Design,Synthesis And Adsorption Properties Of Calix[4]arene Crosslinked Polymer

Global water resources are often polluted by aromatic compounds and organic dyes,and there are two or more benzene rings in the structure of the pollution source,which are very difficult to degrade.Therefore,the pollution of ecological environment is becoming more and more serious,which has aroused people’s intense concern.Firstly,a trichlorotriazine-derived calix[4]arene and 1,3,5-tris（4-aminophenyl）benzene were crosslinked to generate a calix[4]arene crosslinked polymer（C4CP-1）that can serve as a highly efficient adsorbent for separating cationic dyes from water.In particular,this polymer exhibited a removal efficiency over 99.6%and 99.4%for methylene blue and toluidine blue within five minutes,respectively.Langmuir isotherm adsorption models demonstrated that the maximum equilibrium adsorption capacity for methylene blue and toluidine blue was reached to 1806.82 and 2161.32 mg g^-1,respectively.The results suggest that the adsorption is mainly dependent on the electrostatic interactions andπ-πinteractions between C4CP-1 and the organic dyes.Furthermore,the adsorption capacities of the adsorbent were maintained at high levels after five cycles.Its excellent adsorption capability and recyclability make C4CP-1 a promising candidate for potential applications in water purification.Next,based on the good performance of C4CP-1,a trichlorotriazine-derived calix[4]arene is used as an active intermediate,and 2,4,6-tris（4-aminophenyl）-1,3,5-Triazine polymerization reaction produces calix[4]arene crosslinked polymer（C4CP-2）,which can be used as an effective adsorbent for removing aromatic compounds,especially for hydroxylated aromatic hydrocarbons（HAH）:2-naphthol and 1-naphthol pollutants have specific adsorption,within 5 min,the removal rates of 1-naphthol and 2-naphthol reached 92.45%and97.65%,respectively.C4CP-2 has the advantages of high adsorption efficiency and good reproducibility for polycyclic aromatic hydrocarbons.Therefore,it is guessed that the calix[4]aromatic polymer containing amine linkages has super adsorption capacity for hydroxylated aromatic hydrocarbons（HAH）pollutants in water.