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Iron Nanoparticles Coated with Amphiphilic Polysiloxane Graft Copolymers: Dispersibility and Contaminant Treatability
journal contribution
posted on 2016-02-20, 11:26 authored by Sita Krajangpan, Harjyoti Kalita, Bret J. Chisholm, Achintya N. BezbaruahAmphiphilic polysiloxane graft copolymers (APGCs) were
used as
a delivery vehicle for nanoscale zerovalent iron (NZVI). The APGCs
were designed to enable adsorption onto NZVI surfaces via carboxylic
acid anchoring groups and polyethylene glycol (PEG) grafts were used
to provide dispersibility in water. Degradation studies were conducted
with trichloroethylene (TCE) as the model contaminant. TCE degradation
rate with APGC-coated NZVI (CNZVI) was determined to be higher as
compared to bare NZVI. The surface normalized degradation rate constants, kSA (Lm2– h–1), for TCE removal by CNZVI and bare NZVI ranged from 0.008 to 0.0760
to 007–0.016, respectively. Shelf life studies conducted over
12 months to access colloidal stability and 6 months to access TCE
degradation indicated that colloidal stability and chemical reactivity
of CNZVI remained more or less unchanged. The sedimentation characteristics
of CNZVI under different ionic strength conditions (0–10 mM)
did not change significantly. The steric nature of particle stabilization
is expected to improve aquifer injection efficiency of the coated
NZVI for groundwater remediation.
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Keywords
NZVI surfacesaccess TCE degradationsedimentation characteristicssteric naturechemical reactivitydegradation rate constantsgroundwater remediationmodel contaminantparticle stabilizationiron Nanoparticles Coatedcarboxylic acid6 monthsaquifer injection efficiency12 monthsAPGCAmphiphilic Polysiloxane Graft Copolymersnanoscale zerovalent ironPEGdelivery vehicleContaminant TreatabilityAmphiphilic polysiloxane graft copolymersTCE degradation rateDegradation studiesCNZVIShelf life studiesTCE removalpolyethylene glycol
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