离子液体修饰的三蝶烯多孔材料用于去除水溶液中阴离子染料  

Ionic Liquid Modified Triptycene-Based Porous Materials for Removing Anionic Dyes from Aqueous Solutions

作　　者：于方圆 周莉 何妍 彭昌军[1] 刘洪来[1] YU Fangyuan;ZHOU Li;HE Yan;PENG Changjun;LIU Honglai(School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Chemistry,Biology and Materials Science,East China University of Technology,Nanchang 330013,China)

机构地区：[1]华东理工大学化学与分子工程学院,上海200237 [2]东华理工大学化学生物与材料科学学院,南昌330013

出　　处：《华东理工大学学报（自然科学版）》2020年第2期155-163,共9页Journal of East China University of Science and Technology

基　　金：国家重点基础研究发展计划(2015CB251401);国家自然科学基金(20476070,20776069)。

摘　　要：将含氨基的咪唑离子液体3-丙胺-1-甲基咪唑三氟甲磺酰亚胺盐(IL-NH2)通过化学方法接枝在三蝶烯构建的多孔聚合物(TPP)上,制备了一种离子液体修饰的三蝶烯多孔聚合物(TPP-IL)材料,并通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱仪(FT-IR)、热重分析(TGA)仪和Brunauer Emmett-Teller(BET)等仪器对材料进行了表征,研究了TPP-IL对染料的吸附性能。发现TPP-IL对阴离子染料酸性绿25(AG25)和甲基橙(MO)表现出较高的吸附容量,吸附过程可采用准二级动力学模型描述;平衡吸附符合Langmuir等温吸附模型;室温下,TPP-IL对AG25和MO的最大吸附量分别为571.7 mg/g和501.9 mg/g,均约为未改性吸附剂TPP对AG25和MO吸附量的1.5倍,且TPP-IL具有非常好的循环使用性能。理论计算发现,TPP-IL吸附AG25和MO主要依靠静电吸引作用,同时也存在氢键相互作用。Organic dyes,especially the cationic dyes of methyl orange(MO)and acid green 25(AG25),have been emerged as harmful pollutants.Developing new materials for efficient adsorption and removal of organic dyes are thus of great significance.The design of porous organic polymers(POPs)with both good porosity and task-specific functionalization is still a critical challenge.In this work,an amino-containing imidazolium ionic liquid(IL-NH2)3-propylamine-1-methylimidazolium trifluoromethanesulfonimide salt was chemically grafted onto a triptycene-based porous polymer(TPP).The ionic liquid modified TPP(TPP-IL)was characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),thermo-gravimetric analysis(TGA),elemental analysis(EA),13C-nuclear magnetic resonance(13C-NMR)and nitrogen adsorption-desorption isotherms.The results showed that TPP-IL displayed a rough yet irregular morphology,and also was amorphous in nature.The novel polymer showed high Brunauer-Emmett-Teller surface area(of up to 781.1 m^2/g),porosity,and physicochemical stability.The resulting polymer materials were then used as solid adsorbent for removing organic dyes.It was found that TPP-IL showed higher adsorption capacity against the anionic dyes of AG25 and MO.The adsorption process could be described by a Langmuir isotherm adsorption model.Moreover,the experimental data fitted quasi-secondary kinetic model very well.At room temperature,the maximum adsorption capacities of TPP-IL against AG25 and MO were 571.7 mg/g and 501.9 mg/g,respectively,which were about 1.5 times as much as those of unmodified adsorbent TPP.Furthermore,TPP-IL exhibited an excellent recyclability.Theoretical calculations showed that TPP-IL adsorption of AG25 and MO mainly relied on electrostatic attraction,as well as hydrogen bonding interactions.Therefore,it is believed that TPP-IL with hierarchical porous structures,high surface areas,and physicochemical stability is a promising candidate for the purification an

关 键 词：离子液体 多孔聚合物 吸附 阴离子染料 

分 类 号：O658[理学—分析化学]