Efficient and selective removal of water pollutants remains a critical challenge. Here, we addressed this challenge by ingeniously engineering FeOCl via polyaniline intercalation and dodecyl group modification (FeOCl-P-S) to improve its activity and selectivity for the in situ removal of hydrophobic phenolic compounds. We further encapsulated the catalyst inside commercial cheap corundum balls and developed a “millimeter-scale reactor”, which maintained a high efficiency of 86.02% after ten cycles with negligible physical changes. Moreover, we established the synergy between anodic (generating H⁺, O₂, and IrO₃) and cathodic reactions (utilizing H⁺ and O₂) for H₂O₂ generation and direct anodic oxidation, an unexplored process, in a vertical bidirectional gas diffusion electrochemical system (VB-GDE). By combining the “reactor” and VB-GDE, we constructed a new platform for selective and nonselective continuous pollutant oxidation in a self-sustaining acidic environment with minimal chemical residues. This work presents a promising electrochemical technology for the efficient and selective removal of water pollutants.

有效和选择性去除水污染物仍然是一个严峻的挑战。在这里，我们通过聚苯胺插层和十二烷基修饰（FeOCl-PS）巧妙地设计了 FeOCl，以提高其原位去除疏水性酚类化合物的活性和选择性，从而解决了这一挑战。我们进一步将催化剂封装在商业廉价刚玉球内，并开发了一种“毫米级反应器”，在十次循环后仍保持86.02%的高效率，物理变化可以忽略不计。此外，我们建立了阳极反应（产生 H ⁺、O ₂和 IrO ₃）和阴极反应（利用 H ⁺和 O ₂）之间的协同作用，以产生 H ₂ O ₂和直接阳极氧化（一种未探索的过程），在垂直双向气体扩散电化学系统（VB-GDE）。通过将“反应器”和VB-GDE相结合，我们构建了一个新的平台，可以在自维持的酸性环境中选择性和非选择性连续污染物氧化，且化学残留最少。这项工作提出了一种有前景的电化学技术，可有效、选择性地去除水污染物。