Synthesis and Cr adsorption of a super-hydrophilic polydopamine-functionalized electrospun polyacrylonitrile
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ORIGINAL PAPER
Synthesis and Cr adsorption of a super‑hydrophilic polydopamine‑functionalized electrospun polyacrylonitrile Xu Yang1 · Yuhong Zhou1 · Zhaojie Sun1 · Chunhui Yang1 · Dongyan Tang1 Received: 10 May 2020 / Accepted: 21 August 2020 © Springer Nature Switzerland AG 2020
Abstract Electrospun fibers are advanced supporting layers in water purification. Coating the fibers with polydopamine should increase the hydrophilicity and removal efficiency. Here, we report a simple method to fabricate an adsorbent based on polydopamine and electrospun fibers. Polyacrylonitrile and dopamine coelectrospun micro-/nanofibers were selected as supporting layer, and then self-polymerization of polydopamine was used to functionalize the fibers. The polyacrylonitrile/polydopamine micro-/nanofibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and contact angle. Hexavalent chromium Cr(VI) was then used to investigate the adsorption by fabricated fibers. Results show that the fibers display a super-hydrophilicity and relative excellent adsorption capacity qm of 61.65 mg g−1 of Cr(VI). This finding is explained by the occurrence of amino and hydroxyl groups of polydopamine, and by the porous fibrous morphology of the electrospinning. Keywords Electrospinning · Polydopamine coatings · Elecrospun fibers · Adsorption · Cr(VI) removal
Introduction The removal of contaminants and the fabrication of novel and valuable adsorbents are both of great significance to ensure the safety of drinking water (He et al. 2020). The strategy of membrane adsorption, with characteristics of relatively easy operation and higher separation efficiency, has attracted more attention in the field of water purification (Dharupaneedi et al. 2019; Chen et al. 2019). Thereinto, polymer-based adsorptive membranes, owing to high mechanical properties, good stability (especially the stability that within aqueous media) and excellent corrosion resistance, are more suitable for removing contaminants from aqueous media (Bao et al. 2019; Foster et al. 2020). Electrospinning technique, a typical and efficient method for assembling nanofibrous polymer membranes, has been Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10311-020-01086-7) contains supplementary material, which is available to authorized users. * Dongyan Tang [email protected] 1
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
used to fabricate novel and effective adsorbents. The wildly used polymers included polyacrylonitrile, poly(vinylidene fluoride) and polyurethane (Mohamed et al. 2019; Liao et al. 2018; Mishra et al. 2019), and fabricated membranes would usually exhibit porous structures with adjustable porosity and other peculiar characters, such as higher water stability, good chemical durability and mechanical properties (Suja et al. 2017; Ge et al. 2018). Hence, the electrospun polymer fibers could be potentially used as the supporting laye
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