Abstract
The increasing application of nanomaterials will inevitably lead to their release into the environment, which may pose a threat to the environment and human health. As such, there is an urgent need to detect various nanomaterials. In the present work, we present a novel, rapid, and simple visual detection of MnO2 nanosheets in buffer solution and environmental water sample. In this assay, a redox reaction between MnO2 nanosheets and 3,3′,5,5′-tetramethylbenzidine (TMB) occurred, leading to the oxidation of TMB to TMB diimine. This redox reaction generated different colors dependent on the concentration of MnO2 nanosheets, including colorless, blue, green, and yellow, which allowed semiquantitative detection of MnO2 nanosheets with the naked eye. The detection range of the visual assay was 2–15 μg/mL, and the minimum concentration of MnO2 nanosheets can be visually detected at concentrations down to 2.0 μg/mL. Moreover, the developed visual assay showed a high selectivity to MnO2 nanosheets over Mn2+ ions, tetramethylammonium hydroxide, hydrogen peroxide, graphene oxide, and graphitic carbon nitride nanosheets.
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Acknowledgments
The support of this research by the Foundation of Science and Technology Department of Sichuan Province (Grant No. 2015JY0053), Doctoral Program of Southwest University of Science and Technology (Grant No. 14zx7165), Teaching Reform Project of Southwest University of Science and Technology (Grant No. 15xn0077), and Undergraduate Innovation Fund Project of Southwest University of Science and Technology (Grant No. CX15-011) is gratefully acknowledged.
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He, Y., Wang, Z. & Long, D. Direct visual detection of MnO2 nanosheets within seconds. Anal Bioanal Chem 408, 1231–1236 (2016). https://doi.org/10.1007/s00216-015-9232-y
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DOI: https://doi.org/10.1007/s00216-015-9232-y