Preparation Of Nanometer Fe₃O₄/Aspergillus Niger Magnetic Microspheres And Its Adsorption To U（Ⅵ）

Uranium mining and metallurgy production process to produce a large number of low concentrations of uranium-containing wastewater,The untreated uranium-containing wastewater seriously destroys the ecological environment,Human life and health constitute a serious threat,so effective treatment of uranium-containing wastewater is particularly important Uranium waste water treatment methods such sa traditional chemical precipitation,ion exchange and evaporation enrichmentexist low efficiency,high cost,easy to cause secondary pollution and many other issues,Emerging biocomposites have a wide range of industrial applications because of their high efficiency and low cost,and have become a hotspot in environmental management research in uranium mining and metallurgy.In this study,Fe₃O₄/Aspergillus niger were prepared by adding Aspergillus niger culture medium into Fe₃O₄.The effects of the amount of Fe₃O₄ and the rotation speed on the synthesis of Fe₃O₄/Aspergillus niger were studied.The optimum technical parameters were obtained.The effects of pH,temperature,adsorbent dosage,contact time and initial concentration of U（Ⅵ）on the adsorption of U（Ⅵ）on Fe₃O₄/Aspergillus niger were investigated by static adsorption test.The optimum conditions for the preparation of Fe₃O₄/Aspergillus niger were as follows:1mL（OD600=0.1）suspension suspension of Aspergillus niger,5.0g/LFe₃O₄,170r/min.The adsorption effect of Fe₃O₄/Aspergillus niger on U（Ⅵ）was 99.14%under the optimum conditions.The adsorption effect of Aspergillus niger on U（Ⅵ）was only78.9%.SEM-EDS and FTIR analysis showed that the microstructure of Fe₃O₄/Aspergillus niger was successfully synthesized and the microsphere structure was not destroyed.The results showed that the adsorbent had certain magnetic properties.The results show that pH is an important factor affecting the removal of U（Ⅵ）by Fe₃O₄/Aspergillus niger magnetic microspheres.p H4,25℃,U（Ⅵ）initial concentration of 10mg/L,Fe₃O₄/Aspergillus niger dosage of 1g/L,the removal rate was 98.89%,adsorption in 15h After the balance.The results of SEM-EDS showed that the structure of Fe₃O₄/Aspergillus niger microspheres was significantly destroyed.FTIR showed that Fe₃O₄/Aspergillus niger had the main hydroxyl groups,carboxyl,amide and so on.Desiccation experiments showed that the reusability of Fe₃O₄/Aspergillus niger was better,and the recovery of U（Ⅵ）in wastewater could be realized.