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www.nature.com/scientificreports/ Figure 5. (a) HAADF image and (b–f) showing elemental mapping of Fe, Si, N, Cu and Fe/Si/Cu of Cu-ABF@ ASMNPs sample. Figure 6. XPS Cu2p spectra of Cu-ABF@ASMNPs catalyst (a) fresh and (b) reused. Reusability of the catalyst. Cu-ABF@ASMNPs nanocatalyst also be easily separated from the reaction mixture. To investigate the recyclability of the catalyst, styrene oxide was chosen as the substrate. After comple- tion of the reaction, catalyst was separated from the reaction mixture using the external magnet, washed with ethyl acetate and ethanol and dried under vacuum. As shown in Fig. 11, catalyst could be recovered and reused at least five times, without any obvious decrease in catalytic activity. Moreover, the TEM images of the fresh and recycled catalyst (after the fifth run) were very similar (see Supplementary Fig. S3). This means that the morphology of the catalyst remains unaltered after the reaction. Additionally, CHN analyses of fresh and recovered Cu-ABF@ASMNPs nanocatalyst were conducted and results are shown in Supplementary Table S2. The result of CHN analysis of recovered catalyst showed no significant change in C, H and N contents. These results indicate that heterogeneous Cu-ABF@ASMNPs catalyst has excel- lent recyclability for cycloaddition reaction. Hot filtration test. To test the heterogeneous nature of catalyst, a hot filtration test was carried out for cycloaddition reaction of styrene oxide under applied reaction condition. After completion of the reaction, cata- lyst was separated from the reaction mixture through external magnet and then filtrate was analysed by ICP-OES. SCientifiC RepoRts | (2018) 8:1901 | DOI:10.1038/s41598-018-19551-3 6PDF Image | copper-based magnetic nanocatalyst for the fixation of carbon dioxide
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