The preparation of lignin nanoparticles: Comparison between homogenization and ultrasonication treatments following anti-solvent precipitation method

The combination of the anti-solvent precipitation method with mechanical treatments in the production of lignin nanoparticles (LNP) has been performed in several studies. However, literature explaining the effect of different mechanical treatments on the properties of the obtained nanoparticles is s...

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Bibliographic Details
Main Authors: Aryana, Nurhani, Krismastuti, Fransiska Sri Herwahyu, Arutanti, Osi, Restu, Witta Kartika
Format: Conference Proceeding
Language:English
Subjects:
Aqueous solutions
Homogenization
Lignin
Nanoparticles
Pore size
Reproducibility
Room temperature
Solvents
Surface charge
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Summary:The combination of the anti-solvent precipitation method with mechanical treatments in the production of lignin nanoparticles (LNP) has been performed in several studies. However, literature explaining the effect of different mechanical treatments on the properties of the obtained nanoparticles is still lacking. In this work, two mechanical treatments, namely, homogenization at 12,000 rpm and ultrasonication at 600 W, were carried out after the anti-solvent precipitation method, and their influences on the properties of the obtained LNP were compared. Alkali lignin was used as the starting lignin. The anti-solvent precipitation method was performed by using acetone/water with a ratio of 7:3 as the lignin solvent and water as the anti-solvent. Subsequently, two different mechanical treatments were applied to the resulting solution for 10 min, respectively. The results showed that the ultrasonication treatment after the anti-solvent precipitation method yields LNP with a more negative surface charge (-36.6±0.4 mV) than the homogenization treatment. As the consequence, these LNP have better stability in aqueous solution at room temperature for 3 months. In addition, the ultrasonication treatment generates a higher surface area, small pore size and pore volume, and repeatable and reproducible advantages. The current research showed that this method could effectively control the physicochemical properties of LNP so that it can be adapted to broad applications such as sensors, biocatalysts, and nano-adsorbent in further research.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0172942