The Preparation And Adsorptive Capability Of Imprinting Magnetic Adsorbent

It brings the different extent pollution during the exploitation, smelt and production. It is one of the acknowledged industrial pollution that heavy metal waste is harmful from mine, smelt, plating and chemical industry.Based on the advantages of molecular imprinting technique, biologic adsorption and magnetic materials, the magnetic adsorbents and imprinting magnetic adsorbents are prepared and researched to offer an approach to the recovery of metals and to the removal of heavy metal pollutants from industrial waster. This thesis consists of the following parts:The magnetic adsorbent is prepared by epichlorohydrin, magnetic powder suspension liquid and unproductive mycelium. The technical condition can be made sure by considering the removal ration and adsorptive capability as standards, and the resulting magnetic adsorbent were characterized by X-ray diffraction (XRD), FT-IR Spectrometer (FTIR), vibrating sample magnetometer (VSM) and Scanning Electron Microscopy (SEM); the adsorptive performances are investigated on Cu²⁺ and Cr⁶⁺ by the magnetic adsorbents. The results show that the maxiun of adsorption capacity for Cu²⁺ and Cr⁶⁺ are 16.581mg/g and 12.102mg/g respectively. The whole adsorption processes for Cu²⁺ and Cr⁶⁺ are according with first-order kinetic equation, but the processes fit to the second-order kinetic equation after 4h synchronously; the model of adsorption is fitted to Langumir equation.The optimum technical conditions of the imprinting magnetic adsorbent should be confirmed based on orthogonal experiment; the cognition capability and selective capability of the imprinting magnetic adsorbent are discussed elementarily by adsorbing different ions, and compared with non-imprinting magnetic adsorbents, imprinting magnetic adsorbent had higher adsorptive efficiency and selectivity, the adsorptive mechanism on the adsorbed different ions is investigated by XRD and FTIR. The results show that compared to the non-imprinting magnetic adsorbents, the maximum adsorption capacity of imprinting magnetic adsorbents could be improved from 16.581mg/g to 40mg/g. The sequence that imprinting magnetic adsorbents adsorbed the different metal ions could be identical to the sequence of ions radius, the higher adsorption and selectivity should be illuminated.Synthesized all kinds of the capabilities, the results showed that the imprinting magnetic adsorbents had higher selective recognition specificity and adsorptive capability, certain magnetic responsibility and mechanical strength, so it is applicable for the actual production.