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Abstract
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Background: O-phenylenediamine (OPD) is a colorless, non-fluorescent compound which can be oxidized by molecular oxygen or hydrogen peroxide in the presence of metal ions, forming 2,3– diaminophenazine (DAP) as the main oxidation product [1]. Since the oxidation of OPD by H2O2 or O2 proceeds very slowly, the reaction needs to be catalyzed. The resultant solution of DAP has an orange–red color and exhibits an orange‐yellow fluorescence when irradiated by ultraviolet light [2]. The concentration of DAP is usually determined by using UV–Vis spectroscopy. Methods: In this work, ferrite nanoparticles (NPs) were synthesized using a co‐precipitation method and followed by a solvothermal reaction to form zirconium-based metal-organic framework/ferrite nanocomposite (ZrMOF/Zn-NiFe2O4 NC) and characterized by a combination of physico‐chemical and spectroscopic techniques. The prepared NC was used as a nano-catalyst for oxidation of OPD to DAP.
Results: Herein, we report the results of a thorough investigation on the chromogenic oxidation of OPD to DAP in the presence of the synthesized ZrMOF/Zn-NiFe2O4 NC as the reaction catalyst. The characterization results show successful preparation of the NC. Then, the ZrMOF/Zn-NiFe2O4/OPD system was effectively used for the detection of H2O2 under the optimized conditions.
Conclusion: A simple co‐precipitation technique followed by a solvotherml method was used for the preparation of ZrMOF/Zn-NiFe2O4 NC. The NC was tested as a catalyst in the chromogenic oxidation of OPD to DAP by monitoring the absorbance of DAP at 415 nm by means of a UV–Vis absorption spectrometer
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