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A More Efficient Fenton Oxidation Method with High Shear Mixing for the Preparation of Cellulose Nanofibers
Author(s) -
Duan Linjuan,
Liu Rongrong,
Li Qun
Publication year - 2020
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201900259
Subject(s) - cellulose , hydrogen peroxide , oxidized cellulose , chemical engineering , nanofiber , kraft process , materials science , radical , cellulose fiber , chemistry , kraft paper , peroxide , polymer chemistry , composite material , organic chemistry , engineering
Abstract A more efficient Fenton oxidation method with high shear mixing for the preparation of cellulose nanofiber (CNF) is investigated. The Fenton reaction is the reaction between Fe 2+ and H 2 O 2 to produce a series of free radicals that leads to oxidation of the cellulose. With the new technology, the Fe 2+ is preloaded into the kraft pulp by a high shear refining method to realize in situ oxidation of cellulose fibers. It is found that the carbonyl content in the fibers using high shear mixing process is 149.79 μmol g −1 when the dosage of hydrogen peroxide is 0.08 g/g (weight of dry fibers), compared to the 126.40 μmol g −1 of fiber without high shearing when the dosage of hydrogen peroxide is 0.15 g/g, which indicates that the new Fe 2+ pre‐loading process has higher oxidation efficiency with lower H 2 O 2 consumption compared with traditional Fe 2+ preloading process. The 13 C NMR results show that the C 2 , C 3, and C 6 hydroxyl groups are oxidized to aldehyde and carboxyl groups, which is beneficial to increase the electrostatic repulsion between fibers and facilitate the subsequent homogenization treatment. The obtained CNF is uniform in size and slightly lower in thermal stability.