全氟辛酸
氧化剂
降级(电信)
污染物
化学
环境化学
肺表面活性物质
环境修复
污染
化学工程
有机化学
电信
生态学
生物化学
计算机科学
工程类
生物
作者
Mubbshir Saleem,Giulia Tomei,Matteo Beria,Ester Marotta,Cristina Paradisi
出处
期刊:Chemosphere
[Elsevier]
日期:2022-11-01
卷期号:307: 135800-135800
被引量:13
标识
DOI:10.1016/j.chemosphere.2022.135800
摘要
Atmospheric plasma offers a viable approach to new water remediation technologies, best suited for the degradation of persistent organic pollutants such as PFAS, per- and polyfluoroalkyl substances. This paper reports on the remarkable performance of a novel RAdial Plasma (RAP) discharge reactor in treating water contaminated with PFAS surfactants, notably the ubiquitous perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). RAP proved to be versatile and robust, performing very well over a wide range of pollutants concentrations. Thus, PFOA degradation was most satisfactory with regard to all critical indicators, kinetics (≥99% PFOA conversion in less than 2.5 min and 30 min in solutions with initial concentrations of 41 μg/L and 41 mg/L, respectively), byproducts, and energy efficiency (G50 greater than 2000 mg/kWh for 41 μg/L - 4.1 mg/L PFOA initial concentrations). Likewise for PFOS as well as for Triton X-100, a common fluorine-free non-ionic surfactant tested to explore the scope of applicability of RAP to the degradation of surfactants in general. The results obtained with RAP compare most favourably with those reported for state-of-art plasma systems in similar experiments. RAP's excellent performance is attributed to the dense network of radial discharges it generates, randomly spread over the entire exposed surface of the liquid thus establishing an extended highly reactive plasma-liquid interface with both strongly reducing and oxidizing species. Mechanistic insight is offered based on the observed degradation products and on available literature data on the surfactants properties and on their plasma induced degradation investigated in previous studies.
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