Carbon Nanofiber Production

Life Cycle Energy Consumption and Environmental Impact

Authors

  • Vikas Khanna,

    1. Department of Chemical and Biomolecular Engineering at The Ohio State University in Columbus, Ohio
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  • Bhavik R. Bakshi,

    1. Department of Chemical and Biomolecular Engineering and codirector of the Center for Resilience at The Ohio State University
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  • L. James Lee

    1. Department of Chemical and Biomolecular Engineering and director of the National Science Foundation Center for Advanced Polymer and Composite Engineering at The Ohio State University
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Address correspondence to:
Bhavik R. Bakshi
Department of Chemical and Biomolecular Engineering
The Ohio State University
140 W., 19th Avenue
Columbus, OH 43210
bakshi.2@osu.edu
http://www.chbmeng.ohio-state.edu/~bakshi/research/

Summary

Holistic understanding of nanotechnology using systems analysis tools is essential for evaluating claims about the potential benefits of this emerging technology. This article presents one of the first assessments of the life cycle energy requirements and environmental impact of carbon nanofibers (CNFs) synthesis. Life cycle inventory data are compiled with data reported in the open literature. The results of the study indicate relatively higher life cycle energy requirements and higher environmental impact of CNFs as compared to traditional materials, like primary aluminum, steel, and polypropylene, on an equal mass basis. Life cycle energy requirements for CNFs from a range of feedstock materials are found to be 13 to 50 times that of primary aluminum on an equal mass basis. Similar trends are observed from the results of process life cycle assessment (LCA), as conveyed by different midpoint and endpoint damage indicators. Savings in life cycle energy consumption and, hence, reductions in environmental burden are envisaged if higher process yields of these fibers can be achieved in continuous operations. Since the comparison of CNFs is performed on an equal mass basis with traditional materials, these results cannot be generalized for CNF-based nanoproducts. Quantity of use of these engineered nanomaterials and resulting benefits will decide their energy and environmental impact. Nevertheless, the life cycle inventory and the results of the study can be used for evaluating the environmental performance of specific CNF-based nanoproducts.

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