Selective Removal of Organic Pollutants in Groundwater and Surface Water by Persulfate-Assisted Advanced Oxidation: The Role of Electron-Donating Capacity,Environmental Science & Technology

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Selective Removal of Organic Pollutants in Groundwater and Surface Water by Persulfate-Assisted Advanced Oxidation: The Role of Electron-Donating Capacity
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-08-28 , DOI: 10.1021/acs.est.3c04870
Xinru Liu _{1,

2} , Hehe Qin _{1,

2} , Siyang Xing _{1,

2} , Ying Liu _{1,

2} , Chengcheng Chu _{1,

2} , Dianhai Yang _{1,

2} , Xiaoguang Duan ₃ , Shun Mao _{1,

2}

Affiliation

The efficiency of persulfate-assisted advanced oxidation processes (PS-AOPs) in degrading organic pollutants is affected by the electron-donating capability of organic substances present in the water source. In this study, we systematically investigate the electron-donating capacity (EDC) difference between groundwater and surface water and demonstrate the dependence of removal efficiency on the EDC of target water by PS-AOPs with carbon nanotubes (CNTs) as a catalyst. Laboratory analyses and field experiments reveal that the CNT/PS system exhibits higher performance in organic pollutant removal in groundwater with a high concentration of phenols, compared to surface water, which is rich in quinones. We attribute this disparity to the selective electron transfer pathway induced by potential difference between PS-CNT and organic substance-CNT intermediates, which preferentially degrade organic substances with stronger electron-donating capability. This study provides valuable insights into the inherent selective removal mechanism and application scenarios of electron transfer process-dominated PS-AOPs for water treatment based on the electron-donating capacity of organic pollutants.

中文翻译：

过硫酸盐辅助高级氧化选择性去除地下水和地表水中有机污染物：给电子能力的作用

过硫酸盐辅助高级氧化工艺（PS-AOP）降解有机污染物的效率受到水源中有机物质的供电子能力的影响。在本研究中，我们系统地研究了地下水和地表水之间的供电子能力（EDC）差异，并证明了以碳纳米管（CNT）为催化剂的PS-AOP去除效率对目标水的EDC的依赖性。实验室分析和现场实验表明，与富含醌类的地表水相比，CNT/PS系统在去除高浓度酚类地下水中的有机污染物方面表现出更高的性能。我们将这种差异归因于PS-CNT和有机物-CNT中间体之间的电势差引起的选择性电子转移途径，其优先降解具有更强电子供给能力的有机物。这项研究为基于电子传递过程主导的PS-AOPs基于有机污染物的供电子能力的水处理的固有选择性去除机制和应用场景提供了有价值的见解。

更新日期：2023-08-28

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