Synthesis and physicochemical characterization of NixZnx- Fe2O4/MWCNT nanostructures as enzyme mimetics with peroxidase-like catalytic activity

서지정보

· 발행기관 : 한국탄소학회
· 수록지 정보 : Carbon letters / 24권
· 저자명 : Navvabeh Salarizadeh, Minoo Sadri, Hassan Hosseini, Reza. H. Sajedi

목차

Abstract
1. Introduction
2. Experimental
2.1. Materials and methods
2.2. Synthesis of the NixZnxFe2O4/MWCNTnanocomposites
2.3. Characterization of the nanocomposites
2.4. Colorimetric assay of the peroxidase-likeactivity of the nanocomposites
2.5. Electrochemical analysis
3. Results and Discussion
3.1. Characterization of the NixZnxFe2O4/MWCNTnanocomposites
3.2. Colorimetric assay of the peroxidase-likeactivity of the NixZnxFe2O4/MWCNT nanocomposites
3.3. The effect of pH on the nanocatalyst activity
3.4. Effect of the H2O2 amount
3.5. Electrochemical analysis of the electrocatalysisactivity of the NixZnxFe2O4/MWCNTnanocomposites
4. Conclusions
Conflict of Interest
Acknowledgements
References

영어초록

Carbon-based magnetic nanostructures in several instances have resulted in improved physicochemical and catalytic properties when compared to multi-wall carbon nanotubes (MWCNTs) and magnetic nanoparticles. In this study, magnetic MWCNTs with a structure of NixZnxFe2O4/MWCNT as peroxidase mimics were fabricated by the one-pot hydrothermal method. The structure, composition and morphology of the nanocomposites were characterized with X-ray diffraction (XRD), Fourier transform infrared spectroscopy and transmission electron microscopy. The magnetic properties were investigated with a vibrating sample magnetometer. The peroxidase-like catalytic activity of the nanocomposites was investigated by colorimetric and electrochemical tests with 3,3´,5,5´-tetramethylbenzidine (TMB) and H2O2 as the substrates. The results show that the synthesis of the nanocomposites was successfully performed. XRD analysis confirmed the crystalline structures of the NixZnxFe2O4/ MWCNT nanohybrids and MWCNTs. The main peaks of the NixZnxFe2O4/MWCNTs crystals were presented. The Ni0.25Zn0.25Fe2O4/MWCNT and Ni0.5Zn0.5Fe2O4/MWCNT nanocatalysts showed nearly similar physicochemical properties, but the Ni0.5Zn0.5Fe2O4/MWCNT nanocatalyst was more appropriate than the Ni0.25Zn0.25Fe2O4/MWCNT nanocatalyst in terms of the magnetic properties and catalytic activity. The optimum peroxidase-like activity of the nanocatalysts was obtained at pH 3.0. The Ni0.5Zn0.5Fe2O4/MWCNT nanocatalyst exhibited a good peroxidase-like activity. These magnetic nanocatalysts can be suitable candidates for future enzyme-based applications such as the detection of glucose and H2O2.

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