Abstract
We demonstrate a new green solvent consisting of ionic liquid and polyol to achieve a selective fractionation of lignin from biomass. The lignin from corn straw is rich in syringyl unit and phenolic hydroxyl group, resulting in excellent room-temperature phosphorescence (RTP) performance, antioxidation property and long-term photostability. Flexible film, fiber, aerogel and coatings with an ultralong RTP lifetime of 0.654 s are obtained. The lignin from corn straw completely blocks UV light of 290–100 nm at an extremely low usage due to many p-coumarate units. When the content is as low as 1.54 mg/g, which is two orders of magnitude lower than the previous reports, the corresponding sunscreen cream has a super-high sun protection factor (SPF) of 183.9. More importantly, the lignin self-assembles into nanospheres of 250–350 nm, preventing penetration into the skin. Such easily-available, abundant, low-cost, safe and natural lignin provides an innovative avenue for sustainable optical function materials.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (52173292) and the Youth Innovation Promotion Association CAS (2018040).
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Eco-Friendly Fractionation of Natural Straws: Sustainable Ultralong Room-Temperature Phosphorescence and Super Anti-Ultraviolet Materials
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**a, Z., You, J., An, H. et al. Eco-friendly fractionation of natural straws: sustainable ultralong room-temperature phosphorescence and super anti-ultraviolet materials. Sci. China Chem. (2024). https://doi.org/10.1007/s11426-024-2016-8
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DOI: https://doi.org/10.1007/s11426-024-2016-8