A thiophene-containing covalent triazine-based framework with ultramicropore for co2 capture

• 来源期刊: 能源化学
• 年，卷（期）: 2017,（5）
• 页码范围: 902-908
• 页数: 7页
• 语种: 英文

摘要

In this work,a 2D covalent triazine-based framework was prepared by using 1,3-dicyanobenzo[c]thiophene (DCBT) as monomer to effectively capture CO2.The resulting CTF-DCBT was characterized by FVIR,XPS,PXRD,elemental analysis,SEM,TEM,and N2 adsorption-desorption.The results indicate that CTF-DCBT is partially crystalline and has ultramicropore (6.5 A) as well as high heteroatom contents (11.24wt％ and 12.61wt％ for N and S,respectively).In addition,the BET surface area and total pore volume of CTF-DCBT are 500m2/g and 0.26cm3/g,respectively.CTF-DCBT possesses excellent thermal stability (450 ℃) and chemical stability towards boiling water,4 M HCl,and 1 M NaOH,The CO2 adsorption capacity of CTF-DCBT is 37.8 cm3/g at 1 bar and 25 ℃.After six adsorption-desorption cycles,there is no obvious loss of CO2 uptake observed.Due to the ultramicropore and high heteroatom contents,CTF-DCBT has high isosteric heats of adsorption for CO2 and high selectivities of CO2 over N2 and CH4.At 25 ℃,the CO2/N2 and CO2/CH4 selectivities are 112.5 and 10.3,respectively,which are higher than those of most POFs.Breakthrough curves indicate that CTF-DCBT could effectively separate CO2/N2 and CO2/CH4 mixtures.