Intrinsic peroxidase-like activity and enhanced photo-Fenton reactivity of iron-substituted polyoxometallate nanostructures

Dalton Transactions : an International Journal of Inorganic Chemistry
Akif ZebAn-Wu Xu

Abstract

Heteropolyacids (HPAs) are a class of polyoxometallates (POMs) with oxygen-rich surfaces. Herein, we have developed an Fe-containing heteropolyacid by cation-exchange and employed KFePW12O40 nanostructures for Fenton, photo-Fenton and enzyme-mimetic reactions. The as-prepared KFePW12O40 catalyst exhibits efficient degradation of Rhodamine B (RhB) via the photo-Fenton reaction. As an enzyme-mimetic, this material can effectively oxidize TMB and dopamine. The obtained nanomaterials were characterized via SEM, TEM, XPS, BET surface area, TGA, UV-Vis spectroscopy, FT-IR, and XRD techniques. The photocatalyst has a relatively large surface area of 38 m2 g-1, and the Keggin structure of phosphotungstic ions is kept intact during the preparation. The RhB dye pollutants can be efficiently bleached and degraded up to about 80% within a one hour photo-Fenton reaction under visible light irradiation. Our results indicate that the KFePW12O40 nanomaterial can effectively mimic the enzyme cascade reaction of horseradish peroxidase (HRP). It also has a high affinity toward 3,3',5,5'-tetramethylbenzidine (TMB) for oxidation and henceforth, it has been used for the colorimetric assay of dopamine and H2O2. Overall, our study suggests that KFePW1...Continue Reading

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Citations

May 6, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Quanming PengXinjun Li
Oct 18, 2019·Scientific Reports·Boyu ZhangChunyan Wang
Nov 17, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Hemraj ChhipaSuresh K Bhargava

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Methods Mentioned

BETA
biosensing
transmission electron microscopy
scanning electron microscopy
X-ray

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