Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Aggregation Behavior of Silver and TiO2 Nanoparticles in Aqueous Environment

수환경 특성에 따른 은과 이산화티탄 나노입자의 응집 특성 연구

  • 임명희 (안전성평가연구소, 미래환경연구센터) ;
  • 배수진 (안전성평가연구소, 미래환경연구센터) ;
  • 이용주 (안전성평가연구소, 미래환경연구센터) ;
  • 이성규 (안전성평가연구소, 미래환경연구센터) ;
  • 황유식 (안전성평가연구소, 미래환경연구센터)
  • Received : 2013.08.23
  • Accepted : 2013.10.10
  • Published : 2013.10.15
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Abstract

The aggregation behaviors of silver nanoparticles (AgNPs) and titanium dioxide ($TiO_2$) nanoparticles were investigated. Time-resolved dynamic light scattering (DLS) was used to study the initial aggregation of AgNPs and $TiO_2$ over a range of mono (NaCl) and divalent ($CaCl_2$) electrolyte concentrations. The effects of pH, initial concentration of NPs and natural organic matters (NOM) on the aggregation of NPs were also investigated. The aggregation of both nanoparticles showed classical Derjaguin-Landau-Verwey-Overbeek (DLVO) type behavior. Divalent electrolyte was more efficient in destabilize the AgNPs and $TiO_2$ than monovalent electrolyte. The effect of pH on the aggregation of AgNPs was not significant. But the aggregation rate of $TiO_2$ was much higher with increasing pH. Higher NPs concentration leads to faster aggregation. Natural organic matter (NOM) was found to substantially hinder the aggregation of both AgNPs and $TiO_2$. This study found that the aggregation behavior of AgNPs and $TiO_2$ are closely associated with environmental factors such as ionic strength, pH, initial concentration of NPs and NOM.

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References

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