使用含有 C-碳纳米管复合材料的阴极进行三氟丙嗪的光辅助电化学消除。
Photo-assisted electrochemical abatement of trifluralin using a cathode containing a C-carbon nanotubes composite.
机构信息
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
出版信息
Chemosphere. 2018 May;199:510-523. doi: 10.1016/j.chemosphere.2018.02.061. Epub 2018 Feb 9.
This work reports the potential application of modified gas-diffusion electrode (GDE) with C-CNT composite, as a stable and efficient cathode material for degradation of trifluralin (TRL) pesticide by photo-assisted electrochemical (PE) process. C-CNT composite was prepared and characterized. Subsequently, a novel C-CNT composite modified GDE cathode was developed and the electrochemical and physical characteristics of the modified GDEs were studied. C-CNT composite/GDE showed great efficiencies for electro-generating HO, owing to huge surface area and high conductivity. Afterwards, a comparative study of TRL oxidation via photolysis, anodic oxidation (AO) and PE processes using C-CNT composite/GDE revealed the degradation percentages of 42.2, 48.5 and 93.4%, respectively, after 180 min of treatment. The TRL degradation followed a pseudo-first-order kinetics, being faster in the order: photolysis < AO < PE. The effects of various operational conditions were assessed on the degradation of TRL. From the results, PE process using C-CNT composite/GDE exhibited great performance for the degradation of TRL (20 mg L) under its original pH, NaSO electrolyte concentration of 0.05 mol L, applied current intensity of 300 mA, and flow rate of 12.5 L h. TOC results displayed that 92.8% of TRL was mineralized after 8 h of PE process. In addition, a plausible pathway for mineralization of TRL was proposed according to the identified by-products detected by means of gas chromatography-mass spectroscopy (GC-MS), High-performance liquid chromatography (HPLC) and ion chromatography analyses.
这项工作报告了改性气体扩散电极（GDE）与 C-CNT 复合材料在光助电化学（PE）过程中降解三氟拉林（TRL）农药方面的潜在应用。制备并表征了 C-CNT 复合材料。随后，开发了一种新型 C-CNT 复合材料改性 GDE 阴极，并研究了改性 GDE 的电化学和物理特性。由于巨大的表面积和高导电性，C-CNT 复合材料/GDE 对电生成 HO 的效率很高。随后，通过光解、阳极氧化（AO）和使用 C-CNT 复合材料/GDE 的 PE 过程对 TRL 氧化进行了比较研究，结果表明，在 180 分钟的处理后，分别有 42.2%、48.5%和 93.4%的 TRL 发生了降解。TRL 降解遵循准一级动力学，顺序为：光解<AO<PE。评估了各种操作条件对 TRL 降解的影响。结果表明，在原始 pH 值、0.05 mol/L 的 NaSO 电解质浓度、300 mA 的施加电流强度和 12.5 L/h 的流速下，使用 C-CNT 复合材料/GDE 的 PE 工艺对 TRL（20 mg/L）的降解表现出良好的性能。TOC 结果显示，PE 工艺 8 小时后 TRL 的矿化率达到 92.8%。此外，根据气相色谱-质谱（GC-MS）、高效液相色谱（HPLC）和离子色谱分析检测到的中间产物，提出了 TRL 矿化的可能途径。
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