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Preparation of Porous Carbons from Halloysite-Sucrose Mixtures

Published online by Cambridge University Press:  01 January 2024

Ai-ping Wang ,
Feiyu Kang ,
Zheng-Hong Huang  and
Zhancheng Guo
Ai-ping Wang
Affiliation:
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing 100084, China Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
Feiyu Kang*
Affiliation:
Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing 100084, China
Zheng-Hong Huang
Affiliation:
Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing 100084, China
Zhancheng Guo
Affiliation:
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Porous carbons rich in mesopores and with large pore volumes have been prepared by polymerization and carbonization of a carbon precursor, sucrose, within a matrix of the natural clay, halloysite. The carbon precursor was impregnated into the pores of halloysite and mostly deposited on the external surface of the halloysite rods during impregnation. The inorganic matrix was removed by washing the carbon-mineral composite with HF and HCl. The resultant carbons were characterized by nitrogen adsorption analysis and were found to possess a large specific surface area, a large total pore volume and significant mesoporosity, without an activation process being involved. The pore volume and mesoporosity were up to 1.86 cm3/g and 78%, respectively, even at low carbonization temperatures (500°C). The size of the mesopores of the resultant carbons is mainly between 3 and 30 nm and the dominant pore size is ∼3.7 nm. The carbonization temperature has significant effects on the pore-size distribution and structure of the resultant carbons and carbon-mineral composites, respectively. This process is relatively simple and expected to cost less than the high-temperature carbonization process in the preparation of mesoporous carbons with total pore volume and large specific surface areas.

Keywords

AdsorptionElectron MicroscopyNatural ClayPore VolumePore-size DistributionPorous Carbon
Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 4 , August 2006 , pp. 485 - 490
Copyright
Copyright © 2006, The Clay Minerals Society

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