Tags

Type your tag names separated by a space and hit enter

Citrate-Coated Silver Nanoparticles Interactions with Effluent Organic Matter: Influence of Capping Agent and Solution Conditions.
Langmuir. 2015 Aug 18; 31(32):8865-72.L

Abstract

Fate and transport studies of silver nanoparticles (AgNPs) discharged from urban wastewaters containing effluent organic matter (EfOM) into natural waters represent a key knowledge gap. In this study, EfOM interfacial interactions with AgNPs, and their aggregation kinetics were investigated by atomic force microscopy (AFM) and time-resolved dynamic light scattering (TR-DLS), respectively. Two well-characterized EfOM isolates, i.e., wastewater humic (WW humic) and wastewater colloids (WW colloids, a complex mixture of polysaccharides-proteins-lipids), and a River humic isolate of different characteristics were selected. Citrate-coated AgNPs were selected as representative capped-AgNPs. Citrate-coated AgNPs showed a considerable stability in Na(+) solutions. However, Ca(2+) ions induced aggregation by cation bridging between carboxyl groups on citrate. Although the presence of River humic increased the stability of citrate-coated AgNPs in Na(+) solutions due to electrosteric effects, they aggregated in WW humic-containing solutions, indicating the importance of humics characteristics during interactions. Ca(2+) ions increased citrate-coated AgNPs aggregation rates in both humic solutions, suggesting cation bridging between carboxyl groups on their structures as a dominant interacting mechanism. Aggregation of citrate-coated AgNPs in WW colloids solutions was significantly faster than those in both humic solutions. Control experiments in urea solution indicated hydrogen bonding as the main interacting mechanism. During AFM experiments, citrate-coated AgNPs showed higher adhesion to WW humic than to River humic, evidencing a consistency between TR-DLS and AFM results. Ca(2+) ions increased citrate-coated AgNPs adhesion to both humic isolates. Interestingly, strong WW colloids interactions with citrate caused AFM probe contamination (nanoparticles adsorption) even at low Na(+) concentrations, indicating the impact of hydrogen bonding on adhesion. These results suggest the importance of solution conditions and capping agents on the stability of AgNPs in solution. However, the characteristics of organics would play a crucial role in the fate and transport of these nano contaminants in urban wastewaters and natural water systems.

Authors+Show Affiliations

†Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Bentley, Western Australia 6102, Australia. ‡Facultad del Mar y Medio Ambiente, Universidad del Pacifico, Guayaquil, Ecuador.§Masdar Institute of Science and Technology, Masdar City, Abu Dhabi, United Arab Emirates.∥Escuela Superior Politécnica del Litoral, Guayaquil, Ecuador.†Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Bentley, Western Australia 6102, Australia. ⊥Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26230840

Citation

Gutierrez, Leonardo, et al. "Citrate-Coated Silver Nanoparticles Interactions With Effluent Organic Matter: Influence of Capping Agent and Solution Conditions." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 31, no. 32, 2015, pp. 8865-72.
Gutierrez L, Aubry C, Cornejo M, et al. Citrate-Coated Silver Nanoparticles Interactions with Effluent Organic Matter: Influence of Capping Agent and Solution Conditions. Langmuir. 2015;31(32):8865-72.
Gutierrez, L., Aubry, C., Cornejo, M., & Croue, J. P. (2015). Citrate-Coated Silver Nanoparticles Interactions with Effluent Organic Matter: Influence of Capping Agent and Solution Conditions. Langmuir : the ACS Journal of Surfaces and Colloids, 31(32), 8865-72. https://doi.org/10.1021/acs.langmuir.5b02067
Gutierrez L, et al. Citrate-Coated Silver Nanoparticles Interactions With Effluent Organic Matter: Influence of Capping Agent and Solution Conditions. Langmuir. 2015 Aug 18;31(32):8865-72. PubMed PMID: 26230840.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Citrate-Coated Silver Nanoparticles Interactions with Effluent Organic Matter: Influence of Capping Agent and Solution Conditions. AU - Gutierrez,Leonardo, AU - Aubry,Cyril, AU - Cornejo,Mauricio, AU - Croue,Jean-Philippe, Y1 - 2015/08/07/ PY - 2015/8/1/entrez PY - 2015/8/1/pubmed PY - 2016/5/11/medline SP - 8865 EP - 72 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 31 IS - 32 N2 - Fate and transport studies of silver nanoparticles (AgNPs) discharged from urban wastewaters containing effluent organic matter (EfOM) into natural waters represent a key knowledge gap. In this study, EfOM interfacial interactions with AgNPs, and their aggregation kinetics were investigated by atomic force microscopy (AFM) and time-resolved dynamic light scattering (TR-DLS), respectively. Two well-characterized EfOM isolates, i.e., wastewater humic (WW humic) and wastewater colloids (WW colloids, a complex mixture of polysaccharides-proteins-lipids), and a River humic isolate of different characteristics were selected. Citrate-coated AgNPs were selected as representative capped-AgNPs. Citrate-coated AgNPs showed a considerable stability in Na(+) solutions. However, Ca(2+) ions induced aggregation by cation bridging between carboxyl groups on citrate. Although the presence of River humic increased the stability of citrate-coated AgNPs in Na(+) solutions due to electrosteric effects, they aggregated in WW humic-containing solutions, indicating the importance of humics characteristics during interactions. Ca(2+) ions increased citrate-coated AgNPs aggregation rates in both humic solutions, suggesting cation bridging between carboxyl groups on their structures as a dominant interacting mechanism. Aggregation of citrate-coated AgNPs in WW colloids solutions was significantly faster than those in both humic solutions. Control experiments in urea solution indicated hydrogen bonding as the main interacting mechanism. During AFM experiments, citrate-coated AgNPs showed higher adhesion to WW humic than to River humic, evidencing a consistency between TR-DLS and AFM results. Ca(2+) ions increased citrate-coated AgNPs adhesion to both humic isolates. Interestingly, strong WW colloids interactions with citrate caused AFM probe contamination (nanoparticles adsorption) even at low Na(+) concentrations, indicating the impact of hydrogen bonding on adhesion. These results suggest the importance of solution conditions and capping agents on the stability of AgNPs in solution. However, the characteristics of organics would play a crucial role in the fate and transport of these nano contaminants in urban wastewaters and natural water systems. SN - 1520-5827 UR - https://www.unboundmedicine.com/medline/citation/26230840/Citrate_Coated_Silver_Nanoparticles_Interactions_with_Effluent_Organic_Matter:_Influence_of_Capping_Agent_and_Solution_Conditions_ L2 - https://doi.org/10.1021/acs.langmuir.5b02067 DB - PRIME DP - Unbound Medicine ER -