Fe-Mt三维粒子电极体系去除水中亚甲基蓝  

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

作　　者：杜可清 李俊峰[1,2] 魏西鹏 宋东宝 陈翠忠 魏震 DU Keqing;LI Junfeng;WEI Xipeng;SONG Dongbao;CHEN Cuizhong;WEI Zhen(College of Water Conservancy and Architecture Engineering,Shihezi University,Shihezi 832003,China;Key Laboratory of Modern Water Saving Irrigation Corps,Shihezi 832000,China;College of Environment and Energy of South China University of Technology,Guangzhou 510641,China)

机构地区：[1]石河子大学水利建筑工程学院,石河子832003 [2]现代节水灌溉兵团重点实验室,石河子832000 [3]华南理工大学环境与能源学院,广州510641

出　　处：《环境工程学报》2020年第12期3417-3425,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金重点项目-新疆联合基金项目(U1803244);国家重点研发计划(2017YFC0404304);兵团重点领域科技攻关计划(2019AB035);石河子大学青年创新培育人才项目(CXPY201902)。

摘　　要：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。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.

关 键 词：蒙脱石 三维粒子电极 亚甲基蓝 电化学体系 去除机理 

分 类 号：X703[环境科学与工程—环境工程]