Complexation of Arsenite, Arsenate, and Monothioarsenate with Oxygen-Containing Functional Groups of Natural Organic Matter: An XAS Study

2019 ◽  
Vol 53 (18) ◽  
pp. 10723-10731 ◽  
Author(s):  
Ashis Biswas ◽  
Johannes Besold ◽  
Carin Sjöstedt ◽  
Jon Petter Gustafsson ◽  
Andreas C. Scheinost ◽  
...  
Keyword(s):  
Organic Matter ◽  
Functional Groups ◽  
Natural Organic Matter

scholarly journals Ligands representing important functional groups of natural organic matter facilitate Fe redox transformations and resulting binding environments

2019 ◽  
Vol 251 ◽  
pp. 157-175 ◽  
Author(s):  
Amrita Bhattacharyya ◽  
Michael P. Schmidt ◽  
Eli Stavitski ◽  
Behrooz Azimzadeh ◽  
Carmen Enid Martínez
Keyword(s):  
Organic Matter ◽  
Functional Groups ◽  
Natural Organic Matter ◽  
Redox Transformations

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.

Determination of thiol functional groups on bacteria and natural organic matter in environmental systems

Talanta ◽  
2014 ◽  
Vol 119 ◽  
pp. 240-247 ◽  
Author(s):  
Balaji Rao ◽  
Carolyne Simpson ◽  
Hui Lin ◽  
Liyuan Liang ◽  
Baohua Gu
Keyword(s):  
Organic Matter ◽  
Functional Groups ◽  
Natural Organic Matter ◽  
Environmental Systems
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