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| Preparation of Sunflower Straw Rind Cellulose Nanofibers by TEMPO Oxidation Combined with High-pressure Homogenization |
| Received:July 13, 2024 Revised:August 06, 2024 |
| DOI：10.11981/j.issn.1000-6842.2025.02.26 |
| Key Words:sunflower stalk rind;cellulose nanofibrils;TEMPO oxidation;high pressure homogenization |
| Fund Project:自治区直属高校基本科研业务费（JY20250079）；内蒙古工业大学科研启动金（BS2025024）；自治区自然科学基金（2025MS05090）。 |
| Author Name | Affiliation | Postcode | | WANG Lizhen* | College of Light Industry and Textile， Inner Mongolia University of Technology， Hohhot， Inner Mongolia Autonomous Region， 010080
Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 | 210037 | | LI Xiaotian | College of Light Industry and Textile， Inner Mongolia University of Technology， Hohhot， Inner Mongolia Autonomous Region， 010080 | 010080 | | WANG Junyue* | Engineering Training and Teaching Department， Inner Mongolia University of Technology， Hohhot， Inner Mongolia Autonomous Region， 010080 | 010080 |
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| Abstract: |
| Using sunflower stalk rind as raw material， TEMPO/NaBr/NaClO oxidation system was used to prepare TEMPO oxidized cellulose fibers （TOCF）， and further combined with high-pressure homogenization method to obtain TEMPO oxidized cellulose nanofibrils （TOCNF）， which featured with high carboxyl content， small particle size and good dispersion stability. The products was characterized using Transmission Electron Microscopy （TEM）， Fourier Transform Infrared Spectroscopy （FT-IR）， X-ray Diffraction （XRD）， and Thermogravimetric Analysis （TGA）. The results showed that when the dosage of NaClO was 10 mmol/g， the carboxyl content of TOCF reached 1.42 mmol/g. After 8 times of high-pressure homogenization， the length and particle size of TOCNF significantly decreased， with distribution ranges of 100~250 nm and 3~7 nm， respectively. The FT-IR spectrum of TOCF showed a clear —COOH characteristic absorption peak， while TOCNF did not show any new characteristic peaks， indicating that high-pressure homogenization did not change its functional groups. Both TOCF and TOCNF retained the type I crystalline structure of cellulose， but compared with sunflower stalk rind holocellulose， the crystallinity and thermal stability of TOCF and TOCNF had decreased. |
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