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J Colloid Interface Sci. 2014 Feb 15;416:243-51. doi: 10.1016/j.jcis.2013.11.012. Epub 2013 Nov 19.

Microporous spongy chitosan monoliths doped with graphene oxide as highly effective adsorbent for methyl orange and copper nitrate (Cu(NO3)2) ions.

Author information

1
College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
2
College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
3
Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
4
College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: rsong@ucas.ac.cn.

Abstract

In the current study, microporous spongy chitosan monoliths doped with small amount of graphene oxide (CSGO monoliths) with high porosity (96-98%), extraordinary high water absorption (more than 2000%) and low density (0.0436-0.0607 g cm(-3)) were prepared by the freeze-drying method and used as adsorbents for anionic dyes methyl orange (MO) and Cu(2+) ions. The adsorption behavior of the CSGO monoliths and influencing factors such as pH value, graphene oxide (GO) content, concentration of pollutants as well as adsorption kinetics were studied. Specifically, the saturated adsorption capacity for MO is 567.07 mg g(-1), the highest comparing with other publication results, and it is 53.69 mg g(-1) for Cu(2+) ions. Since they are biodegradable, non-toxic, efficient, low-cost and easy to prepare, we believe that these microporous spongy CSGO monoliths will be the promising candidates for water purification.

KEYWORDS:

Adsorption; Chitosan; Graphene oxide; Methyl orange (MO); Water purification

PMID:
24370428
DOI:
10.1016/j.jcis.2013.11.012
[Indexed for MEDLINE]

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