Synthesis, Characterization And Application Of Functionalized Magnetic Carrier

The proceeding of magnetic carrier techology, polymer magnetic carriers and silicamesoporous magnetic carder have been reviewed in recent years. The work of thisthesis is as following:Polymer magnetic carriers were produced by a modified suspensionpolymerization technique and modified by reacting with epoxy and amino compounds.The synthesis conditions such as the amount of the dispersion reagents, the ratio ofthe monomer, the dispersion medium and etc, were discussed. The functional polymermagnetic carrier was charaterized by SEM,VSM, XPS, TG; particle size analysis,acid-resistant experiment and etc. Adsorption experiments to the metal ions such asleads, lanthanum, yttrium and europium were carried out. The result showes that K_dvalue is 2840 for leads,K_d value is 22215 for lanthanum when treating singlelanthanide, but for mix solution of lanthanum, yttrium and europium, adsorption ofyttrium is better than the others. While treating the waste water with organic printingdye, decoloring rate can reach 97% in the best conditions, which is similar to that ofthe activated carbon.During the synthesis process of the functional silica mesoporous magnetic carrier,the amount of Fe₃O₄, calcination temperature and concentration of CTAB have beenstudied. The conditions of the surface funtionization were optimized, then thefunctional silica mesoporous magnetic carrier was obtained. It was charaterized bySEM,VSM, TG, acid-resistant experiment and etc. Adsorption experiments to themetal ions such as leads, lanthanum, yttrium and europium were carried out. Theresult showes that K_d value is 39459 for leads, K_d value is about 350 for lanthanumand yttrium when treating on single lanthanide; and for mix solution of lanthanum,yttrium and europium, adsorption of yttrium is better than the others.The effection of treating city wastewater with active bacteria attached on thefunctional silica mesoporous magnetic carrier, was studied. The result showes that theremoval ratio of COD can reach 82.7% after 24 hours'treatment in pH=7. Theremoval ability of active bacteria attached on the functional silica mesoporous magnetic carrier was found to be superior to that of biomass or the functional silicamesoporous magnetic carrier. It indicated that active bacteria attached on thefunctional silica mesoporous magnetic carrier is better for disposing city wastewaterand easy to separate from liquid.