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Dispersant-modified iron nanoparticles for mobility enhancement and TCE degradation: a comparison study

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Abstract

Dispersants including Tween 20, Tween 40, Tween 60, and polyacrylic acid (PAA) were used to modify nanoscale zero-valent iron (nZVI). All dispersants dispersed nZVI effectively. PAA-modified nZVI was more stable than nZVI that was modified with Tween surfactant. Iron nanoparticles that were prepared using 0.5–5.0% (vol%) of PAA remained in suspension for more than 2 h. nZVI that was modified using Tween surfactant remained in suspension for 30–60 min, and there was complete sedimentation of bare iron in 10 min. When 2.0–5.0% (vol%) of Tween surfactant was used, the stability of the nZVI that was modified using Tween 20 was much better than that for nZVI that was modified using Tween 40 or Tween 60. The results for the transportation test show that nZVI that was prepared using 2% (vol%) of Tween 20 exhibited the best mobility in porous media. Approximately 83–90% of TCE was degraded by bare, PAA-modified, and Tween 20-modified nZVI, and about 63–67% of TCE was removed by nZVI that was modified using Tween 40 and Tween 60 during 20 days of reaction. The production of cis-dichloroethene (DCE) and 1,1-DCE demonstrates that TCE is removed via reductive dechlorination. The results of this study show that PAA- and Tween 20-modified nZVI are more practical for in situ remediation because they exhibit good mobility and degrade TCE effectively.

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Authors and Affiliations

  1. Department of Environmental Science and Engineering, Tunghai University, Xitun, Taichung, 40704, Taiwan

    Yen-Ping Peng

  2. Department of Landscape Architecture, National Chin-Yi University of Technology, Taiping, Taichung, 41170, Taiwan

    Ting-Yu Chen

  3. Department of Civil Engineering, National Chi Nan University, 1 Univ. Rd, Puli, Nantou, 54561, Taiwan

    Chun-Yi Wu, Yu-Chen Chang & Ku-Fan Chen

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  1. Yen-Ping Peng
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  2. Ting-Yu Chen
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  3. Chun-Yi Wu
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  4. Yu-Chen Chang
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  5. Ku-Fan Chen
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Correspondence to Ku-Fan Chen.

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Responsible editor: Philippe Garrigues

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Peng, YP., Chen, TY., Wu, CY. et al. Dispersant-modified iron nanoparticles for mobility enhancement and TCE degradation: a comparison study. Environ Sci Pollut Res 26, 34157–34166 (2019). https://doi.org/10.1007/s11356-018-3739-7

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  • DOI: https://doi.org/10.1007/s11356-018-3739-7

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