| Biological ion channels can open or close toward external stimuli,which show selective ion transport for ensuring the normal operation of life activities.Inspired by this,researchers are committed to the research of responsive and separated artificial nanochannel membranes to meet the application needs of intelligent responsive materials,environmental monitoring,and analytical separation.Chemists have modified the surface of nanochannel membrane with polymers to realize the construction of specific functional nanochannel membrane.However,it is a great challenge to improve or expand the performance of nanochannel membranes.Chemical substances on the surface of nanochannel membrane are the core to determine its performance.Supramolecular macrocyclic compounds have a series of advantages such as controllable cavity size and easy functionalization of upper and lower edges.Through the interaction between host and guest,they can be effectively used in analytical separation and intelligent response devices.Therefore,the nanochannel membranes modified by supramolecular macrocyclic compounds are expected to improve/expand their performance.Based on this,the thesis summarizes the research progress of response and separation nanochannel membranes,and the application of supramolecular macrocyclic compounds in the field of intelligent response materials and analytical separation.Specific functional pillararene and cyclodextrin macrocyclic compounds were designed and synthesized.Non-covalent or covalent strategies were used to bond pillararene/cyclodextrin macrocyclic compound to the surface of nanochannel membrane.Specific gas-responsive nanochannel membranes were constructed,and achieve efficient treatment of dye wastewater.The main research contents are as follows:（1）Carbon dioxide exchanged with oxygen in the blood through cell membrane channels,which maintain the balance of human metabolism.Inspired by this,diethylamino pillararene with specific CO2 responsiveness were accurately synthesized in this chapter.A supramolecular hierarchical self-assembly method was used to bond diethylamine aromatics to the surface of nanochannels.The CO2response performance of functionalized nanochannel membrane was investigated,and the behavior of gas regulating ion transport in confined space was demonstrated.The transfer rate of K+under N2 stimulation is 5 times of that under CO2 stimulation.Compared with the control experiment,the current change rate caused by CO2 stimulation was 2.5 times that caused by HCl stimulation when pH was kept the same,which clarified the nature of gas-responsive nanochannels,and the structure-activity relationship of gas-responsive nanodevices is revealed by COMSOL theoretical calculation.In this study,CO2 was used as the construction primitive of functional materials to establish a class of gas-built material system,providing a feasible pathway for C1 chemical conversion.（2）It is important to treat dye wastewater efficiently.In this chapter,chemical etching method was adopted to prepare MXene nanosheets（transverse size 500-800nm）.The surface of two-dimensional MXene nanosheet was modified by carboxymethyl-β-cyclodextrin（CM-β-CD）using covalent strategy.A series of MXene/CM-β-CD composite nanochannel membranes were prepared by vacuum-assisted self-assembly,which realized the efficient treatment of six dyes wastewater such as methylene blue rhodamine B and so on.Compared with the traditional MXene nanocrystalline membrane,the rejection rate of the novel macrocyclic composite nanochannel membrane over 99%,water flux increased 23.3 times.This study overcomes the trade-off（selective-permeability balance）effect commonly seen in membrane separation technology,which expands the practical application range of macrocyclic compounds and artificial nanochannel membranes,and provides theoretical guidance and technical support for the application of nanochannel membranes in the field of efficient wastewater treatment. |
