木质素/TiO2复合纳米颗粒合成及纳米纤维素基紫外屏蔽膜制备

Preparation of Lignin/TiO2 Nano Composites and Preparation of Nanocellulose-based UV-shielding Film

关键词:  木质素  二氧化钛  复合纳米颗粒  紫外屏蔽

Key Words:lignin  titanium dioxide  nano composites  UV-shielding

摘要:本研究利用碱木质素作为生物模板诱导剂，通过水热法成功合成了一种具有良好紫外屏蔽性能的木质素/TiO₂复合纳米颗粒。结果表明，木质素/TiO₂复合纳米颗粒具有锐钛矿晶型、良好的纳米粒径和热稳定性。同时，证实了木质素的含氧官能团和TiO₂表面羟基发生类酯化反应，从而使木质素与TiO₂形成包覆嵌顿式结构的复合材料。在此基础上，研究了木质素/TiO₂复合纳米颗粒与纳米纤维素水凝胶制备薄膜材料的抗紫外性能。结果表明，添加质量分数10% 的木质素/TiO₂复合纳米颗粒的纳米纤维素薄膜在全紫外线波段（200 ~ 400 nm）吸收了约90% 的紫外线，表明木质素/TiO₂复合纳米颗粒具有良好的紫外屏蔽能力。

Abstract:Alkali lignin was used as a biological template inducer， and lignin/TiO₂ UV-shielding nanoparticles were successfully synthesized by hydrothermal method. Comprehensive characterization results showed that lignin/TiO₂ composite nanoparticles had anatase crystal form， good nanoparticle size and thermal stability， it also confirmed that the esterification like reaction took place between the oxygen-containing functional groups of lignin and hydroxyl groups on the surface of titanium dioxide. Thus， lignin and titanium dioxide formed a composite material with an incarcerated structure. Besides， the UV-shielding property of the film prepared by lignin/TiO₂ nanoparticles and nanocellulose hydrogel was studied. The results showed that the nanocellulose hydrogel composite film with 10% lignin/TiO₂ nanoparticles could absorb about 90% UV light at the all band （200~400 nm）， indicating that lignin/TiO₂ nano composites had a good UV-shielding capability.