Synthesis and characterization of polyamide powders for sorption of reactive dyes from aqueous solutions (original) (raw)
Related papers
Equilibrium sorption of reactive dye on polyamide
Kragujevac Journal of Science
The equilibrium sorption of dyeing polyamide 6.6 fabric with reactive dye is presented in this paper. Polyamide is a chemical fiber obtained from synthetically produced polymers, while reactive dyes are most often sulfonated azo compounds: which are derived from bendisidine and its derivatives. The solution in a constant volume contained dye concentrations of 5, 10, 15, 20, 30, 40 and 50 mg/L. The samples were dyed at temperatures of 40, 60 and 98°C. A spectrophotometer (Cary 100 Conc UV-VIS, Varian) was used to measure the absorbance of aqueous dyed 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: Freundlich and Florry-Huggins. The high functionality of the variable was observed in the Freundlich model.
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.
Biochemical Engineering Journal, 2006
Synthetic diazo dye Acid Blue 29 was removed from aqueous solution using the strongly basic anion exchanger of macroporous structure-Purolite A-520E. The influence of phase contact time (1-180 min), anion exchanger dosage (0.25-1.0 g), solution pH (1-8), initial dye concentration (100-500 mg/L) and temperature (20-50 • C) was studied by the batch method. Additionally, the obtained results were compared with those for the activated carbon Purolite AC-20G. The amounts of Acid Blue 29 adsorbed at equilibrium using the strongly basic anion exchanger were equal to 9.9, 19.9, 29.9 and 48.2 mg/g for the dye solutions of the initial concentrations 100, 200, 300 and 500 mg/L, respectively. The experimental data were analyzed by means of the Langmuir, Freundlich and Temkin models of adsorption. The maximum monolayer capacity Q 0 for sorption of the dye on the activated carbon was 30.2 mg/g. The Q 0 obtained for the strongly basic anion exchanger was ten times higher (321.5 mg/g) than that obtained for Purolite AC-20G. The kinetic data obtained at different concentrations were modelled using the pseudo-first order, pseudo-second order and intraparticle diffusion equations. The experimental data were well described by the pseudo-second order kinetic model.
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.
Monatshefte für Chemie - Chemical Monthly, 2016
Modified cross-linked polyacrylamide (PAA) with pentaazatetraethylene group (N5) was used as a chelating agent for the removal of Congo red (CR) and Calmagite (CG) as industrial dyes from aqueous solutions. The proposed adsorbent, PAA-N5, was prepared by transamidation reaction in aqueous and non-aqueous media by Hofmann reaction. All experimental conditions including adsorbent dosage, contact time, pH value, and initial dye concentration were optimized to get efficient removal of dyes. The removal of CR and CG is pH dependent and the optimum pH values for the maximum removal efficiencies were found to be 7.0. The experimental isotherm data were analyzed using Langmuir, Freundlich, and Temkin isotherm models. The results showed that the adsorption behavior of CR and CG on PAA-N5 was well fitted with the Langmuir model at 25°C and the maximum adsorption capacities were obtained for CR and CG to be 396.07 and 1980.1 mg/g, respectively. The kinetic adsorption rates were modeled using the pseudo-first order, pseudo-second order, and intra-particle models. It was found that the intra-particle and pseudo-second order model were well fitted for CR and CG adsorption with highest correlation coefficients, respectively.
Journal of Applied Polymer Science, 2011
In this study, a procedure for preparation of organic–inorganic composite was established. The procedure was based on gamma irradiation polymerization of polyacrylamide (PAAm) in presence of maleic acid (MA), clay minerals [kaolinite (K)], or [montmorillonite (M)] and methylenebisacrylamide (NMBA) as a crosslinker. The functionality of the produced adsorbents were assayed using FTIR spectroscopy, SEM, and XRD and were evaluated for sorption of neutral red (NR) dye from aqueous solutions via batch sorption experiments. Various factors influencing the sorption behavior (e.g., pH, sorbent dose, and dye concentration) were studied. The sorption data fitted well with Langmuir isotherm model. Batch kinetic experiments showed that the adsorption followed pseudosecond‐order kinetic model with correlation coefficients greater than 0.999. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Journal of Surfactants and Detergents, 2018
Use of polyester-type polyurethane foam (PUF) is an effective adsorbent for the removal of hazardous dye: crystal violet (CV) from an aqueous solution. In this adsorption study, the formation of hydrophobic ion pair (opposite charge attraction) between the charged species, i.e., cationic (basic) dye CV and anionic surfactant sodium dodecylsulfate (SDS) sorbed onto PUF. Chemical calculations were performed using quantum simulation to understand ion-pair formation for CV-SDS at the semiempirical PM6 level. Adsorption studies were performed using 200 mg cylindrical PUF with an overhead stirrer in solutions containing varying compositions of the dyesurfactant mixture. The equilibrium thermodynamics and kinetics of the adsorption process were studies by measuring CV dye removal as a function of time and temperature. Results show that the formation of the dye-surfactant ion pair is necessary for effective adsorption onto PUF. Various adsorption isotherms, viz., Langmuir, Freundlich, Temkin, Dubinin-Radushkevich (DRK), Harkin-Jura, and several kinetic models, viz., pseudo-first order, pseudo-second order, Elovich, and Intraparticle diffusion were used to fit the spectrophotometric result. The equilibrium adsorption data fit to the Langmuir isotherm gives the maximum adsorption of PUF as 33.39 mg g −1 from 200 mL 5.0 × 10 −5 mol L −1 CV solution at 298.15 K. The kinetics study showed that the overall adsorption process follows pseudo-second-order kinetics. The Morris-Weber model suggests that an intraparticle diffusion process is active in controlling the adsorption rate. The Freundlich, Temkin, DRK adsorption isotherms showed that solute dye transfers from solution to the PUF adsorbent surface through physical adsorption. The Langmuir and Harkin-Jura adsorption isotherms suggest that the adsorbent surface is homogeneous in nature. The thermodynamic data showed that the adsorption process is spontaneous and endothermic with a positive enthalpy change and a negative change in Gibb's energy.
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.
Water
In this work, we investigated the effect of various adsorption parameters (solution pH, temperature, contact time, and the presence of phosphate and nitrate ions) on the adsorption of Reactive Red 120 (RR120) dye by Polyamide Nylon 6 (PN6) microplastics (MPs). Maximum uptake was achieved at pH 2.0, and the temperature rise from 295 to 313 K resulted in the decrease of the RR120 sorption by PN6. Equilibrium was achieved after 7 h, and the adsorption kinetic data obeyed the pseudo-second-order kinetic model. The experimental adsorption data were better fitted by the Langmuir isotherm model, and the qm was found to be 3.96 mg/g at pH 2.0 and 295 K. Thermodynamic studies pointed out that the adsorption was spontaneous and exothermic, with decreasing entropy at the solution/solid interface. Future work will focus on the effect of aging on the adsorptive properties of PN6 toward RR120 dye.
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.