Preparation Of Fe³⁺ Magnetic Imprinting Microspheres And Its Adsorption Performance

When the iron ions content is too high in the water, It will have different degrees of effects to the organism, The purpose of this thesis is to research a kind off organic/ inorganic composite magnetic molecularly imprinted microspheres and offer a new thought and method to selective separation iron ion.Alpha methylacrylic acid was used as functional monomer, Fe3 + was employed as imprinting template ion and dimethyl acrylic acid glycol ester was served as the crosslinking agent, ethyl orthosilicate modified magnetic Fe3O4 particles was used as the carrier, an nover iron ions magnetic molecularly imprinted microspheres(MMIPs)was prepared by suspension polymerization imprinting technique. Fourier infrared spectrum, scanning electron microscopy(sem) and DTA are used for characterized the MMIPs. The results showed that the MMIPs are syntheticd successfully.Under the static conditions, the Fe3 + concentration, p H and temperature are used for study on the absorption performance of the MMIPs. The result showed that the best adsorption conditions are Fe3+= 200mg/L, p H=4, T=313K. Combined with quasi kinetics of primary and secondary model to study the the adsorption process of MMIPs. It founded that quasi level 2 kinetics model is more applicable to describe the adsorption process. The linear correlation coefficient is 0.997. through the Langmuir, Freundlich and Temkin isotherm adsorption equilibrium model to study the adsorption law; It Found that the Langmuir model more applicable to describe the adsorption process, The linear correlation coefficient is 0.999; Further study on the mixed metal solution of containing Ni2 +, Cu2 +, Zn2 + and Fe3 +. It was showed that the MMIPs of Fe3 + adsorption characteristics of single choice, and the adsorption performance of MMIPs to Fe3+ is much higher than the other three metal ions, The Selective separation factor of 68.2. The adsorption- stripping for MMIPs repeat 10 times after the experiment, It was found that the MMIPs is stable,and it just had a little change of adsorption performance.Under the condition of dynamic adsorption, Examines the effect of the Fe3+ initial concentration, column, flow rate and p H on MMIPs packed column adsorption performance. The adsorption quantity is 15.68mg/g, breakthrough time is 31 min. It is concluded that the best adsorption conditions is Fe3 + concentration of 100 mg/L, high column is 40 mm, flow rate of 2.0 m L/min and p H = 4, the adsorption quantity is 15.68mg/g, breakthrough time is 31 min. Combined with Thomas, Yoon- Nelson, Wolborska and BDST dynamic model to analyze the dynamic behavior of MMIPs adsorption Fe3 +. It was further proved that the adsorption process is the chemical adsorption. Thomas and Yoon- Nelson model adsorption quantity is calculated by theory is all most equel to experiment data, After further study on the adsorption of Fe3+ MMIPs packed column elution behavior, the results show that the 15 m L hydrochloric acid solution of 0.6 mol/L resulted in a good desorption of Fe3+ at MMIPs column height of 40 mm and flow rate of 1.0 m L/min. Desorption time is short, and Fe3 + was easily recycled.