State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Ningxia University, Yinchuan 750021, China.
Int J Biol Macromol. 2023 Aug 30;247:125761. doi: 10.1016/j.ijbiomac.2023.125761. Epub 2023 Jul 8.
Herein, DES lignin was obtained by pretreatment of grapevine with a deep eutectic solvent (ChCl-LA). A novel chitosan-DES lignin composite aerogel material (CS-LIG aerogel) was prepared to adsorb methylene blue (MB), Congo red (CR), catechin (C), and epicatechin (EC). The CS-LIG aerogel was systematically characterized by modern technological instruments. It was demonstrated that the DES lignin was successfully incorporated and had an important effect on the morphological structure and adsorption of dyes and natural products in the aerogel. The adsorption kinetic models for both adsorbed CR and MB are pseudo-second-order models. Adsorption isotherms followed Langmuir for the adsorption of CR and Freundlich for the adsorption of MB. The π-π interaction and hydrogen bonding of DES lignin aromatic groups in CS-LIG aerogels were responsible for the adsorption of C and EC with 86.42 % and 90.85 % removal rates, respectively. This study opens a new avenue for the high-value utilization of DES lignin and the preparation of chitosan-based composites for the adsorption of dyes and purification of natural products.
本文采用深共晶溶剂（ChCl-LA）对葡萄藤进行预处理，得到 DES 木质素。为了吸附亚甲基蓝（MB）、刚果红（CR）、儿茶素（C）和表儿茶素（EC），制备了一种新型壳聚糖-DES 木质素复合气凝胶材料（CS-LIG 气凝胶）。采用现代技术仪器对 CS-LIG 气凝胶进行了系统的表征。结果表明，DES 木质素成功掺入，并对气凝胶中染料和天然产物的形态结构和吸附具有重要影响。CR 和 MB 的吸附动力学模型均为拟二级模型。CR 的吸附等温线遵循朗缪尔模型，而 MB 的吸附等温线遵循弗雷德里希模型。CS-LIG 气凝胶中 DES 木质素芳族基团的π-π 相互作用和氢键是吸附 C 和 EC 的原因，去除率分别为 86.42%和 90.85%。该研究为 DES 木质素的高值化利用以及壳聚糖基复合材料的制备开辟了新途径，用于吸附染料和天然产物的纯化。
