The concentrated liquor of gas field wastewater (CL-GFW) obtained by cryogenic multi-effect distillation is high-concentration organic wastewater. The MgAl-LDH@Fe₃O₄ particles were successfully synthesized as the catalysts of the heterogeneous electro-Fenton (EF) system to effectively degrade refractory organic pollutants in the CL-GFW. The particles broadened the pH range of the EF process under optimal conditions. The highest COD removal efficiency could achieve 88.18% after 4 h with pH of 5. The mesoporous particles were systematically studied via a series of characterization techniques. The heterogeneous degradation mechanisms were explored by radical quenching experiments, variation of H₂O₂ and Fe ion concentrations, and X-ray photoelectron spectroscopy (XPS) analysis. The results indicated that the synergistic effects of the active free radical oxidation, enhanced catalysis, and surface complexation contributed to the degradation of recalcitrant organics in the heterogeneous EF process. Electrocatalysis and homogeneous EF trials exhibited lower COD degradation rates of 45.68% and 62.86% comparing with the heterogeneous EF. The representative refractory organics before and after the heterogeneous EF reaction were identified by GC-MS and HPLC-MS methods. The excellent stability and reusability of the particles in the heterogeneous EF system were verified through five cyclic experiments with low sludge production and metal leaching rate.

低温多效蒸馏得到的气田废水（CL-GFW）浓缩液为高浓度有机废水。成功合成了MgAl-LDH@Fe ₃ O ₄颗粒作为多相电芬顿 (EF) 系统的催化剂，以有效降解 CL-GFW 中的难降解有机污染物。在最佳条件下，颗粒拓宽了 EF 过程的 pH 值范围。在 pH 为 5 的条件下，4小时后 COD 去除率最高可达 88.18% 。通过一系列表征技术系统地研究了介孔颗粒。通过自由基淬灭实验、H ₂ O _{2 的}变化探索了异质降解机制和 Fe 离子浓度，以及 X 射线光电子能谱 (XPS) 分析。结果表明，活性自由基氧化、增强催化和表面络合的协同作用有助于在非均相 EF 过程中降解顽固有机物。与非均相 EF 相比，电催化和均相 EF 试验的 COD 降解率较低，分别为 45.68% 和 62.86%。通过 GC-MS 和 HPLC-MS 方法鉴定了非均相 EF 反应前后的代表性难熔有机物。通过五个低污泥产量和金属浸出率的循环实验验证了非均相 EF 系统中颗粒的优异稳定性和可重复使用性。