Hierarchical porous polymeric ionic liquids with excellent adsorption performance for phenolic compounds
Hierarchical porous polymeric ionic liquids with excellent adsorption performance for phenolic compounds
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DOI：
10.1016/j.molliq.2020.113440
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发表时间：
2020-08
影响因子：
6
通讯作者：
Lili Zhang;Yigang Ding;Bingwen Long;L. Yao;Haiyuan Yuan;Dai Yafen-
中科院分区：
文献类型：
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作者：
Lili Zhang;Yigang Ding;Bingwen Long;L. Yao;Haiyuan Yuan;Dai Yafen-
以咪唑类离子液体为单体制备的高分子离子液体具有多级孔结构和丰富的刘易斯碱中心，能有效地吸附水溶液中的大分子和小分子酚类化合物。所合成的PIL对单宁酸（TA）、4-硝基苯酚（4-NP）和4-氯苯酚（4-CP）的最大吸附容量分别达到911 mg/g、460 mg/g和433 mg/g。在现有的吸附剂中，TA的容量是最高的。咪唑类离子液体提供的丰富的刘易斯碱性中心（N-和Cl-）和PIL特殊的分级孔结构是其优异的苯酚吸附性能的主要原因。4-NP和4-CP的吸附平衡数据符合Freundlich模型，TA的吸附平衡数据符合Langmuir模型。吸附机理分析表明，4-NP和4-CP主要以π-π作用为主，TA主要以氢键和静电作用为主。PIL可以容易地再生。该研究为含酚废水的处理提供了一种新的材料。
In this work, polymeric ionic liquids (PILs) based on imidazolium ionic liquid monomer, which possessed hierarchical porous structure and rich Lewis basic sites, could effectively adsorb both large-sized and small molecular phenolic compounds from aqueous solution. The maximum adsorption capacities of the as-synthesized PILs for tannic acid (TA), 4-nitrophenol (4-NP) and 4-chlorophenol (4-CP) reached as high as 911 mg/g, 460 mg/g and 433 mg/g, respectively. The capacity for TA was the highest among the existing adsorbents. The abundant Lewis basic sites (N-atom and Cl−) provided by imidazolium ionic liquids and the special hierarchical porous structure of PILs were responsible for its excellent phenolic adsorption performance. The adsorption equilibrium data of 4-NP and 4-CP fitted well with the Freundlich model while those of TA complied better with the Langmuir model. The mechanism analysis indicated that the adsorption for 4-NP and 4-CP was mainly due to π–π interactions, and that for TA was dominated by H-bonding and electrostatic interaction. The PILs could be easily regenerated. This study provided a novel material for the treatment of phenolic wastewater.