Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou, Zhejiang 310023, China; Liaoning Key Laboratory of Lignocellulose Chemistry and Biomaterials, Dalian Polytechnic University, Dalian, Liaoning 116034, China.
Liaoning Key Laboratory of Lignocellulose Chemistry and Biomaterials, Dalian Polytechnic University, Dalian, Liaoning 116034, China.
Int J Biol Macromol. 2024 Jun;269(Pt 2):132145. doi: 10.1016/j.ijbiomac.2024.132145. Epub 2024 May 7.
Sulfonated lignin-based dye dispersants have intensively attracted attention due to their low cost, renewability and abundant sources. However, their utilization is limited by the low content of sulfonic groups and high content of hydroxyl groups in their complex lignin structure, which results in various problems such as high reducing rate of dye, severe staining of the fibers and uneven dyeing. Here, the multi-site sulfonated lignin-based dispersants were prepared with high sulfonic group content (2.20 mmol/g) and low hydroxyl content (2.43 mmol/g). When using it as the dispersant, the dye uptake rate was improved from 69.23 % to 98.55 %, the reducing rate was decreased from 20.82 % to 2.03 %, the K/S value was reduced from 0.69 to 0.02, and the particle sizes in dye system before and after high temperature treatment were stabilized below 0.5 μm. Besides, the dispersion effect was significantly improved because no obvious separation between dye and water was observed even if without the assistance of grinding process. In short, the multi-site sulfonation method proposed in this work could remarkably improve the performances of the lignin-based dye dispersants, which would facilitate the development of the dye dispersion and the high value utilization of lignin.
磺化木质素基染料分散剂由于其成本低、可再生性和丰富的来源而受到广泛关注。然而，其利用受到复杂木质素结构中磺酸基团含量低和羟基含量高的限制，导致各种问题，如染料还原率高、纤维严重染色和染色不均匀。在这里，制备了多磺酸基木质素基分散剂，其磺酸基含量高（2.20mmol/g），羟基含量低（2.43mmol/g）。当用作分散剂时，染料吸光度从 69.23%提高到 98.55%，还原率从 20.82%降低到 2.03%，K/S 值从 0.69 降低到 0.02，高温处理前后染料体系中的粒径稳定在 0.5μm 以下。此外，由于即使没有研磨过程的辅助，也没有观察到染料和水之间的明显分离，因此分散效果得到显著改善。总之，本工作中提出的多磺酸化方法可以显著提高木质素基染料分散剂的性能，这将有助于染料分散的发展和木质素的高值利用。
