采用共沉淀法制备了一种多金属普鲁士蓝类化合物———亚铁氰化铜镍钴(CNC-PB),采用 TEM、FTIR对其进行了表征,并利用 XRF和穆斯堡尔谱对CNC-PB吸附交换铯离子的机理进行了初步分析。通过静态吸附实验,研究了吸附时间、pH 值、Na+浓度、初始Cs+浓度、CNC-PB投加量等因素对吸附效果的影响,分析了吸附过程的反应动力学和吸附等温线。结果表明,随着溶液 pH 值的增大,CNC-PB对 Cs+的吸附量先增大后减少,吸附速度较快；在氯化钠溶液中,CNC-PB对Cs+具有极高的选择性吸附能力；CNC-PB对 Cs+的吸附过程符合准二级动力学方程模型和 Langmuir单分子吸附模型,最大吸附量为130.81 mg/g。
Herein,a multi-metal Prussian blue analogue-copper-nickel-cobalt hexacyanoferrate was prepared by co-precipitation method,and characterized by TEM,FTIR,XRF and Mossbauer spectroscopy.The influences of adsorption duration,pH value,Na+,initial Cs+ concentration and dosage were studied by static adsorption experi-ments.The results showed that,CNC-PB has high adsorption selectivity for Cs+ in sodium chloride solution,and can achieve adsorption equilibrium within a very short reaction time.In addition,with increase of pH value in solution, the adsorption amount of Cs+ increased first and then decreased.Pseudo-second-order kinetic equation can be used to describe the sorption kinetic behavior for Cs+ adsorbed by CNC-PB.The adsorption process fitted well with Langmuir adsorption isotherm model,and the largest adsorption amount was 130.81 mg/g.
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