Separation of CO2 from CH4 by synthesis hybrid of metal-organic frameworks and covalent-organic frameworks
Document Type : Research Paper
Authors
- 1 Department of Environmental Engineering, Faculty of Environment, University of Tehran, Tehran, Iran
- 2 Department of Environment, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
Abstract
This study synthesized a hybrid COF@MOF nanocomposite combining metal-organic and covalent organic frameworks to enhance CO₂/CH₄ adsorption. An amine-functionalized COF was hydrothermally synthesized to boost selectivity and capacity. Characterization via XRD, SEM, FTIR, and BET analysis confirmed the nanocomposite's structure and high surface area. Adsorption tests under controlled temperature (25–70°C), pressure (0.2–1 bar), and gas concentrations (100 ppm CO₂, 25,000 ppm CH₄) followed a Taguchi L9 orthogonal array. Results revealed pressure-dependent adsorption (direct relationship) and temperature-dependent desorption (inverse relationship), with CO₂ uptake further enhanced by amine-CO₂ acid-base reactions and increased surface area. The process adhered to the Freundlich isotherm, indicating multilayer adsorption. Remarkably, 10 consecutive adsorption-desorption cycles showed <5% efficiency loss, demonstrating exceptional reusability. This work highlights COF@MOF as a high-performance, stable adsorbent for industrial GHG capture, achieving optimized conditions through systematic Taguchi-ANOVA analysis while minimizing experimental runs.
Keywords
Subjects
environment
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