Multi-components reactions on construction carboxylic-rich conjugated polymeric crown ethers as sustainable materials for CO2-fixation and iodine vapor adsorption: Experimental and kinetics

• Published in: Journal of environmental chemical engineering Vol. 12; no. 2; p. 112279
• Main Authors: Zhang, Yuhang, Yan, Xiuli, Li, Ningning, Liu, Xuanbo, Wang, Xionglei, Hao, Yongjing, Zhu, Zheng, Yang, Jiajia, Qin, Shenjun, Chang, Tao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2024
• Subjects: CO2 fixation; Cyclic carbonates; Iodine vapor adsorption; Ionic polymers; Kinetics; Multi-components reactions; Cyclic carbonates; Iodine vapor adsorption; CO2 fixation; Kinetics; Multi-components reactions; Ionic polymers
• ISSN: 2213-3437; 2213-3437
• DOI: 10.1016/j.jece.2024.112279

Carbon dioxide, as an industrial waste gas, has a severe impact on the climate. Thus, efficient catalytic conversion of CO2 has attracted considerable attention worldwide. In this study, a series of crown ether-conjugated microporous polymer materials containing carboxylic groups (CCMPs) were synthesized through multi-components reactions in one pot. This synthesis involved the reaction of dialdehydebenzo-18-crown-6 with different monomers of amino and pyruvate in the presence of DDQ. Fourier transform infrared spectroscopy, carbon-13 cross-polarization magic angle spinning nuclear magnetic resonance, scanning electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy were used to characterize the CCMPs. Then, CCMPs were used in CO2 fixation and iodine vapor adsorption. The co-catalyst KI and CCMP-4 exhibited excellent activity in mild conditions, resulting in a 94% yield. The catalytic activity of the CCMP-4 was maintained after the five cycles. The kinetics of CCMP-4 was studied, and a potential reaction mechanism was proposed. The iodine adsorption experiments were conducted on CCMPs. The results showed that CCMPs exhibited excellent adsorption effects at 75 °C. The adsorption capacities of CCMP-1, CCMP-2, CCMP-3 and CCMP-4 were 3.02, 2.68, 2.72 and 3.21 g·g−1, respectively. The experimental results showed that CCMPs effectively absorbed iodine vapor and exhibited an excellent catalytic effect on CO2 cycloaddition under mild conditions, which is proved by density functional theory calculations further. [Display omitted] •The CCMPs possessed high catalytic efficiency for cyclic carbonate.•The adsorption experiment of iodine vapor was carried out to evaluate the adsorption effect of polymers.•The synergistic mechanism has been proved in terms of experimental results, dynamics and DFT calculation.