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以ZrOCl2、Na2MoO4、K4P2O7为原料,合成了一种用于提铯的无机离子交换剂——焦磷钼酸锆(ZMPP),研究了ZrOCl2浓度对产物的结构及Cs+交换性能的影响。用傅里叶变换红外光谱(FT-IR)、热重分析(TGA)、X射线衍射(XRD)、扫描电子显微镜(SEM)等手段表征了ZMPP的微观结构,并测试了其耐酸性。FT-IR谱图表明,其中存在结构水和焦磷酸根。TGA结果显示,在110°C 590°C,焦磷钼酸锆逐渐失去结构水。XRD曲线显示,ZMPP为无定形物质。SEM观察发现,ZMPP为微米尺寸的不规则颗粒,与Cs+发生交换后表面变得光滑。合成的ZMPP具有良好的耐酸性。原料中ZrOCl2浓度对ZMPP的结构无明显影响,但其浓度增大有利于提高ZMPP对溶液中Cs+的交换容量。在中性条件下,当溶液中初始Cs+浓度为13.24 mmol/L时,ZMPP对Cs+的交换容量可达1.329 mmol/g。
In this paper, ZrOCl2, Na2MoO4 and K4P2O7 were used as raw materials to synthesize an inorganic ion exchanger Zinc pyrophosphate (ZMPP). The effect of ZrOCl2 concentration on the structure and Cs + exchange performance of the product was studied. The microstructure of ZMPP was characterized by FT-IR, TGA, XRD and SEM. The FT-IR spectrum shows that there is structural water and pyrophosphate in it. TGA results show that at 110 ° C 590 ° C, zirconium pyrophosphate gradually loses structural water. The XRD curve shows that ZMPP is an amorphous substance. SEM observation showed that ZMPP was irregular micron-size particles and the surface became smooth after exchange with Cs +. Synthetic ZMPP has good acid resistance. The concentration of ZrOCl2 in the raw material has no obvious effect on the structure of ZMPP, but the increase of concentration of ZOCP helps to increase the exchange capacity of ZMPP to Cs + in solution. Under neutral conditions, the exchange capacity of ZMPP for Cs + was 1.329 mmol / g when the initial concentration of Cs + in the solution was 13.24 mmol / L.