Ultra-stable hollow nanotube conjugated microporous polymer incorporating fluorenyl moieties for Co-capture of PM and CO2

• Published in: Journal of hazardous materials Vol. 468; p. 133826
• Main Authors: Zhao, Li, Wang, Shaozhen, Li, Zhen, Jiang, Yanli, Liu, Xinrui, Ouyang, Hang, Xiong, Zhengshao, Guo, Yu, Li, Yang, Lei, Yang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2024
• Subjects: Hierarchy porous structure; Hollow nanotube; MESP calculations; Tolerance and renewability; Trapping mechanism; Hollow nanotube; Hierarchy porous structure; Trapping mechanism; MESP calculations; Tolerance and renewability
• DOI: 10.1016/j.jhazmat.2024.133826
• ISSN: 0304-3894

Conjugated microporous polymers have a highly delocalized π-π conjugated porous skeleton connected by covalent bonds, which can combine their excellent stability with high adsorption, in order to be applied to the study of co-capture of harmful particulate matter (PM) and carbon dioxide (CO2) under high temperature and high humidity conditions. In this paper, fluorene-based coupled conjugated microporous polymers (D-CMPs) with functionalized hollow nanotubes and abundant microporous structures were proposed. Through mechanism exploration and molecular electrostatic potential (MESP) calculation, the capture efficiency, adsorption capacity and selectivity of PM and CO2 in the waste gas stream of carbon-based combustion were analyzed. The results indicate that D-CMPs, with their rigid carbon-based π-conjugated framework, exhibit excellent tolerance under prolonged high-humidity conditions, with a capture efficiency exceeding 99.87% for PM0.3 and exceeding 99.99% for PM2.5. Meanwhile, based on its chemical/thermal stability, it can realize the recycling of adsorption-regeneration. On this basis, the "slip effect" induced by the open three-dimensional hierarchical porous structure of D-CMPs significantly enhances airflow dispersion and improves gas throughput (with a minimal permeation resistance of only 15 Pa). At a pressure of 1 bar and a temperature of 273.15 K, D-CMP-2 exhibited a CO2 adsorption capacity of up to 2.69 mmol g−1. The fitting results of three isothermal adsorption models demonstrate that D-CMPs exhibit an outstanding equilibrium selectivity towards CO2. Therefore, prior to the widespread adoption of low-carbon and clean energy technologies, porous solid materials exhibiting excellent structural stability, equilibrium selectivity, environmental tolerance, and high adsorption capacity emerge as optimal candidates for the treatment of industrial waste gases. [Display omitted] •The fluorenyl active site gives D-CMPs excellent adsorption properties of CO2 and PM.•The monolithic D-CMPs allows for processing for physical shaping and bending.•D-CMPs is stable and reproducible in high-temperature and humid environments.•The trapping mechanism of PM and CO2 was analyzed from the electrostatic interaction.•PM and CO2 co-processing technologies will play an important role.