摘要
采用比表面积较大的铁电极和两阴夹一阳极的全氟离子隔膜电解槽 ,在 30 3～ 30 8K和 16mol/L氢氧化钠中 ,可快速电合成获得 0 .4 0～ 0 .4 9mol/L高铁酸钠溶液。研究了该条件下高铁酸钠的电合成与分解动力学。发现高铁酸钠表观生成速率由高铁酸钠的电合成与分解两部分组成 ,其速率方程式为r(FeO42 - ) 表观 =k电解c2(OH- ) -k分解c1.3 4 (FeO42 - ) c0 .3 4 [Fe(OH) 3] /c(OH- ) ,在 2 79～ 318K高铁酸钠电合成与分解的表观活化能分别为 34kJ/mol和 74kJ/mol,指前因子分别为 4 0 5mol-1·L·h-1和 2 .6× 10 13 mol0 .3 2 ·L-0 .3 2 ·h-1。据此可圆满解释电合成过程中诸多现象。
The Na 2FeO 4 solution with the anolyte concentration range from 0.40 to 0.49 mol/L can be obtained by the quick electrolysis in 16 mol/L NaOH solution and at the temperature of 303～308 K when using an iron anode with larger specific surface area and a full fluorine ionic membrane electrolytic cell in which an anode lying between the two cathodes.The kinetics of electrolysis and decomposition of ferrate(Ⅵ)was investigated in the above condition.It is found that the apparent yield speed of ferrate(Ⅵ)is composed of electrolysis and decomposition whose speed equation is r (FeO 2- 4) =k e c 2 (OH -) -k d c 1.34 (FeO 2- 4) c 0.34 /c (OH -) .In the temperature of 279～318 K,the apparent activated energys of electrolysis and decomposition about ferrate(Ⅵ)are 34 kJ/mol,74 kJ/mol respectively,their relative exponential factors are 405 mol -1·L·h -1 and 2.6× 10 13 mol 0.32·L -0.32·h -1.The series of phenomena appearing in the electrolysis process are able to be explained reasonably by the above equation.
出处
《无机盐工业》
CAS
2003年第4期17-19,35,共4页
Inorganic Chemicals Industry
