Transport, co-transport, and retention of functionalized multi-walled carbon nanotubes in porous media

Transport, co-transport, and retention of functionalized multi-walled carbon nanotubes in porous media
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Inhaltsangabe zu "Transport, co-transport, and retention of functionalized multi-walled carbon nanotubes in porous media"

The information on transport and retention behavior of functionalized multiwalled
carbon nanotubes (MWCNTs) in porous media is essential for environmental
protection and remediation due to the wide applications of MWCNTs and lack of
disposal regulations. The aim of this study is therefore to investigate: i) the attachment,
transport, retention and remobilization of 14C-labeled functionalized MWCNTs in
different porous media (quartz sand (QS), goethite-coated quartz sand (GQS), and
soil), ii) co-transport of pollutants (chlordecone (CLD) and sulfadiazine (SDZ)) by
MWCNTs, and iii) the role of surfactant on MWCNTs transport as a modeled soil
remediation process, based on column and batch experiments at the environmentally
relevant concentrations under various physiochemical conditions. The breakthrough
curves (BTCs) and retention profiles (RPs) were determined and simulated based on
advective- dispersive equation by using different numerical models that considered
both time- and depth- dependent blocking functions.
The effect of goethite coating on MWCNTs transport was conducted in
mixtures of negatively charged QS and positively charged GQS. The linear
equilibrium sorption model provided a good description of batch results, and the
distribution coefficients (KD) drastically increased with the GQS fraction that was
electrostatically favorable for retention. Similarly, retention of MWCNTs increased
with the GQS fraction in packed column experiments. However, calculated values of
KD on GQS were around two orders of magnitude smaller in batch than packed
column experiments due to differences in lever arms associated with hydrodynamic
and adhesive torques at microscopic roughness locations. Furthermore, the fraction of
the chemically heterogeneous sand surface area that was favorable for retention was
much smaller than the GQS fraction, presumably because nanoscale roughness
produced shallow interactions that were susceptible to removal. These observations
indicated that only a minor fraction of the GQS was favorable for MWCNT retention.
These same observations held for several different sand sizes....

Buchdetails

Aktuelle Ausgabe
ISBN:9783958061989
Sprache:Englisch
Ausgabe:Flexibler Einband
Umfang:0 Seiten
Verlag:Forschungszentrum Jülich
Erscheinungsdatum:28.03.2017

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