Contact-Electro-Catalysis for the Degradation of Pentachlorophenol Using Inert Fluorinated Ethylene Propylene Powders

IF 7.4 Q1 ENGINEERING, ENVIRONMENTAL ACS ES&T engineering Pub Date : 2024-07-22 DOI:10.1021/acsestengg.4c00284
Keyi Li, Yue Lai, Senpei Lin, Lihua Zhou, Minghao He, Huayue Lin, Yong Yuan
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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.

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利用惰性氟化乙丙粉末的接触电催化技术降解五氯苯酚
氯酚(CP)具有毒性和致癌性,对人类健康构成重大威胁。氯化石蜡的直接氧化分解会产生更加有害的副产品,造成二次污染。因此,迫切需要一种既能还原又能氧化的技术来清除氯化石蜡。在这项研究中,我们利用市场上可买到的有机聚合物氟化乙烯丙烯(FEP)作为催化剂,通过超声波激活,启动接触电催化过程降解五氯苯酚(PCP)。该研究提出了五氯苯酚的还原和氧化分解机理,即依靠接触电化诱导的电子传递产生活性物种。实验结果表明,只需 1.0 毫克的 FEP 就能完全降解五氯苯酚。识别和淬灭活性氧的实验表明,-O2-、-OH 和 1O2 在降解过程中发挥了作用。五氯苯酚的降解包括四种途径:直接脱氯、羟化脱氯、氧化和聚合。毒性评估显示,脱氯过程可显著降低中间产物的毒性。此外,表征和循环实验证明了 FEP 出色的稳定性和可回收性,使其适用于实际的环境用水应用。超声波驱动的接触电催化系统为降解五氯苯酚提供了一种直接、经济和环保的方法。它为有效处理顽固的氯化石蜡提供了宝贵的见解。
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来源期刊
ACS ES&T engineering
ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-
CiteScore
8.50
自引率
0.00%
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0
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.
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