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Facile Synthesis of Oxidized Activated Carbon for High-Selectivity and Low-Enthalpy CO2 Capture from Flue Gas

Abstract

The prospect of a worsening climatic situation prompts us to develop energy-saving and cost-effective CO2 capture technologies. In this work, three oxidized activated carbons (ACO-n, n is 1~3) were prepared through a facile synthesis approach via oxidation in the presence of KMnO4 and concentrated H2SO4 for 0.5, 1.0 or 2.0 hours. Interestingly, these carbon materials ACO-n can take high CO2 capacity with low adsorption enthalpy and the selectivity toward flue gas can be adjusted by altering the period of oxidation. Among the pristine activated carbon and ACO-n materials, ACO-2 can take the highest CO2 capacity of 3.01 mmol g-1 at the ambient condiction with an adsorption enthalpy only of 23.1 kJ mol−1, slightly larger than the CO2 vaporization enthalpy. Its selectivity of 48.5 is double the value of the pristine activated carbon. Column breakthrough experiment was conducted to evaluate the CO2 separation capability on ACO-2 toward CO2/N2 (15:85 v/v) mixture under kinetic flow condition, which suggests that the oxidized activated carbon made from sustainable sources is promising for CO2 capture.

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Publication details

The article was received on 08 Jan 2018, accepted on 05 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C8NJ00109J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Facile Synthesis of Oxidized Activated Carbon for High-Selectivity and Low-Enthalpy CO2 Capture from Flue Gas

    S. Xiang, Z. Li, X. Ma, S. Xiong, Y. Ye, Z. Yao, Q. Lin and Z. Zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00109J

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