Lv Jianbing, Fan Jiachen, Zhang Lei, Liang Chen, Chen Zuru, Hu Boxuan, Zou Yujun, Li Siyu
School of Civil and Traffic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
ACS Omega. 2025 Jun 4;10(23):24320-24328. doi: 10.1021/acsomega.5c00298. eCollection 2025 Jun 17.
The issue of clogging in highway tunnel drainage systems primarily stems from the long-term accumulation of floc-like sediments formed by the chelation of natural organic matter with metal ions. This study employed an electric field-enhanced Co-(II)-mediated peroxymonosulfate system (E/Co-(II)/PMS) for the efficient treatment of humic acid. Compared with the E/Co-(II), Co-(II)/PMS, or E/PMS systems alone, the E/Co-(II)/PMS system exhibited superior humic acid removal performance, with a degradation rate of 92.3% in 30 min, which significantly improved the oxidation efficiency. The study reveals the mechanism of Co-(II) activation of PMS to generate sulfate radicals (SO ) and hydroxyl radicals (HO), and maintains the reaction in a sustained and efficient manner by cathode-driven Co-(III)/Co-(II) cycling. The experimental results showed that pH = 7, 0.2 mM Co-(II), and 17 mA/cm current density were the optimal parameter combinations, and the degradation was inhibited by the inorganic anion CO , PO , and Cl, which increased with its concentration, with the strongest inhibitory effect being observed for Cl. The present study not only provides an efficient technical solution to address the issue of organic clogging in tunnel drainage systems, but also provides a theoretical and applied basis for the electrochemical oxidative degradation of organic pollutants in complex water quality through the analysis of the mechanism and optimization of the parameters.
公路隧道排水系统堵塞问题主要源于天然有机物与金属离子螯合形成的絮状沉积物的长期积累。本研究采用电场增强的钴（II）介导的过一硫酸盐体系（E/Co-(II)/PMS）对腐殖酸进行高效处理。与单独的E/Co-(II)、Co-(II)/PMS或E/PMS体系相比，E/Co-(II)/PMS体系表现出卓越的腐殖酸去除性能，30分钟内降解率达92.3%，显著提高了氧化效率。该研究揭示了Co-(II)活化PMS生成硫酸根自由基（SO ）和羟基自由基（HO）的机制，并通过阴极驱动的Co-(III)/Co-(II)循环使反应持续高效进行。实验结果表明，pH = 7、0.2 mM Co-(II)和17 mA/cm的电流密度是最佳参数组合，无机阴离子CO 、PO 和Cl对降解有抑制作用，且随其浓度增加抑制作用增强，其中Cl的抑制作用最强。本研究不仅为解决隧道排水系统有机堵塞问题提供了一种高效的技术方案，还通过机理分析和参数优化，为复杂水质中有机污染物的电化学氧化降解提供了理论和应用基础。
