高铁酸盐的制备及稳定性研究

Study on Preparation and Stability of Ferrate

目的筛选出高铁酸盐的最佳铁源和稳定剂,并确定稳定剂的最佳投加量,解决高铁酸盐的不稳定性问题.方法通过对比试验,选用不同铁源制备高铁酸盐对比产率高低;在新制备的高铁酸盐溶液中投加添加剂,静置避光保存,定时测其吸光度.结果选用不同铁源时,高铁酸盐的产率从高到低为Fe(NO3)3、FeCl3、Fe2(SO4)3,分别为42.2%、37%、32.2%.投加NaIO4、NaSiO3不仅可以提高高铁酸盐的产率,而且可有效抑制高铁酸盐的分解,投加0.1%NaIO4,高铁酸盐的分解率较空白最多可降低78.58%,极大延长了高铁酸盐的保存时间.而CuSO4、Na2SO4的投加只会降低高铁酸盐的产率,加速高铁酸盐的分解.结论Fe(NO3)3为制备高铁酸盐的最佳铁源,NaIO4可有效抑制高铁酸盐的分解,从而延长了高铁酸盐的保存时间,很大程度上解决了高铁酸盐的不稳定性问题.

In order to solve the instability problem of the ferrate salts, the best rail sources and stabilizer of ferrate salts are selected, and the best dosage of the stabilizer is determined by the comparative test. The ferrate salts were prepared with different rail sources. Then the production rate was compared. Ferrate solutions with stabilizer were preserved in dark places, and the absorbances of those were measured regularly. The results showed with different rail sources, the yield of ferrate ranged from high to low were Fe（NO3）3, FeCl3 and Fe2（SO4）3 ,and their production rates are 42.2% ,37% and 32.2% respectively. NaIO4 and NaSiO3 improved the yield of ferrate salts, and effectively inhibited the decomposition of ferrate salts at the same time. Adding 0.1% NaIO4, the decomposition rate of ferrate salts could reduce to 1/5 of what it was, and it extended the preservation time. But NaaSO4, CuSO4 reduced the yield of ferrate salts and accelerated the decomposition of ferrate salts. Therefore Fe（NO3）3 is the best rail source of ferrate salts and NaIO4 is the best stabilizer for inhibiting the decomposition of ferrate salts.