Journal
CELLULOSE
Volume 25, Issue 1, Pages 619-629Publisher
SPRINGER
DOI: 10.1007/s10570-017-1561-x
Keywords
Fibrillated cellulose fibers; Tert-butyl alcohol; Spider-web-like structure; Freeze-drying; Air filter
Funding
- National Science Foundation of China [31670593]
- State Key Laboratory of Pulp and Paper Engineering [201601]
- State Key Laboratory for modification of chemical fibers and polymer materials [LK1601]
- Shaanxi Province as a Whole the Innovation Project of Science and Technology Plan Projects [2016KTCQ01-87]
- Education Department of Shaanxi Provincial Government [15JF012]
- Science and Technology Department of Shaanxi Province [2015KJXX-34]
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In consideration of the healthcare issues caused by Particulate Matter (PM) pollution, developing high-performance air-filter materials especially aiming at filtering PM2.5 has attracted great attention. In this work, we fabricated a novel air filter with spider-web-like structure based on renewable and biodegradable fibrillated cellulose fibers, and demonstrated an effective strategy for network structure regulation during freeze-drying process. The results showed that the air filter with spider-web-like structure, whose filtration efficiency for model PM particles with the diameter of 300 nm could exceed 99%, was obtained from a fibrillated cellulose fiber/water/Tert-Butyl Alcohol (TBA) mixture by freeze-drying. The role of TBA in the construction of spider-web-like structure was mainly due to the following two aspects: (1) TBA molecules could promote the separation of microfibrils which acted as the cobwebs in spider-web-like structure. (2) The presence of TBA resulted in air filter transformed from lamellar porous architecture into spider-web-like structure by changing the morphologies and growth kinetics of ice-crystals. Herein, this work paves a way to fabricate high-performance air filters based on renewable materials and the pore-formation mechanism can provide a guide for structure regulation in porous materials.
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