Catalytic activity improvement by one-dimensional structure nanocomposite for hydrogen peroxide detection in occupational exposure monitoring

ABSTRACT

The peroxidase reaction conducted by catalyst was used for colorimetric detection of H₂O₂. A new catalyst with one-dimensional structure is presented for oxidation reaction. Regarding the widespread use and harmful effects of Hydrogen peroxide (H₂O₂) providing a suitable method is essential. A nanocomposite of zinc oxide rods was prepared in the surface of magnetic nano silica aerogel (ZnR-MSiA). The synthesized nanocomposite was identified using Brunauer–Emmett–Teller (BET), X-ray diffraction spectroscopy (EDS) and scanning electron microscopy (SEM). The catalytic activity of one-dimensional ZnR-MSiA was compared with zinc oxide. Finally, a colorimetric method was validated for H₂O₂ detection in air samples. The synthesises of ZnR-MSiA nanocomposite were confirmed with the presence of Fe, O, Si and Zn in EDS analysis. One-dimensional chemical with pentagonal structure was highlighted with the SEM technique. This nanocomposite was used for peroxidase-like catalysis of hydrogen peroxide determination. The results show that the catalytic activity of ZnR-MSiA is higher than zinc oxide. The maximum peroxidation reaction was obtained with 0.294 mg of ZnR-MSiA and TMB of 10.946 mmol/L at pH = 2.61. The investigated method was evaluated using LOD, LOQ, and recovery parameters at the level of 0.14 ppm, 0.42 ppm, and 98.21%, respectively, in a linear range of 0.5–50 ppm. The determination of H₂O₂ in occupational exposure samples was determined to be better than the OSHAVI-6 method. A new nano-catalyst for oxidation reaction with higher affinity to H2O2 and higher speed was produced. Based on the studies, unic electron transportation properties of one-dimensional structures are highlighted for colorimetric detection of H₂O₂. In conclusion, an applicable nanocomposite is suggested for sensitive, accurate and reproducible detection of H₂O₂ samples.

KEYWORDS:

• Hydrogen peroxide
• nanocomposite
• colorimetric method
• zinc oxide rods
• one-dimensional structure
• peroxidase-like

Acknowledgments

This study is related to the project NO 1401/59302 from Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran. We also appreciate the “Student Research Committee” and “Research & Technology Chancellor” in Shahid Beheshti University of Medical Sciences for their financial support of this study.

Disclosure statement

No potential conflict of interest was reported by the author(s).