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.
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.
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.
The investigated means of dispersed degree of PAn on the surface of KF and KF-H are the further and future investigation.
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.
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.
The authors greatly thank the financial support of this work by the National Natural Sciences Foundation of China (NSFC No. 21605150, 21544013 and 51673089).
This study was supported by the National Natural Sciences Foundation of China (NSFC No. 21605150, 21544013 and 51673089).
Liu, Y., Wu, F., Tian, X., Hu, X., Liu, Y., Zhao, X., Qu, R., Ji, C. and Niu, Y. (2021), "Polyaniline dispersed by Kevlar fiber for uptake of organic dye", Pigment & Resin Technology, Vol. 50 No. 4, pp. 346-355. https://doi.org/10.1108/PRT-07-2020-0077
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