Ju Ting, Zhang Zhiliang, Li Yang, Miao Xinfeng, Ji Jianbing
College of Chemical Engineering, Zhejiang University of Technology Hangzhou 310014 China
Zhejiang Province Key Laboratory of Biofuel, Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, Zhejiang University of Technology Hangzhou 310014 China.
RSC Adv. 2019 Aug 12;9(43):24915-24921. doi: 10.1039/c9ra05064g. eCollection 2019 Aug 8.
With the severe energy and environmental issues, lignin has received increasing attention as a renewable biomass feedstock. The development of lignin-based nanoparticles provides a new route to the valorization of lignin. In this work, we propose a simple continuous method to prepare lignin nanoparticles (LNS) using a microchannel reactor. Polyvinylpyrrolidone (PVP)/sodium dodecyl sulfate (SDS) were selected as stabilizers. Spherical-like lignin nanoparticles with an average size of 13 nm were obtained in a T-shaped microchannel reactor. The effects of solvent species, PVP/SDS mass ratio, and lignin solution flow rate on the size of LNS were investigated. The as-prepared LNS had a good stability during 60 days-storage and were used as an additive to form UV-shielding composite films with poly(vinyl alcohol) (PVA). Compared with raw lignin, the addition of LNS could enhance the UV-shielding efficacy by 13.3% in the ultraviolet spectrum (250 nm). The present work suggests that the microchannel reactor is a promising continuous approach to prepare LNS with versatile applications.
随着严峻的能源和环境问题，木质素作为一种可再生生物质原料受到了越来越多的关注。基于木质素的纳米颗粒的开发为木质素的增值利用提供了一条新途径。在这项工作中，我们提出了一种使用微通道反应器制备木质素纳米颗粒（LNS）的简单连续方法。选择聚乙烯吡咯烷酮（PVP）/十二烷基硫酸钠（SDS）作为稳定剂。在T形微通道反应器中获得了平均尺寸为13 nm的球形木质素纳米颗粒。研究了溶剂种类、PVP/SDS质量比和木质素溶液流速对LNS尺寸的影响。所制备的LNS在储存60天期间具有良好的稳定性，并用作添加剂与聚乙烯醇（PVA）形成紫外线屏蔽复合膜。与原始木质素相比，添加LNS可使紫外光谱（250 nm）中的紫外线屏蔽效果提高13.3%。目前的工作表明，微通道反应器是一种有前途的连续方法，可用于制备具有多种用途的LNS。
