Impact
of Sodium Humate Coating on Collector Surfaces on Deposition of Polymer-Coated
Nanoiron Particles
Version 3 2017-07-25, 21:13
Version 2 2017-07-21, 18:04
Version 1 2017-07-21, 18:03
Posted on 2017-07-25 - 21:13
The
affinity between nanoscale zerovalent iron (nano-ZVI) and mineral
surfaces hinders its mobility, and hence its delivery into contaminated
aquifers. We have tested the hypothesis that the attachment of poly(acrylic
acid)-coated nano-ZVI (PAA-nano-ZVI) to mineral surfaces could be
limited by coating such surfaces with sodium (Na) humate prior to
PAA-nano-ZVI injection. Na humate was expected to form a coating over
favorable sites for PAA-nano-ZVI attachment and hence reduce the affinity
of PAA-nano-ZVI for the collector surfaces through electrosteric repulsion
between the two interpenetrating charged polymers. Column experiments
demonstrated that a low concentration (10 mg/L) Na humate solution
in synthetic water significantly improved the mobility of PAA-nano-ZVI
within a standard sand medium. This effect was, however, reduced in
more heterogeneous natural collector media from contaminated sites,
as not an adequate amount of the collector sites favorable for PAA-nano-ZVI
attachment within these media appear to have been screened by the
Na humate. Na humate did not interact with the surfaces of acid-washed
glass beads or standard Ottawa sand, which presented less surface
heterogeneity. Important factors influencing the effectiveness of
Na humate application in improving PAA-nano-ZVI mobility include the
solution chemistry, the Na humate concentration, and the collector
properties.
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Micić, Vesna; Schmid, Doris; Bossa, Nathan; Gondikas, Andreas; Velimirovic, Milica; von der Kammer, Frank; et al. (2017). Impact
of Sodium Humate Coating on Collector Surfaces on Deposition of Polymer-Coated
Nanoiron Particles. ACS Publications. Collection. https://doi.org/10.1021/acs.est.7b01224
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AUTHORS (8)
VM
Vesna Micić
DS
Doris Schmid
NB
Nathan Bossa
AG
Andreas Gondikas
MV
Milica Velimirovic
Fv
Frank von der Kammer
MW
Mark R. Wiesner
TH
Thilo Hofmann