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为通过电催化氧化体系中的极限电流密度(j
lim
)确定电催化氧化过程的传质/传荷界限
分别采用传统测试方法铁氰化钾-亚铁氰化钾体系和反向推导法
评价了两种方法用于测定电催化体系传质系数(k
m
)以确定j
lim
的适用性。通过对酸性红G和愈创木酚的电催化降解实验对传统测试方法进行了验证
测定了不同本体溶液浓度下同一体系k
m
;通过对愈创木酚的电催化氧化降解结果进行反向推导
考察了不同电流密度下同一体系的k
m
分析了传质和传荷两种控制阶段下的电解效果和能耗。实验结果表明:使用传统测试方法测定同一体系k
m
其测定结果受本体溶液浓度影响较大;反向推导法相比传统方法更适于测定电催化体系k
m
以确定j
lim
;施加不同电流密度
同一体系k
m
差异较大
对应j
lim
无法定量确定;当传荷控制阶段电流密度为50 A/m
2
时电解愈创木酚
5 h内能耗为0.018 kW·h/g
远低于传质控制阶段500 A/m
2
时的能耗0.135 kW·h/g
但是电解速率较低
愈创木酚的降解需要更长的电解时间。动态电流调控机制可改善长电解时间和高能耗两大缺陷
为电催化氧化技术的进一步工程应用提供参考。
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