Novel Hybrid Composites Based on HKUST-1 and a Matrix of Magnetite Nanoparticles with Sustainable Materials for Efficient CO2 Adsorption

Abstract

AbstractDeveloping new sustainable and functional materials for greenhouse gas adsorption, such as carbon dioxide, is a central field of material chemistry that impacts the environmental sciences. Herein, two novel magnetic composites based on a nanoporous Cu2+-MOF, [Cu3(trimesate)2(H2O)3]n (HKUST-1) supported on a matrix of magnetite nanoparticles with sugarcane bagasse 1 or peanut shells 2 were prepared and studied in detail as adsorbent materials for CO2, CH4, and N2 at different pressures. The chemical composition and physical characteristics of the composites 1–2 were thoroughly studied by multiple spectroscopic tools (FTIR, PXRD), thermogravimetric analysis (TGA), Scanning Electron Microscopy (SEM), and BET measurements. The surface areas were estimated to be 91.3 m2 g−1 and 65.9 m2 g−1, respectively. In general, CO2 has a greater affinity to composites 1–2 compared to the other tested gases. The CO2 maximum adsorption capacities were estimated at 14.55 mmol g−1 and 3.76 mmol g−1 for 1 and 2, respectively. The CO2 adsorption efficiency of 1 is similar to those reported with the best adsorbent nanoporous materials that require a more laborious chemical synthesis. The capture mechanism of CO2 is attributed to multilayer adsorption on the heterogeneous surface of 1–2 as evidenced by the isotherm adsorption model parameters and spectroscopic experiments. The usage of magnetic composites of Cu2+-MOFs with these sustainable materials for gas adsorption has not been explored till now.