微生物质水热碳锰复合材料对铀的吸附行为研究

Adsorption of Uranium on Microorganism-derived Hydrothermal Carbon Manganese Composite

以工业啤酒酵母为碳源,采用一步法合成了微生物质水热碳锰复合材料(MHTC),并利用XRD、FT-IR和SEM等对材料进行了表征。在此基础上,系统研究了不同C/Mn原子比、初始pH值、接触时间、初始铀浓度对MHTC吸附铀性能的影响。结果表明:C/Mn原子比为1∶10的碳锰复合材料(MHTC-10)对铀的吸附性能最优。在铀初始浓度为50 mg/L、初始pH=4.5条件下,12 h可达吸附平衡,最大吸附量为371 mg/g。吸附过程符合准二级动力学模型以及Freundlich等温模型。热力学数据表明,铀在MHTC-10上的吸附是一自发、放热的过程。该研究结果可为含铀环境中铀的分离富集提供新的思路。

Microorganism-derived hydrothermal carbon manganese composite (MHTC) was synthesized by one step method with industrial beer yeast used as the carbon source, and characterized by XRD, FT-IR and SEM. The adsorption behavior of uranium on MHTC was investigated as a function of C/Mn atomic ratio, initial pH, contact time and initial uranium concentration. The results show that MHTC with C/Mn atomic ratio of 1∶10 (MHTC-10) has the highest uranium adsorption capacity. The maximum adsorption capacity of 371 mg/g reaches at pH=4.5 with 12 h contact time when initial uranium concentration is 50 mg/L. The adsorption process conforms to the pseudo- second order model and Freundlich isotherm model. Thermodynamics data suggest that the adsorption process is spontaneous and exothermic. The results can provide a new idea for the separation and enrichment of uranium from uranium-containing aqueous.