当前位置：
X-MOL 学术
›
Environ. Sci. Technol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Electrochemical Hydrogen Peroxide Generation and Activation Using a Dual-Cathode Flow-Through Treatment System: Enhanced Selectivity for Contaminant Removal by Electrostatic Repulsion
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-23 , DOI: 10.1021/acs.est.4c05481 Yanghua Duan 1 , David L Sedlak 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-23 , DOI: 10.1021/acs.est.4c05481 Yanghua Duan 1 , David L Sedlak 1
Affiliation
|
To oxidize trace concentrations of organic contaminants under conditions relevant to surface- and groundwater, air-diffusion cathodes were coupled to stainless-steel cathodes that convert atmospheric O2 into hydrogen peroxide (H2O2), which then was activated to produce hydroxyl radicals (·OH). By separating H2O2 generation from its activation and employing a flow-through electrode consisting of stainless-steel fibers, the two processes could be operated efficiently in a manner that overcame mass-transfer limitations for O2, H2O2, and trace organic contaminants. The flexibility resulting from separate control of the two processes made it possible to avoid both the accumulation of excess H2O2 and the energy losses that take place after H2O2 has been depleted. The decrease in treatment efficacy occurring in the presence of natural organic matter was substantially lower than that typically observed in homogeneous advanced oxidation processes. Experiments conducted with ionized and neutral compounds indicated that electrostatic repulsion prevented negatively charged ·OH scavengers from interfering with the oxidation of neutral contaminants. Energy consumption by the dual-cathode system was lower than values reported for other technologies intended for small-scale drinking water treatment systems. The coordinated operation of these two cathodes has the potential to provide a practical, inexpensive way for point-of-use drinking water treatment.
中文翻译：
使用双阴极流通处理系统电化学过氧化氢的生成和活化：通过静电排斥增强污染物去除的选择性
为了在与地表水和地下水相关的条件下氧化痕量浓度的有机污染物，将空气扩散阴极与不锈钢阴极耦合，将大气中的 O 2转化为过氧化氢 (H 2 O 2 )，然后将其激活以产生羟基自由基（ ·哦）。通过将 H 2 O 2的生成与其活化分开并采用由不锈钢纤维组成的流通电极，这两个过程可以以克服 O 2 、H 2 O 2和 H 2 O 2 的传质限制的方式有效地运行。痕量有机污染物。两个过程的单独控制带来的灵活性使得可以避免过量H 2 O 2的积累以及H 2 O 2耗尽后发生的能量损失。在天然有机物存在的情况下发生的处理效率的降低明显低于均相高级氧化过程中通常观察到的情况。使用电离和中性化合物进行的实验表明，静电排斥可以防止带负电的· OH清除剂干扰中性污染物的氧化。双阴极系统的能耗低于用于小型饮用水处理系统的其他技术的报告值。这两个阴极的协调运行有可能为使用点饮用水处理提供一种实用且廉价的方法。
更新日期：2024-07-23
中文翻译：
使用双阴极流通处理系统电化学过氧化氢的生成和活化：通过静电排斥增强污染物去除的选择性
为了在与地表水和地下水相关的条件下氧化痕量浓度的有机污染物，将空气扩散阴极与不锈钢阴极耦合，将大气中的 O 2转化为过氧化氢 (H 2 O 2 )，然后将其激活以产生羟基自由基（ ·哦）。通过将 H 2 O 2的生成与其活化分开并采用由不锈钢纤维组成的流通电极，这两个过程可以以克服 O 2 、H 2 O 2和 H 2 O 2 的传质限制的方式有效地运行。痕量有机污染物。两个过程的单独控制带来的灵活性使得可以避免过量H 2 O 2的积累以及H 2 O 2耗尽后发生的能量损失。在天然有机物存在的情况下发生的处理效率的降低明显低于均相高级氧化过程中通常观察到的情况。使用电离和中性化合物进行的实验表明，静电排斥可以防止带负电的· OH清除剂干扰中性污染物的氧化。双阴极系统的能耗低于用于小型饮用水处理系统的其他技术的报告值。这两个阴极的协调运行有可能为使用点饮用水处理提供一种实用且廉价的方法。
京公网安备 11010802027423号