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In situ crosslinking of poly(vinyl alcohol)/graphene oxide Nano-composite hydrogel: intercalation structure and adsorption mechanism for advanced Pb(II) removal

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Abstract

Based on the industrialized graphene oxide (GO) product, poly(vinyl alcohol) (PVA)/GO nano-composite hydrogels were prepared through in situ crosslinking by incorporation of N-[(trimethoxysilyl)propyl] ethylenediamine-triacetic acid sodium (CSA) as a compatibilizer. Introduction of CSA led to more efficient grafting of PVA molecules onto GO surface with increasing average layer thickness through covalent and hydrogen bonding interaction, while GO was exfoliated and uniformly distributed in PVA matrix. Addition of appropriate content of GO can improve the storage modulus and the effective crosslinking density (υe) of the composite hydrogel, and the network structure with GO as crosslinking point formed, resulting in the remarkable increase of the hydraulic impact resistance, mechanical strength and toughness of the hydrogel. Pb2+ adsorption capacity of the hydrogel increased with GO content, while the adsorption belonged to the second-order kinetic model and fitted Langmuir adsorption isotherm model, indicating the homogeneous nature of monolayer chemical adsorption of Pb2+. A relatively good reusability of the composite hydrogel beads for Pb2+ removal can be achieved.

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Acknowledgements

This work was financially supported by State Key Laboratory of Polymer Materials Engineering of China(Grant No. sklpme2016-2-07).

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  1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China

    Yeqiao Meng, Ge Zhang & Lin Ye

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  1. Yeqiao Meng
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Correspondence to Lin Ye.

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Meng, Y., Zhang, G. & Ye, L. In situ crosslinking of poly(vinyl alcohol)/graphene oxide Nano-composite hydrogel: intercalation structure and adsorption mechanism for advanced Pb(II) removal. J Polym Res 25, 168 (2018). https://doi.org/10.1007/s10965-018-1569-4

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  • DOI: https://doi.org/10.1007/s10965-018-1569-4

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