Controlled Nucleation Growth and Mechanism of Simultaneous Capture of PM and CO2 in Conjugated Microporous Polymer-Carbon Nanotube Mixed Matrix Membranes

doi:10.7503/cjcu20240506

Abstract

Abstract:

Mixed matrix membranes（MMMs） are extensively utilized to enhance adsorption and separation performance by integrating the advantageous properties of polymers with organic and inorganic fillers. Conjugated microporous polymers（CMPs）， characterized by their hierarchical porous structure and abundant heteroatom adsorption sites， demonstrate efficient and stable gas adsorption and separation capabilities in complex environments. Herein， we constructed a CMPs membrane supported by a carbon nanotubes（CNTs） network， utilizing three-dimensional network structured CNTs as a flexible substrate and CMPs with hierarchical porous structures and abundant heteroatom adsorption sites as the adsorptive active layer， aiming to address the challenge of self-membrane formation in porous polymers during the preparation process. The fabricated CMP-CNTs membrane retains the three-dimensional reticulated structure of CNTs and the hierarchical porous structure of CMPs， ensuring efficient adsorption and separation of particulate matter（PM） and carbon dioxide/nitrogen（CO₂/N₂） while significantly reducing permeation resistance. In acidic and alkaline environments， the interception efficiency of CMP-CNTs for PM_3.0 exceeds 99.9%. The pore property characterization indicate that CMP-CNTs have dimensional characteristics similar to the molecular dynamic diameter of gases and a polar-induced environment caused by nitrogen and oxygen heteroatoms， giving them excellent CO₂/N₂ separation capacity. The selectivity of CMP-CNTs for the CO₂/N₂ mixture reaches an impressive value of 119 at 273 K and 1.0 bar（1 bar = 0.1 MPa）. This study proposes an MMM formed by coaxially covalently grafting CMPs onto the surface of CNTs to create a core-shell structure， thus demonstrating a processing approach that leverages the complementary advantages of porous polymers and flexible substrates， showcasing design flexibility and process universality.

Key words: Mixed matrix membrane, Coaxial covalent grafting, Core-shell structure, Acid/alkali tolerance, Particulate matter/CO₂ synchronous capture

CLC Number:

O631

TrendMD:

XU Mingwei, YANG Shangxue, LIU Guanlin, WANG Shaozhen, WANG Cunmin, LI Jiaqi, LI Xiang, ZHANG Yifan, ZHANG Mingming, HE Xinjian, XU Huan. Controlled Nucleation Growth and Mechanism of Simultaneous Capture of PM and CO₂ in Conjugated Microporous Polymer-Carbon Nanotube Mixed Matrix Membranes[J]. Chem. J. Chinese Universities, 2025, 46(4): 20240506.

Figures/Tables 8

References 35

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Capture material	IAST Selectivity	Ref.
AC⁃CMPs	15	［20］
O⁃CMPs	40	［19］
N⁃CMPs	79	［18］
Ta⁃CMP⁃CNTs	87	［21］
CMP⁃CNTs	119	This work

Capture material	IAST Selectivity	Ref.
AC⁃CMPs	15	［20］
O⁃CMPs	40	［19］
N⁃CMPs	79	［18］
Ta⁃CMP⁃CNTs	87	［21］
CMP⁃CNTs	119	This work

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Controlled Nucleation Growth and Mechanism of Simultaneous Capture of PM and CO₂ in Conjugated Microporous Polymer-Carbon Nanotube Mixed Matrix Membranes

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