Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (6): 971-977.doi: 10.1007/s40242-014-4218-4

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Surface Modifications of Halloysite Nanotubes with Superparamagnetic Fe3O4 Nanoparticles and Carbonaceous Layers for Efficient Adsorption of Dyes in Water Treatment

JIANG Ling1, ZHANG Chao1, WEI Junchao1,2, TJIU Wengweei3, PAN Jisheng3, CHEN Yiwang2, LIU Tianxi1,2   

  1. 1. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China;
    2. Institute of Polymers, Department of Chemistry, Nanchang University, Nanchang 330031, P. R. China;
    3. Institute of Materials Research and Engineering, Agency for Science, Technology and Research, Singapore 117602, Singapore
  • Received:2014-06-11 Revised:2014-07-14 Online:2014-12-01 Published:2014-08-13
  • Contact: LIU Tianxi E-mail:txliu@fudan.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.51125011).

Abstract:

Surface modification of halloysite nanotube(HNT) with in situ grown Fe3O4 nanoparticles and carbonaceous layers introduced by a hydrothermal carbonization process of glucose has been achieved. Structure and morphology investigations demonstrate that iron oxide nanoparticles are uniformly anchored on the halloysite and prevent the aggregations of halloysite and carbon, forming a protective layer that stabilizes and improves the property of HNT/Fe3O4/C nanocomposite. Magnetism characterization proves the superparamagnetic behavior of HNT/Fe3O4/C hybrid at room temperature, which makes it easily separated from dye solution under an external magnetic field. Exploration of adsorption ability demonstrates that the maximum adsorption capacity of the as-prepared HNT/Fe3O4/C nanocomposite for methylene blue(MB) is about twice and 1.5 times those of HNT/Fe3O4 and HNT according to Langmuir equation, respectively. The adsorption behavior investigations indicate that HNT/Fe3O4/C hybrid has a heterogeneous structure and shows a non-ideal monolayer adsorption that fits the Redlich-Peterson isotherm, and the adsorption process follows a pseudo-second-order kinetic model. Therefore, the as-prepared HNT/Fe3O4/C hybrid is a fast, separatable and superparamagnetic adsorbent with a good adsorption ability, demonstrating great potential in the application of water treatment.

Key words: Halloysite, Hydrothermal carbonization, Superparamagnetic iron oxide, Water purification