Abstract
We report on the in situ synthesis and stabilization of manganese dioxide (MnO2) onto four different silk yarns (mulberry, tasar, muga and eri silks). A new ultrasound-assisted procedure was used to reduce permanganate (MnO4 −) and yielded MnO2 nanoparticles (NPs) on/in the different silk fibers. Using a factorial design we assessed the influence of the silk type, manganese precursor concentration, sonication time, and temperature. The results indicated no measurable effect of the process parameters on the silk structures, but significant correlation with the rate of degradation of methylene blue (MB) and the fraction of permanganate consumed. Further optimization of the factorial model identified the optimal process conditions for each silks: mulberry (150 min sonication, 20 mM permanganate), eri (360 min, 10 mM), tasar (150 min, 10 mM) and Muga (20 min, 10 mM). The operational stability (successive catalysis) of the optimum hybrids showed good performance over 5 cycles and most importantly reduced direct dye absorption relatively to dye oxidation. Overall, we found that all silks could template the formation and stabilization of different MnO2 polymorphs and yielded catalytic instead of stoichiometric hybrid fibers.
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Singh, M., Musy, C., Dey, E.S. et al. Rapid fabrication and optimization of silk fibers supported and stabilized MnO2 catalysts. Fibers Polym 18, 1660–1670 (2017). https://doi.org/10.1007/s12221-017-7160-5
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DOI: https://doi.org/10.1007/s12221-017-7160-5