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J Colloid Interface Sci

Title:		Tannin-derived micro-mesoporous carbons prepared by one-step activation with potassium oxalate and CO(2)
Author(s):		Phuriragpitikhon J; Ghimire P; Jaroniec M;
Address:		"Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA. Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA. Electronic address: jaroniec@kent.edu"
Journal Title:		J Colloid Interface Sci
Year:		2020
Volume:		20190920
Issue:
Page Number:		55 - 67
DOI:		10.1016/j.jcis.2019.09.071
ISSN/ISBN:		1095-7103 (Electronic) 0021-9797 (Linking)
Abstract:		"Micro-mesoporous carbons (MMCs) were successfully prepared using natural polyphenolic compounds, condensed tannins, and glyoxal, a nontoxic aldehyde, in lieu of synthetic phenolic compounds like formaldehyde and resorcinol as carbon precursors. Such MMCs were fabricated by a soft-templating strategy under mild conditions. Porosity development was achieved by varying the amount of potassium oxalate as an in-situ activator coupled with one-step CO(2) activation at 700?ª+ degrees C. This strategy allowed for the enhancement of microporosity as well as retention of the uniform mesoporous structure of the carbons. The CO(2) uptakes of 5.2?ª+mmol/g at 0?ª+ degrees C and 3.6?ª+mmol/g at 25?ª+ degrees C were achieved at 1?ª+bar pressure for the tannin-derived activated MMC sample with a surface area of 1192?ª+m(2)/g, a volume of fine micropores (sizes below 1?ª+nm) of 0.33?ª+cm(3)/g, and a mesopore volume of 0.49?ª+cm(3)/g. This study opens new opportunities for a facile and green synthesis of MMCs from less toxic precursors with tailored porosity by synergistic effects of chemical and physical activation. The resulting MMCs exhibit the potential applicability not only as CO(2) sorbents but also in other environmental applications such as adsorption of organic volatile compounds and dye molecules, which require slightly larger pores"
Keywords:		CO(2) activation CO(2) adsorption Mesoporosity Microporosity Potassium oxalate Tannin;
Notes:		"PubMed-not-MEDLINEPhuriragpitikhon, Jenjira Ghimire, Pramila Jaroniec, Mietek eng 2019/10/05 J Colloid Interface Sci. 2020 Jan 15; 558:55-67. doi: 10.1016/j.jcis.2019.09.071. Epub 2019 Sep 20"