Preparation And Application Of Carbon Nano-dots Modified MOF

Metal-organic Frameworks(MOFs)is a porous organic-inorganic hybrid material formed by self-assembly of a metal or metal cluster and an organic ligand.Due to its rules,large specific surface area and tunable pore structure,MOFs can be used as supports,sensors,electronic devices and gas separation applications.At the same time,a large number of exposed active sites on the MOFs material and a controllable framework of the acceptable functional groups also make it possible to modify the integrated synergistic catalyst.The main work of this paper is to modify and apply MOFs materials from two directions by using carbon nano-dots.First,the MOFs material is used as a carrier to combine with carbon nano-dots to obtain a white phosphor and applied to WLED.The second is to use an amine-functionalized MOFs material to combine with carbon nano-dots to obtain a synergistic catalyst and apply it to fixed CO₂.Based on MOFs materials,they are applied to two different fields.The article draws the following conclusions:Based on the MOL-101(Al)regular morphology and controllable organometallic framework of MOFs,we propose two different strategies for combining carbon nanodots.First,MIL-101(Al)raw materials and carbon nano-dots are used to obtain new CMOFs by hydrothermal method.Second,carbon nano-dots are directly embedded in MIL-101(Al)channels by hydrothermal method.Two different phosphors of blue and red were obtained by two different strategies,and then mixed and mechanically ground at a mass ratio of 1:4 to obtain a fluorescent white fluorescent powder.Finally,the white phosphor was encapsulated with a resin to obtain a CIE of(0.32,0.38),a color temperature of 5775 K,and a color rendering index of 81.6.Therefore,the modification based on MOFs materials and using carbon dots not only achieves the purpose of fluorescence tuning but also provides a new preparation idea for preparing new MOFs materials.The novel CDs@NH₂-MOFs(Ni)were obtained by hydrothermal reaction of carbon nano-dots with NH₂-MOFs(Ni).The characterization of CDs@NH₂-MOFs(Ni)was compared with NH₂-MOFs(Ni).The topography has changed and the specific surface area has been increased.Based on the optimized temperature,pressure,time and other conditions,the optimal conversion rate of CO₂ as a raw material to react with epoxide and convert to cyclic carbonate was explored by using CDs@NH₂-MOFs(Ni)/n-Bu₄NBr catalytic system.Among them,the aliphatic acyclic epoxide conversion rate is as high as 95%or more,the aromatic epoxy oxystyrene conversion rate is 88%,and only the cyclohexene oxide has a low cycloaddition conversion rate.Therefore,carbon nano-doped modified MOFs materials are expected to become integrated synergistic catalysts for fixed CO₂ in the future.