Synthesis And Properties Of P-tert-butylcalix[4]arene Derivative-acrylic Acid Graft Copolymer

Calixarene is a macrocyclic compound with a cavity configuration and it is easily modified.Because of its unique properties,it has attracted much attention in the field of supramolecules.In order to enhance its reactivity,this article introduces functional groups at the bottom edge to generate calixarene derivatives with functional groups,and uses this as a crosslinking agent to free radically copolymerize with acrylic monomers under the action of initiators to form p-tert-butyl calix[4]arene derivative-acrylic acid copolymer.On this basis,this article introduces Fe₃O₄particles to generate a type of magnetic copolymer.Using p-tert-butyl calix[4]arene derivative-acrylic acid copolymer and magnetic copolymer as adsorbents,the adsorption performance and mechanism of the two copolymers are studied by adsorbing methylene blue(MB)and malachite green(MG).The experimental content of this thesis mainly has the following three parts.(1)Synthesize p-tert-butylcalix[4]arene derivative as a raw material on the basis of predecessors,and generate p-tert-butylcalix[4]arene derivative with carbon-carbon double bonds by coupling acryloyl chloride at the bottom edge.Under the action of initiator,it is grafted and copolymerized with acrylic acid to form p-tert-butylcalix[4]arene derivative-acrylic acid copolymer,and its structure is characterized by 1H-NMR and FT-IR methods.(2)Base on the synthesis of p-tert-butyl calix[4]arene derivative-acrylic acid copolymer,the synthetic experimental conditions are partially optimized.When the mass ratio of p-tert-butyl calix[4]arene acylated derivative and acrylic acid is 1/1,When the neutralization degree of acrylic acid is 30%and the polymerization temperature is 70°C,the copolymer has a good adsorption effect on MB.The optimized prepared copolymer is used as an adsorbent to study its adsorption performance by adsorbing dyes MB and MG.The result is that the optimal adsorption capacity of the copolymer for MB under optimal conditions is 117.9mg/g,and the adsorption rate is 98.26%,the optimal adsorption capacity of the copolymer for MG is71.71mg/g,and the adsorption rate is 79.67%,further analysis by means of adsorption kinetics and isothermal model shows that the polymer has a good effect on MB and MG,The adsorption of the polymer is closer to chemical adsorption and is dominated by monolayer adsorption.(3)Dissolve a certain amount of FeCl₃.6H₂O,FeCl₂.4H₂O solids in purified water,add quantitative p-tert-butyl calix[4]arene derivative-acrylic acid copolymer to the mixed solution,add ammonia water dropwise to keep the solution alkaline(p H=10)Finally,a magnetic nano Fe₃O₄/p-tert-butylcalix[4]arene derivative-acrylic acid copolymer is generated,and its structure is characterized by FT-IR,XRD,XPS and other methods.The magnetic copolymer is used as an adsorbent to study its adsorption performance and mechanism by adsorbing MB and MG.As a result,Under the optimal adsorption conditions,the optimal adsorption capacity and adsorption rate of the magnetic copolymer as an adsorbent for MB are 67.5mg/g and44.9%,respectively,and the optimal adsorption capacity and adsorption rate for MG are69.66mg/g and 77.4%.The further step shows that the magnetic nano Fe₃O₄/p-tert-butylcalix[4]arene derivative-acrylic acid copolymer has a good adsorption effect on MB and MG by means of SEM,adsorption kinetics and adsorption isotherm model.