枝状聚合物修饰碳纳米管对铀吸附性能研究

Uranium Adsorption on WMCNT Modified by Dendrimer

采用枝状聚合物对氧化多壁碳纳米管(WMCNT)进行修饰,研究枝状聚合物PAMAM/WMCNT复合物对溶液中铀的吸附性能。研究了不同pH、吸附剂用量、铀初始浓度、吸附时间、离子强度等对吸附性能的影响,探讨了等温吸附理论模型和吸附过程的热力学模型。在室温下pH值为5、吸附时间80min、铀初始浓度1mg/mL时,吸附率达到97.25%。吸附等温模型符合Freundlich方程,吸附动力学符合拟二级动力学方程。

WMCNT modified with dendritic polymer PAMAM was used to study the adsorption of uranium from a- queous solution. The effects of pH, adsorbent dosage, uranium initial concentration, contact time and ionic strength on the adsorption of uranium were studied. Adsorption isotherm and kinetics were investigated. At room temperature, after 80 min contacting time, the adsorptivity reached 97.25% at pH 5 when uranium initial concen- tration is 1 mg/mL. The equilibrium data was described by Freundlich isotherms, and adsorption kinetics was de- fined by pseudo-second-order model.