Extraction and Isolation of Cellulose Nanofibers from Carpet Wastes Using Supercritical Carbon Dioxide Approach

Polymers

Halimatuddahliana Nasution¹  Azmi Mohamed²  A. B. Suriani²  C. K. Abdullah³  Marwan Abdulhakim Shaah³  Tata Alfatah³  Esam Bashir Yahya³  H. P. S. Abdul Khalil³ 

[1] Department of Chemical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Medan 20155, Indonesia;Nanotechnology Research Centre, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris (UPSI), Tanjung Malim 35900, Perak, Malaysia;School of Industrial Technology, Universiti Sains Malaysia, Penang 11800, Malaysia;

关键词: cellulose nanofibers isolation;    carpet wastes;    supercritical carbon dioxide;    enhanced properties;   

DOI  :  10.3390/polym14020326

来源: DOAJ

【 摘 要 】

Cellulose nanofibers (CNFs) are the most advanced bio-nanomaterial utilized in various applications due to their unique physical and structural properties, renewability, biodegradability, and biocompatibility. It has been isolated from diverse sources including plants as well as textile wastes using different isolation techniques, such as acid hydrolysis, high-intensity ultrasonication, and steam explosion process. Here, we planned to extract and isolate CNFs from carpet wastes using a supercritical carbon dioxide (Sc.CO₂) treatment approach. The mechanism of defibrillation and defragmentation caused by Sc.CO₂ treatment was also explained. The morphological analysis of bleached fibers showed that Sc.CO₂ treatment induced several longitudinal fractions along with each fiber due to the supercritical condition of temperature and pressure. Such conditions removed th fiber’s impurities and produced more fragile fibers compared to untreated samples. The particle size analysis and Transmission Electron Microscopes (TEM) confirm the effect of Sc.CO₂ treatment. The average fiber length and diameter of Sc.CO₂ treated CNFs were 53.72 and 7.14 nm, respectively. In comparison, untreated samples had longer fiber length and diameter (302.87 and 97.93 nm). The Sc.CO₂-treated CNFs also had significantly higher thermal stability by more than 27% and zeta potential value of −38.9± 5.1 mV, compared to untreated CNFs (−33.1 ± 3.0 mV). The vibrational band frequency and chemical composition analysis data confirm the presence of cellulose function groups without any contamination with lignin and hemicellulose. The Sc.CO₂ treatment method is a green approach for enhancing the isolation yield of CNFs from carpet wastes and produce better quality nanocellulose for advanced applications.

【 授权许可】

Unknown