期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 122, 期 -, 页码 410-416出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2018.10.187
关键词
Cellulose nanocrystals; Pineapple crown waste; Mercerizing; Bleaching; Acid hydrolysis
资金
- Sao Paulo Research Foundation, FAPESP [2010/17804-7, 2011/00156-5]
- National Council for Scientific and Technological Development, CNPq [310410/2010-0, 478168/2011-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/00156-5] Funding Source: FAPESP
Pineapple crown is an important source of cellulose that is still going to waste because of the lack of knowledge about their economic uses. The isolation of cellulose nanocrystals (CNC) from pineapple crown leaf (PCL) wastes arises as an important alternative to use PCL wastes in high value-added applications, and has not been reported yet. In this study, CNC were successfully extracted from PCL wastes using chemical treatments followed by acid hydrolysis using sulfuric acid. FTIR results confirmed the removal of the non-cellulosic compounds of PCL through the mercerization and bleaching treatments. SEM and AFM showed that the diameter of PCL fibers was reduced from 18 pm to 39 nm after the hydrolysis reaction, resulting in CNC with rod-like shape. The obtained CNC showed cellulose I crystalline structure with high crystallinity index (73%). The thermal degradation of CNC started at 124 degrees C, what was attributed to the presence of surface sulfate groups identified by elemental analysis. The high hydrophilicity of CNC was verified by its high moisture content and absorption. The results showed that the CNC isolated from PCL have interesting properties to be used in many liquid media applications, besides their use as reinforcement in nanocomposites. (C) 2018 Elsevier B.V. All rights reserved.
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