Synthesis Of Magnetic Iron Nickel And Iron Nickel Maxtrix Composites And Their Effects On Absorption Ability And The Degradation Of Dyes

The industrial revolution has experienced three centuries, the input and use of fossile energy has reached its peak level, people have found that environment crisis is imminent to solve. Solar energy as a kind of clean energy is inexhaustible, the use of solar won’t cause secondary pollution. Therefore, how to develop the use of solar energy has become one of the key topic of energy development in the world. Recycling of the catalyst has been plagued by the scholars of the catalyst in a wide range of applications, and magnetic materials just help us broaden our thinking, so the combination between catalyst and magnetic materialsis aproblem needto solve.In this paper,we used hydrothermal synthesis method to synthesis NiFe₂O₄, water bath method to compose BiOI materials and a series ofBiOI/NiFe₂O₄ in different molar ratio. The catalysts were characterized by X ray diffraction（XRD）, scanning electron microscope（SEM）, Uv-Vis diffuse reflectance（UV-Vis DRS）, fluorescence（PL） and other characterization methods.We used organic dye like rhodamine B, methyl orange, methylene blue as pollutants to investigate the degradation ability of these photocatalysts. The specific research contents were as follows:（1）We took advantage of the principle of orthogonal experiment, employed the hydrothermal synthesis, took Fe（NO3）3·9H2O as Fe source, Ni（NO3）3·6H2O as Ni source, prepared series of NiFe₂O₄ by adjusting the reaction conditions. According to the situation of photocatalytic degradation of methylene blue by NiFe₂O₄, and then we chose the one Ni Fe₂O₄ which had best photocatalytic activity. Futher, we researched on the photocatalytic mechanism of NiFe₂O₄ by the capture agent experiments.（2）We used Bi（NO3）3·5H2O as Bi source, KI as I source, through the water bath synthesis, successfully composed BiOI with aspherical petal like. BiOI was characterized by various characterizations to analyze its surface morphology, optical properties and band distribution and other characteristics. We took methyl as the pollutant, according the photocatalyticcapability of degradation of methyl orange, to investigate the photocatalytic activity. Based on the trapping agent experimental results, we discussedthe mechanism of photocatalytic activity.（3）The optimal NiFe₂O₄ sample was selected, and then it was put into the preparation of BiOI in different material ratio. Composite catalyst BiOI/NiFe₂O₄ was characterized by means of different kinds of characterization technologies to study their surface morphology, physical and chemical properties. Through the experiment of photocatalytic degradation of methyl orange, sacrifice agent experiment, we studied the photocatalytic activity and catalytic reaction mechanism.（4）Select the 20% BiOI/NiFe₂O₄ composite sample as the research object to study its adsorption, study on the adsorption ability of RhB organic dyes, and further study its adsorption principle.