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Photoelectro-Fenton system including electromagnetic induction electrodeless lamp and black carbon poly tetra fluoro ethylene air-diffusion cathode: Degradation kinetics, intermediates and pathway for azo dye.
Chemosphere ( IF 8.1 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.chemosphere.2020.126708 Jijie Kong 1 , Wen Huang 1 , Shaogui Yang 2 , Huan He 2 , Cheng Sun 1 , Qiming Xian 1 , Dong Jiang 3
Chemosphere ( IF 8.1 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.chemosphere.2020.126708 Jijie Kong 1 , Wen Huang 1 , Shaogui Yang 2 , Huan He 2 , Cheng Sun 1 , Qiming Xian 1 , Dong Jiang 3
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The role of illumination and cathode is important to improve the efficiency of photoelectro-Fenton (PEF) system. In this study, cathodes with black carbon-poly tetra fluoro ethylene (BC-PTFE) for increase the concentration of hydrogen peroxide in PEF. A new PEF system using EIEL and BC-PTFE air-diffusion cathode was established. The electrode performance was tested and the influence factors, degradation kinetics, intermediates, pathway and mechanism of the model compound methyl orange (MO) were studied. The capacities of concentration decays and total organic carbon (TOC) removals were compared between different electrochemical advanced oxidation processes. The experimental conditions were optimized for a current density of 20 mA cm-2 with 0.5 mM Fe2+ and 100 mg L-1 MO at 20 °C and pH 3.0 in an 8 L reservoir. The higher MO concentration was, the smaller pseudo-first-order kinetic constants of concentration decays and TOC removals were. Intermediate products were identified by gas chromatography-mass spectrometry and ion-exclusion high performance liquid chromatograph in EIEL-PEF. Combined with frontier electron density, the degradation pathway was deduced as follows: destruction of azo bond, substitution of •OH, dehydrogenation and oxidation, opening-ring and mineralization. In EIEL-PEF, the concentration of oxalic acid and oxamic acid reached the maximum value 9.2 and 1.5 mg L-1 at 60 and 90 min, respectively. The photolysis of N-intermediates produced NH4+-N was released in more proportion than NO3--N and oxamic acid-N. The study indicated that PEF system has the potential to remove organic pollutants in aquatic environments.
中文翻译：
包括电磁感应无极灯和黑碳聚四氟乙烯空气扩散阴极的光电芬顿系统：偶氮染料的降解动力学，中间体和途径。
照明和阴极的作用对于提高光电芬顿（PEF）系统的效率很重要。在这项研究中，使用黑色碳-聚四氟乙烯（BC-PTFE）制成的阴极可增加PEF中过氧化氢的浓度。建立了使用EIEL和BC-PTFE空气扩散阴极的新型PEF系统。测试了电极性能，研究了模型化合物甲基橙（MO）的影响因素，降解动力学，中间体，途径和机理。比较了不同电化学高级氧化工艺之间的浓度衰减能力和总有机碳（TOC）去除能力。针对8 L储罐中20°C和pH 3.0时0.5 mM Fe2 +和100 mg L-1 MO的20 mA cm-2电流密度优化了实验条件。MO浓度越高，浓度衰减和TOC去除的伪一阶动力学常数较小。通过气相色谱-质谱法和离子排斥高效液相色谱仪在EIEL-PEF中鉴定中间产物。结合前沿电子密度，可以推导降解途径如下：破坏偶氮键，取代•OH，脱氢和氧化，开环和矿化。在EIEL-PEF中，草酸和草酰胺酸的浓度分别在60分钟和90分钟时达到最大值9.2和1.5 mg L-1。N中间体产生的NH4 + -N的光解比NO3--N和草酰胺酸-N释放的比例更大。研究表明，PEF系统具有去除水生环境中有机污染物的潜力。
更新日期：2020-04-08
中文翻译：
包括电磁感应无极灯和黑碳聚四氟乙烯空气扩散阴极的光电芬顿系统：偶氮染料的降解动力学，中间体和途径。
照明和阴极的作用对于提高光电芬顿（PEF）系统的效率很重要。在这项研究中，使用黑色碳-聚四氟乙烯（BC-PTFE）制成的阴极可增加PEF中过氧化氢的浓度。建立了使用EIEL和BC-PTFE空气扩散阴极的新型PEF系统。测试了电极性能，研究了模型化合物甲基橙（MO）的影响因素，降解动力学，中间体，途径和机理。比较了不同电化学高级氧化工艺之间的浓度衰减能力和总有机碳（TOC）去除能力。针对8 L储罐中20°C和pH 3.0时0.5 mM Fe2 +和100 mg L-1 MO的20 mA cm-2电流密度优化了实验条件。MO浓度越高，浓度衰减和TOC去除的伪一阶动力学常数较小。通过气相色谱-质谱法和离子排斥高效液相色谱仪在EIEL-PEF中鉴定中间产物。结合前沿电子密度，可以推导降解途径如下：破坏偶氮键，取代•OH，脱氢和氧化，开环和矿化。在EIEL-PEF中，草酸和草酰胺酸的浓度分别在60分钟和90分钟时达到最大值9.2和1.5 mg L-1。N中间体产生的NH4 + -N的光解比NO3--N和草酰胺酸-N释放的比例更大。研究表明，PEF系统具有去除水生环境中有机污染物的潜力。
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