It is generally accepted that sulfate radical predominates pollutant removal when peroxomonosulfate (PMS) is activated by cobalt ion or cobalt-containing catalysts. Although sulfate radical is very reactive toward many contaminants, its nonselective reaction with various water constituents always limits its practical application. In this work, selective pollutant removal was achieved with oxidative filtration on a ceramic membrane doped with highly dispersed cobalt (Co-CM). It was observed that the oxidative filtration was insensitive to chloride, bicarbonate, and humic substances for pollutant removal, which is distinct from the oxidation relying on sulfate/hydroxyl radicals. Moreover, associated with very low Co²⁺ leaching (less than1 µg L⁻¹), the oxidative filtration used more oxidation capacity of PMS than the homogeneous PMS/Co²⁺. Unlike heterogeneous PMS activation with Co-CM in jar tests where sulfate radical dominates pollutant removal, the predominant oxidant of the oxidative filtration was confirmed to be surface-complexed PMS. This study revealed that the hydraulic condition is an important factor to be taken into account when analyzing the mechanism of PMS activation, and this novel reaction pathway would endow the oxidative filtration with high selectivity for pollutant removal as compared with traditional slurry reactions.

人们普遍认为，当过氧单硫酸盐 (PMS) 被钴离子或含钴催化剂活化时，硫酸根主要去除污染物。尽管硫酸根对许多污染物具有很强的反应性，但它​​与各种水成分的非选择性反应总是限制了它的实际应用。在这项工作中，通过在掺杂有高分散钴 (Co-CM) 的陶瓷膜上进行氧化过滤，实现了选择性污染物去除。据观察，氧化过滤对去除污染物的氯化物、碳酸氢盐和腐殖质不敏感，这与依赖硫酸根/羟基自由基的氧化不同。此外，与非常低的 Co ²⁺浸出相关（小于 1 µg L ^{- 1})，氧化过滤比均相PMS/Co ²⁺使用更多的PMS氧化能力。与在硫酸根主导污染物去除的罐子测试中用 Co-CM 激活多相 PMS 不同，氧化过滤的主要氧化剂被证实是表面络合的 PMS。这项研究表明，水力条件是分析 PMS 活化机理时需要考虑的重要因素，与传统的浆液反应相比，这种新的反应途径将赋予氧化过滤更高的污染物去除选择性。