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在Fe3O4中加入黑曲霉培养基混合培养制备了Fe3O4/黑曲霉磁性微球,通过静态吸附试验,考察了pH值、温度、吸附剂用量、接触时间及U(Ⅵ)初始浓度等因素对Fe3O4/黑曲霉吸附U(Ⅵ)效果的影响。结果表明:pH值是影响Fe3O4/黑曲霉去除U(Ⅵ)的重要因素。pH 4、25℃,U(Ⅵ)的初始浓度为10mg/L、Fe3O4/黑曲霉投加量为1g/L时,Fe3O4/黑曲霉对U(Ⅵ)的去除率达到98.89%,吸附在15h后趋于平衡。采用SEM、能谱分析、FTIR等手段分析了Fe3O4/黑曲霉磁性微球吸附U(Ⅵ)的机制。SEM-EDS结果表明,Fe3O4/黑曲霉微球呈网状结构且成功合成;FTIR表明,Fe3O4/黑曲霉微球与铀发生作用的主要基团有羟基、羧基、酰胺基等。
Fe3O4 / Aspergillus niger magnetic microspheres were prepared by mixing Aspergillus niger culture medium with Fe3O4, and the effects of pH value, temperature, the amount of adsorbent, contact time and the initial concentration of U (Ⅵ) Effect of Aspergillus niger Adsorption on U (Ⅵ). The results showed that pH value was an important factor affecting the removal of U (Ⅵ) by Fe3O4 / Aspergillus niger. The removal rate of U (¢ ö) by Fe3O4 / Aspergillus niger reached 98.89% when the initial concentration of U (Ⅵ) was 10 mg / L and the dosage of Fe3O4 / Aspergillus niger was 1 g / L at pH 4 and 25 ℃. After tends to balance. The mechanism of adsorption of U (Ⅵ) by Fe3O4 / Aspergillus niger magnetic microspheres was analyzed by SEM, EDS and FTIR. SEM-EDS results showed that the Fe3O4 / Aspergillus niger microspheres were reticulated and successfully synthesized. FTIR showed that the main groups of Fe3O4 / Aspergillus niger microspheres interacting with uranium were hydroxyl group, carboxyl group and amido group.