Highly sensitive and selective ion-imprinted polymers based on one-step electrodeposition of chitosan-graphene nanocomposites for the determination of Cr(VI)

Publication date: 1 September 2018
Source:Carbohydrate Polymers, Volume 195
Author(s): Shuping Wu, Xiangzi Dai, Tingting Cheng, Songjun Li
A sensitive and selective electrochemical sensor based on ion-imprinted chitosan-graphene nanocomposites (IIP-S) has been developed for the determination of Cr(VI). The ion-imprinted polymers were constructed by one-step electrodeposition. The morphology and structure of IIP-S were characterized by SEM, TEM, XRD, FTIR and EDS, respectively. Meanwhile, the electrochemical behavior of IIP-S was investigated using CV, EIS and DPV. The linear range of IIP-S was from 1.0 × 10⁻⁹ to 1.0 × 10⁻⁵ mol/L, with the low detection limit of 6.4 × 10⁻¹⁰ mol/L (S/N = 3). The sensor exhibited high selectivity for the determination of Cr(VI) in the presence of Zn(II), Co(II), Cu(II), Ni(II), Mn(II), MnO⁴⁻, C2O4²⁻, S2O6²⁻ and MoO4²⁻ ions. The IIP-S also provided excellent stability and good repeatability that the sensitivity remained 85% after 9 cycles of rebinding-removal, while the sensitivity retained 87% of its initial response storing at 4 °C for 17 days. Moreover, it was successfully applied to the detection of Cr(VI) ions in tap water and river water.

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