Straining of polyelectrolyte-stabilized nanoscale zero valent iron particles during transport through granular porous media

Water Research
Trishikhi RaychoudhurySubhasis Ghoshal

Abstract

In this study, the relevance of straining of nano-sized particles of zero valent iron coated with carboxymethyl cellulose (CMC-NZVI) during transport in model subsurface porous media is assessed. Although deposition of polyelectrolyte stabilized-NZVI on granular subsurface media due to physicochemical attachment processes has been reported previously, there is limited knowledge on the significance of the collector (sand) diameter on the deposition and spatial distribution of the retention of such nanoparticles. Experiments were conducted to assess the transport of CMC-NZVI in columns packed with four different-sized sands of mean diameter of 775 μm, 510 μm, 250 μm and 150 μm and at three different particle concentrations of 0.085 g L(-1), 0.35 g L(-1) and 1.70 g L(-1). CMC-NZVI effluent concentrations decreased with smaller sand diameters. High CMC-NZVI particle retention near the inlet, particularly for the finer sands was observed, even with a low ionic strength of 0.1 mM for the electrolyte medium. These observations are consistent with particle retention in porous media due to straining and/or wedging. Two colloid transport models, one considering particle retention by physicochemical deposition and detachment of those depo...Continue Reading

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Dec 2, 2014·Journal of Contaminant Hydrology·Amir TaghavyLinda M Abriola
Feb 11, 2016·Journal of Hazardous Materials·Shaolin LiWei-Xian Zhang
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Sep 20, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Chongyang ShenBaoguo Li
Aug 17, 2021·Journal of Colloid and Interface Science·Vinicius BuenoSubhasis Ghoshal

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