Fe-Mt三维粒子电极体系去除水中亚甲基蓝

以铁改性蒙脱石(Fe-Mt)制备粒子电极，探究了其在三维电极体系中的催化性能。通过SEM-EDS和XRD对Fe-Mt粒子电极进行了形貌和物相表征，分析了不同反应条件(pH、投加量、槽电压等)对亚甲基蓝去除率的影响，进一步通过自由基抑制实验、H₂O₂的产生量以及总溶解性铁离子浓度检测探讨了Fe-Mt粒子电极对亚甲基蓝的氧化去除机理。结果表明，Fe-Mt粒子电极能够拓宽pH的有效作用范围，在pH=3.0、电压为5 V、粒子电极投加量为10 g∙L⁻¹条件下，较二维电化学体系亚甲基蓝去除率提高了约25%。Fe-Mt粒子电极能够直接或间接催化H₂O₂以产生羟基自由基，并结合吸附-氧化降解耦合机制强化了亚甲基蓝去除率。以上研究结果可为拓宽以蒙脱石为基材的催化材料在高级氧化体系的应用提供参考。

Removal of methylene blue from water by Fe-Mt three-dimensional particle electrode system

In this study, iron-modified montmorillonite (Fe-Mt) was used to prepare the particle electrode, and its catalytic performance in three-dimensional electrode system was systematically investigated. The morphology and phase characteristics of Fe-Mt particle electrode were characterized by SEM-EDS and XRD, respectively, and the effects of different reaction conditions (pH, particle electrode dosage and cell voltage etc.) on the removal efficiency of methylene blue were analyzed. Furthermore, the mechanism of methylene blue oxidative removal by Fe-Mt particle electrode was discussed through free radical scavenging experiments, H2O2 production amount and total soluble iron ion concentration detection. The results showed that the Fe-Mt particle electrode can broaden the effective range of pH, and the removal efficiency of methylene blue increased by about 25% compared with the two-dimensional electrochemical system at pH 3.0, voltage of 5 V and particle electrode dosage of 10 g∙L−1. The Fe-Mt particle electrode can directly or indirectly catalyze H2O2 to generate hydroxyl radicals, and combined with the coupling mechanism of adsorption-oxidative degradation to enhance the methylene blue removal efficiency. This study can provide a reference for broadening the application of montmorillonite-based catalytic materials in advanced oxidation systems.