Harmonized Life-Cycle Inventories of Nanocellulose and Its Application in Composites

Cellulose nanocrystals (CNC) and nanofibers (CNF) have been broadly studied as renewable nanomaterials for various applications, including additives in cement and plastics composites. Herein, life cycle inventories for 18 previously examined processes are harmonized, and the impacts of CNC and CNF p...

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Bibliographic Details
Published in:Environmental science & technology 2023-12, Vol.57 (48), p.19137-19147
Main Authors: Kane, Seth, Miller, Sabbie A, Kurtis, Kimberly E, Youngblood, Jeffrey P, Landis, Eric N, Weiss, W Jason
Format: Article
Language:English
Subjects:
Additives
Carbon dioxide
Cellulose
Cellulose - chemistry
Cement
Composite materials
Emissions
Energy consumption
Greenhouse gases
Inventories
Life cycles
Nanofibers - chemistry
Nanomaterials
Nanoparticles - chemistry
Nanostructures
Nanotechnology
Polylactic acid
Portland cement
Portland cements
Production methods
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Summary:Cellulose nanocrystals (CNC) and nanofibers (CNF) have been broadly studied as renewable nanomaterials for various applications, including additives in cement and plastics composites. Herein, life cycle inventories for 18 previously examined processes are harmonized, and the impacts of CNC and CNF production are compared with a particular focus on GHG emissions. Findings show wide variations in GHG emissions between process designs, from 1.8-1100 kg CO -eq/kg nanocellulose. Mechanical and enzymatic processes are identified as the lowest GHG emission methods to produce CNCs and CNFs. For most processes, energy consumption and chemical use are the primary sources of emissions. However, on a mass basis, for all examined production methods and impact categories (except CO emissions), CNC and CNF production emissions are higher than Portland cement and, in most cases, are higher than polylactic acid. This work highlights the need to carefully consider process design to prevent potential high emissions from CNCs and CNF production despite their renewable feedstock, and results show the magnitude of conventional material that must be offset through improved performance for these materials to be environmentally favorable.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.3c04814