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Facile synthesis of porous carbon nitride spheres with hierarchical three-dimensional mesostructures for CO$_{2}$ capture

Content Provider	Springer Nature Link
Author	Li, Qiang Yang, Jianping Feng, Dan Wu, Zhangxiong Wu, Qingling Park, Sung Soo Ha, Chang Sik Zhao, Dongyuan
Copyright Year	2010
Abstract	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 μm, 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 ∼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 CO$_{2}$ temperature-programmed desorption (CO$_{2}$-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 CO$_{2}$ capture properties with a capacity of 2.90 mmol/g at 25 °C and 0.97 mmol/g at 75 °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 CO$_{2}$ capture performance, owing to the capillary condensation effect.
Starting Page	632
Ending Page	642
Page Count	11
File Format	PDF
ISSN	19980124
Journal	Nano Research
Volume Number	3
Issue Number	9
e-ISSN	19980000
Language	English
Publisher	Tsinghua Press
Publisher Date	2010-09-09
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mesoporous materials carbon nitride nanocasting sphere hard template CO$_{2}$ capture Biomedicine general Biotechnology Condensed Matter Physics Atomic/Molecular Structure and Spectra Materials Science Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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