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Colorimetric detection uranyl ions based on the enhanced peroxidase-like activity by GO adsorption
Xi Lin1, Dongliang Xuan2, Hao Liang3
1College of Public Health, University of South China, Hengyang, 421001, PR China; Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, Hengyang, 421001, PR China; Jiading Center for Disease Control and Prevention, Shanghai, 201800, PR China.
Abstract:
Based on the fact that uranyl ions (UO22+) adsorbed on GO can enhanced the peroxidase-like activity of graphene oxide (GO), a novel colorimetric strategy for visualizing quantitative determination of uranyl ions was established. The peroxidase-like activity of GO-UO22+ nanocomposites was assessed by catalyzing H2O2 oxidation of TMB to produce a distinct color reaction. A good linearity between the UO22+ concentration and absorption at 652 nm was acquired in the range of 5.90 × 10-6 to 9.43 × 10-4 M with a detection limit of 4.70 μM. This strategy was also successfully applied to determination of uranyl ions in environmental water samples.
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