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Mineralization of perfluorooctanoic acid by combined aerated electrocoagulation and Modified peroxi-coagulation methods
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2021-01-10 , DOI: 10.1016/j.jtice.2021.01.006
Seema Singh , Shang-Lien Lo , Vimal Chandra Srivastava , Qicheng Qiao , Pinki Sharma

Perfluorooctanoic acid (PFOA) is a chemical used for both commercial and industrial applications. It has turned out to be worldwide anxiety owing to its extensive existence in the water bodies and subsequent harmful ecological effects. This study illustrates the significance of hybrid aerated electrocoagulation (EC) and modified peroxi-coagulation (PC) for the PFOA degradation in an aqueous solution. Consumable iron plate electrodes were employed as an electrode pair in both EC and modified PC processes. The laboratory tests were conducted in a batch reactor with a functioning capacity of 1 L. Aeration improved the EC process performance considerably. Higher than 56% PFOA and 38% defluorination occurred after 60 min of electrolysis with EC being operated at a pH of 3.6 and applied a current density of 78.34 Am−2. The performance of the modified PC process was considerably higher than that of the aerated EC process. More than 90% PFOA, 87%total organic carbon (TOC), and 71% deflorination were attained with modified PC process after 60 min of electrolysis operated at 78.34 Am−2 and initial pH of 3.6 when 50 mM hydrogen peroxide (H2O2) was added. The superior performance of the modified PC than aerated EC is mostly owing to the attack of in-site produced OH radicals. PFOA decayed stepwise into small‒chain perfluoro carboxylic acids (PFCAs) and fluoride ions during modified PC oxidation.



中文翻译:

曝气电凝与改良过氧化物混凝法矿化全氟辛酸

全氟辛酸(PFOA)是用于商业和工业应用的化学物质。由于它广泛存在于水体中以及随之而来的有害生态影响,它已成为全世界的焦虑症。这项研究说明了混合充气电凝(EC)和改良的过氧化物凝结(PC)对于水溶液中PFOA降解的重要性。消耗性铁板电极在EC和改进的PC工艺中均用作电极对。实验室测试是在功能为1升的间歇式反应器中进行的。曝气大大提高了EC工艺的性能。电解60分钟后,在pH为3.6的条件下操作EC并施加78.34 Am -2的电流密度后,发生了高于56%的PFOA和38%的脱氟。。改进的PC工艺的性能明显高于充气EC工艺的性能。在78.34 Am -2的电解条件下进行60分钟的电解后,当50 mM过氧化氢(H 2 O)的初始pH为3.6时,采用改良的PC工艺可实现90%以上的PFOA,87%的总有机碳(TOC)和71%的脱花。2)被添加。改性PC优于充气EC的性能主要是由于现场产生的OH 自由基的攻击。在改性的PC氧化过程中,PFOA逐步分解为小链全氟羧酸(PFCA)和氟离子。

更新日期:2021-02-05
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