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

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+.

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

Removal of Humic Substances by Coagulation

1999 ◽  
Vol 40 (9) ◽  
pp. 47-54 ◽  
Author(s):  
C.R. O’Melia ◽  
W.C. Becker ◽  
K.-K. Au
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Complex Formation ◽  
Natural Organic Matter ◽  
Divalent Cations ◽  
Water Source ◽  
Quality Characteristic ◽  
Oxide Surfaces ◽  
Water Quality Characteristic ◽  
Coagulant Dosage

Measurements and modeling of the adsorption of natural organic matter (NOM) on oxide surfaces are presented and compared. Agreement is good and supports the view that the adsorption of NOM on oxides depends significantly on complex formation reactions between specific sites on oxide surfaces and functional groups on the NOM. Coagulant requirements can and often are set by the total organic carbon (TOC) concentration in a water source. Frequently there is a stoichiometric relationship between the required coagulant dosage and the TOC of the water to be treated. Other important factors include pH and the concentration of divalent cations. Ozone may benefit or retard coagulation, depending on coagulant type and the water quality characteristic that is dominant in setting the optimum coagulant dose.

Role of Divalent Cations on Deposition ofCryptosporidium parvumOocysts on Natural Organic Matter Surfaces

2010 ◽  
Vol 44 (12) ◽  
pp. 4519-4524 ◽  
Author(s):  
Dao Janjaroen ◽  
Yuanyuan Liu ◽  
Mark S. Kuhlenschmidt ◽  
Theresa B. Kuhlenschmidt ◽  
Thanh H. Nguyen
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Divalent Cations

Aggregation and Stability of Reduced Graphene Oxide: Complex Roles of Divalent Cations, pH, and Natural Organic Matter

2015 ◽  
Vol 49 (18) ◽  
pp. 10886-10893 ◽  
Author(s):  
Indranil Chowdhury ◽  
Nikhita D. Mansukhani ◽  
Linda M. Guiney ◽  
Mark C. Hersam ◽  
Dermont Bouchard
Keyword(s):  
Organic Matter ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Natural Organic Matter ◽  
Divalent Cations ◽  
Reduced Graphene

Stability of nano-sized titanium dioxide in an aqueous environment: effects of pH, dissolved organic matter and divalent cations

2013 ◽  
Vol 68 (2) ◽  
pp. 276-282 ◽  
Author(s):  
X. N. Yang ◽  
F. Y. Cui
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Organic Matter ◽  
Zeta Potential ◽  
Dissolved Organic Matter ◽  
Ph Value ◽  
Divalent Cations ◽  
Aqueous Environment ◽  
Nano Tio2 ◽  
The Stability

Nano-sized titanium dioxide in the aquatic environment has a potential impact on the environment and human health. In this study, the impact of pH value, dissolved organic matter (DOM) and divalent cations (Ca2+) on the stability of titanium dioxide nanoparticles (nano-TiO2) in an aqueous environment was investigated in batch tests. The results showed that the particle size of nano-TiO2 was not sensitive to pH value but was inversely proportional to zeta potential. The nano-TiO2 becomes more stable with surface zeta potential, accompanied by small particle size and high dispersion. In the presence of DOM, the particle size was smaller and the stability of nano-TiO2 could be enhanced. This might be a synergistic effect of the ligand exchange and electrostatic force. Particle size increased with the addition of Ca2+ and the stability decreased.

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
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