摘要
Exploring the adsorption of small molecules,such as dyes and iodine,by using novel functionalized MOFs has aroused widespread interest.In this work,seven isostructural compounds were synthesized successfully under solvothermal condition,namely[Ln_(2)(TATAB)_(2)]·xDMF·yH_(2)O(1-7;Ln=Eu^(3+),Gd^(3+),Tb^(3+),Dy^(3+),Ho^(3+),Er^(3+)and Y^(3+)),by the reaction of 4,4′,4″-((1,3,5-triazine-2,4,6-triyl)tri(azanediyl))tribenzoic acid(H_(3)TATAB)and rare earth metal ions.X-Ray diffraction analysis revealed that a window-shaped 3D structure was formed by“paddle wheel”-type[Ln_(2)(CO_(2))_(6)]secondary structural units connected to eight H_(3)TATAB ligands,in which the channel size reached 2.73 nm and the available volumes of all the compounds surpassed 61%.Considering such large porosity and theπ-electron walls of TATAB^(3-),the adsorption performance of 1 as a representative for five kinds of dyes in aqueous solution and iodine in cyclohexane solution were studied.Interestingly,1 displayed a highly sensitive and selective adsorption behaviour to the cationic dye methylene blue(MB).Moreover,the iodine-adsorption experimental results demonstrated that 1 had a reversible adsorption effect on iodine with an adsorption capacity of 758.72 mg·g^(-1).
基金
supported by the grants of the National Natural Science Foundation of China(No.21571091)
Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,P.R.China(project no.191001-K).
