Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (8): 1776.doi: 10.7503/cjcu20200183

• Analytical Chemistry • Previous Articles     Next Articles

Colorimetric Detection Method for H2O2 Based on Two-dimensional Metal-organic Frameworks of Metalloporphyrin

XIE Xingyu, ZHAO Yaxiang, ZHAO Lizhi, LI Rishun, WU Dihao, YE Hui, XIN Qingping, LI Hong, ZHANG Yuzhong   

  1. State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2020-04-07 Online:2020-08-10 Published:2020-07-31
  • Supported by:
    Supported by the National Key Research and Development Project, China(No.2017YFC0404001), the National Natural Science Foundation of China(No.21978216) and the Tianjin Undergraduate Training Program for Innovation and Entrepreneurship, China(No. 201810058083).

Abstract: Using iron tetra(4-carboxyphenyl)porphyrin(FeTCPP) as the organic ligand and copper ions as the metal nodes, the metal-organic frameworks(MOFs) of bimetallic Cu-FeTCPP were prepared by solvothermal method, and the two-dimensional ultrathin nanosheets(Cu-FeTCPP 2DMOFs) were synthesized by a surfactant-assisted method. Compared with the three-dimensional bulk MOFs(3DMOFs), the nanosheets had ultra-thin nanostructures and larger specific surface area. Cu-FeTCPP 2DMOFs with enzyme-like properties can catalyze the chromogenic oxidation of the substrate 3,3',5,5'-tetramethylbenzidine(TMB) by hydrogen peroxide(H2O2). The proportional relationship between the absorbance of the reaction products and the concentration of H2O2 enabled the determination of H2O2. In the steady state kinetic analysis, the Michaelis constants Km of the nanosheets were smaller than those of Cu-FeTCPP 3DMOFs, indicating that the nanosheets showed better affinity to the substrates. This is attributed to the larger specific surface area of ​​the 2D ultrathin structure and the higher accessibility of active sites. The colorimetric detection method for H2O2 based on Cu-FeTCPP 2DMOFs had a linear detection range of 3-1000 μmol/L and a limit of detection(LOD) of 2.08 μmol/L, showing application prospects in the detection of H2O2 in water.

Key words: Metalloporphyrin, Metal-organic framework, Enzyme mimics, H2O2 detection

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