酰胺化碳微球的制备及其对铀的吸附性能影响

Preparation of amidate modified hydrothermal carbon spheres and its influence on adsorption property of uranium

以葡萄糖、丙烯酰胺为原料,过硫酸钾为引发剂,一步水热法合成了酰胺化碳微球(HTC-AM),并利用红外光谱、扫描电镜进行表征,同时研究了HTC-AM对铀的吸附性能。结果表明:温度298.15K,pH=5.0,吸附平衡时间150min时,HTC-AM达到最大的吸附能力,HTC-AM的吸附量由32.72mg/g提高到244.3mg/g,对铀的吸附符合准二级动力学模型、Langmuir吸附等温模型。说明HTC-AM可以作为高效的吸附剂用以除去水中的铀。

Amidate modified hydrothermal carbon spheres were synthesized by one step hydrothermal method using glucose and acrylamide as raw materials, potassium persulfate as evocator which were characterized by FT-IR and SEM. The materials were applied for the adsorption of uranium ions. The effects of pH, temperature, time and initial U（ Ⅵ ） concentrations on the adsorption capacity were studied including the adsorption isotherm and thermodynamics. The HTC- AM showed the highest uranium sorption capacity at initial pH of 5.0 ,contact time of 150min and temperature 298. 15K. The adsorption of U（ Ⅵ ） was remarkably improved after the amidation. The maximum adsorption capacity of HTC-AM for U（ Ⅵ） was 244.3mg/g,much higher than that of HTC（32.72mg/g）. The adsorptions of U（Ⅵ ） from aqueous solution on HTC-AM were fitted to the Langmuir adsorption isotherms. The kinetic data corresponded well to the pseudo second order equation. HTC AM was a promising sorbent for the efficient removal of U（Ⅵ） from aqueous solutions. Key words amidation,hydrothermal carbon sphere,adsorption,U（Ⅵ）