Transport of stabilized iron nanoparticles in porous media: Effects of surface and solution chemistry and role of adsorption

Journal of Hazardous Materials
Man ZhangXiaodi Hao

Abstract

Carboxymethyl cellulose (CMC) stabilized zero-valent iron (ZVI) (CMC-ZVI) nanoparticles have been extensively tested for remediation of soil and groundwater. This study investigated effects of iron oxide and aluminum oxide on retention and transport of CMC-ZVI nanoparticles, which have a mean hydrodynamic diameter of 155nm. Column breakthrough experiments showed that the metal oxides coatings on quartz sand greatly enhanced particle retention. A mechanistically sounder transport model was proposed by incorporating a Langmuir-type adsorption rate law into the classic convection-dispersion equation with the adsorption parameters derived from independent experiments. The model allows for a quantitative evaluation of the role of adsorption. While filtration is the primary mechanism for particle retention at lower pore velocities, adsorption becomes more significant at elevated velocities. The presence of 40-80mg-CL-1 of natural organic matter and high ionic strength (up to 200mM CaCl2) had negligible effect on the breakthrough profiles of the nanoparticles. Starch, a neutral polysugar stabilizer, was also tested as a stabilizer. Starch-stabilized ZVI nanoparticles, with a mean hydrodynamic diameter of 303nm, displayed a higher part...Continue Reading

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Citations

Jan 10, 2020·Environmental Science and Pollution Research International·Cleomar ReginattoKrishna R Reddy
Apr 27, 2021·The Science of the Total Environment·Wenpei WuMengfang Chen
Jun 26, 2021·Environmental Science & Technology·Ariel Nunez GarciaDenis M O'Carroll
Jun 15, 2018·Environmental Science & Technology·Meirav Cohen, Noam Weisbrod
Jul 9, 2020·ACS Applied Materials & Interfaces·Miroslav BrumovskýRadek Zbořil
Jan 20, 2020·The Science of the Total Environment·Yingna XingXijuan Chen

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