Synthesis And Properties Of Ion Probes And Covalent Organic Framework Material Based On S-triazine

Ions play a very important role in living bodies and the environment.The presence of too many ions can affect human health causing disease;cause environmental pollution and affect plant growth.Therefore,the detection of ions is very important.As a means of detecting ions,ion probes have been widely concerned due to their high selectivity and specificity.It has become a research hotpot that designing ion probes with simple synthesis method,high selectivity and simple detection.In addition,covalent organic framework materials（COFs）is emerging porous materials in recent years.They have excellent characteristics such as controllable pores,large specific surface area,and high stability They have good application prospects in gas storage,catalysis and sensors.The 1,3,5-triazine structure is a multi-element heterocycle with symmetrical structure and strong electron affinity,and has excellent stability and corrosion resistance.In this paper,2,4,6-tris-（4-aminophenyl）-1,3,5-triazine（TAPT）was synthesized using trifluoromethanesulfonic and p-aminobenzonitrile acid as raw materials.Then explore the following:On the one hand,TAPT-1,TAPT-2 and TAPT-3 were separately synthesized by TAPT with 3,5-di-tert-butylsalicylaldehyde,2-pyridinaldehyde and 2-hydroxy-1-naphthaldehyde through aldol reaction.They were characterized by ¹H NMR,¹³C NMR,FT-IR,LCMS et al.The spectroscopy method was used to investigate the recognition performance and anti-interference performance of ions.TAPT-1 can selectively recognize Cu²⁺,Hg²⁺and F^-by UV-vis spectrum,and can realize naked-eye recognition for Cu²⁺.TAPT-2 has the best thermal stability and has a specific recognition for Co²⁺.TAPT-3 can realize UV-vis spcrtrum identification of Zn²⁺,Cu²⁺,Hg²⁺and F^-.the minimum detection limit of Zn²⁺can reach 1.80×10^-6 mol/L.On the other hand,COF-D was prepared by solvothermal method from TAPT and isophthalaldehyde,and characterized by FT-IR,BET,SEM,XPS and so on.COF-D is a structured amorphous material which having a specific surface area of 321.78 m²/g and pore size of 1.98 nm.In terms of iodine adsorption,COF-D has good adsorption performance,with a maximum adsorption capacity of up to 2 647 mg/g,and is also reusable.Cu@COF-D was prepared by loading copper acetate on COF-D,and has a lower porosity than COF-D.The catalytic performance was investigated by oxidation of styrene to benzaldehyde.20 mg catalyst,n（styrene）/n（HBTP）=1:3,the reaction temperature was 60℃,the reaction was performed for 7 h with CH₃CN as the solvent.The catalytic activity is the highest,and yield of benzaldehyde was 43.07%.