Eco-friendly fractionation of natural straws:sustainable ultralong room-temperature phosphorescence and super anti-ultraviolet materials  

作　　者：Zhenghao Xia Jingxuan You Haojie An Yirong Wang Jinming Zhang Chunchun Yin Yaohui Cheng Kunfeng Jin Jun Zhang 

机构地区：[1]CAS Key Laboratory of Engineering Plastics,Institute of Chemistry,Chinese Academy of Sciences(CAS),Beijing 100190,China [2]School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]HongDa Research Institute Co.,Ltd.,Beijing 100176,China [4]Key National Laboratory of Solid State Microstructures,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210023,China

出　　处：《Science China Chemistry》2024年第7期2373-2381,共9页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(52173292);the Youth Innovation Promotion Association CAS(2018040)。

摘　　要：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 of290–400 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.

关 键 词：LIGNIN PHOSPHORESCENCE ANTI-ULTRAVIOLET biomass ionic liquids 

分 类 号：TB34[一般工业技术—材料科学与工程] TK6[动力工程及工程热物理—生物能]