Abstract
Mixed Cu and Mg oxides on nitrogen-rich activated carbon (AC) from Nypha fruticans biomass were characterized and their CO2 adsorption performance was measured. Highly dispersed CuO and MgO nanoparticles on AC was obtained using an ultrasonic-assisted impregnation method. The optimum adsorbent is 5%CuO–25%MgO/AC having good surface properties of high surface area, pores volume and low particles agglomeration. The higher content of MgO of 5%CuO–25%MgO/AC adsorbent contributes to less metal carbide formation which increases their porosity, surface area and surface basicity. XPS analysis showed some amount of nitrogen content on the surface of the adsorbent which increased their surface basicity towards selective CO2 adsorption. The presence of moisture accelerated the CO2 chemisorption to form a hydroxyl layer on the surfaces. The 5%CuO–25%MgO/AC adsorbent successfully adsorbed CO2 via physisorption and chemisorption of 14.8 and 36.2 wt%, respectively. It was significantly higher than fresh AC with better selectivity to CO2.
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Acknowledgements
Authors thank the Universiti Kebangsaan Malaysia for funding this project under research Project Code: GUP-2016-056 and DIP-2016-010. Appreciations are given to the Centre of Research and Innovation Management (CRIM) and Department of Chemical and Process Engineering, UKM for the instruments facilities support.
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Isahak, W.N.R.W., Hasan, S.Z., Ramli, Z.A.C. et al. Enhanced physical and chemical adsorption of carbon dioxide using bimetallic copper–magnesium oxide/carbon nanocomposite. Res Chem Intermed 44, 829–841 (2018). https://doi.org/10.1007/s11164-017-3138-6
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DOI: https://doi.org/10.1007/s11164-017-3138-6