TY - GEN
T1 - Reactivity of zerovalent metals in aquatic media
T2 - Effects of organic surface coatings
AU - Tratnyek, Paul G.
AU - Salter-Blanc, Alexandra J.
AU - Nurmi, James T.
AU - Amonette, James E.
AU - Liu, Juan
AU - Wang, Chongmin
AU - Dohnalkova, Alice
AU - Baer, Donald R.
PY - 2011
Y1 - 2011
N2 - Granular, reactive zerovalent metals (ZVMs)-especially iron (ZVI)-form the basis for model systems that have been used in fundamental and applied studies of a wide variety of environmental processes. This has resulted in notable advances in many areas, including the kinetics and mechanisms of contaminant reduction reactions, theory of filtration and transport of colloids in porous media, and modeling of complex reactive-transport scenarios. Recent emphasis on nano-sized ZVI has created a new opportunity: to advance the understanding of how coatings of organic polyelectrolytes-like natural organic matter (NOM)-influence the reactivity of environmental surfaces. Depending on many factors, organic coatings can be activating or passivating with respect to redox reactions at particle-solution interfaces. In this study, we show the effects of organic coatings on nZVI vary with a number of factors including: (i) time (i.e., "aging" is evident not only in the structure and composition of the nZVI but also in the interactions between nZVI and NOM) and (ii) the type of organic matter (i.e., suspensions of nZVI are stabilized by NOM and the model polyelectrolyte carboxymethylcellulose (CMC), but NOM stimulates redox reactions involving nZVI while CMC inhibits them).
AB - Granular, reactive zerovalent metals (ZVMs)-especially iron (ZVI)-form the basis for model systems that have been used in fundamental and applied studies of a wide variety of environmental processes. This has resulted in notable advances in many areas, including the kinetics and mechanisms of contaminant reduction reactions, theory of filtration and transport of colloids in porous media, and modeling of complex reactive-transport scenarios. Recent emphasis on nano-sized ZVI has created a new opportunity: to advance the understanding of how coatings of organic polyelectrolytes-like natural organic matter (NOM)-influence the reactivity of environmental surfaces. Depending on many factors, organic coatings can be activating or passivating with respect to redox reactions at particle-solution interfaces. In this study, we show the effects of organic coatings on nZVI vary with a number of factors including: (i) time (i.e., "aging" is evident not only in the structure and composition of the nZVI but also in the interactions between nZVI and NOM) and (ii) the type of organic matter (i.e., suspensions of nZVI are stabilized by NOM and the model polyelectrolyte carboxymethylcellulose (CMC), but NOM stimulates redox reactions involving nZVI while CMC inhibits them).
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U2 - 10.1021/bk-2011-1071.ch018
DO - 10.1021/bk-2011-1071.ch018
M3 - Conference contribution
AN - SCOPUS:84860577927
SN - 9780841226524
T3 - ACS Symposium Series
SP - 381
EP - 406
BT - Aquatic Redox Chemistry
PB - American Chemical Society
ER -