scholarly journals Colloidal stability of capped silver nanoparticles in natural organic matter-containing electrolyte solutions

NanoImpact ◽  
2020 ◽  
Vol 19 ◽  
pp. 100242
Author(s):  
Leonardo Gutierrez ◽  
Andreas Schmid ◽  
Noor Zaouri ◽  
Daniel Garces ◽  
Jean-Philippe Croue
Keyword(s):  
Silver Nanoparticles ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Colloidal Stability ◽  
Electrolyte Solutions

Effects of hydrophobicity-based fractions of Pony Lake fulvic acid on the colloidal stability and dissolution of oppositely charged surface-coated silver nanoparticles

2020 ◽  
Vol 17 (5) ◽  
pp. 400 ◽  
Author(s):  
YounJung Jung ◽  
Gabriele E. Schaumann ◽  
Seungyun Baik ◽  
George Metreveli
Keyword(s):  
Molecular Weight ◽  
Silver Nanoparticles ◽  
Organic Matter ◽  
Fulvic Acid ◽  
Functional Groups ◽  
Natural Organic Matter ◽  
Colloidal Stability ◽  
Coating Materials ◽  
Polar Functional Groups ◽  
Oppositely Charged

Environmental contextThe fate of silver nanoparticles (AgNPs) in aqueous systems could be influenced by the hydrophobicity of natural organic matter. We observed that the aggregation and dissolution of oppositely charged AgNPs were controlled by the selectivity and dynamics of sorption processes involving the nanoparticle surface and hydrophobic groups on natural organic matter. These findings will be helpful to understand the fate and effects of coated AgNPs in natural systems. AbstractThe fate of silver nanoparticles (AgNPs) released into aquatic environments is significantly affected by natural organic matter (NOM). However, current studies are still insufficient to understand interactions between NOM and AgNPs because they do not explicitly consider the heterogeneity of NOM. We investigated how NOM components with different properties (hydrophobicity, molecular weight, aromaticity, and polarity of functional groups) interact with AgNPs coated with citrate (Cit) and branched polyethylenimine (BPEI) and influence their colloidal stability and dissolution. Pony Lake fulvic acid (PLFA) selected as a model NOM was fractionated into hydrophobic (HPO) and transphilic (TPI) fractions. Sorption of PLFA molecules with a high content of polar functional groups bound to the aromatic rings onto nanoparticles was more favourable in the case of the TPI fraction, which most likely resulted in higher aggregation for both AgNPs and stronger protection of BPEI-AgNPs against dissolution compared with the HPO fraction. Additionally, in contrast to the Cit-AgNPs, resorption of Ag+ ions released from BPEI-AgNPs and/or sorption of Ag+-PLFA complexes to the nanoparticles was most likely a dynamic process, as suggested by the time-dependent changes in the molecular weight of the PLFA fractions sorbed to the BPEI-AgNP surface. These observations suggest that the accessibility of the AgNP surface for the hydrophobicity-based fractions of NOM as well as their colloidal stability and dissolution are controlled by the type and charge of coating materials and by the molecular weight, aromaticity, and content of polar functional groups of NOM.

scholarly journals Aging reduces the toxicity of pristine but not sulphidised silver nanoparticles to soil bacteria

2018 ◽  
Vol 5 (11) ◽  
pp. 2618-2630 ◽  
Author(s):  
Carolin L. Schultz ◽  
Joanna Gray ◽  
Rudo A. Verweij ◽  
Martí Busquets-Fité ◽  
Victor Puntes ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Soil Bacteria

Aging of silver nanoparticles shows soluble silver driving toxicity in ISO medium, but not in media containing natural organic matter.

Natural organic matter inhibits aggregation of few-layered black phosphorus in mono- and divalent electrolyte solutions

2019 ◽  
Vol 6 (2) ◽  
pp. 599-609 ◽  
Author(s):  
Zhiqiang Tan ◽  
Yongguang Yin ◽  
Xiaoru Guo ◽  
Bowen Wang ◽  
Heping Shang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Electrolyte Solutions ◽  
Black Phosphorus ◽  
Steric Repulsion

NOM coating enabled stabilization of BPs in CaCl2 solutions via steric repulsion and isolating Ca2+ ions from interaction with BPs.

Natural Organic Matter Alters Biofilm Tolerance to Silver Nanoparticles and Dissolved Silver

2012 ◽  
Vol 46 (22) ◽  
pp. 12687-12696 ◽  
Author(s):  
Stacy M. Wirth ◽  
Gregory V. Lowry ◽  
Robert D. Tilton
Keyword(s):  
Silver Nanoparticles ◽  
Organic Matter ◽  
Natural Organic Matter

scholarly journals Facile synthesis of graphene wool doped with oleylamine-capped silver nanoparticles (GW-αAgNPs) for water treatment applications

2021 ◽  
Vol 11 (11) ◽  
Author(s):  
Adedapo O. Adeola ◽  
Gugu Kubheka ◽  
Evans M. N. Chirwa ◽  
Patricia B. C. Forbes
Keyword(s):  
Silver Nanoparticles ◽  
Organic Matter ◽  
Adsorption Capacity ◽  
Natural Organic Matter ◽  
Elevated Temperatures ◽  
Maximum Adsorption Capacity ◽  
Facile Synthesis ◽  
Gram Positive ◽  
Gram Negative ◽  
Process Economics

AbstractThe facile synthesis of graphene wool doped with oleylamine-capped silver nanoparticles (GW-αAgNP) was achieved in this study. The effect of concentration, pH, temperature and natural organic matter (NOM) on the adsorption of a human carcinogen (benzo(a)pyrene, BaP) was evaluated using the doped graphene wool adsorbent. Furthermore, the antibacterial potential of GW-αAgNP against selected drug-resistant Gram-negative and Gram-positive bacteria strains was evaluated. Isotherm data revealed that adsorption of BaP by GW-αAgNP was best described by a multilayer adsorption mechanism predicted by Freundlich model with least ERRSQ < 0.79. The doping of graphene wool with hydrophobic AgNPs coated with functional moieties significantly increased the maximum adsorption capacity of GW-αAgNP over GW based on the qmax and qm predicted by Langmuir and Sips models. π-π interactions contributed to sorbent-sorbate interaction, due to the presence of delocalized electrons. GW-αAgNP-BaP interaction is a spontaneous exothermic process (negative $$\Delta H^\circ$$ Δ H ∘ and $$\Delta G)$$ Δ G ) , with better removal efficiency in the absence of natural organic matter (NOM). While GW is more feasible with higher maximum adsorption capacity (qm) at elevated temperatures, GW-αAgNP adsorption capacity and efficiency is best at ambient temperature, in the absence of natural organic matter (NOM), and preferable in terms of energy demands and process economics. GW-αAgNP significantly inhibited the growth of Gram-negative Pseudomonas aeruginosa and Gram-positive Bacillus subtilis strains, at 1000 mg/L dosage in preliminary tests, which provides the rationale for future evaluation of this hybrid material as a smart solution to chemical and microbiological water pollution.

scholarly journals Effects of natural organic matter and sulfidation on the flocculation and filtration of silver nanoparticles

2016 ◽  
Vol 3 (6) ◽  
pp. 1436-1446 ◽  
Author(s):  
Tongren Zhu ◽  
Desmond F. Lawler ◽  
Yunqi Chen ◽  
Boris L. T. Lau
Keyword(s):  
Silver Nanoparticles ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Granular Media ◽  
Traditional Theory ◽  
Initial Deposition ◽  
Self Aggregation

Environmental transformations had different effects on self-aggregation and initial deposition in granular media filtration, contrary to traditional theory.

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