Preparation And Properties Of ?-Fe₂O₃ And ZnFe₂O₄ Hollow Spheres Through Carbon Spheres Template Method

During the past decades,metal oxide materials with hollow structure show great potential in many practical application fields,such as drug release,lithium ion battery and magnetic materials.Compared to other preparation methods,carbon microspheres template method shows lots of advantages such as broad universality,good repetition,uniform and controlled size,structure and morphology,and thus attracted great attention.In this article,based on surface chemical adsorption and surface chemical precipitation,a hollow ?-Fe₂O₃ and a hollow binary metal ZnFe₂O₄ microsphere were synthesized by using colloidal carbon microsphere as sacrificial temple,respectively.The crystal structure and chemical composition of the samples were characterized by XRD,EDS and XPS.SEM and TEM were used to examine the corresponding morphologies with altering experimental conditions.Furthermore,the properties of the as-obtained products with different microstructures were studied,including photocatalytic performance,magnetic properties and microwave-absorbing.Hollow ?-Fe₂O₃ was synthesized through chemical adsorption method using carbon microspheres as sacrifice template.The dependence of morphology and structure of ?-Fe₂O₃ on synthesis conditions,such as heat-treatment temperature,the proportion of solvent and salt concentration was studied.The photocatalytic,magnetic and microwave absorption properties of the products were also analyzed.Likewise,carbon microspheres as sacrifice template,binary metal oxide ZnFe₂O₄ and La doping ZnFe₂O₄ hollow microspheres were synthesized through chemical precipitation method.The effects of altering experimental conditions,including the use of different precipitants,temperatures and time,on morphology and structure of the obtained final products were discussed.Moreover,the magnetic and photocatalytic properties for both hollow microspheres have been studied.