatively simple method to produce nanofibers from solutions of different polymers and polymer blends. This paper presents the results of a research on manufacturing a membrane filter by electrospinning Nylon-6 nanofibers on a carbon coated polyurethane substrate and implementing this membrane for dye removal in a filtration system. The membrane sample contained nanofibers with an average diameter of 211 nm. Experiments were run with C.I. Direct yellow 12 as a typical dye pollutant. The effect of coating time, transmembrane pressure, and two different pretreatment methods were investigated and it was observed that by the application of 150ppm coagulant material at 0.75 bar pressure, a filtration efficiency of 98% was achieved.
Environmental Progress & Sustainable Energy
Mesoporous polyvinyl alcohol/chitosan/silica composite nanofiber (PCSCN) as a dye adsorbent was prepared using electrospinning and used for removing Direct Red 80 (DR80). The PCSCN was characterized using SEM, FTIR, and AFM. Dye adsorption was an endothermic reaction and followed the Langmuir isotherm and pseudo-second order kinetics. The effects of operational parameters were investigated. The optimum condition was initial pH 2, adsorbent dosage 5 0.015 g, initial dye concentration 5 15 mg/L, and the optimum adsorption capacity of 322 mg/g. The results showed that PCSCN was a promising adsorbent to remove dye from colored wastewater. V
2015
Electrospinning of nanofibers with cyclodextrin (CD) is attractive because the produced fibers can potentially increase the efficiency of nanofibrous membranes by facilitating the complex formation with organic compounds and high surface area of the nanofibers. In this work, polyacrylonitrile (PAN) nanofibers functionalized with β– cyclodextrin (βCD) during an electrospinning process were used to treat a reactive dye wastewater stream by dynamic method. It was found that the dye removal efficiency was increased from 15.5% for PAN to 24% for PAN/βCD nanofiber mats. The low efficiency of PAN/βCD membranes was due to the decrease in the βCD content during the filteration process because of the high solubility of βCD in aqueous solutions. By crosslinking βCD through a polycondensation process, the PAN nanofibrous membranes containing βCD polymer (βCDP) were prepared and used for filtration. Compared with PAN nanofibers, it was found that the dye removal efficiency improved more than two...