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Stabilization Of Fe−Pd Nanoparticles With Sodium Carboxymethyl Cellulose For Enhanced Transport And Dechlorination Of Trichloroethylene In Soil And Groundwater

F. He, Dongye Zhao, Juncheng Liu, C. Roberts
Published 2007 · Chemistry

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This study reports a new strategy for stabilizing palladized iron (Fe−Pd) nanoparticles with sodium carboxymethyl cellulose (CMC) as a stabilizer. Compared to nonstabilized Fe−Pd particles, the CMC-stabilized nanoparticles displayed markedly improved stability against aggregation, chemical reactivity, and soil transport. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analyses indicated that the CMC-stabilized nanoparticles with a diameter <17.2 nm are highly dispersed in water. Fourier transform infrared (FTIR) spectroscopy results suggested that CMC molecules were adsorbed to iron nanoparticles primarily through the carboxylate groups through monodentate complexation. In addition, −OH groups in CMC were also involved in interactions with iron particles. Batch dechlorination tests demonstrated that the CMC-stabilized nanoparticles degraded trichloroethene (TCE) 17 times faster than their nonstabilized counterparts based on the initial pseudo-first-order rate constant. Last, colu...
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