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    类普鲁士蓝KNiFC无机吸附剂在离子液体中吸附Cs+

    Adsorption of Cs+ by Prussian Blue Analogue KNiFC Inorganic Adsorbents in Ionic Liquid

      摘要
    • 摘要: 研究了类普鲁士蓝吸附剂K2NiFe(CN)6(KNiFC)在室温离子液体(RTILs)中对Cs+的吸附，包括吸附动力学、吸附等温线、吸附机理，并且研究了配体N，N，N′，N′-四甲基丙二酰胺(TMMA)、N，N-二甲基甲酰胺(DMF)、亚甲基二磷酸四异丙酯(TIPMBP)以及共存离子U(Ⅵ)和Th(Ⅳ)对Cs+吸附的影响。结果显示：温度为298 K时，Cs+的饱和吸附量为40.3 mg/g；温度为338 K时，其饱和吸附量为49.2 mg/g；吸附平衡时间约为18 h。吸附可以很好地用准二级动力学描述，吸附反应为吸热反应。通过对吸附剂进行X射线光电子能谱法（XPS）表征，证明其吸附机理为阳离子交换机理。当Cs+、U(Ⅵ)或Th(Ⅳ)共同存在时，会发生吸附竞争。而当在Cs+、Th(Ⅳ)或U(Ⅵ)混合溶液中分别加入TMMA、DMF、TIPMBP后，Th(Ⅳ)几乎不被吸附，Cs+的吸附量不变；U(Ⅵ)吸附量很小，Cs+的吸附量变化不大。当离子液体中Cs+、Th(Ⅳ)或U(Ⅵ)共存时，可以通过加入配体来实现类普鲁士蓝KNiFC无机吸附剂对Cs+的选择性吸附。

       

      Abstract: The adsorption of Cs+ by prussian blue analogue KNiFC in room-temperature ionic liquid (RTILs) was investigated in this paper, including adsorption kinetics, adsorption isotherm, adsorption mechanism, the effects of ligands (TMMA, DMF and TIPMBP) and coexisting ions U(Ⅵ), Th(Ⅳ). The results indicate that the saturated adsorption capacities of Cs+ are 40.3 mg/g at 298 K and 49.2 mg/g at 338 K respectively. The adsorption equilibrium time is about 18 h. The adsorption kinetic is found to follow the pseudo second order kinetic model. The adsorption reaction is endothermic reaction. The KNiFC is characterized by XPS and it is proved that the adsorption mechanism is cation exchange. Adsorption competition occurres when Cs+, U(Ⅵ) or Th(Ⅳ) coexist. When TMMA, DMF and TIPMBP are added to the mixture solution of Cs+, Th(Ⅳ) or U(Ⅵ) respectively, Th(Ⅳ) is hardly adsorbed and the adsorption capacity of Cs+ remains unchanged; and the adsorption capacity of U(Ⅵ) is very small, the adsorption capacity of Cs+ do not change significantly. When Cs+, Th(Ⅳ) or U(Ⅵ) coexist in ionic liquid, the selective adsorption of Cs+ on prussian blue analogue KNiFC inorganic adsorbent can be achieved by adding ligands.

       

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