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Preparation and characterization of thermally stable cellulose nanocrystals via a sustainable approach of FeCl3-catalyzed formic acid hydrolysis

Author:
Du, Haishun, Liu, Chao, Mu, Xindong, Gong, Wenbo, Lv, Dong, Hong, Yimei, Si, Chuanling, Li, Bin
Source:
Cellulose 2016 v.23 no.4 pp. 2389-2407
ISSN:
0969-0239
Subject:
Eucalyptus, acid hydrolysis, cellulose, crystal structure, dimethyl sulfoxide, dispersibility, economic feasibility, ferric chloride, ferric hydroxide, formic acid, kraft pulp, nanocrystals, particle size, sulfuric acid, temperature, thermal stability, thermogravimetry, value-added products
Abstract:
Cellulose nanocrystals (CNCs) can be used as building blocks for the production of many renewable and sustainable nanomaterials. In this work, CNCs were produced from bleached eucalyptus kraft pulp with a high yield over 75 % via FeCl₃-catalyzed formic acid (FA) hydrolysis process. It was found that the particle size of resultant CNC products (F-CNC) decreased with the increase of FeCl₃ dosage in FA hydrolysis, and a maximum crystallinity index of about 75 % could be achieved when the dose of FeCl₃ was 0.015 M (i.e. about 7 % based on the weight of starting material). Thermogravimetric analyses revealed that F-CNC exhibited a much higher thermal stability (the decomposition temperature was over 260 °C) than S-CNC prepared by typical sulfuric acid hydrolysis. In the FeCl₃-catalyzed FA hydrolysis process, FA could be easily recovered and reused, and FeCl₃ could be transferred to Fe(OH)₃ as a high value-added product. Thus, the FeCl₃-catalyzed FA hydrolysis process could be sustainable and economically feasible. In addition, F-CNC could be well dispersed in DMSO and its dispersibility in water could be improved by a cationic surface modification.
Agid:
5373168