In this presentation, we are proposing to produce lignocellulosic nanomaterials (LCNs) from untreated or least treated woody biomass at high yield using green deep eutectic solvent (DES). Several benefits can be envisioned by using untreated woody biomss for LCNs production. Firstly, it is much cheaper compared to chemical pulp due to the lack of chemical delignification and bleaching steps; Secondly, yield of LCNs could be increased by using raw woody materials containing all three major components; Thirdly, the presence of lignin is expected to modify the LCNs to make it more hydrophobic, which is ideal for improving the interfacial interactions with synthetic polymer when being used as reinforcing fillers. DES has been considered as a green and safe solvent as it is nonvolatile and recyclable. The low melting point of DES makes it extremely easy to be used in lab and industrial scale. DES is consisting of a hydrogen bond acceptor (quaternary ammonium salt) with a hydrogen bond donor. The hydrolysis was carried out at different reaction temperatures (80 and 100 °C), reaction times (3 and 6 h), as well as different chemical ratios. A yield as high as 68.3% of LCNs could be obtained at 80 °C for a 3 h reaction. The obtained LCN showed brown color and absorbance peak at 280 nm, indicating the presence of lignin particles. The LCNs appeared as rigid rod-like nanocrystals under TEM with width around 5-6 nm and length ranging from 200 to 500 nm. Lignin nanoparticle aggregates could also be observed under TEM with dimension ranging from several tens to hundreds of nanometers. Our research demonstrates the feasibility of producing LCNs from woody biomass at high yield, adding new products to the lignocellulosic nanomaterials that could find potential applications as concrete and/or plastic additives.

High-yield production of lignocellulosic nanocrystals using green deep eutectic solvent system

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.