Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (1): 37-43.DOI: 10.6023/A21100454 Previous Articles     Next Articles



王自陶, 刘耀祖, 王钰杰, 方千荣*()   

  1. 吉林大学化学学院 无机合成与制备化学国家重点实验室 长春 130012
  • 投稿日期:2021-10-11 发布日期:2021-11-23
  • 通讯作者: 方千荣
  • 基金资助:

A New Covalent Organic Framework Modified with Sulfonic Acid for CO2 Uptake and Selective Dye Adsorption

Zitao Wang, Yaozu Liu, Yujie Wang, Qianrong Fang()   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, School of Chemistry, Jilin University, Changchun 130012, China
  • Received:2021-10-11 Published:2021-11-23
  • Contact: Qianrong Fang
  • Supported by:
    National Natural Science Foundation of China(22025504)

Environmental pollution is one of the most severe problems facing the earth today, including water pollution and the greenhouse effect caused by the indiscriminate discharge of organic dyes and abundant carbon dioxide emissions (CO2), respectively. Therefore, removing dyes from water and eliminating CO2 in the atmosphere is an urgent issue that needs to be solved. Among them, with low cost and high adsorption efficiency, porous materials have become one of the most common materials to adsorb organic dyes and uptake CO2. Covalent organic frameworks (COFs), as a burgeoning class of crystalline porous polymers, present a promising application potential in many areas, such as gas adsorption and separation, heterogeneous catalysis, semiconductors and sensors due to their regular pores, modifiable frameworks, extensive specific areas and excellent stability. Especially the introduction of the functional groups to the skeleton of COFs provides abundant active sites to adsorb specific dyes and uptake gases. Inspired by this, we report a microporous COF (JUC-603, JUC=Jilin University China) decorated with sulfonic acid group. This COF was successfully synthesized through β-ketoenamine based Michael addition-elimination reaction of 1,3,5-tris(3-dimethylamino-1-oxoprop-2-en-yl)benzene (TDOEB) and p-phenylenediamine (PPDA). A series of characterizations proved that JUC-603 had high crystallinity, opening microporous pore and excellent stability. Nitrogen adsorption-desorption isotherm revealed a high Brunauer-Emmett-Teller (BET) surface area (774 m2/g) and large pore size (1.6 nm). Moreover, we studied the adsorption of JUC-603 on dyes from aqueous solutions by ultraviolet- visible spectrophotometry and the uptake capacity through CO2 adsorption-desorption. These results showed that JUC-603 could selectively adsorb cationic dyes such as crystal violet and methylene blue as well as uptake CO2 effectively (52 cm3/g at 273 K and 0.1 MPa). The ideal performance was attributed to the modulation of active sulfonic acid sites on the framework of JUC-603. This research thus indicates that the COF as a promising functionalized porous material has great potential in environmental remediation.

Key words: porous material, covalent organic frameworks, dye adsorption, CO2 uptake, Michael addition-elimination reaction