摘要
The decomposition kinetics of FeO42- in the aqueous NaOH solutions of 7.0 mol·L-1, 10.0 mol·L-1 and 14.0 mol·L-1 were determined by spectrophotometry with and without ultrasonic action at 500 W and 25 kHz.The results showed that the decomposition followed first-order kinetics and the rate was faster with ultrasonic action than without ultrasonic action.The decomposition activation energies were 52.4 kJ·mol-1, 70.5 kJ·mol-1 and 91.5 kJ·mol-1 without ultrasonic action, and 49.6 kJ·mol-1, 66.6 kJ·mol-1 and 85.9 kJ·mol-1 with ultrasonic action, in the aqueous NaOH solutions of 7.0 mol·L-1, 10.0 mol·L-1 and 14.0 mol·L-1 respectively.The fact that the activation energies increased with increasing concentrations of NaOH indicated that FeO42- was much stable in a higher concentration NaOH solution.The effect of ultrasound on the decomposition kinetics of FeO42- decreased with operating temperature.
The decomposition kinetics of FeO4^2- in the aqueous NaOH solutions of 7.0 mol ·L^-1 , 10.0 mol ·L^-1 and 14.0 mol ·L^-1 were determined by spectrophotometry with and without ultrasonic action at 500 W and 25 kHz. The results showed that the decomposition followed first-order kinetics and the rate was faster with ultrasonic action than without ultrasonic action. The decomposition activation energies were 52.4kJ·mol^-1, 70.5 kJ ·mol^-1 and 91.5 kJ ·mol^-1 without ultrasonic action, and 49.6 kJ ·mol^-1, 66.6 kJ ·mol^-1 and 85.9 kJ ·mol^-1 with ultrasonic action, in the aqueous NaOH solutions of 7.0 mol·L^-1, 10.0 mol·L^-1 and 14.0 mol·L^-1 respectively. The fact that the activation energies increased with increasing concentrations of NaOH indicated that FeO4^2- was much stable in a higher concentration NaOH solution. The effect of ultrasound on the decomposition kinetics of FeO4^2- decreased with operating temperature.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第6期1461-1465,共5页
CIESC Journal
基金
国家自然科学基金项目(20476087
20176047
20576111)。~~
关键词
高铁酸盐
超声
分解反应
动力学
ferrate
ultrasound
decomposition reaction
kinetics
