多孔纤维素表面聚离子液体交联结构构建与吸附性能研究

Construction of Polymeric Ionic Liquid Crosslinked Structures on Porous Cellulose and Study on Adsorption Performance

本研究开发了一种新型聚咪唑离子液体改性多孔纤维素(PC@PCIL),并用于高效去除水相中偶氮染料。通过碱/尿素溶剂体系,以棉浆为原料,制备多孔纤维素基质(PC),再引入1-乙烯基-3-丁基咪唑氯盐和3,3-1,4-亚苯基双(亚甲基)双(1-乙烯基咪唑二氯盐)作为共聚单体,采用可控活性聚合技术构建PC表面的聚离子液体交联结构,制备得到PC@PCIL吸附剂。该吸附剂对水相中刚果红的吸附量高达544 mg/g,吸附过程主要以静电相互作用、π-π堆叠和疏水作用的协同化学吸附机制为主导,遵循准二级动力学模型和Freundlich等温吸附模型。

This study developed a novel polymeric imidazolium ionic liquid-modified porous cellulose(PC@PCIL)for the removal of azo dyes from water with high efficiency.Porous cellulose substrates(PC)were prepared from cotton pulp through an alkali/urea solvent system,following by the introduction of 3,3-([1,1-biphenyl]-4,4-diylbis(methylene))bis(1-vinyl-1H-imidazol-3-ium)chloride and 3-butyl-1-vinyl-1H-imidazol-3-ium chloride as co-monomers.Controlled living polymerization technique was employed to construct polymeric ionic liquid interlinked structures on the surface of PC to prepare adsorbent PC@PCIL.This adsorbent exhibited an adsorption capacity of up to 544 mg/g for congo red in water,and the adsorption process was primarily governed by a synergistic chemical adsorption mechanism involving electrostatic interactions,π-πstacking,and hydrophobic effects,following the pseudo-second-order kinetic model and Freundlich isotherm model.