Oxidizing species can cause the production of reactive oxygen species (ROS) which induce oxidative stress that promotes damage to biological molecules like DNA.  The Fenton reaction produces the hydroxyl radical, which is a ROS and several metal ions can participate in the Fenton reaction to generate oxidizing species. Oxidative stress has been associated with neurodegenerative disorders, including Alzheimer's disease and Parkinson's disease. The catalytic activity of iron and iron oxide nanoparticles in the Fenton reaction has been well studied. However other metals nanoparticles with catalytic activity like silver nanoparticles is not yet well known.<br/>In this study, silver nanoparticles are used to evaluate the catalytic activity in the Fenton oxidation of the azo dye Allura red AC. The reaction’s kinetic was monitored measuring the dye absorbance at 495 nm. Reaction parameters like pH, temperature, iron, and dye concentration were kept constant whereas hydrogen peroxide and silver nanoparticles loading were varied. The results show that low concentration of hydrogen peroxide reduces the reaction rate and silver nanoparticles are efficient even with minimal catalyst loadings. Understanding the interaction of silver nanoparticles with the hydroxyl radical suggests the development of innovative methodologies to reduce the impact of oxidative stress in biomolecules.

Catalytic activity of silver nanoparticles in heterogeneous Fenton oxidation of azo dyes

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