Scholarlink

<p>The demand for sustainable alternatives such as cellulose nanofibers has become increasingly significant due to growing ecological and environmental problems driven on by the depletion of natural resources, growing expenses, and the negative consequences of conventional materials. The isolation of cellulose nanofibers (CNFs) from agricultural biomass, such as rice straw presents a viable way to address environmental issues, particularly those associated with the burning of rice straw. Nonetheless, there is still a need to develop novel, eco-friendly, energy-efficient methods for the isolation of CNFs that require minimal chemical usage and less processing time. In this research work, CNFs were successfully isolated from rice straw through a high-intensity ultrasonication process coupled with high shear dispersion. Prior to CNFs preparation, cellulose fibers were extracted through chemical treatments including alkaline and bleaching treatments to effectively remove non-cellulosic components (hemicellulose, lignin) and enhance cellulose accessibility. Morphological analysis identified the successful defibrillation and presence of individualized cellulose nanofibers, forming interconnected networks with an average diameter of 34.2&#xa0;nm and an aspect ratio of 51.3. Fourier transform infrared spectroscopy (FTIR) analysis validated the successful removal of hemicellulose and lignin while retaining cellulose in the nanofibers. X-ray diffraction (XRD) analysis revealed that crystallinity increased from 68% in chemically isolated cellulose fibers to 80.2% in CNFs due to the effective elimination of non-crystalline parts and improved alignment of cellulose chains. Thermogravimetric analysis (TGA) indicated good thermal stability of CNFs with a maximum degradation temperature of 329&#xa0;°C. The zeta potential of − 12&#xa0;mV suggested moderate stability that enhanced dispersion and prevented aggregation of CNFs. The polydispersity index (PDI) of the synthesized CNFs was determined to be 0.3, indicating a relatively narrow size distribution and uniformity in fiber dimension. Thus, the isolation of cellulose nanofibers through a combined high-shear dispersion and ultrasonication offers a sustainable approach to valorize underutilized biomass to produce eco-friendly nanomaterial with high crystallinity, good thermal properties, and enhanced stability. These properties make rice straw-derived CNFs a highly suitable biodegradable reinforcing agent to be utilized in food packaging, composite materials, and other domains of sustainable material science.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Isolation and characterization of cellulose nanofibers from rice straw using ultrasonication-assisted extraction technique coupled with high shear dispersion

  • 期刊论文

  • 发表日期：

    2025年3月14日

查看全文
  • Sadhana Jadaun,
  • Neelam Upadhyay,
  • Saleem Siddiqui

摘要

The demand for sustainable alternatives such as cellulose nanofibers has become increasingly significant due to growing ecological and environmental problems driven on by the depletion of natural resources, growing expenses, and the negative consequences of conventional materials. The isolation of cellulose nanofibers (CNFs) from agricultural biomass, such as rice straw presents a viable way to address environmental issues, particularly those associated with the burning of rice straw. Nonetheless, there is still a need to develop novel, eco-friendly, energy-efficient methods for the isolation of CNFs that require minimal chemical usage and less processing time. In this research work, CNFs were successfully isolated from rice straw through a high-intensity ultrasonication process coupled with high shear dispersion. Prior to CNFs preparation, cellulose fibers were extracted through chemical treatments including alkaline and bleaching treatments to effectively remove non-cellulosic components (hemicellulose, lignin) and enhance cellulose accessibility. Morphological analysis identified the successful defibrillation and presence of individualized cellulose nanofibers, forming interconnected networks with an average diameter of 34.2 nm and an aspect ratio of 51.3. Fourier transform infrared spectroscopy (FTIR) analysis validated the successful removal of hemicellulose and lignin while retaining cellulose in the nanofibers. X-ray diffraction (XRD) analysis revealed that crystallinity increased from 68% in chemically isolated cellulose fibers to 80.2% in CNFs due to the effective elimination of non-crystalline parts and improved alignment of cellulose chains. Thermogravimetric analysis (TGA) indicated good thermal stability of CNFs with a maximum degradation temperature of 329 °C. The zeta potential of − 12 mV suggested moderate stability that enhanced dispersion and prevented aggregation of CNFs. The polydispersity index (PDI) of the synthesized CNFs was determined to be 0.3, indicating a relatively narrow size distribution and uniformity in fiber dimension. Thus, the isolation of cellulose nanofibers through a combined high-shear dispersion and ultrasonication offers a sustainable approach to valorize underutilized biomass to produce eco-friendly nanomaterial with high crystallinity, good thermal properties, and enhanced stability. These properties make rice straw-derived CNFs a highly suitable biodegradable reinforcing agent to be utilized in food packaging, composite materials, and other domains of sustainable material science.

Graphical Abstract