Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (4): 540-545.doi: 10.1007/s40242-017-7002-4

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Fabrication of CeO2/rGO Nanocomposites with Oxidase-like Activity and Their Application in Colorimetric Sensing of Ascorbic Acid

WANG Jiangning, SU Ping, LI Di, WANG Ting, YANG Yi   

  1. Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2017-01-03 Revised:2017-05-01 Online:2017-08-01 Published:2017-07-19
  • Contact: YANG Yi E-mail:yangyi@mail.buct.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21675008) and the Fundamental Research Funds for the Central Universities of China(No.JD1516).

Abstract:

Nanomaterial-based artificial enzymes(nanozymes) have shown great potential for application in colorimetric sensing. In this paper, the nanocomposites of CeO2 and reduced graphene oxide(rGO) were fabricated via a one-pot hydrothermal process, in which CeO2 nanoparticles were well anchored on the surface of rGO. The prepared CeO2/rGO nanocomposites exhibited excellent catalytic activity for the oxidation of 3,3',5,5'-tetramethylbenzidine(TMB) in the presence of O2. Compared with the individual CeO2 nanoparticles, the nanocomposites had a higher affinity and adsorptivity towards the substrate TMB, which was due to the combination of rGO. In addition, based on the oxidase-like activity of CeO2/rGO nanocomposites, a facile and sensitive colormetric sensor for ascorbic acid(AA) was investigated. The detection limit of AA was low(0.15 μmol/L) and the linear detection range was between 0.5 μmol/L and 40 μmol/L. Furthermore, the colorimetric system was used for the detection of AA in medicine and food analysis, such as tablets, beverage and milk powder.

Key words: Nanozyme, Oxidase-like, Colorimetric, Ascorbic acid