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The decay of silver nanoparticles in preoxidation process
Jie Qin1, Minghao Sui1, Bojie Yuan1
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
The Science of the Total Environment
|November 7, 2017
Summary
Silver nanoparticles (Ag-NPs) decay into silver ions (Ag+) when exposed to common water treatment oxidants like sodium hypochlorite and hydrogen peroxide. Factors such as oxidant dosage, pH, and water composition influence this transformation.
Area of Science:
- Environmental Science
- Water Treatment Technologies
- Nanomaterial Fate and Transport
Background:
- Metal-based nanoparticles, including silver nanoparticles (Ag-NPs), are increasingly used but their environmental fate during water treatment is not fully understood.
- Water oxidation processes utilize strong oxidants to remove contaminants, potentially interacting with engineered nanomaterials.
Purpose of the Study:
- To investigate the transformation and decay of silver nanoparticles (Ag-NPs) when exposed to common water treatment oxidants.
- To identify factors influencing Ag-NP decay and understand the underlying mechanisms.
Main Methods:
- Experimental investigation of Ag-NP decay in the presence of sodium hypochlorite (NaClO), hydrogen peroxide (H2O2), and potassium permanganate (KMnO4).
- Analysis of Ag-NP dissolution into silver ions (Ag+) and morphological changes.
- Systematic evaluation of factors including oxidant dosage, pH, humic acid, ions (Ca2+), sulfide ions, and nanoparticle size.
Main Results:
- Ag-NPs dissolved into Ag+ and underwent morphological changes upon exposure to NaClO, H2O2, and KMnO4.
- Higher oxidant dosage, presence of Ca2+, and smaller Ag-NP size promoted Ag-NP decay.
- Humic acid and sulfide ions inhibited Ag-NP decay, while pH significantly affected the process.
Conclusions:
- Water oxidation preoxidants induce the transformation of Ag-NPs into Ag+ and alter their morphology.
- Environmental conditions and water matrix components play a critical role in mediating Ag-NP stability during water treatment.
- Understanding these interactions is crucial for assessing the environmental risks of nanomaterials in water systems.
Keywords:
Ag nanoparticlesHydrogen peroxideOxidation in water treatmentPotassium permanganateRelease of Ag+Sodium hypochloriteMore Related Videos
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