高铁酸钾的制备工艺研究与表征

Preparation and characterization of potassium ferrate

高铁酸钾是一种新型绿色高效的水处理剂,为了探索经济、高效的制备高铁酸钾的工艺,以次氯酸钙为主要原料通过氧化反应制备高铁酸钾,考察反应时间、反应温度、次氯酸钙用量、重结晶温度和碱度等因素对产率的影响,并采用红外光谱对产物高铁酸钾进行表征。实验结果如下:当反应温度为25℃,次氯酸钙的用量为理论值的1.2倍,反应时间为40 min,在冰水浴中重结晶时,反应产率可达75%以上;红外光谱(FT-IR)对产物的结构表征证明合成产物为高铁酸钾。结果表明以次氯酸钙代替次氯酸钠制备高铁酸钾的工艺是可行的。

The potassium ferrate is a new high efficient-green water treatment agent.In order to explore the economic and efficient preparation technique,the potassium ferrate was preparated by the oxidation reaction with calcium hypochlorite as the raw material.The influence of reaction time and temperature,the amount of calcium hypochlorite,recrystallization temperature and alkalinity on yield was investigated.The structure of potassium ferrate was characterized by Fourier Transform Infrared（FT-IR） spectroscopy.The results show that the yield of potassium ferrate is more than 75% when reaction temperature is 25 ℃,reaction time is 40 min,ecrystallization temperature is 0℃ and the calcium hypochlorite dosage is 1.2 times to the theoretical value.Infrared spectroscopy structure characterization of the product indicated that the synthesized product is potassium ferrate,and it’s feasible that used calcium hypochlorite instead of sodium hypochlorite to preparate the potassium ferrate.