A Zn-salen based covalent triazine framework as a promising candidate for CO_2 capture

摘要

A Zn-salen based covalent triazine framework (Zn@CTF) was prepared through ZnCl2 promoted one-pot procedure under ionothermal conditions using salen type precursor N,N'-Bis(5-cyano-salicylidene)-1,2-benzendiamine derived from imine condensation reaction of 3-formyl-4-hydroxybenzonitrile and 1,2-diaminebenzene. The chemical structure of the obtained polymer was characterized by solid-state C-13 nuclear magnetic resonance (NMR), fourier transform infrared (FT-IR), energy dispersive spectrometer (EDS) and element analysis. Powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA) showed that the prepared polymer possessed amorphous structure and good thermal stability. The porous property of the polymer material was also characterized by N-2 adsorption/desorption isotherm and the Zn@CTF material exhibited excellent porosity with a Brunauer-Emmett-Teller (BET) surface area of up to 598.2 m(2) g(-1). The surface microstructure property was evaculated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The CO2 adsorption performance of the Zn@CTF was further investigated and it was found that the CO2 uptake capacity was 43.9 cm(3) g(-1) at 273 K. (C) 2018 Elsevier B.V. All rights reserved.