文献类型：期刊文献

英文题名：New nitrogen-rich azo-bridged porphyrin-conjugated microporous networks for high performance of gas capture and storage

作者：Xu, Yanfei[1,4];Li, Zhi[1];Zhang, Fan[2];Zhuang, Xiaodong[2];Zeng, Zheng[3];Wei, Jianjun[3]

机构：[1]E China Univ Sci & Technol, Sch Sci, Inst Nucl Technol Applicat, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Inst Adv Organ Mat, Shanghai 200240, Peoples R China;[3]Univ N Carolina, Joint Sch Nanosci & Nanoengn, Dept Nanosci, Greensboro, NC 27412 USA;[4]Shaoxing Univ, Shaoxing 312099, Zhengjiang Prov, Peoples R China

年份：2016

卷号：6

期号：36

起止页码：30048

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20210909991611);WOS:【SCI-EXPANDED(收录号:WOS:000373061600021)】；

基金：The authors thank the financial support from National Natural Science Foundation of China (51403126). ZZ and JW acknowledge the support from the JSNN at UNCG.

语种：英文

外文关键词：Scanning electron microscopy - Thermogravimetric analysis - Microporosity - Potassium hydroxide - Adsorption - Density functional theory - Porphyrins - Conjugated polymers - High resolution transmission electron microscopy - Nitrogen - X ray diffraction - Fourier transform infrared spectroscopy - Storage (materials) - Pore size

摘要：A series of new conjugated microporous polymers (Azo-1, Azo-2 and Azo-3) based on a nitrogen-rich porphyrin building unit and an azo bond linkage were synthesized by KOH assisted condensation. These materials were characterized by Fourier transform infrared spectroscopy (FT-IR), solid-state C-13 NMR, XPS, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and tested for gas (N-2, CO2 and H-2) adsorption. It was revealed that the azos presented the formation of porous polymer networks affording amorphous particles with rough surfaces and irregular morphology with excellent thermal stability under nitrogen conditions. The Brunauer-Emmett-Teller (BET) model of the N-2 adsorption gave apparent surface area ranges of 520-675 m(2) g(-1). The results from non-local density functional theory (NL-DFT) calculations suggested a pore size distribution between 1.6 and 4.0 nm. The gas (CO2, H-2) adsorption isotherms demonstrated outstanding CO2 uptake up to 17.5 wt% (3.98 mmol g(-1) for Azo-2) and moderate H-2 storage. The isosteric heats of adsorption (Q(st)) are high, with values of 36-37 kJ mol(-1) for the azo polymers. Moreover, the azo-polymer networks exhibited excellent selectivity with CO2/N-2 up to 64.3 for Azo-2 at 273 K/1 bar. It was suggested that the nitrogen-rich active sites of the polymers play an important role for CO2 capture and storage.