Comprehensive Adsorption–Desorption Kinetics of Shaped UTSA-16(Co)/Polyacrylate Composites for Fixed-Bed CO2 Capture
- 1State Key Laboratory of Chemistry for NBC Hazards Protection, Beijing 100191, China
- 2College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- 3Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, Tiangong University, Tianjin 300387, China
Abstract
Pristine metal–organic frameworks (MOFs) generally suffer from low mechanical strength and poor processability, hindering their direct application in fixed-bed adsorption systems. In this work, we propose a stepwise impregnation strategy that enables uniform in-situ crystallization of UTSA-16(Co) within amino-functionalized polyacrylate (PAA-NH2) matrices via pre-anchored cobalt ion sites, designed to overcome the low loading and inhomogeneous distribution issues of conventional one-step impregnation methods. Three synthesis protocols (one-step impregnation, stepwise impregnation, and secondary growth) were systematically compared, and the stepwise approach achieved the highest MOF loading of 53 wt%. The optimal composite exhibited a thermogravimetric (TGA) pure-CO2 uptake of 95.0 mg/g at 25 °C and 1 bar and retained 98.6% of its initial capacity after 10 consecutive adsorption–desorption cycles, indicating good short-term cyclic stability. Systematic fixed-bed tests revealed that the empirical Avrami fractional-order model (R2 ≥ 0.994) accurately described the heterogeneous adsorption kinetics of the composite, and the dynamic breakthrough behavior was jointly regulated by gas flow rate, bed temperature, inlet CO2 concentration, and relative humidity. The composite was found to be moisture-sensitive: at 60% RH, the capacity fell by 52.6%. A desorption efficiency above 99% was achieved within 20 min under optimal conditions (90 °C, 0.6 L/min purge gas). Overall, this work provides systematic kinetic data and operational guidelines for the optimization of MOF–polymer composite adsorbents in laboratory-scale fixed-bed applications.
Related
- A swing-type solid-state host–guest system enabling spontaneous adsorption–desorption cycling
- Toxic Aromatics Inclusion and Water Vapor Adsorption/Desorption of a 3D Supramolecular Architecture via π–π Assembly of 2D Zn-Based Layered MOFs
- The Role of Carbon Fibers in FFF 3D Printed Composites: A Comprehensive Review on the Effect on Mechanical Properties, Fracture Toughness, and Tribological Performance
- The Kinetics of Polymer Adsorption in Transport Through Porous Media: Basic Theory
- Geometry-Controlled Dynamic Tensiometry Resolves Intrinsic Surfactant Adsorption Kinetics
BibTeX
@article{zhang2026comprehensive,
title = {{Comprehensive Adsorption–Desorption Kinetics of Shaped UTSA-16(Co)/Polyacrylate Composites for Fixed-Bed CO2 Capture}},
author = {Xiangmei Zhang and Chunlai Wang and Zhejiaji Zhu and Wanyue Zang and Yuan Sun and Li Lv},
journal = {Nanomaterials},
year = {2026},
month = oct,
doi = {10.3390/nano16211341},
url = {https://www.mdpi.com/2079-4991/16/21/1341},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Comprehensive Adsorption–Desorption Kinetics of Shaped UTSA-16(Co)/Polyacrylate Composites for Fixed-Bed CO2 Capture
AU - Xiangmei Zhang
AU - Chunlai Wang
AU - Zhejiaji Zhu
AU - Wanyue Zang
AU - Yuan Sun
AU - Li Lv
PY - 2026
DA - 2026/10/22
JO - Nanomaterials
DO - 10.3390/nano16211341
UR - https://www.mdpi.com/2079-4991/16/21/1341
AB - Pristine metal–organic frameworks (MOFs) generally suffer from low mechanical strength and poor processability, hindering their direct application in fixed-bed adsorption systems. In this work, we propose a stepwise impregnation strategy that enables uniform in-situ crystallization of UTSA-16(Co) within amino-functionalized polyacrylate (PAA-NH2) matrices via pre-anchored cobalt ion sites, designed to overcome the low loading and inhomogeneous distribution issues of conventional one-step impregnation methods. Three synthesis protocols (one-step impregnation, stepwise impregnation, and secondary growth) were systematically compared, and the stepwise approach achieved the highest MOF loading of 53 wt%. The optimal composite exhibited a thermogravimetric (TGA) pure-CO2 uptake of 95.0 mg/g at 25 °C and 1 bar and retained 98.6% of its initial capacity after 10 consecutive adsorption–desorption cycles, indicating good short-term cyclic stability. Systematic fixed-bed tests revealed that the empirical Avrami fractional-order model (R2 ≥ 0.994) accurately described the heterogeneous adsorption kinetics of the composite, and the dynamic breakthrough behavior was jointly regulated by gas flow rate, bed temperature, inlet CO2 concentration, and relative humidity. The composite was found to be moisture-sensitive: at 60% RH, the capacity fell by 52.6%. A desorption efficiency above 99% was achieved within 20 min under optimal conditions (90 °C, 0.6 L/min purge gas). Overall, this work provides systematic kinetic data and operational guidelines for the optimization of MOF–polymer composite adsorbents in laboratory-scale fixed-bed applications.
SN - 2079-4991
ER -