Abstract
Prussian blue and its analogues (PBA) based nanomaterials have been widely applied to removing pollutants in the recent years. However, easy aggregation and poor recycling largely limit their practical applications. In this work, spiderweb-like Fe-Co Prussian blue analogue/polyacrylonitrile (FCPBA/PAN) nanofibers were prepared by electrospinning and applied to degrading bisphenol-A (BPA) by activating peroxymonosulfate (PMS). Detailed characterization demonstrated that a high loading of FCPBA (86% of FCPBA in FCPBA/PAN) was successfully fixed on the PAN nanofibers. 67% of BPA was removed within 240 min when 500 mg·L−1 PMS and 233 mg·L−1 FCPBA/PAN were introduced in 20 mg·L−1 BPA solution at initial pH of 2.8. Electron paramagnetic resonance (EPR) and radical inhibition experiments were performed to identify the possible degradation mechanism. For comparison, a low loading of FCPBA nanofibers (0.6FCPBA/PAN nanofibers, 43% of FCPBA in FCPBA/PAN) were also prepared and tested the catalytic performance. The results showed that the activity of FCPBA/PAN was much higher than 0.6FCPBA/PAN. Furthermore, a FCPBA/PAN packed column was made as a reactor to demonstrate the reusability and stability of FCPBA/PAN nanofibers, which also exhibited the bright future for the industrial application. This work makes it possible to fabricate efficient PBA nanocatalysts with excellent recyclability and promotes the application of PBA in industrial areas.
Highlights
Environmental pollution has received more and more attention nowadays due to the fast growth of economy and industry [1,2,3]
Scheme 1 shows the fabrication of FCPBA/PAN nanofiber
The beforehand synthesized FCPBA was well dispersed in DMF solution with vigorous sonication
Summary
Environmental pollution has received more and more attention nowadays due to the fast growth of economy and industry [1,2,3]. Various transition metal ions and transition metal oxides were exploited for PMS activation [19,20,21,22] These catalysts usually face the problem of high cobalt leaching and bring secondary pollution. Lin’s group synthesized a series of Prussian blue analogues, and used them to activate peroxymonosulfate (PMS), which shows very high catalytic activity [26]. Kim et al prepared Prussian blue/PAN (PB/PAN) nanofibers and used it to remove cesium [38] In these studies, the loading amount of nanoparticles was relatively low (usually under 50%). To illustrate the synergistic effect of Co and Fe, single metal (Fe-Fe and Co-Co) Prussian blue analogues were synthesized and fabricated into nanofibers by electrospinning method. A FCPBA/PAN packed column was made as a reactor to demonstrate the reusability and stability of FCPBA/PAN nanofibers
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