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 sol...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).展开更多
A redox-active tetrazine moiety is immobilized within a metal-organic framework(MOF)aiming at targeted construction of a cathode with improved performance for lithium–oxygen batteries.A 1,2,4,5-tetrazine(Tz)functiona...A redox-active tetrazine moiety is immobilized within a metal-organic framework(MOF)aiming at targeted construction of a cathode with improved performance for lithium–oxygen batteries.A 1,2,4,5-tetrazine(Tz)functionalized ligand is used to construct a nanoporous MOF,Tz-Mg-MOF-74,in which the redox activity of the Tz moiety is retained.Combining the redox activity of Tz with the porous nature of a MOF produced a Tz-Mg-MOF-74-based cathode with significantly improved electrochemical performance.Specifically,the material has improved sustainable capacity with a lower overpotential compared with otherwise similar batteries without Tz and other reported MOF-based catalysts.The present approach productively integrates electrochemical activity derived from redox-active moieties and MOFs,and this combination opens a new avenue for the design of effective materials for energy storage and conversion.展开更多
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).
文摘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 NSFC(nos.21421001,21531005,21905142,and 21671112)the Program of Introducing Talents of Discipline to Universities(no.B18030)+1 种基金the Natural Science Fund of Tianjin(nos.19JCZDJC37200 and 19JCQNJC02600)China.The authors thank Professor Brian Space(University of South Florida,Tampa,FL)for discussion and help.
文摘A redox-active tetrazine moiety is immobilized within a metal-organic framework(MOF)aiming at targeted construction of a cathode with improved performance for lithium–oxygen batteries.A 1,2,4,5-tetrazine(Tz)functionalized ligand is used to construct a nanoporous MOF,Tz-Mg-MOF-74,in which the redox activity of the Tz moiety is retained.Combining the redox activity of Tz with the porous nature of a MOF produced a Tz-Mg-MOF-74-based cathode with significantly improved electrochemical performance.Specifically,the material has improved sustainable capacity with a lower overpotential compared with otherwise similar batteries without Tz and other reported MOF-based catalysts.The present approach productively integrates electrochemical activity derived from redox-active moieties and MOFs,and this combination opens a new avenue for the design of effective materials for energy storage and conversion.
