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Encapsulation of iron nanoparticles in alginate biopolymer for trichloroethylene remediation

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Abstract

Nanoscale zero-valent iron (NZVI) particles (10–90 nm) were encapsulated in biodegradable calcium-alginate capsules for the first time for application in environmental remediation. Encapsulation is expected to offers distinct advances over entrapment. Trichloroethylene (TCE) degradation was 89–91% in 2 h, and the reaction followed pseudo first order kinetics for encapsulated NZVI systems with an observed reaction rate constant (k obs) of 1.92–3.23 × 10−2 min−1 and a surface normalized reaction rate constant (k sa) of 1.02–1.72 × 10−3 L m−2 min−1. TCE degradation reaction rates for encapsulated and bare NZVI were similar indicating no adverse affects of encapsulation on degradation kinetics. The shelf-life of encapsulated NZVI was found to be four months with little decrease in TCE removal efficiency.

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Acknowledgments

This research was supported by USGS/North Dakota Water Resources Research Institute (NDWRRI). The help from the members (especially Mr. Harjyoti Kalita and Ms. Sita Krajangpan) of Nanoenvirology Research Group (NRG) and Environmental Engineering Laboratory of North Dakota State University is thankfully acknowledged.

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Authors and Affiliations

  1. Nanoenvirology Research Group (NRG), North Dakota State University, Fargo, ND, 58108, USA

    Achintya N. Bezbaruah & Sai Sharanya Shanbhogue

  2. Department of Civil Engineering, North Dakota State University, Fargo, ND, 58108, USA

    Achintya N. Bezbaruah, Sai Sharanya Shanbhogue & Eakalak Khan

  3. Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108, USA

    Senay Simsek

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  1. Achintya N. Bezbaruah
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  2. Sai Sharanya Shanbhogue
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  3. Senay Simsek
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  4. Eakalak Khan
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Correspondence to Achintya N. Bezbaruah.

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Bezbaruah, A.N., Shanbhogue, S.S., Simsek, S. et al. Encapsulation of iron nanoparticles in alginate biopolymer for trichloroethylene remediation. J Nanopart Res 13, 6673–6681 (2011). https://doi.org/10.1007/s11051-011-0574-x

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  • DOI: https://doi.org/10.1007/s11051-011-0574-x

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