Sequestration of CO2 using Cu nanoparticles supported on spherical and rod-shape mesoporous silica |
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Authors: | Nezar H. Khdary Mohamed A. Ghanem Mamduoh E. Abdesalam Mohamed M. Al-Garadah |
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Affiliation: | 1. King Abdulaziz City for Science and Technology (KACST), P O Box 6086, Riyadh 11442, Saudi Arabia;2. Chemistry Department, Science College, King Saud University, Riyadh 11451, Saudi Arabia;3. King Khalid Academy, Riyadh, Saudi Arabia |
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Abstract: | The CO2 sequestration is one of the most promising solutions to tackle global warming. In this study, spherical mesoporous silica particles (MPS-S) and rod-shaped mesoporous silica particles (MPS-R) loaded with Cu nanoparticles were selectively prepared and employed for CO2 adsorption. For the first time uniform Cu nanoparticles were incorporated into the rod-shaped mesoporous silica particles by post-synthesis modification using both N-[3-(trimethoxysilyl)propyl]ethylenediamine (PEDA) and ethylenediamine (EDA) as coupling agents. The physiochemical properties of the mesoporous and copper grifted silica composites were investigated by CHN elemental analysis, FTIR spectroscopy, thermogravimetric analysis, X-ray diffraction, energy dispersive X-ray spectroscopy (EDX), surface area analysis, scanning, transmission electron microscopy and gas analysis system (GSD 320, TERMO). The mesoporous silica shows highly ordered mesoporous structures, with the rod-shaped particles having a higher surface area than the spherical ones. Copper nanoparticles with an average diameter of 6.0 nm were uniformly incorporated into the MPS-S and MPS-R. Moreover, Cu-loaded mesoporous silica exhibits up to 40% higher CO2 adsorption capacity than the bare MPS. The MPS-R modified with Cu nanoparticles showed a maximum CO2 adsorption capacity of 0.62 mmol/g and the humidity showed a slight negative effect on CO2 uptake process. The enhancement of CO2 adsorption onto transition metal/mesoporous substrates provides basis for imminent CO2 sequestration. |
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Keywords: | Mesoporous silica Cu nanoparticles |
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