Abstract
Silk fibroin/polypropylene (SF/PP) nonwoven fabrics were prepared via electrospinning method. The composite materials combine the advantage of nanofibers with the high specific surface area and the strong affinity toward fluoride. SF/PP nonwoven fabrics were characterized, and the adsorption of fluoride was investigated. The results showed the diameter of SF nanofibers increased from 950±37 nm to 2400±50 nm in nonwoven fabrics with the increase of SF concentration from 5.0 wt% to 10 wt%. Before fluoride adsorption, no crystal particles were deposited on the surface of SF/PP nanofibers. After adsorption 5 min, only several white crystals were deposited. Within the increase of adsorption times from 10 min to 60 min, many larger crystals were grown. Fluoride ions were confirmed in crystals by EDS. From adsorption rate curve, the rate of fluoride removal was rapid initially and slowed down gradually until it attained equilibrium. At the same time, a large fraction of fluoride ions was removed within 20 min of contact times in all the experimental various studied. Therefore, this nonwoven fabric has a great potential as a novel adsorbent material for the fluoride removal from drinking water.
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Acknowledgements
This work was financially supported by Qingdao Innovation Project (17-1-1-68-jch), China Postdoctoral Science Foundation (2016M592141), Shandong Postdoctoral Innovation Project (201603067), National Natural Science Foundation of Shandong Province (BS2015CL017), the Cooperation Project of Zhongyuan University of Technology (2016PYG15), and Industrial Research Institute of Nonwovens & Technical Textiles, Qingdao University.
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Fan, Z., Gao, Y., Ning, X. et al. Adsorption of Fluoride Ions from Water by SF/PP Nonwoven Fabrics. Fibers Polym 20, 863–867 (2019). https://doi.org/10.1007/s12221-019-1085-0
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DOI: https://doi.org/10.1007/s12221-019-1085-0