期刊
ELECTROCHIMICA ACTA
卷 344, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136146
关键词
Reactive oxygen species; Scavenger; Methylene blue; Degradation pathway; Density functional theory
资金
- Higher Education Quality Enhancement Project of the Ministry of Education, Government of the People's Republic of Bangladesh [CPSF 231, CP 2196]
Although electrochemical oxygen reduction reaction (ORR) at glassy carbon (GC) electrode in aqueous solution involves the generation of several reactive oxygen species (ROS; e.g., O2, H2O2, OH) the formation of hydroxyl radicals (OH) is generally associated with the degradation of persistent organic contaminants in water. In this study, the route of degradation of a model organic dye, methylene blue (MB), by ROS at a GC electrode in aqueous solution is extensively investigated by employing a variety of radical scavengers such as 1,4-benzoquinone for O2 , horseradish peroxidase for H2O2, and iso-propanol for OH radicals using cyclic voltammetric technique. In addition to that effect of Fe(II) solution which facilitates the decomposition of H2O2 was also explored to generate more OH radicals. Among the scavengers of ROS studied mainly iso-propanol inhibits the following chemical reaction, i.e., OH radical produced in ORR from O2 through the consumption of electron was found to be the active radical for the degradation of MB. The mode of reaction of MB with ROS was further clarified by analyzing characteristics of the reaction mixture and products formed during bulk electrolysis that was carried by applying a constant potential at GC plate electrode. The pH of the solution decreased upon degradation and caused a consequent increase in conductivity. The experimental FT-IR spectrum of the degraded products were compared with theoretical ones for probable fragments of MB constructed using density functional theory (DFT) and the degraded products were identified as protonated amine residues. (c) 2020 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据