2, Nazarbayev University, Astana, , Kazakhstan
Trichloroethylene (TCE) is one of the most frequently found toxic, carcinogenic, and mutagenic chlorinated organic compounds in contaminated soil and groundwater systems. The reductive dechlorination of TCE using nanoscale zero-valent iron (NZVI) represents an economical approach for the remediation. However, the dispersion of bare NZVI is poor in aqueous and groundwater conditions. The coating of NZVI with polymers has been shown to enhance their colloidal dispersion. However, the reactivity of polymer stabilized NZVI is much lower than that of NZVI, due to decreased reactive surface of the particles by the coated polymer. This can significantly diminish reductive degradation of TCE, leading to incomplete degradation of TCE and formation of much more toxic products. In the study, we synthesized newly-developed PVP stabilized NZVI-metal nanoparticles. The nanoparticles could reactively transform TCE to ethane with significantly enhanced dechlorination kinetics and mobility. We observed a rapid and complete degradation of TCE without leaching of surface metals during repeated runs. The nanoparticles could be potentially applied to a sustainable remediation of the sites contaminated by chlorinated hydrocarbons with enhanced reactivity, mobility, stability, and durability.