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- 2017
纳米Fe3O4/黑曲霉磁性微球对U(Ⅵ)的吸附性能及机制
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Abstract:
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/黑曲霉磁性微球吸附U（Ⅵ）效果的影响。结果表明：pH值是影响Fe3O4/黑曲霉磁性微球去除U（Ⅵ）的重要因素。pH=4、温度为25℃、U（Ⅵ）的初始浓度为10 mg/L、Fe3O4/黑曲霉磁性微球投加量为1 g/L时，Fe3O4/黑曲霉磁性微球对U（Ⅵ）的去除率达到98.89%，在吸附15 h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/黑曲霉磁性微球成功合成且呈网状结构；FTIR结果表明，Fe3O4/黑曲霉磁性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 were prepared by adding culturing media nanoparticles in Fe3O4, then the static adsorption experiment was carried out, Through a static test, different experimental parameters such as solution pH, temperature, dosing, adsorption time and initial concentration were examined to investigate their effects on adsorption of U(Ⅵ) by Fe3O4/Aspergillus niger. The results show that pH value can be the important factor for affecting U(Ⅵ). When solution pH=4, 25℃, dosing quantity 1 g/L, U(Ⅵ) of the initial concentration is 10 mg/L, the adsorption rate is as high as 98.89%, adsorption process is verging to be balanced after 15 h. The prepared composites were characterized by SEM, EDS and FTIR. SEM-EDS show that part of the hyphae surface was coated with tiny particles and the structure is the grid. FTIR spectra demonstrate that -OH, -C═O and -CONH interact with U(Ⅵ). 国家自然科学基金（11475080）；湖南省高校创新平台开放基金（14K083）
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