Quantifying Hydrated Electron Transformation Kinetics in UV-Advanced Reduction Processes Using the R_(e-,uv)Method

Benjamin D.Fennell; Adam Odorisio; Garrett McKay

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Quantifying Hydrated Electron Transformation Kinetics in UV-Advanced Reduction Processes Using the R_(e-,uv)Method

机译：Quantifying Hydrated Electron Transformation Kinetics in UV-Advanced Reduction Processes Using the R_(e-,uv)Method

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Ultraviolet advanced reduction processes(UV-ARP)have garnered significant attention recently for the degradation of several hard to treat contaminants,including recalcitrant per-and polyfluoroalkyl substances(PFAS).The rate of contaminant degradation in UV-ARP is directly related to the available hydrated electron concentration([e_(eq)~-]).However,reports of [e_(eq)~-] and other parameters typically used to characterize photochemical systems are not widely reported in the UV-ARP literature.Deploying monochlor-oacetate as a probe compound,we developed a method(R_(e-,uv))to quantify the time-based hydrated electron concentration([e_(eq)],)available for contaminant degradation relative to inputted UV fluence.Measured [e_(eq)],was then used to understand the impact of e_(eq)~-rate of formation and scavenging capacity on the degradation of two contaminants-nitrate and perfluorooctane sulfonate(PFOS)-in four source waters with varying background water quality.The results show that the long-term treatability of PFOS by UV-ARP is not significantly impacted by the initial _(eq)~-scavenging conditions but rather is influenced by the presence of e_(eq)~-scavengers like dissolved organic carbon and bicarbonate.Lastly,using [e_(eq)]t degradation of nitrate and PFOS was modeled in the source waters.We demonstrate that the R_(e-,uv)method provides an effective tool to assess UV-ARP treatment performance in a variety of source waters.

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《Environmental Science & Technology: ES&T》 |2022年第14期|10329-10338|共10页
作者
Benjamin D.Fennell; Adam Odorisio; Garrett McKay;
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作者单位

Zaehry Department of Civil & Environmental Engineering Texas A&M University,College Station,Texas 7784S,United States;

Zachry Department of Civil & Environmental Engineering Texas A&M University,College Station,Texas 7784S,United States;

Zachry Department of Civil & Environmental Engineering,Texas A&M University,College Station,Texas 7784S,United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
hydrated electron; PFAS; PFOS; nitrate; UV-ARP; monochloroacetate; scavenging capacity;

Quantifying Hydrated Electron Transformation Kinetics in UV-Advanced Reduction Processes Using the R_(e-,uv)Method

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