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| Preparation of CNC by Combining LPMO Prehydrolysis with Sulfuric Acid Hydrolysis |
| Received:August 20, 2021 |
| DOI：10.11980/j.issn.0254-508X.2021.11.007 |
| Key Words:cellulose nanocrystal lytic polysaccharide monooxy-genase sulfuric acid hydrolysis preparation |
| Fund Project:大学生创新训练计划项目（202010057231）。 |
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| Abstract:The LPMO prehydrolysis combined with sulfuric acid hydrolysis was used to prepare cellulose nanocrystal （CNC） in this study. The micro morphology of cellulose pretreated before and after LPMO prehydrolysis was studied. The particle size， crystallinity， and micro morphology of the as-prepared CNC and the CNC prepared by only sulfuric acid hydrolysis were characterized and compared. The results showed that when the mass fraction of sulfuric acid was 60%， average particle size of the CNC pretreated by LPMO decreased by 22 nm， while the crystallinity and yield of which increased by 8.8 percentage points and 19.3 percentage points， respectively. After LPMO prehydrolysis， with the decrease of the sulfuric acid mass fraction， the yield of CNC and the total amount of carboxyl sulfonic group decreased， the particle size increased， while the crystallinity showed no correlation with it. It was found that the particle size of CNC prepared by LPMO prehydrolysis combining sulfuric acid hydrolysis （mass fraction of 50%） increased by 9 nm compared with the control group， the total amount of carboxyl sulfonic group of which was smaller， while the crystallinity and yield increased by 6.4 percentage points and 18.4 percentage points， respectively. The AFM characterization of which confirmed its nanoscale. Therefore， desirable CNC could be prepared by LPMO prehydrolysis combining 50% sulfuric acid， which would fit the using requirement of more equipment. However， the reaction period of LPMO is long， which needs to be further studied in practical industrial application. |
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