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Optimizing synthesis conditions of nanoscale zero-valent iron (nZVI) through aqueous reactivity assessment

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Abstract

Nanoscale iron particles (nZVI) is one of the most important engineered nanomaterials applied to environmental pollution control and abatement. Although a multitude of synthesis approaches have been proposed, a facile method to screen the reactivity of candidate nZVI materials produced using different methods or under varying synthesis conditions has yet been established. In this study, four reaction parameters were adjusted in the preparation of borohydride-reduced nZVI. The reductive properties of the resultant nanoparticles were assayed independently using two model aqueous contaminants, Cu (II) and nitrate. The results confirm that the reductive reactivity of nZVI is most sensitive to the initial concentration of iron precursor, borohydride feed rate, and the loading ratio of borohydride to ferric ion during particle synthesis. Solution mixing speed, in contrast, carries a relative small weight on the reactivity of nZVI. The two probing reactions (i.e., Cu(II) and nitrate reduction) are able to generate consistent and quantitative inference about the mass-normalized surface activity of nZVI. However, the nitrate assay is valid in dilute aqueous solutions only (50 mg∙L–1 or lower) due to accelerated deactivation of iron surface at elevated nitrate concentrations. Additional insights including the structural and chemical makeup of nZVI can be garnered from Cu(II) reduction assessments. The reactivity assays investigated in this study can facilitate screening of candidate materials or optimization of nZVI production parameters, which complement some of the more sophisticated but less chemically specific material characterization methods used in the nZVI research.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Texas Tech University, Lubbock, TX, 79409, USA

    Yanlai Han, Michael D. Y. Yang & Weile Yan

  2. State Key Laboratory for Pollution Control & Resources Reuse, Tongji University, Shanghai, 200092, China

    Weixian Zhang

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  1. Yanlai Han
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  2. Michael D. Y. Yang
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  3. Weixian Zhang
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Correspondence to Weile Yan.

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Han, Y., Yang, M.D.Y., Zhang, W. et al. Optimizing synthesis conditions of nanoscale zero-valent iron (nZVI) through aqueous reactivity assessment. Front. Environ. Sci. Eng. 9, 813–822 (2015). https://doi.org/10.1007/s11783-015-0784-z

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  • DOI: https://doi.org/10.1007/s11783-015-0784-z

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