Synthesis of iron nanoparticles with poly(1-vinylpyrrolidone-co-vinyl acetate) and its application to nitrate reduction

Nara Lee, Kyunghoon Choi, Basil Uthuppu, Mogens Havsteen Jakobsen, Yuhoon Hwang, Mette Martina Broholm, Woojin Lee

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study aimed to synthesize dispersed and reactive nanoscale zero-valent iron (nZVI) with poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA), nontoxic and biodegradable stabilizer. The nZVI used for the experiments was prepared by reduction of ferric solution in the presence of PVP/VA with specific weight ratios to iron contents. Colloidal stability was investigated based on the rate of sedimentation, hydrodynamic radius and zeta potential measurement. The characteristic time, which demonstrated
dispersivity of particles resisting aggregation, increased from 21.2 min (bare nZVI) to 97.8 min with increasing amount of PVP/VA (the ratios of 2). For the most stable nZVI coated by PVP/VA, its reactivity was examined by nitrate reduction in a closed batch system. The pseudo-first-order kinetic rate constants for the nitrate reduction by the nanoparticles with PVP/VA ratios of 0 and 2 were 0.1633 and 0.1395 min-1 respectively. A nitrogen mass balance, established by quantitative analys is of aqueous nitrogen species, showed that the addition of PVP/VA to nZVI can change the reduction capacity of the nanoparticles.
Original languageEnglish
Book seriesAdvances in Environmental Research
Volume3
Issue number2
Pages (from-to)107-116
Number of pages10
ISSN2158-5717
DOIs
Publication statusPublished - 2014

Keywords

  • Poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA)
  • Nanoscale zero-valent iron (nZVI)
  • Colloidal stability
  • Nitrate reduction

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