环糊精多孔聚合物对水中染料分子的吸附性能及主客效应  

Adsorption Properties and Host-guest Effects of Porous Cyclodextrin Polymers for Dye Molecules in Water

作　　者：赵传靓 王子婕 闫仪 徐慧[2] 周俊垣 杨利伟[1] 王东升[2] ZHAO Chuan-liang;WANG Zi-jie;YAN Yi;XU Hui;ZHOU Jun-yuan;YANG Li-wei;WANG Dong-sheng(School of Civil Engineering,Chang'an University,Xi'an 710061,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Northwest Research Institute of Chemical Industry Co.,Ltd.,Xi'an 710061,China)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [3]西北化工研究院有限公司,西安710061

出　　处：《环境科学》2022年第2期907-919,共13页Environmental Science

基　　金：国家重点研发计划项目(2018YFE0103800)。

摘　　要：环糊精能够与多种有机污染物形成主-客体包合物,对去除水中种类复杂的染料分子具有独特的优势.利用刚性交联剂交联制备出了环糊精多孔聚合物(P-CDP),借助FT-IR、XPS、SEM和BET等技术对P-CDP结构进行表征,采用等温吸附和动力学吸附实验研究P-CDP对染料的吸附过程,并通过竞争实验探究P-CDP对水中染料分子的包合吸附性能及主客效应.结果表明,P-CDP热稳定性强,具有微孔结构,比表面积为108.745 m^(2)·g^(-1);Langmuir模型和准二级动力学模型对吸附过程的拟合度更高;吸附过程中静电作用强于主客效应,与环糊精空腔的匹配度高的污染物所形成的包合物的稳定性强,疏水性强的污染物更容易被包合于环糊腔内.P-CDP吸附染料后,洗脱再生5次后的去除率仍能达到80%以上.结果表明,P-CDP在染料废水处理中具有潜在的应用价值.Cyclodextrin can form host-guest inclusion complexes with a variety of organic pollutants and has unique advantages in removing complex dye molecules from water.In this study,a porous cyclodextrin polymer(P-CDP)was prepared using a rigid crosslinking agent,and the structure of the P-CDP was characterized by FT-IR,XPS,SEM,BET,and other technologies.The P-CDP was studied using isothermal adsorption and kinetic adsorption experiments.The inclusion adsorption performance and host-guest effect of the P-CDP for dye molecules in water were studied using competitive experiments.The characterization results showed that the P-CDP had strong thermal stability.It had a microporous structure with a specific surface area of 108.745 m^(2)·g^(-1).The Langmuir model and the pseudo-second-order kinetic model had a higher fitting degree for the adsorption process.The results of the competition experiments showed that the electrostatic effect was stronger than the host-guest effect in the adsorption process.Pollutants whose molecular configurations were highly matched with the cyclodextrin cavity could form inclusion complexes with high molecular stability.Contaminants with strong hydrophobicity were more likely to be encapsulated in the cyclodextrin cavity.After the P-CDP adsorbed the dyes,the removal efficiency after the fifth cycle of elution and regeneration remained above 80%.This study showed that P-CDP has potential application value in the treatment of dye wastewater.

关 键 词：环糊精聚合物 主客效应 包合吸附 疏水腔 染料废水 

分 类 号：X703.1[环境科学与工程—环境工程]