Direct production of lignin nanoparticles (LNPs) from wood using p-toluenesulfonic acid in an aqueous system at 80°C: characterization of LNP morphology, size, and surface chargeAuthor(s): Qianli Ma; Liheng Chen; Ruibin Wang; Rendang Yang; J.Y. Zhu
Source: Holzforschung. 72(11): 933-942.
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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Lignin nanoparticles (LNPs) from renewable lignocelluloses can be a valuable building block for a variety of applications and could contribute to the economic development in rural agricultural communities. Current technologies for producing LNPs are not cost effective and use toxic solvents. In this study, LNPs were produced by fractionating poplar wood at ≤80°C with a recyclable hydrotrope p-toluenesulfonic acid (p-TsOH) in an aqueous system. The dissolved lignin was separated as LNPs simply by diluting the spent liquor (SL) to the minimal hydrotrope concentration (HCmin) of 11.5%. The p-TsOH, a solid acid, can be easily recycled by re-concentrating the diluted SL after lignin separation. The LNP size, morphology, and surface charge were controlled by the dilution ratio, speed, pH, and ionic strength of the LNP sol. The LNPs were analyzed by dynamic light scattering (DLS) and found to be fairly stable in terms of mean particle size and surface charge over a period of 2 weeks. Fractionation conditions also affected LNP properties.
CitationMa, Qianli; Chen, Liheng; Wang, Ruibin; Yang, Rendang; Zhu, J.Y. 2018. Direct production of lignin nanoparticles (LNPs) from wood using p-toluenesulfonic acid in an aqueous system at 80°C: characterization of LNP morphology, size, and surface charge. Holzforschung. 72(11): 933-942. https://doi.org/10.1515/hf-2018-0033.
KeywordsHydrotrope, lignin nanoparticles (LNPs), low temperature fractionation, particle size and morphology, particle surface charge and aggregation
- Toward sustainable, economic, and tailored production of cellulose nanomaterials
- Rapid and near-complete dissolution of wood lignin at ≤80°C by a recyclable acid hydrotrope
- Fractionation of herbaceous biomass using a recyclable hydrotropic p–toluenesulfonic acid (p–TsOH)/choline chloride (ChCl) solvent system at low temperatures
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