Honeycomb-like structure-tunable chitosan-based porous carbon microspheres for methylene blue efficient removal

Weijie Deng; Shuwei Tang; Xi Zhou; Ye Liu; Shijie Liu; Jiwen Luo

doi:10.1016/j.carbpol.2020.116736

Honeycomb-like structure-tunable chitosan-based porous carbon microspheres for methylene blue efficient removal

Carbohydr Polym. 2020 Nov 1:247:116736. doi: 10.1016/j.carbpol.2020.116736. Epub 2020 Jul 7.

Authors

Weijie Deng¹, Shuwei Tang², Xi Zhou¹, Ye Liu¹, Shijie Liu³, Jiwen Luo⁴

Affiliations

¹ School of Environment, South China Normal University, Guangzhou 510006, China.
² State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
³ State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Department of Paper and Bioprocess Engineering, State University of New York, College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210, USA.
⁴ School of Environment, South China Normal University, Guangzhou 510006, China; Key Laboratory of Theoretical Chemistry of Environment Ministry of Education, South China Normal University, Guangzhou 510006, China. Electronic address: holdit@126.com.

PMID: 32829856
DOI: 10.1016/j.carbpol.2020.116736

Abstract

Chitosan (CS) can be used for the preparation of carbon materials with different morphologies due to its excellent properties, but there are no reports on its spherical morphology. In this study, a feasible step-by-step strategy was proposed to fabricate nitrogen-containing chitosan-based porous carbon microspheres (CPCM) in HCl and KOH. The unique spherical morphology and honeycomb-like porous structure of CPCM were accurately regulated. A great quantity of micro/mesopores endowed CPCM an ultra-high specific surface area up to 2463.9 m² g^-1. Moreover, CPCM exhibited an ultra-high maximum adsorption capacity up to 1599.03 mg g^-1 for methylene blue (MB), meanwhile the adsorption process was in well agreement with the Langmuir isotherm and pseudo-second-order kinetic models. It was simultaneously a favorable reusable adsorbent with high regenerative capacity. The high dye adsorption properties suggest that chitosan can be a promising candidate for sewage treatment in the form of carbon microspheres.

Keywords: Adsorption; Chitosan; Honeycomb-like structure; Methylene blue; Porous carbon microspheres.