Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 340, Issue -, Pages 399-406Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.07.030
Keywords
Reductive dechlorination; Nano zerovalent iron (nZVl); Polyvinylpyrrolidone; Trichloroethylene; Bimetallic nZVI-Ni
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Funding
- Korean Ministry of Environment [RE201402059]
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We developed a novel stabilized nanoscale zerovalent iron (NZVI) particles with Ni using an electron conducting polymer, polyvinylpyrrolidone (PVP), to selectively dechlorinate trichloroethylene (TCE) to non-toxic intermediates. The size of the PVP stabilized NZVI-Ni ((PVP-NZVI-Ni), average diameter: similar to 20nm) is smaller than that of bare NZVI (50-80nm) due to the prevention of agglomeration of the resultant iron particles by PVP. PVP-NZVI-Ni showed a complete removal of TCE in 1 h with superior dechlorination kinetics (k(obs) =5.702 h(-1)) and ethane selectivity (98%), while NZVI-Ni showed 5 times slower dechlorination kinetics (1.218 h(-1)). Other PVP-NZVI-metals (i.e., Cu, Sn, Co, and Mn) also enhanced the TCE dechlorination, but they were much slower (k(obs) =0.024-0.411 h(-1)) than that of PVP-NZVI-Ni. In column test, PVP-NZVI-Ni exhibited better mobility (95% of PVP-NZVI-Ni recovery in the eluent) than NZVI-Ni (1%). In addition, PVP-NZVI-Ni reductively transform TCE to ethane even under 10 cycles of repeated TCE dechlorination treatment. (C) 2017 Elsevier B.V. All rights reserved.
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