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Recyclable Nanocomposite of Flowerlike MoS2@Hybrid Acid-Doped PANI Immobilized on Porous PAN Nanofibers for the Efficient Removal of Cr(VI)

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journal contribution
posted on 23.11.2017 by Jinli Qiu, Fuqiang Liu, Song Cheng, Lidan Zong, Changqing Zhu, Chen Ling, Aimin Li
For the preparation of an ideal material for the emergency disposal of Cr­(VI)-contaminated water, a recyclable nanocomposite of molybdenum disulfide@hybrid acid-doped polyaniline immobilized on porous polyacrylonitrile nanofibers (MoS2@PANI/PAN nanocomposite) was synthesized successively through electrospinning, a hydrothermal process, and in situ polymerization. The advantages of the flowerlike MoS2@PANI/PAN nanocomposite include a fast equilibrium rate (30 min), a high removal capacity (6.57 mmol/g), and good recyclability. Thus, the material’s performance is much better than those of many earlier materials developed for similar applications. MoS2@PANI/PAN nanocomposite still showed high adsorption capacity toward Cr­(VI) in the presence of coexisting anions and natural organic matter. The remarkable interaction of this material with Cr­(VI) was shown to mainly occur through ion exchange, electrostatic adsorption, and reduction. Furthermore, the MoS2@PANI/PAN nanocomposite could be thoroughly regenerated and successfully reused for more than six cycles without a significant decrease in its removal capacity. Additional favorable properties of MoS2@PANI/PAN nanocomposite are its strong hydrophilic performance and high mechanical strength. Hence, MoS2@PANI/PAN provides a green, economic, and fast method to efficiently remove toxic Cr­(VI) from aqueous environments.