Sorption Process Using Polyamide Nanofibres to Remove Dye from Simulated Wastewater (original) (raw)
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Autex Research Journal, 2013
The ability of polyamide 6 nanofibers membrane (P6NM) to remove acid dyes from effluent solution by adsorption has been studied. Equilibrium isotherms for the adsorption of three acid dyes, Acid blue 41 (AB41), Acid blue 78 (AB78), and Acid yellow 42 (AY42), on P6NM were measured experimentally. Simulated wastewater of acid dyes with the concentration of 10 mg/L for sorption process electrospun polyamide 6 with mass per unit area 12 g/m2 was used as the sorbent material. Ten sets of P6NM were dipped in separate simulated effluent. The weight of the original P6NM and the concentration of left solution were detected. Results were analyzed by the Langmuir equation using a linearized correlation coefficient. And it showed that all the dyes tested could follow the Langmuir adsorption isotherm, which gave excellent correlation for all the dyes.
Application of Modified Polyamide Fibres to Remove Dyes from Dyehous Wastewater
In order to increase the sorption power of collected fibres, they were powdered by a plain milling machinery to prepare very fine particles with the size of 1 to 5 micron. They provided a very large surface area which speed on the sorption rate. The effects of size of absorbent on depolarization rates of various types of acid dyes as well as the concentration of dyes and the temperature of wastewater were studied by simulation of effluent conditions. The measurement of chemical oxygen demand (COD) and the absorption spectrophotometer technique were used to evaluate the performance of the system. More than 90% of acid dyes were elevated from wastewater with 1g/lit of powdered polyamide.
Egyptian Journal of Chemistry, 2018
U TILIZATION of electrospinning technique accompanied by chemical modification as well as, the production of low-cost adsorbent based on polyamide nanofibers is the aim of our current work. The electrospinning parameters (polymer conc, applied voltage, and collector distance) have been studied. The obtained polyamide nanofiber mats were modified with citric acid at various conditions (concentration, temperature and catalyst concentration). The optimum conditions of this modification were investigated by MB uptake efficiency. The obtained data illustrate a positive relationship between citric acid concentration and MB uptake using the modified polyamide nanofiber. The produced adsorbent was well characterized using SEM, ATR-FTIR, and surface area measurement. Scanning Electron Microscopy clarifies minor swelling of nanofibers during the modification process which attributed to the increase in fiber diameter and therefore reduction in the fiber surface area. The adsorption performance of the nanofiber mat was assessed as a function of pH, nanofiber mat dosage, contact time, and initial dye concentration. Kinetics and isotherms analysis were investigated as well. The MB separation capability of the modified PA-nanofiber was considerably higher than that of the PAnanofiber. The kinetic data of both nanofiber mat was better fitted with the pseudo-second-order model. Also, the equilibrium data of PA-nanofiber was better fitted with Freundlich model and Langmuir model in case of the modified PA-nanofiber. The adsorption behavior was favorable chemisorption process as inferred from the kinetics, and the isotherms studies. The results of this study promote the modified PA-nanofiber as a potential adsorption filters for dyeing wastewater decolourization.
Fabrication of Electrospun Polyamide-6/Chitosan Nanofibrous Membrane toward Anionic Dyes Removal
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.
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.
The main objective of this work is the preparation of nanofibrous mats (NFM) from polyamide 6 (PA6) reinforced and functionalized by renewable proteinic waste and examining their potential use for the sorption of heavy metal ions and dyes from wastewater from textile plants. Two renewable waste biopolymers; namely keratin (from waste of wool combing) and sericin (from degumming of natural silk) were extracted and regenerated. NFMs were prepared by electro-spinning of PA6/biopolymer composites in formic acid using nozzle-less electro-spinneret. The potential of the prepared mats for sorption of Cr +6 , Cr +3 , Cu +2 , and Pb +2 cations as well as anionic and cationic dyes from wastewater were assessed. The prepared composites were characterized by measuring their viscosity, nanofiber diameter, porosity, thickness, and air permeability. The morphological structure of the electro-spun NFM was investigated by scanning electron microscopy (SEM). Chemical and physical properties of the obtained mat were studied using Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and X-ray diffraction pattern (XRD). In the NFMs from PA 6 only, PA 6/keratin, PA 6/sericin, and PA 6/keratin and sericin, the sorption capacity of the prepared NFMs towards the examined cations varies according to the NFM composition and the nature of the adsorbed cation. In all cases, the maximum dye sorption was attained after 96 hours for basic dye and 72 hours for acid dye.
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).
PAN-based nanofibers were prepared using a cheap and straightforward electrospinning method. The produced fibers were in the range of 100nm or less. Polymers were dissolved in DMF and DMAC to make the solutions. Parameters such as voltage, solvent, a distance between the tip of the capillary tube and collector plate which affect the diameter and morphology of the fibers were investigated. Fibers were then stabilized in the temperature range of 200 °C-300 °C in an oxygen containing atmosphere to make the fibers thermally stable. Methyl orange was used to study the absorption capacity of electrospun PAN fibers under UV-Vis spectroscopy. Properties of electrospun fibers make them suitable to be used as adsorbents in adsorption process when removing dyes from wastewater. The produced fibers were characterized by SEM, FT-IR, and UV-Vis.
Dyeing of Recycled Electrospun Polyamide 6 Nanofibers: Implications of Dye Particle Size
Fibers and Polymers
The dyeing of recycled polyamide nonwoven fabrics based on nanofibers (PA-NWNF), which were fabricated from polyamide wastes, was conducted in this study. Since PA-NWNF exhibited a high surface area to volume ratio, it was dyed with different particle sizes of Disperse Red 167 dye (DR 167, DR 167-B, and DR 167-C) without auxiliary agents to prevent further environmental pollution. The undyed and dyed PA-NWNF, as well as the applied dyes, were characterized by SEM, BET, XRD, and FT-IR techniques. Both color yield (K/S) and fastness of dyed PA-NWNF were also evaluated. The morphology of dyed DR 167-C owned homogeneity and smooth nanofibers. In addition, DR 167-C dye (the smallest particle size) provided numerous advantages, including high particle dispersion, low dyeing temperature, minimum processing time, and greater color yield. At a concentration of 15%, DR 167-C produced 55.1 and 33.18% color yields which were higher than DR 167 and DR 167-B, respectively. Also, DR 167-C achieved...
Equilibrium sorption of direct dye on polyamide
Zenodo (CERN European Organization for Nuclear Research), 2022
In this paper, the equilibrium sorption of dyeing polyamide 6.6 fabric with direct dye is presented. Polyamide is a chemical fiber obtained from synthetically produced polymers, while direct dyes are most often sulfonated azo compounds: which are derived from bendisidine and its derivatives. Samples of 100% raw polyamide 6.6 fabric were used in the experiment. The direct used dye is called Solophenyl blue 4GL. The samples were dyed at different dye concentrations: 5, 10, 20, 30, 40, 50 mg/l. The temperature at which the samples were dyed was 40, 60 and 98 °C. Citric acid was added to the dye solution to achieve a certain pH of the solution. A spectrophotometer (Cary 100 Conc UV-VIS, Varian) was used to measure the absorbance of aqueous stained solutions and to calculate the unknown dye concentration in the solution and to construct a calibration curve. The degree of dye exhaustion and the amount of absorbed dye were calculated. Two models of adsorption isotherms were used: Langmuir and Harkin-Jura. The high functionality of the variable was observed in the Langmuir model.