期刊
NANO RESEARCH
卷 3, 期 9, 页码 632-642出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-010-0023-7
关键词
Mesoporous materials; carbon nitride; nanocasting; sphere; hard template; CO2 capture
类别
资金
- National Natural Science Foundation of China (NSFC) [2089012, 20721063, 20821140537, 20871030]
- State Key Basic Research Program of PRC [2006CB932302, 2009AA033701]
- Shanghai Leading Academic Discipline Project [B108]
- Science & Technology Commission of Shanghai Municipality [08DZ2270500]
- National Research Foundation (NRF) through the Korea-China Joint Research Center [K20803001459-10B1200-00310]
- Acceleration Research Program [2010-0000790]
- National Research Foundation of Korea [2009-0078791, 2008-00444] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Porous carbon nitride (CN) spheres with partially crystalline frameworks have been successfully synthesized via a nanocasting approach by using spherical mesoporous cellular silica foams (MCFs) as a hard template, and ethylenediamine and carbon tetrachloride as precursors. The resulting spherical CN materials have uniform diameters of ca. 4 mu m, hierarchical three-dimensional (3-D) mesostructures with small and large mesopores with pore diameters centered at ca. 4.0 and 43 nm, respectively, a relatively high BET surface area of similar to 550 m(2)/g, and a pore volume of 0.90 cm(3)/g. High-resolution transmission electron microscope (HRTEM) images, wide-angle X-ray diffraction (XRD) patterns, and Raman spectra demonstrate that the porous CN material has a partly graphitized structure. In addition, elemental analyses, X-ray photoelectron spectra (XPS), Fourier transform infrared spectra (FT-IR), and CO2 temperature-programmed desorption (CO2-TPD) show that the material has a high nitrogen content (17.8 wt%) with nitrogen-containing groups and abundant basic sites. The hierarchical porous CN spheres have excellent CO2 capture properties with a capacity of 2.90 mmol/g at 25 A degrees C and 0.97 mmol/g at 75 A degrees C, superior to those of the pure carbon materials with analogous mesostructures. This can be mainly attributed to the abundant nitrogen-containing basic groups, hierarchical mesostructure, relatively high BET surface area and stable framework. Furthermore, the presence of a large number of micropores and small mesopores also enhance the CO2 capture performance, owing to the capillary condensation effect.
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