含铬革屑负载亚铁氰化铜钾对铯的快速吸附

Rapid Adsorption of Cesium by Potassium Copper Ferrocyanide Loaded on Chrome Shavings

含铬革屑的资源化利用对皮革行业的可持续发展具有重要意义。文章在含铬革屑上负载亚铁氰化铜钾,成功制备了含铬革屑固定化亚铁氰化铜钾(KCuFC@CS)铯吸附剂。采用场发射电子扫描显微镜、X射线衍射仪、X射线光电子能谱仪和傅里叶变换红外光谱仪对材料的形貌和结构进行了表征,测试了其热稳定性,系统考察了KCuFC@CS对Cs^(+)的静态和动态吸附性能,并研究了其吸附Cs^(+)的机理。结果表明,KCuFC@CS对Cs^(+)的吸附可以在12 min内达到平衡,吸附速率快,吸附容量可达0.679 mmol·g^(-1),适用pH范围广(2~11),选择性高。填充1 g KCuFC@CS的吸附柱,可以有效处理1.122 L被放射性Cs^(+)污染的地表水,去除率达96%,表现出良好的去除性能。采用0.1 mol·L^(-1)的NH4Cl溶液可以对饱和的KCuFC@CS柱进行洗脱,具有较大的应用潜力。这项工作不仅拓展了含铬革屑的应用,而且提供了一种去除Cs^(+)的可行方法。

The resource utilization of chrome shavings is particularly important for the sustainable development of leather industry.In this study,an adsorbent,potassium copper ferrocyanide@chrome shavings(KCuFC@CS),was successfully prepared for cesium removal by loading potassium copper ferrocyanide on chrome shavings.The morphology and structure of the material were characterized by field-emission scanning electron microscopy(SEM),X-ray diffractometer(XRD),X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared spectroscopy(FTIR),and its thermal stability was assessed.The static and dynamic adsorption performance of KCuFC@CS toward cesium as well as its adsorption mechanism were systematically investigated.Results showed that KCuFC@CS could rapidly and selectively adsorb cesium and reach equilibrium within 12 min,with the maximum adsorption capacity of 0.679 mmol·g^(-1) and a wide applicable pH range of 2-11.The adsorption column filled with 1 g adsorbent could effectively treat 1.122 L of surface water contaminated by radioactive cesium with a removal rate of 96%,showing good removal performance.The saturated KCuFC@CS column could be eluted by using 0.1 mol·L^(-1) NH4Cl solution,showing great potential for application.This work not only extends the application of chrome shavings,but also provides a feasible method for the removal of Cs^(+).