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Adsorbents with sustainable CO2 capture capacity prepared from carboxymethylcellulose

Published online by Cambridge University Press:  21 July 2014

Qiong Wu ,
Wei Li ,
Linlin Dai ,
Yanjiao Wu  and
Shouxin Liu
Qiong Wu
Affiliation:
Department of Chemical Processing of Forest Production, College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
Wei Li*
Affiliation:
Department of Chemical Processing of Forest Production, College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
Linlin Dai
Affiliation:
Department of Chemical Processing of Forest Production, College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
Yanjiao Wu
Affiliation:
Department of Chemical Processing of Forest Production, College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
Shouxin Liu*
Affiliation:
Department of Chemical Processing of Forest Production, College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Adsorbents with high specific surface areas, developed porosities, and sustainable CO2 capture capacity (∼180 mg/g at 25 °C, 1 bar) were prepared by KOH activation of hydrothermally carbonized carboxymethylcellulose (CMC). Condensed aromatic carbon materials (CSc) with particle diameters of 2–3 μm and many oxygen-containing groups on their surfaces can be obtained after hydrothermal treatment of CMC; these materials are similar to glucose-derived hydrothermal carbons. The activation conditions, including activation ratio and activation temperature, significantly influence the structure and morphology of the adsorbents. In turn, the pore structures, specific surface areas, and adsorption conditions significantly affect the adsorption capacities of these new adsorbents. For samples with the same activation ratio, those with higher specific surface areas show higher CO2 capture capacities at 25 °C and 1 bar. Under these conditions, for samples with different activation ratios, the capacity is dominated by the microporosity development and, in particular, the high volume of smaller micropores (d = 0.4–0.9 nm); when the adsorption pressure is decreased to 0.1 bar, the CO2 capture ability becomes closely correlated with the number of ultramicropores (d < 0.7 nm).

Keywords

adsorptionnanoscaleporosity
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 14 , 28 July 2014 , pp. 1565 - 1572
Copyright
Copyright © Materials Research Society 2014 

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