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Issue 22, 2018
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H2O2/steam activation as an eco-friendly and efficient top-down approach to enhancing porosity on carbonaceous materials: the effect of inevitable oxygen functionalities on CO2 capture

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Abstract

Nanoporous materials have been developed as carbon dioxide (CO2)-capturing materials. In carbonaceous materials, physical activation by steam or CO2 is a common top-down method that is known to be effective for developing nanopores on carbon surfaces. However, it is less efficient at improving porosity compared to common chemical activation. Herein, we propose a simple and eco-friendly approach to improving the efficiency of physical activation in developing porosity on carbonaceous materials. Using hydrogen peroxide (H2O2) as an activating agent with pressure in the reactor resulted in significant enhancement compared with steam activation without pressure. However, a high number of oxygen functionalities were generated on the carbon surfaces, which interfered with CO2 capture performance (e.g., uptake, selectivity, and the adsorption rate). We used thermal reduction to remove oxygen functionalities on the carbon surface, which overcame the CO2 affinity and uptake loss caused by the oxygen functionalities. Therefore, the H2O2/steam activation approach may be used to improve the textural properties of carbonaceous materials. Furthermore, our work provides evidence that the oxygen functionalities of solid carbonaceous adsorbents influence CO2 capture performance, including practical applications.

Graphical abstract: H2O2/steam activation as an eco-friendly and efficient top-down approach to enhancing porosity on carbonaceous materials: the effect of inevitable oxygen functionalities on CO2 capture

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Publication details

The article was received on 14 Aug 2018, accepted on 16 Oct 2018 and first published on 26 Oct 2018


Article type: Paper
DOI: 10.1039/C8GC02570C
Citation: Green Chem., 2018,20, 5224-5234
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    H2O2/steam activation as an eco-friendly and efficient top-down approach to enhancing porosity on carbonaceous materials: the effect of inevitable oxygen functionalities on CO2 capture

    Y. Heo and S. Park, Green Chem., 2018, 20, 5224
    DOI: 10.1039/C8GC02570C

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