Study On The Adsorption Of Rare Earth Ion Imprinting On SBA-15/Y

With the rapid development of science and technology,the demand for resources is also growing.The recycling of non renewable resources is becoming more and more important.China is a country with rare earth resources,and its rare earth reserves have always been in the forefront of the world.Rare earth extraction and separation technology is also improving,but the development of rare earth recovery and utilization technology is relatively slow,especially in rare earth wastewater treatment,there has been no good recovery and treatment method.The discharge of rare earth wastewater not only causes irreparable damage to the environment,but also a waste of rare earth resources,because rare earth wastewater contains a certain amount of rare earth.Therefore,we need a method to treat rare earth wastewater,which can not only protect the environment,but also separate and enrich the rare earth in the wastewater.In this paper,La-IIP/SBA-15/Y and La-IIP/P-SBA-15 were successfully prepared by ion imprinting,and MCM-41 / Y was synthesized by hydrothermal method.The three kinds of synthetic materials were used as adsorbents to separate and enrich rare earth in rare earth wastewater,and the adsorbents were characterized by infrared and other means to explore and analyze the adsorption principle.(1)La-IIP/SBA-15/Y was successfully synthesized by using SBA-15/Y as carrier,polyethylenimine as functional monomer and epichlorohydrin as crosslinking agent.The results of IR and SEM show that La-IIP/SBA-15/Y is successfully synthesized.XRD shows that La-IIP/SBA-15/Y has the characteristics of mesoporous molecular sieve.ICP shows that La-IIP/SBA-15/Y has good selectivity.The values of△G less than zero in the thermodynamic equation and R2 in the quasi second order kinetic equation indicate that the adsorption process is a spontaneous chemical adsorption with high recycling efficiency.The results showed that the concentration of La-IIP/SBA-15/Y was 500 mg / L,the reaction time was 30 min,the optimum temperature was 35 ℃,the optimum acidity was pH 2,and the optimum adsorption capacity was 562.95 mg / g.(2)The composite molecular sieve MCM-41/Y was successfully synthesized by hydrothermal method.IR showed that the composite molecular sieve was successfully prepared.XRD showed that the composite molecular sieve had the structural characteristics of MCM-41.The results show that the concentration of lanthanum ion adsorbed on MCM-41/Y is 500 mg / L,the reaction time is 30 min,the optimal temperature is 35 ℃,the optimal acidity is pH 2,and the optimal adsorption capacity is 440.62 mg/g.The values of △G less than zero in the thermodynamic equation and R2 in the quasi second order kinetic equation indicate that the adsorption process is a spontaneous chemical adsorption with high recycling efficiency.(3)La-IIP/P-SBA-15 was successfully prepared by using P-SBA-15 as carrier,lanthanum ion as target ion,polyethylenimine as functional monomer and epichlorohydrin as crosslinking agent.The IR and SEM images showed that La-IIP/P-SBA-15 was successfully synthesized.ICP showed that La-IIP/P-SBA-15 had good selectivity.The values of △G less than zero in the thermodynamic equation and R2 in the quasi second order kinetic equation indicate that the adsorption process is a spontaneous chemical adsorption with high recycling efficiency.The results show that the concentration of La-IIP/P-SBA-15 in La ion solution is 500 mg / L,the reaction time is 5 min,the optimum temperature is 35 ℃,the optimum acidity is 5,and the optimum adsorption capacity is 544.14 mg / g.