{"title":"Contact-Electro-Catalysis for the Degradation of Pentachlorophenol Using Inert Fluorinated Ethylene Propylene Powders","authors":"Keyi Li, Yue Lai, Senpei Lin, Lihua Zhou, Minghao He, Huayue Lin, Yong Yuan","doi":"10.1021/acsestengg.4c00284","DOIUrl":null,"url":null,"abstract":"Chlorophenols (CPs) pose significant risks to human health due to their toxicity and carcinogenic properties. The direct oxidative breakdown of CPs can produce even more harmful byproducts, resulting in secondary pollution. There is a pressing need for a technology capable of both reducing and oxidizing CPs for their removal. For this research, we utilized commercially accessible organic polymer fluorinated ethylene propylene (FEP) as a catalyst, activated through ultrasound to kickstart a contact-electro-catalysis process to degrade pentachlorophenol (PCP). A proposed mechanism is presented for the reduction and oxidative breakdown of PCP relying on contact electrification-induced electron transfer that creates reactive species. Experimental findings demonstrate that PCP can be completely degraded with only 1.0 mg of FEP. Experiments on identifying and quenching reactive oxygen species indicate that <sup>•</sup>O<sub>2</sub><sup>−</sup>, <sup>•</sup>OH, and <sup>1</sup>O<sub>2</sub> play a role in the degradation process. The degradation of PCP involves four pathways: direct dechlorination, hydroxylation dechlorination, oxidation, and polymerization. Toxicity assessment reveals that the dechlorination process notably decreases the toxicity of intermediates. Furthermore, characterization and cycling experiments demonstrate the outstanding stability and recyclability of FEP, making it suitable for real environmental water applications. Ultrasound-driven contact-electro-catalysis system offers a straightforward, economical, and eco-friendly approach to degrade PCP. It offers valuable insights for potentially treating stubborn CPs effectively.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS ES&T engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1021/acsestengg.4c00284","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Chlorophenols (CPs) pose significant risks to human health due to their toxicity and carcinogenic properties. The direct oxidative breakdown of CPs can produce even more harmful byproducts, resulting in secondary pollution. There is a pressing need for a technology capable of both reducing and oxidizing CPs for their removal. For this research, we utilized commercially accessible organic polymer fluorinated ethylene propylene (FEP) as a catalyst, activated through ultrasound to kickstart a contact-electro-catalysis process to degrade pentachlorophenol (PCP). A proposed mechanism is presented for the reduction and oxidative breakdown of PCP relying on contact electrification-induced electron transfer that creates reactive species. Experimental findings demonstrate that PCP can be completely degraded with only 1.0 mg of FEP. Experiments on identifying and quenching reactive oxygen species indicate that •O2−, •OH, and 1O2 play a role in the degradation process. The degradation of PCP involves four pathways: direct dechlorination, hydroxylation dechlorination, oxidation, and polymerization. Toxicity assessment reveals that the dechlorination process notably decreases the toxicity of intermediates. Furthermore, characterization and cycling experiments demonstrate the outstanding stability and recyclability of FEP, making it suitable for real environmental water applications. Ultrasound-driven contact-electro-catalysis system offers a straightforward, economical, and eco-friendly approach to degrade PCP. It offers valuable insights for potentially treating stubborn CPs effectively.
期刊介绍:
ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources.
The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope.
Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.