Porous Organic Polymer Based On Melamine And5,5’-bis(bromomethyl)-2,2’-bipyridine: Functionalization With Lanthanide Ions For Chemical Sensing And Highly Efficient Adsorption Of Methyl Orange

Porous organic polymers with high surface area,tunable skeleton,and physical and chemical stability have been attracting attention.Among them,the nitrogen-containing porous polymers which can sensitize rare earth ions fluorescence have been applied in the fields of energy storage,separation,adsorption,and catalysis.The paper has developed novel multifunctional luminescent materials and their adsorption properties were also investigated.A new class of rare earth ions doped nitrogen-containing porous polymers was prepared and their fluorescence was investigated.（1）The POP-1 have been synthesized without a catalyst by using two organic monomers of melamine and 5,5’-bis（bromomethyl）-2,2’-bipyridine.The material was characterized by SEM,HRTEM,IR,TGA,EDS,ICP-MS and BET.The POP-1 can be applied in the many fields because this material has high thermal stability and large surface area.The adsorption capacity of POP-1 for the MO solution reaches up to 738.6mg/g,as far as we know,which is among the highest values for adsorbents known to date.It is worth noting that the material has an extremely fast adsorption capacity for MO.In our further investigation,the COF-1,2,COF-1,4,COF-1,6,and COF-1,8 can be used as an alternative material.Eu³⁺@POP-1 can be easily prepared by a postsynthetic method.The luminescence properties of Eu³⁺@POP-1 were studied by fluorescence spectrometry.Eu³⁺@POP-1 was developed as an efficient luminescent probe for sensing of Fe³⁺and methanol.Meanwhile Eu³⁺@POP-1 can also be used as a new ratiometric pH sensor.The experimental results show that the porous polymer POP-1 has a good application in fluorescence detection.（2）The ARPOP-1 have been synthesized without a catalyst by using two organic monomers of melamine and 5,5’-dialdehyde-2,2’-bipyridine.By postsynthetic incorporation of Eu³⁺and Tb³⁺into the ARPOP-1 organic polymer,the Eu³⁺@ARPOP-1and Tb³⁺@ARPOP-1 have excellent luminescence properties and fluorescence stabilities.The white light material Eu³⁺@Tb³⁺@ARPOP-1 with CIE parameters of 0.3346 and0.3345 was successfully prepared.However,its high cost is not conducive to the application,HBP-2 can be used as an alternative material.In addition,it was found that the Eu³⁺@ARPOP-1 is an efficient and selective fluorescent chemosensor for Cu²⁺detection.The emission intensity has a good linear relationship with concentration of Cu²⁺.Meanwhile Eu³⁺@ARPOP-1 can also be as a new luminescent probe for the sensing octane solvent molecules.The adsorption capacity of ARPOP-1 for the MO solution reaches up to 428.412 mg/g,as far as we know,which is among the highest values for adsorbents known to date.The proposed sensor of Eu³⁺@ARPOP-1 exhibited high sensitivity with a low detection limit of 1 nM,which can be attributed to the high adsorption capacity.