亚铁氰化铜镍钾复合水凝胶的制备及对铷的吸附性能

Preparation of potassium copper nickel ferrocyanide composite hydrogel and its adsorbability to rubidium

采用共沉淀法和冻融法制备了聚乙烯醇/壳聚糖/还原氧化石墨烯复合水凝胶包覆的亚铁氰化铜镍钾复合物(PCR/KCuNiFC),用于水溶液中铷(Rb)的分离。采用扫描电镜(SEM)、X射线衍射仪(XRD)和傅里叶变换红外光谱仪(FT-IR)表征了材料的形貌和组成。不同条件下Rb+在PCR/KCuNiFC上吸附的研究结果表明:PCR/KCuNiFC对Rb+的吸附过程符合准二阶动力学和Langmuir模型,且吸附过程是自发吸热的。电化学辅助脱附法可以有效地解吸PCR/KCuNiFC上吸附的Rb+。PCR/KCuNiFC在模拟卤水中对Rb+的吸附率可达到82.1%。

A polyvinyl alcohol/chitosan/reduced graphene oxide hybrid hydrogel coated potassium copper-nickel hexacyanoferrate composite(PCR/KCuNiFC)was prepared by coprecipitation and freeze-thaw method for the separation of rubidium(Rb)from aqueous solution.The morphology and composition of the composite were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),and Fourier-transform infrared spectroscopy(FT-IR).The adsorption behavior of Rb+on PCR/KCuNiFC under different conditions was studied.The results showed that the adsorption of Rb+by PCR/KCuNiFC conforms to pseudo-second-order kinetics and Langmuir model,and is spontaneous and endothermic.The desorption of Rb+from PCR/KCuNiFC could be promoted electrochemically.The adsorption efficiency of Rb+by PCR/KCuNiFC in simulated brine reached 82.1%.