Hierarchical Nanocomposite by Integrating Reduced Graphene Oxide and Amorphous Carbon with Ultrafine MgO Nanocrystallites for Enhanced CO 2 Capture

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1 Supporting Information Hierarchical Nanocomposite by Integrating Reduced Graphene Oxide and Amorphous Carbon with Ultrafine MgO Nanocrystallites for Enhanced CO 2 Capture Ping Li, and Hua Chun Zeng* Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore * chezhc@nus.edu.sg Number of Pages: 17 Number of Tables: 1 Number of Figures: 14 S-1

2 Figure S1. FTIR spectrum of the graphene oxide used in this work. The sample was prepared by a modified Hummer's method (see Experimental Section). S-2

3 Figure S2. SEM and TEM images of precursors: (a, b) EG-2, (c, d) and (e, f) S-3

4 Figure S3. (a) SEM and (b) TEM images of flower-like Mg-EG complex precursor. S-4

5 Figure S4. FTIR spectra of (a) (b) (c) EG-15, and (d) Mg-EG precursors. S-5

6 Figure S5. TGA curves of (a) (b) (c) EG-15, and (d) Mg-EG precursors. S-6

7 Figure S6. FTIR spectrum of the as-obtained nanocomposite. Note that when sample is exposed to the atmosphere, H2O and CO2 molecules are easily adsorbed onto the MgO surface. Thus the bands assigned to the carbonate species and adsorbed H2O are unavoidable to appear in the FTIR spectrum. S-7

8 Figure S7. SEM and TEM images of nanocomposites: (a-c) (d-f) and (g-i) S-8

9 Figure S8. (a) SEM and (b, c) TEM images of flower-like MgO/C nanocomposite. S-9

10 Figure S9. N2 adsorption desorption isotherms and the corresponding NLDFT pore size distribution curves of nanocomposites: (a, b) (c, d) (e, f) and (g, h) S-10

11 Figure S10. (a) N2 adsorption desorption isotherm and (b) the NLDFT pore size distribution curve of the flower-like MgO/C nanocomposite. Figure S11. (a, b) SEM images of the commercial MgO sample. S-11

12 Figure S12. The normalized CO2 sorption capacities (based on MgO) of the sorbents at 27 C and 1 bar of CO2. S-12

13 Figure S13. TEM images of the alkali metal salt promoted nanocomposites: (a) KNO3-promoted, (b) K2CO3-promoted, and (c) NaNO3-promoted. S-13

14 Figure S14. TEM image of the spent nanocomposite. S-14

15 Table S1. A summary of CO2 capture capacities on different MgO-based sorbents from the literature. Sorbent Sorption temperature ( C) Regeneration temperature ( C) CO 2 partial pressure (bar) CO 2 sorption capacity (wt%) Ref. rgo@mgo/c This work MgO/activated carbon ca Mesoporous carbon supported MgO Carbon doped porous MgO- ZnO Carbon doped porous MgO Porous pure MgO Ordered mesoporous MgO/carbon spheres MgO/C Foam-like MgO ca Mesoporous MgO Mesoporous MgO-Al 2O Mesoporous MgO-TiO Mesoporous MgO Porous MgO Mesoporous MgO-Al 2O MgO-NP Multi-core MgO NPs@C Nanoporous MgO/C Mesoporous Mg Zr solid oxides Pure MgO MgO-Al 2O S-15

16 References: (1) Li, Y. Y.; Han, K. K.; Lin, W. G.; Wan, M. M.; Wang, Y.; Zhu, J. H. J. Mater. Chem. A 2013, 1, (2) Bhagiyalakshmi, M.; Hemalatha, P.; Ganesh, M.; Mei, P. M.; Jang, H. T. Fuel 2011, 90, (3) Li, Y. Y.; Wan, M. M.; Sun, X. D.; Zhou, J.; Wang, Y.; Zhu, J. H. J. Mater. Chem. A 2015, 3, (4) Chen, A.; Yu, Y.; Li, Y.; Li, Y.; Jia, M. Mater. Lett. (5) Li, P.; Liu, W.; Dennis, J. S.; Zeng, H. C. ACS Applied Materials & Interfaces 2017, 9, (6) Han, K. K.; Zhou, Y.; Lin, W. G.; Zhu, J. H. Microporous Mesoporous Mater. 2013, 169, 112. (7) Bhagiyalakshmi, M.; Lee, J. Y.; Jang, H. T. Int. J. Greenhouse Gas Control 2010, 4, 51. (8) Han, S. J.; Bang, Y.; Lee, H.; Lee, K.; Song, I. K.; Seo, J. G. Chem. Eng. J. 2015, 270, 411. (9) Jeon, H.; Min, Y. J.; Ahn, S. H.; Hong, S.-M.; Shin, J.-S.; Kim, J. H.; Lee, K. B. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2012, 414, 75. (10) Ding, Y.-D.; Song, G.; Zhu, X.; Chen, R.; Liao, Q. RSC Adv. 2015, 5, (11) Jiao, X.; Li, H.; Li, L.; Xiao, F.; Zhao, N.; Wei, W. RSC Adv. 2014, 4, (12) Ruminski, A. M.; Jeon, K.-J.; Urban, J. J. J. Mater. Chem. 2011, 21, (13) Kim, T. K.; Lee, K. J.; Yuh, J.; Kwak, S. K.; Moon, H. R. New J. Chem. 2014, 38, S-16

17 1606. (14) Kim, T. K.; Lee, K. J.; Cheon, J. Y.; Lee, J. H.; Joo, S. H.; Moon, H. R. J. Am. Chem. Soc. 2013, 135, (15) Jiao, X.; Li, L.; Zhao, N.; Xiao, F.; Wei, W. Energy & Fuels 2013, 27, (16) Li, L.; Wen, X.; Fu, X.; Wang, F.; Zhao, N.; Xiao, F.; Wei, W.; Sun, Y. Energy & Fuels 2010, 24, S-17

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