Removal of methylene blue from water by Fe-Mt three-dimensional particle electrode system
DU Keqing1,, LI Junfeng1,2,,, WEI Xipeng3, SONG Dongbao1, CHEN Cuizhong1, WEI Zhen1 1.College of Water Conservancy and Architecture Engineering, Shihezi University, Shihezi 832003, China 2.Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi 832000, China 3.College of Environment and Energy of South China University of Technology, Guangzhou 510641, China
Abstract: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. Key words:montmorillonite/ three-dimensional particle electrode/ methylene blue/ electrochemical system/ removal mechanism.
图1Fe-Mt三维电极反应装置图 Figure1.Diagram of Fe-Mt three-dimensional electrode reaction device
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1.College of Water Conservancy and Architecture Engineering, Shihezi University, Shihezi 832003, China 2.Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi 832000, China 3.College of Environment and Energy of South China University of Technology, Guangzhou 510641, China Received Date: 2020-01-12 Accepted Date: 2020-06-18 Available Online: 2020-12-08 Keywords:montmorillonite/ three-dimensional particle electrode/ methylene blue/ electrochemical system/ removal mechanism Abstract: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.