Study On Synthesizing And Characterizing Of Zinc Ferrite Nanoparticles

With the development of science and technology, the advanced electronic productssuch as telecommunication, computer are widely used. There are different length ofelectromagnetic waves in the circumstances. The people have been getting attention onmicrowave absorption. Zinc Ferrite is an important absorption material, radiation canresist an electromagnetic wave; And then it is also an important catalyst。In the paper, Zinc ferrite nanocrystalline was prepared via co-precipitation methodand sol-gel method. TG-DTA, XRD, TEM and SEM were used to characterize crystallitesize and properties of the as-synthesized samples. On this basis, the Ba²⁺, Ag⁺, TiO₂havebeen doped. Its microwave absorbing properties and photocatalystic were studied andevaluated.The main research work and results are as follows:（1）ZnFe₂O₄nanoparticles were successfully synthesized by using zinc nitrate,ferrite nitrate, urea and ammonia as materials. The precursor of nanometer zinc ferritewas synthesized by sol-gel and co-precipitation method. The optimized conditions forpreparing ZnFe₂O₄nanoparticles were obtained（2）The research analyzed the main influence factor of precipitator, complexant,surfactant during reaction process. The optimum synthesis technique was given asfollows: ammonia as complex precipitator, the amount was15mL; The tartaric acid ascomplexant; The amount of surfactant was10g/L; The crystalline phase was inagreement with the characteristic diffraction peaks of ZnFe₂O₄in the JCPDS card.（3）We make the nanopowders into textiles, the best finishing process was: theamount of ZnFe₂O₄nanoparticles were4g/L, dipping30min at room temperature, preliminary drying is90℃, baking temperature is130℃。（4）The measurement of complex permittivity on the fibers. The results show thatthe dielectric loss of silk was bigger than cotton. Therefore, we make the nanopowdersinto silk can achieve good microwave absorbing properties.（5）The experimental results show that the dielectric loss of ZnFe₂O₄nanoparticlesdoped by Ba²⁺、Ag⁺lower than nondoped when the frequency was in the range from1to106Hz. The frequency was in the range from106to109Hz, The dielectric loss of ZnFe₂O₄nanoparticles doped by Ba²⁺、Ag⁺higher than nondoped.（6）The experimental results show that the photocatalytic activity of ZnFe₂O₄nanoparticles. The research in finishing electronagnetic wave absorption fabriccharacteristics of high wave absorption capability and good light fastness. The resultsshow that photocatalytic reactivity of ZnFe₂O₄nanoparticles were very low. And thephotocatalytic reactivity of TiO₂particles doped ZnFe₂O₄were higher than that of thepure TiO₂particles. The result coincides with fluorescence. The optimum technology is:the initial concentration of MB:10mg/L; the doping ratio of ZnFe₂O₄:2.0%; with300Wmercury lamp and500W xenon lamp irradiation.