Silver nanoparticles in aquatic environments: Physiochemical behavior and antimicrobial mechanisms

Area of Science:

• Environmental Science
• Nanotechnology
• Chemistry

Background:

• Nanosilver (AgNPs) possesses unique properties and potent antimicrobial activity.
• Understanding nanosilver's behavior in aquatic environments is crucial due to its widespread use.
• Existing models for nanosilver dissolution and antimicrobial mechanisms are incomplete.

Purpose of the Study:

• To comprehensively review nanosilver's physicochemical behavior in aquatic settings.
• To critically assess the antimicrobial mechanisms of nanosilver.
• To identify research gaps and propose future research directions.

Main Methods:

• Literature review of nanosilver's dissolution, aggregation, and antimicrobial properties.
• Theoretical analysis of nanosilver dissolution kinetics and stability.
• Evaluation of existing models for silver ion release.

Main Results:

• Inconsistencies exist in determining nanosilver's thermodynamic stability.
• A two-stage model is proposed to improve predictions of silver ion release kinetics.
• Silver ion release is a primary antimicrobial mechanism, but AgNPs and ROS also contribute to toxicity.

Conclusions:

• Further research is needed to accurately determine nanosilver's thermodynamic stability.
• The proposed two-stage model may offer better predictions for silver ion release.
• A holistic understanding of nanosilver's antimicrobial mechanisms, including AgNPs and ROS, is essential for environmental risk assessment.