scholarly journals Effects of natural organic matter (NOM), metal-to-sulfide ratio and Mn2+ on cadmium sulfide nanoparticle growth and colloidal stability

2020 ◽  
Vol 7 (11) ◽  
pp. 3385-3404
Author(s):  
Kevin Hoffmann ◽  
Iso Christl ◽  
Ralf Kaegi ◽  
Ruben Kretzschmar
Keyword(s):  
Organic Matter ◽  
Crystal Lattice ◽  
Cadmium Sulfide ◽  
Natural Organic Matter ◽  
Colloidal Stability ◽  
Cds Nanoparticles ◽  
Nanoparticle Growth ◽  
Naturally Occurring

Growth of naturally occurring CdS nanoparticles is constrained by natural organic matter (NOM), which also limits the reduction of CdS colloidal stability by Mn2+ and prevents incorporation of Mn into the CdS crystal lattice.

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

scholarly journals Natural inorganic nanoparticles – formation, fate, and toxicity in the environment

2015 ◽  
Vol 44 (23) ◽  
pp. 8410-8423 ◽  
Author(s):  
Virender K. Sharma ◽  
Jan Filip ◽  
Radek Zboril ◽  
Rajender S. Varma
Keyword(s):  
Organic Matter ◽  
Metal Nanoparticles ◽  
Natural Organic Matter ◽  
Inorganic Nanoparticles ◽  
Biogeochemical Processes ◽  
Naturally Occurring

Naturally occurring metal nanoparticles are formed via physical and biogeochemical processes in the environment wherein natural organic matter plays an important role in their occurrence, stability, and toxicity.

Co-effects of UV/H2O2 and natural organic matter on the surface chemistry of cerium oxide nanoparticles

2018 ◽  
Vol 5 (10) ◽  
pp. 2382-2393 ◽  
Author(s):  
Xuanhao Wu ◽  
Chelsea W. Neil ◽  
Doyoon Kim ◽  
Haesung Jung ◽  
Young-Shin Jun
Keyword(s):  
Organic Matter ◽  
Surface Chemistry ◽  
Cerium Oxide ◽  
Natural Organic Matter ◽  
Colloidal Stability ◽  
Chemical Properties ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Surface Chemical

This study delineates the co-effects of UV/H2O2 and NOM on the colloidal stability and surface chemical properties of CeO2 nanoparticles.

scholarly journals Effect of NOM on copper sulfide nanoparticle growth, stability, and oxidative dissolution

2020 ◽  
Vol 7 (4) ◽  
pp. 1163-1178
Author(s):  
Kevin Hoffmann ◽  
Sylvain Bouchet ◽  
Iso Christl ◽  
Ralf Kaegi ◽  
Ruben Kretzschmar
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Copper Sulfide ◽  
Morphological Development ◽  
Oxidative Dissolution ◽  
Nanoparticle Growth ◽  
Growth Stability

Natural organic matter (NOM) impedes the growth of colloidally stable CuxS nanoparticles and slows down their morphological development, but also drives their oxidative dissolution.

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.

Geosmin and 2-methylisoborneol adsorption on super-powdered activated carbon in the presence of natural organic matter

2010 ◽  
Vol 62 (11) ◽  
pp. 2664-2668 ◽  
Author(s):  
Y. Matsui ◽  
Y. Nakano ◽  
H. Hiroshi ◽  
N. Ando ◽  
T. Matsushita ◽  
...  
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Surface Water ◽  
Natural Organic Matter ◽  
Powdered Activated Carbon ◽  
Severe Problem ◽  
Naturally Occurring ◽  
Adsorption Capacities ◽  
Low Efficiency ◽  
Utilities Services

Geosmin and 2-methylisoborneol (2-MIB) are naturally occurring compounds responsible for musty-earthy-odors in surface water supplies. They are a severe problem confronting utilities worldwide. Adsorption by powdered activated carbon (PAC) is a widely used process to control this problem, but it has low efficiency, which engenders large budget spending for utilities services. Super-powdered activated carbon (S-PAC) is activated carbon with much finer particles than those of PAC. Experiments on geosmin and 2-MIB adsorptions on S-PAC and PAC were conducted. Geosmin and 2-MIB adsorption capacities on S-PAC were not smaller than those on PAC although natural organic matter, which adversely impacted the adsorption capacity of geosmin and 2-MIB, was more adsorbed on S-PAC than on PAC, meaning that the adsorption competition is less severe for S-PAC than for PAC.

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