Polyaniline dispersed by Kevlar fiber for uptake of organic dye

Abstract

Purpose This paper aims to focus on the preparation of Kevlar fiber (KF) and alkaline hydrolyzed KF (KF-H) to improve the dispersed condition of polyaniline (PAn), as the aggregation of PAn would lead to some adsorption sites buried. And then the materials were used to enrich anionic dye Congo red (CR) from aqueous solution. Design/methodology/approach The materials (KF@PAn and KF-H@PAn) were designed by means of “diffusion-interfacial-polymerization” under mild condition as high affinity due to the structural properties of PAn, KF and KF-H. The dispersed degree of PAn on the surface of KF and KF-H was validated according to adsorption efficiency for CR. Findings The content of PAn introduced was not beyond 20 wt.%, while adsorption capacity for CR was significantly enhanced by 4–8 times (on the basis of kinetic data) according to the calculation only by the content of PAn due to KF and alkaline hydrolyzed KF exhibited almost no adsorption for CR, indicating dispersed situation of PAn coating was greatly enhanced and more active sites exposed, which was favorable for the adsorption process. Presence of NaCl would exhibit a more or less positive effect on CR uptake, suggesting the materials could be used for high salt environment. Research limitations/implications The investigated means of dispersed degree of PAn on the surface of KF and KF-H are the further and future investigation. Practical implications This study will provide a method to improve the dispersed situation of PAn and a theoretical support to treat anionic dyes from aqueous solution especially for salt environment. Originality/value The results showed that the dispersed condition of PAn on the surface of KF and KF-H was greatly improved. According to the adsorption capacities for CR, it can be concluded that part of adsorption sites were buried due to the aggregation of PAn, and introduction of KF and KF-H, buried adsorption sites decreased greatly. This study will provide a method to decrease buried adsorption sites of PAn and a contribution for their convenient application in wastewater treatment especially for high salt environment.

Recent Advances in the Removal of Organic Dyes from Aqueous Media with Conducting Polymers, Polyaniline and Polypyrrole, and Their Composites

“…The organic substrates coated with conducting polymers include synthetic polymers, such as carboxymethylcellulose gel [ 78 ], Kevlar fibers [ 73 ], macroporous melamine sponges [ 16 ], poly(ethylene oxide) [ 76 ], polyimide membrane [ 74 ], polystyrene [ 64 ], poly(vinyl alcohol) aerogel [ 42 ], polyurethane foam [ 77 ], and various natural materials, such as [ 24 , 75 ], chitosan [ 82 ], opuntia ficus [ 80 ], almond and wall nut shells [ 81 ] or tea saponin [ 41 ]. Only exceptionally, both components were simply mixed, e.g., polyaniline and nitrogen-containing carbon nanodots [ 87 ] or zinc oxide [ 61 ].…”

Synthesis of metal organic framework modified with carboxylated attapulgite and adsorption properties for organic dye

“…Consequently, the effluent containing organic dyes must be treated before discharge. Various methods such as adsorption (Liu et al , 2020c; Liu et al , 2020d; Omer et al , 2021), biological treatment (Q. Song et al , 2021a), membrane filtration (Song et al , 2021b), photo-catalytic degradation (Shahzad et al , 2021) have been used to eliminate organic dyes from wastewater.…”

Preparation of metal organic framework hybridizing with poly(p-phenylene terephthalamide) fiber and adsorption properties for anionic dye

“…Poly(p-phenylene terephthalamide) (PPTA), with brand name of Kevlar, is a type of aromatic polyamide (aramid) material with a rigid rod structure. It exhibited prominent properties such as high tensile strength, high elastic modulus, high thermal resistance and stiffness (Lin et al , 2017; Liu et al , 2021a; Yilmaz and van Duin, 2018). The mechanical properties of composite materials with PPTA could be significantly enhanced owing to excellent properties of PPTA.…”