氮氧共修饰木质素基多孔树脂的制备及其对染料的高效吸附

Preparation of Nitrogen, Oxygen Co-modified Lignin-based Porous Resins and Its Efficient Adsorption of Dyes

关键词:  木质素  超交联  胺化  聚合物  染料  吸附

Key Words:lignin  hyper-cross-linked  amination  polymers  dyes  adsorption

摘要:以从酸爆杨木中提取的有机溶剂木质素（OL）为原料，以对氯甲基苯乙烯（VBC）为单体、乙二醇二甲基丙烯酸酯（EGDMA）为交联剂，通过悬浮聚合法合成了木质素基树脂球前体（B），并在Lewis酸催化剂下进行Friedel-Crafts反应，以形成刚性的超交联网络结构，从而得到高比表面积、高氧含量的木质素基超交联树脂球（HB）。将吸附效果最好的HB与二乙烯三胺（DETA）进行胺化改性，得到氮氧共修饰木质素基多孔树脂（HAB），并用于去除水体中罗丹明B（RhB）。结果表明，VBC添加量为2.0 g时，HAB对RhB有最佳的吸附性能，Langmuir模型拟合其最大平衡吸附容量为213.7 mg/g，动力学拟合表明其吸附速率主要受扩散过程控制，且在150 min内能达到吸附平衡，其吸附量随温度升高而升高，对RhB吸附是一个吸热过程。

Abstract:Lignin based resin ball precursor （B） was synthesized by suspension polymerization using organic solvent lignin （OL） extracted from acid exploded poplar wood as raw material， p-chloromethylstyrene （VBC） as monomer， and ethylene glycol dimethyl acrylate （EGDMA） as crosslinking agent. Friedel-Crafts reaction was carried out under Lewis acid catalyst to form a rigid super crosslinking network structure， resulting in high specific surface area and oxygen content of lignin based super crosslinked resin balls （HB）. The best adsorption effect of HB was aminated with diethylenetriamine （DETA） to obtain nitrogen oxygen co-modified lignin based porous resin （HAB）， which was used to remove rhodamine B （RhB） from water. The results showed that when the VBC addition was 2.0 g， HAB had the best adsorption performance for RhB. The Langmuir model fitted its maximum equilibrium adsorption capacity to be 213.7 mg/g. The kinetic fitting showed that its adsorption rate was mainly controlled by the diffusion process and could reach adsorption equilibrium within 150 min. The adsorption capacity of HAB increased with temperature， and its adsorption of RhB was a endothermic process.