Evaluation of the stability of soil nanoparticles: the effect of natural organic matter in electrolyte solutions

2017 ◽  
Vol 68 (1) ◽  
pp. 105-114 ◽  
Author(s):  
X. Zhu ◽  
H. Chen ◽  
W. Li ◽  
Y. He ◽  
P. C. Brookes ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Electrolyte Solutions ◽  
The Stability

Influence of Salts and Natural Organic Matter on the Stability of Bacteriophage MS2

Langmuir ◽  
2010 ◽  
Vol 26 (2) ◽  
pp. 1035-1042 ◽  
Author(s):  
Steven E. Mylon ◽  
Claudia I. Rinciog ◽  
Nathan Schmidt ◽  
Leonardo Gutierrez ◽  
Gerard C. L. Wong ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Bacteriophage Ms2 ◽  
The Stability

scholarly journals Stability of Fe-oxide nanoparticles coated with natural organic matter under relevant environmental conditions

2014 ◽  
Vol 70 (12) ◽  
pp. 2040-2046 ◽  
Author(s):  
L. Chekli ◽  
S. Phuntsho ◽  
L. D. Tijing ◽  
J. L. Zhou ◽  
J.-H. Kim ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Environmental Conditions ◽  
Divalent Cations ◽  
Oxide Nanoparticles ◽  
Fe Oxide ◽  
Coated Nanoparticles ◽  
Aggregation Behaviour ◽  
Physico Chemical ◽  
The Stability

Manufactured nanoparticles (MNPs) are increasingly released into the environment and thus research on their fate and behaviour in complex environmental samples is urgently needed. The fate of MNPs in the aquatic environment will mainly depend on the physico-chemical characteristics of the medium. The presence and concentration of natural organic matter (NOM) will play a significant role on the stability of MNPs by either decreasing or exacerbating the aggregation phenomenon. In this study, we firstly investigated the effect of NOM concentration on the aggregation behaviour of manufactured Fe-oxide nanoparticles. Then, the stability of the coated nanoparticles was assessed under relevant environmental conditions. Flow field-flow fractionation, an emerging method which is gaining popularity in the field of nanotechnology, has been employed and results have been compared to another size-measurement technique to provide increased confidence in the outcomes. Results showed enhanced stability when the nanoparticles are coated with NOM, which was due to electrosteric stabilisation. However, the presence of divalent cations, even at low concentration (i.e. less than 1 mM) was found to induce aggregation of NOM-coated nanoparticles via bridging mechanisms between NOM and Ca2+.

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.

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

Impact of natural organic matter and divalent cations on the stability of aqueous nanoparticles

2009 ◽  
Vol 43 (17) ◽  
pp. 4249-4257 ◽  
Author(s):  
Yang Zhang ◽  
Yongsheng Chen ◽  
Paul Westerhoff ◽  
John Crittenden
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Divalent Cations ◽  
The Stability

Influence of different types of natural organic matter on titania nanoparticle stability: effects of counter ion concentration and pH

2014 ◽  
Vol 1 (2) ◽  
pp. 181-189 ◽  
Author(s):  
Julián A. Gallego-Urrea ◽  
Jenny Perez Holmberg ◽  
Martin Hassellöv
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Ion Concentration ◽  
Titania Nanoparticles ◽  
Nanoparticle Stability ◽  
Counter Ion ◽  
Different Types ◽  
Titania Nanoparticle ◽  
Effects Of Ph ◽  
The Stability

Effects of pH, three natural macromolecules and three mono- and divalent electrolytes on the stability of titania nanoparticles.

Influence of Natural Organic Matter on the Fate of Cadmium During Microbial Ferrihydrite Reduction

2020 ◽  
Author(s):  
Zhe Zhou ◽  
E. Marie Muehe ◽  
Elizabeth J. Tomaszewski ◽  
Andreas Kappler ◽  
James M. Byrne
Keyword(s):  
Organic Matter ◽  
Trace Metals ◽  
Natural Organic Matter ◽  
Reduction Rate ◽  
Microbial Reduction ◽  
Geobacter Sulfurreducens ◽  
X Ray Diffraction ◽  
Reducing Conditions ◽  
Soils And Sediments ◽  
The Stability

<p>Ferrihydrite (Fh) is a short-range ordered Fe(III) oxyhydroxide which is often associated with significant amounts of trace metals in soils and sediments. Fh is frequently observed to be unstable under reducing conditions and can be transformed into secondary Fe minerals, during which associated trace metals are either redistributed in the minerals or released into solution. Natural organic matter (NOM), often coexisting with Fe minerals, is known to alter the transformation pathways of Fh, however, its effect on associated trace metals is not well known. Here we investigated how cadmium (Cd) is redistributed when Fh undergoes microbial Fe(III) reduction in the presence of NOM. Incubation with the Fe(III)-reducing bacteria Geobacter sulfurreducens showed that the rate and extent of reduction of Cd-loaded Fh were enhanced by increasing concentrations of NOM (i.e. increasing C/Fe ratio). Under low C/Fe ratios, only 3-5% of Fe(III) was reduced, but around 70% of pre-adsorbed Cd was released into the aqueous phase due to Fh transformation to lepidocrocite. At high C/Fe ratio (1.6), the Fe(III) reduction rate in the first 6 hours became nearly 3 times faster than in the absence of NOM, and more than 35% of Fe(III) was reduced over 5 days, possibly because the adsorbed NOM decreased the size of aggregates and the residual NOM in solution worked as electron shuttle. No Fh transformation was observed (using Mössbauer spectroscopy or X-ray diffraction) suggesting NOM could impede Fh crystal growth, and there was only negligible Cd release into solution. Lower concentrations of aqueous Cd lowered the metal's toxicity toward Geobacter sulfurreducens thus enabling more prolonged microbial reduction. The negligible Cd released during microbial Fh reduction might be due to recapture of Cd (initially bound to Fh) by NOM adsorbed on Fh. In summary, our study suggests the presence of NOM can be beneficial for the stability of Cd adsorbed to Fh under reducing conditions.</p>

Sign in / Sign up

Export Citation Format

Share Document