Reductive dechlorination of trichloroethylene by polyvinylpyrrolidone stabilized nanoscale zerovalent iron particles with Ni

Macharla Arun Kumar; Sungjun Bae; Seunghee Han; Yoonseok Chang; Woojin Lee

doi:10.1016/j.jhazmat.2017.07.030

Reductive dechlorination of trichloroethylene by polyvinylpyrrolidone stabilized nanoscale zerovalent iron particles with Ni

J Hazard Mater. 2017 Oct 15:340:399-406. doi: 10.1016/j.jhazmat.2017.07.030. Epub 2017 Jul 14.

Authors

Macharla Arun Kumar¹, Sungjun Bae², Seunghee Han³, Yoonseok Chang⁴, Woojin Lee⁵

Affiliations

¹ Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
² Department of Environmental Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea.
³ School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea.
⁴ School of Environmental Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang 37673, Republic of Korea.
⁵ Department of Civil Engineering, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan. Electronic address: woojin_lee@kaist.edu.

PMID: 28735183
DOI: 10.1016/j.jhazmat.2017.07.030

Abstract

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: ∼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 1h with superior dechlorination kinetics (k_obs=5.702h^-1) and ethane selectivity (98%), while NZVI-Ni showed 5 times slower dechlorination kinetics (1.218h^-1). Other PVP-NZVI-metals (i.e., Cu, Sn, Co, and Mn) also enhanced the TCE dechlorination, but they were much slower (k_obs=0.024-0.411h^-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.

Keywords: Bimetallic nZVI-Ni; Nano zerovalent iron (nZVI); Polyvinylpyrrolidone; Reductive dechlorination; Trichloroethylene.