Facile Synthesis of Porous Carbon Nitride Spheres with Hierarchical Three-Dimensional Mesostructures for CO_(2) Capture  

作　　者：Qiang Li Jianping Yang Dan Feng Zhangxiong Wu Qingling Wu Sung Soo Park Chang-Sik Ha Dongyuan Zhao 

机构地区：[1]Department of Chemistry and Shanghai Key Laboratory of MolecularCatalysis and Innovative Materials,Laboratory of Advanced Materials,Fudan University,Shanghai 200433,China [2]Department of Polymer Science and Engineering,Pusan National University,Geumjeong-gu,Busan 609-735,Korea

出　　处：《Nano Research》2010年第9期632-642,共11页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(NSFC)(Nos.2089012,20721063,20821140537,20871030);State Key Basic Research Program of PRC(Nos.2006CB932302 and 2009AA033701);Shanghai Leading Academic Discipline Project(No.B108);Science&Technology Com-mission of Shanghai Municipality(No.08DZ2270500);C.S.Ha also thanks the National Research Foundation(NRF)of Korea for support through the Korea-China Joint Research Center Program on Mesoporous Thin Films(No.K20803001459-10B1200-00310);the Acceleration Research Program(No.2010-0000790).

摘　　要：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.4μm,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℃and 0.97 mmol/g at 75℃,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.

关 键 词：Mesoporous materials carbon nitride NANOCASTING sphere hard template CO_(2)capture 

分 类 号：TB3[一般工业技术—材料科学与工程]