期刊
CELLULOSE
卷 28, 期 10, 页码 6183-6199出版社
SPRINGER
DOI: 10.1007/s10570-021-03914-7
关键词
Acidic deep eutectic solvent hydrolysis; Cellulose nanocrystals; Choline chloride; Oxalic acid; Sulphuric acid hydrolysis
资金
- Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis (UniMAP)
- Ministry of Education under Fundamental Research Grant Scheme [FRGS/1/2018/STG01/UNIMAP/03/]
This study investigates the feasibility of OA-ChCl DES as a green solvent for acidic DES hydrolysis, producing OA-ChCl DES CNC with nano-sized range and stable dispersion. The OA-ChCl DES CNC showed efficient cleavage of hydrogen bonds in pulp under acidic conditions and exhibited superior thermal stability compared to SA-CNC.
The present work aims to investigate the feasibility of oxalic acid-choline chloride deep eutectic solvent (OA-ChCl DES), which serves as a promising green solvent that utilized in the acidic deep eutectic solvent (DES) hydrolysis. Oxalic acid-choline chloride DES cellulose nanocrystal (OA-ChCl DES CNC) was isolated from the bleached DES treated pulp (BP) through the acidic DES hydrolysis using 1:1 molar ratio of OA-ChCl DES. The functional groups, crystallinity index, morphological structure, particle size, zeta potential, thermal stability and surface chemistry of the OA-ChCl DES CNC were compared with the sulphuric acid cellulose nanocrystal (SA-CNC) that prepared via sulphuric acid hydrolysis. The findings revealed the presence of negatively charged carboxyl groups on OA-ChCl DES CNC surface after the acidic DES hydrolysis. The physicochemical analyses verified that the OA-ChCl DES CNC was in nano-sized range with polydispersity index (PdI) of 0.56, indicating slightly monodispersed nanoparticles. A stable OA-ChCl DES CNC colloidal suspension with zeta potential value of -52.1 +/- 5.2 mV was obtained. The OA-ChCl DES CNC outweighed the SA-CNC in term of thermal stability (288 degrees C) despite having a slightly lower crystallinity index (76.7%). In fact, the OA-ChCl DES CNC with a yield of 55.1% was achieved through the acidic DES hydrolysis, suggesting that the OA-ChCl DES was capable of promoting efficient cleavage of strong hydrogen bonds in BP. [GRAPHICS] .
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