One-step synthesis of mesoporous ZnO@ZIF-8 composites for CO2, CH4, N2 adsorption and separation with potential application for industrial biogas
Essid M. Missaoui N. Alnakhli Z.H. Khari H. Barhoumi H. Alomari K.B. Dziejarski B. Kishibayev K. Serafin J.
10 June 2025Elsevier Ltd
Journal of Alloys and Compounds
2025#1032
The separation of CO₂ and N₂ from CH₄ is essential for improving natural gas quality, while capturing and eliminating CO₂ and CH₄ from the air is crucial for reducing greenhouse gas emissions. This study investigates the performance of a mesoporous ZnO@ZIF-8 composite for these purposes by examining its adsorption equilibrium for CO₂, CH₄, and N₂. The composite was prepared through a mechanical grinding technique utilizing a mortar and pestle and characterized by various analytical methods, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and nitrogen adsorption/desorption measurements. Adsorption isotherms for CO₂, CH₄, and N₂ were recorded at temperatures of 283, 298, 308, and 318 K and pressures up to 100 kPa, with the data being modeled using the Langmuir model. Additionally, separation selectivities for binary mixtures of CO₂/N₂, CO₂/CH₄, and CH₄/N₂, as well as biogas-like mixtures, were evaluated using the Ideal Adsorbed Solution Theory (IAST) model. At 298 K and 100 kPa, the selectivities for equimolar mixtures were found to be 9.13 for CO₂/N₂, 2.51 for CO₂/CH₄, and 3.63 for CH₄/N₂. Notably, the composite exhibited a CO₂ selectivity of 0.1086 at 283 K, which decreased to 0.0953 at 318 K, indicating the influence of temperature on CO₂ adsorption efficiency. Under these conditions, the adsorption capacities were measured at 3.0 mmol/g for CO₂ and 1.3 mmol/g for CH₄. These findings demonstrate the potential of the ZnO@ZIF-8 composite for efficient gas separation, particularly for enhancing biogas quality and contributing to greenhouse gas reduction through selective CO₂ capture.
Adsorption , Biogas purification , Solid-state synthesis , ZIF-8 , ZnO@ZIF-8 composite
Text of the article Перейти на текст статьи
Chemistry Department, College of Science, King Khalid University (KKU), P.O. Box 9004, Abha, 61413, Saudi Arabia
Laboratory of Advanced Materials and Interfaces (LIMA), University of Monastir, Faculty of Sciences of Monastir, Avenue of Environment, Monastir, 5000, Tunisia
Department of Chemistry, Faculty of Science and Humanities, Shaqra University, P.O. Box 33, Dawadmi, 17452, Saudi Arabia
Department of Physical Sciences, Chemistry Division, P. O. Box 114, Jazan, 45142, Saudi Arabia
Department of Chemistry and Chemical Engineering, Division of Energy and Materials, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden
Department of Space, Earth and Environment, Division of Energy Technology, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden
Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wroclaw, 50-370, Poland
Center of Physical-Chemical Methods of Research and Analysis, Al Farabi Kazakh National University, 96 A, Tole bi Street, Almaty, 050012, Kazakhstan
Department of Inorganic and Organic Chemistry, University of Barcelona, Martí i Franquès, 1-11, Barcelona, 08028, Spain
Chemistry Department
Laboratory of Advanced Materials and Interfaces (LIMA)
Department of Chemistry
Department of Physical Sciences
Department of Chemistry and Chemical Engineering
Department of Space
Faculty of Environmental Engineering
Center of Physical-Chemical Methods of Research and Analysis
Department of Inorganic and Organic Chemistry
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026