Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (3): 463-470.doi: 10.1007/s40242-019-8369-1

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A Layered Chitosan/Graphene Oxide Sponge as Reusable Adsorbent for Removal of Heavy Metal Ions

ZHANG Di, LI Ning, CAO Shuai, LIU Xi, QIAO Mingwu, ZHANG Pingan, ZHAO Qiuyan, SONG Lianjun, HUANG Xianqing   

  1. College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, P. R. China
  • Received:2018-11-27 Revised:2019-02-28 Online:2019-06-01 Published:2019-03-27
  • Contact: LI Ning E-mail:lining8028@126.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.31201878, U1204804), the Postdoctoral Foundation of China(No.2015M572109) and the Postdoctoral Fund of Henan Province, China(No.2014049).

Abstract: Along with the growing severity of environment problem and energy crisis, it is inevitable to develop novel materials, which are contributed to the removal of hazardous pollutants from contaminated water. Herein, we reported a facile method for the preparation of free-standing chitosan/graphene oxide(CS/GO) composite sponges with low density, where CS/GO mixtures were first synthesized by the homogeneous reaction of chitosan and graphene oxide in aqueous acetic acid solution; then CS/GO sponges were obtained by lyophilizing the suspension, which were prefrozen at -20℃ and in liquid nitrogen successively. The obtained layered sponge showed good water-driven shape memory effect and was a good adsorbent of Co2+ and Ni2+ with a large adsorption capacity of 224.8 and 423.7 mg/g, respectively. Importantly, the successive adsorption-desorption studies employing CS/GO sponge indicated that the composite could be regenerated by HCl solution and reused in more than five cycles with regeneration efficiency beyond 80%. Also, the resultant sponge was explored as an exceptionally adsorbent for the removal of organic dye(e.g., methylene blue, MB).

Key words: Adsorption, Heavy metal, Graphene oxide, Chitosan, Layered structure