The Experimental Study On Synthesis Of Nano Fe₃O₄-azocalix[4] Arene Derivatives With Carboxylation Functional Groups And Its Adsorption Of Uranium

As the third-generation supramolecular compound,Calixarene has been widely used in the fields of polymer materials,sensors and medicine and has obtained corresponding results for its characteristics of unique hole structure and easiness to modify.In order to advance the indentification and bonding of uranium ions,a new calixarene derivative was obtained by introducing special functional groups on the upper and lower edge of calixarene.The calix [4] arene is selected as the experimental object in this paper because its synthetic route and it has good coordination with uranium ions.Nanometre Fe3O4 has magnetic nanoparticles with large surface area and surface activity,it's widely used in metal wastewater treatment and resources recovery.Therefore,we design and synthesize functionalized nano Fe3O4-azocalix [4] arene derivatives with carboxylation functional groups M-p-TTPTA.Single factor test method is used to analyze the effect of adsorbent on uranium adsorption and its adsorption mechanism.The main contents of this paper:1)A novel functionalization material,5,11,17,23-4(4-hydroxyazobenzene)-25,26,27,28-calix [4] arene(p-TTPTA),was synthesized.This material was based on the calix [4] arene and decorated with p-aminobenzoic acid onthe edege of the calix [4] arene.The p-TTPTA was characterized by FT-IR,1H NMR,SEM and EDS.The effects of adsorption time,p H,dosage of p-TTPTA,initial concentration of uranium and temperatures on the adsorption of uranium by p-TTPTA were investigated.The results show that the p-TTPTA has stable conformation,rough surface,wide specific surface area and chemical compound with uranium.The optimal condition for the adsorption of uranium by p-TTPTA is p H=5.0,the initial concentration of uranium of 20 mg/L,p-TTPTA of 20 mg,time of 8 h and temperament of 30 ?.According to above analysis,p-TTPTA can adsorb better uranium.The kinetic model of magnetic functionalization material can be described by the pseudo-second-order model well.The isotherm model is fitted to Langmuir adsorption model.2)A novel functionalization material M-p-TTPTA,was synthesized.This material was based on the Functionalized nano Fe3O4 as a carrier to modified of p-TTPTA.The M-p-TTPTA was characterized by FT-IR,SEM.The effects of adsorption time,p H,dosage of M-p-TTPTA,initial concentration of uranium and temperatures on the adsorption of uranium by M-p-TTPTA were investigated.The results show that the M-p-TTPTA has more wide specific surface area and chemical compound with uranium.The optimal condition for the adsorption of uranium by M-p-TTPTA is p H=5.0,the initial concentration of uranium of 20 mg/L,p-TTPTA of 10 mg,time of 8 h and temperament of 30 ?.According to above analysis,M-p-TTPTA can adsorb better uranium.The kinetic model of magnetic functionalization material can be described by the pseudo-second-order model well.The isotherm model is fitted to Freundlich adsorption model.