Use of the [Copper(II)/MAA-nylon] Complex for the Adsorption of Residual Acid Dyes

Abstract

Nylon fibres were converted into a strong ion-exchange polymer by grafting with methacrylic acid (MAA). The modified nylon fibres were monitored for their ability to remove copper(II) ions and dyes from aqueous solutions. Evidence for the grafting of MAA onto nylon was provided by weight uptake experiments and atomic force microscopy (AFM). The exchange capacity of MAA-nylon was evaluated by potentiometric titration of the grafted acidic groups. Due to complexation, the acidic grafted groups immobilize Cu(II) ions from Clark-Lub's buffered solution at a pH value of 8. The formation of a 1:1 complex was demonstrated by the values of the adsorption limits.The binary [Cu(II)/MAA-nylon] system was then tested for the adsorption of two Acid dyes, i.e. Acid Blue 25 (AB 25) and Calmagite (Calma), as ligands in the metal-coordinating process. The adsorption of Cu(II) onto MAA-nylon and of the dyes onto Cu(II)/MAA-nylon was followed spectrometrically. ) for adsorption were also investigated. The adsorption process is exothermic, which leads to a reduction in the extent of dye adsorption with increasing temperature.

The effect of hot water setting treatment on the dyeing properties of grafted polyamide 6.6 microfibres

“…As expected, the Q values increased in the case of hot water set samples compared with the unset ones, indicating that a higher amount of cationic dye has been adsorbed by the modified surface of hot water set samples. According to the literature, the closer the value of b to zero, the more heterogeneous the fibre surface (Makhlouf, Baouab, & Roudesli, 2008). In this work, the b values prove that the unset and hot water set grafted polyamide 6.6 microfibres have a maximum affinity for cationic dye at the higher percentage of grafting (%G = 12).…”

Influence of grafting with acrylic acid on the dyeing properties of polyamide 6.6 fibres

“…According to the literature, the higher the values of b that are close to zero the more heterogeneous the fibre surface [16]. In this work, the b values indicate that the modified polyamide 6.6 has a maximum affinity for the cationic dye at a higher percentage of grafting (%G = 12).…”

Modified polyamide 66 fibers for the removal of reactive dyes from aqueous suspension

“…In other example, chitosan is blended with nylon 6 by combining solvent evaporation and a phase inversion technique, where silver ions are chelated to the membranes, and then antibacterial properties were investigated [16]. In other works, nylon fibers were grafted with methacrylic acid (MAA) and the modified samples were used to remove copper (II) ions and dyes from aqueous solutions [17]. Tseng has also reported the grafting of chitosan oligomer or polymer on nylon fabrics after being activated by open air plasma and then checked for antimicrobial experiments [18].…”