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Improved degradation of diuron herbicide and pesticide wastewater treatment in a three-dimensional electrochemical reactor equipped with PbO2 anodes and granular activated carbon particle electrodes
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2021-09-21 , DOI: 10.1016/j.jclepro.2021.129094
Alireza Rahmani 1 , Mostafa Leili 1 , Abdolmotaleb Seid-mohammadi 1 , Amir Shabanloo 2 , Amin Ansari 3 , Davood Nematollahi 3 , Saber Alizadeh 3
Affiliation  

The electrocatalytic performance of porous carbon felt/PbO2 and planar titanium/PbO2 anodes in a three-dimensional electrochemical reactor (3DER) equipped with granular activated carbon (GAC) particle has been studied for synergistic degradation of diuron herbicide (DIU) and treatment of pesticide wastewater. The results showed that porous carbon felt/PbO2 anode in addition to high stability can provide around three times more surface area than titanium/PbO2 for degradation reactions. Optimization of DIU degradation in 3DER system with carbon felt/PbO2 anode was performed by a five-level rotatable central composite design. The TOC mineralization rate under optimal conditions (pH = 4.7, current density = 13.5 mA cm−2, Na2SO4 concentration = 0.04 M and DIU concentration = 40 mg L−1) for the 3ٍِDER system with carbon felt/PbO2 and titanium/PbO2 anodes after 50 min were 100% and 63.8%, respectively. However, the electrocatalytic efficiency of carbon felt/PbO2 and titanium/PbO2 anodes in the absence of GAC particles to remove TOC was 85.5 and 42.7%, respectively. The energy consumed in the 3DER system equipped with carbon felt/PbO2 anode was 2.28 times less than the 3DER system with titanium/PbO2. The contribution of direct and indirect oxidation of DIU in 3DER degradation systems was determined by radical scavenging technique. The safety of the anodes was evaluated for Pb2+ leakage. The DIU degradation pathway was proposed based on the intermediates identified by LC-MS. The performance of optimized 3DER systems was evaluated for treatment of real pesticide wastewater. The chemical oxygen demand (COD) removal efficiency after 300 min of reaction in the 3DER system with carbon felt/PbO2 and titanium/PbO2 electrodes was 95% and 62.5%, respectively.



中文翻译:

在配备 PbO2 阳极和颗粒活性炭颗粒电极的三维电化学反应器中改进敌草隆除草剂和农药废水处理的降解

多孔碳毡/PbO 2和平面钛/PbO 2阳极在配备颗粒活性炭(GAC)颗粒的三维电化学反应器(3DER)中的电催化性能已被研究用于协同降解敌草隆除草剂(DIU)和处理农药废水。结果表明,多孔碳毡/PbO 2阳极除了具有高稳定性外,还可以为降解反应提供比钛/PbO 2 大三倍的表面积。碳毡/PbO 2 3DER系统中DIU降解的优化阳极采用五级可旋转中央复合设计。最佳条件下(pH = 4.7,电流密度=13.5毫安厘米下的TOC矿化速率-2,钠2 SO 4浓度= 0.04 M和DIU浓度= 40毫克的L -1),用于与碳毡3 DER系统/的PbO 2和50 分钟后,钛/PbO 2阳极分别为 100% 和 63.8%。然而,在不存在 GAC 颗粒的情况下,碳毡/PbO 2和钛/PbO 2阳极去除 TOC的电催化效率分别为 85.5% 和 42.7%。配备碳毡/PbO 2的 3DER 系统消耗的能量阳极比使用钛/PbO 2的 3DER 系统小 2.28 倍。DIU 直接和间接氧化在 3DER 降解系统中的贡献是通过自由基清除技术确定的。针对 Pb 2+泄漏评估了阳极的安全性。基于LC-MS鉴定的中间体提出了DIU降解途径。对优化的 3DER 系统在处理实际农药废水时的性能进行了评估。在碳毡/PbO 2和钛/PbO 2电极的3DER 系统中反应300 分钟后,化学需氧量(COD) 去除效率分别为95% 和62.5%。

更新日期:2021-09-27
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