摘要
本研究制备了一种高密度阳离子聚离子液体接枝改性纤维素海绵(CS-PAPIM-co-PBBIM),并将其用作新型纤维素基吸附材料。通过设计合成1-乙烯基-3-(3-铵基丙基)咪唑二溴盐、双1-乙烯基-3,3’-(1,4-苯二甲基)咪唑二氯盐2种功能离子液体单体,采用可逆加成-断裂转移(RAFT)聚合技术,成功将其接枝到纤维素海绵表面,显著提高了吸附材料对甲基橙(MO)的吸附能力。结果表明,CS-PAPIM-co-PBBIM对MO的吸附量为312 mg/g;吸附机制分析揭示了吸附材料表面存在多种类型的吸附位点,吸附过程主要由聚咪唑离子液体层与MO之间的静电相互作用主导,π-π堆叠作用及疏水作用共同促进了化学吸附。经过5次吸附-脱附循环实验,CS-PAPIM-co-PBBIM仍能保持>85%的吸附性,展现出优异的循环稳定性。
In this study,a high-density cationic poly(ionic liquid)-grafted cellulose sponge(CS-PAPIM-co-PBBIM)was fabricated and employed as a novel cellulose-based adsorbent.Two functional ionic liquid monomers,1-vinyl-3-(3-ammoniumpropyl)imidazolium dibromide and bis-1-vinyl-3,3’-(1,4-phenylmethylene)imidazolium dichloride,were rationally designed and synthesized,and subsequently grafted onto the cellulose sponge surface through reversible addition-fragmentation chain-transfer(RAFT)polymerization.This surface modification markedly enhanced the adsorption performance of the material toward methyl orange(MO).The optimized CS-PAPIM-co-PBBIM exhibited a high adsorption capacity of 312 mg/g for MO.Mechanistic analysis revealed the presence of multiple types of adsorption sites on the adsorption material surface,where electrostatic attraction between the poly(ionic liquid)layer and MO served as the dominant driving force,andπ-πstacking interactions together with hydrophobic interactions synergistically facilitated chemisorption.Moreover,after five adsorption-desorption cycles,the adsorbent maintained over 85%of its initial adsorption capacity,demonstrating excellent regeneration ability and cycling stability.
作者
宋文琦
符泽鹏
任芷桦
彭亲
朱雪瑶
王思雨
杨成林
李沛睿
杨苗秀
SONG Wenqi;FU Zepeng;REN Zhihua;PENG Qin;ZHU Xueyao;WANG Siyu;YANG Chenglin;LI Peirui;YANG Miaoxiu(Technological Institute of Materials&Energy Science(TIMES),Shaanxi Key Lab of Liquid Crystal Polymer Intelligent Display,Xi’an Key Lab of Advanced Photo-Electronics Materials and Energy Conversion Device,Xijing University,Xi’an,Shaanxi Province,710123;School of Electronic Information,Xijing University,Xi’an,Shaanxi Province,710123;China National Pulp and Paper Research Institute Co.,Ltd.,Beijing,100102)
出处
《中国造纸学报》
北大核心
2025年第4期101-111,共11页
Transactions of China Pulp and Paper
基金
国家自然科学基金项目(22308283)
陕西省教育厅青年创新团队基金项目(24JP198)
西京学院“大学生创新创业训练计划”项目(X202312715091)。
关键词
纤维素
聚离子液体
吸附
甲基橙
接枝改性
cellulose
polymeric ionic liquid
adsorption
methyl orange
grafting modification
