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Open AccessArticle

Preparation of Fibrillated Cellulose Nanofiber from Lyocell Fiber and Its Application in Air Filtration

by Jin Long 1, Min Tang 2,*, Yun Liang 1 and Jian Hu 1
1
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China
2
Department of Mechanical Engineering, University of Minnesota—Twin Cities, Minneapolis, MN 55455, USA
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1313; https://doi.org/10.3390/ma11081313
Received: 9 July 2018 / Revised: 24 July 2018 / Accepted: 27 July 2018 / Published: 29 July 2018
(This article belongs to the Special Issue Micro/Nano Materials for Clean Energy and Environment)
Ambient particulate matter less than 2.5 μm (PM2.5) can substantially degrade the performance of cars by clogging the air intake filters. The application of nanofibers in air filter paper can achieve dramatic improvement of filtration efficiency with low resistance to air flow. Cellulose nanofibers have gained increasing attention because of their biodegradability and renewability. In this work, the cellulose nanofiber was prepared by Lyocell fiber nanofibrillation via a PFI-type refiner, and the influence of applying a cellulose nanofiber on filter paper was investigated. It was found that the cellulose nanofibers obtained under 1.00 N/mm and 40,000 revolutions were mainly macrofibrils of Lyocell fiber with average fiber diameter of 0.8 µm. For the filter papers with a different nanofiber fraction, both the pressure drop and fractional efficiency increased with the higher fraction of nanofibers. The results of the figure of merit demonstrated that for particles larger than 0.05 µm, the figure of merit increased substantially with a 5% nanofiber, but decreased when the nanofiber fraction reached 10% and higher. It was concluded that the optimal fraction of the cellulose nanofiber against PM2.5 was 5%. The results of the figure of merit were related to the inhomogeneous distribution of nanofibers in the fibrous structure. The discrepancy of the theoretical and measured pressure drop showed that a higher nanofiber fraction led to a higher degree of fiber inhomogeneity. View Full-Text
Keywords: cellulose nanofiber; Lyocell fiber; PM2.5; filter paper cellulose nanofiber; Lyocell fiber; PM2.5; filter paper
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Long, J.; Tang, M.; Liang, Y.; Hu, J. Preparation of Fibrillated Cellulose Nanofiber from Lyocell Fiber and Its Application in Air Filtration. Materials 2018, 11, 1313.

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