Fabrication, characterization, and dye adsorption capability of recycled modified polyamide nanofibers

Abstract

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.

low-cost Bio-Adsorbent based on Amorphous Carbon Thin Film/chitosan composite for removal of Methylene Blue Dye: Kinetic and Isotherm

“…Methylene blue also has a toxic and carcinogenesis effect on human health and living organisms [10]. To a certain extent, MB enters our bodies through food, drinking water, air and can lead to poisoning at higher concentrations.…”

“…Kinetic studies were carried out by pulling and analyzing samples over a time interval every 5 minutes during the first 60 minutes, and then every 10 minutes until successive concentrations of the remaining dyes reach. Kinetic data for the adsorption of MB into a composite with four initial dye concentrations (10,25,50, and 100 mg/L) were tested with well-known kinetic models, namely pseudo-first order model and pseudo-second regular model. The mechanism of the adsorption process was studied by placing data with models.…”

Preparation and evaluation of polyamides for printing ink

“…The aliphatic polyamides are produced on a much larger scale than the fully aromatic polyamides and are the most important class of engineering thermoplastics [6]. The polymer fibers, nylon (nylon 6 and nylon 6.6) fibers are widely used in carpet factories [7][8].…”

Adsorption of the anionic dye (Diamond Fast Brown KE) from textile wastewater onto chitosan/montmorillonite nanocomposites

“…Dyeing wastewater has grabbed considerable public attention because of its carcinogenicity, easy accumulation in living organisms, high toxicity, and resistance to degradation [1][2][3][4]. Due to the complexity of wastewaters, and in particular the presence of the problematic azo-reactive dyes, colour removal is a major concern for the textile industries.…”