期刊
CHEMICAL ENGINEERING JOURNAL
卷 403, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126278
关键词
Sulfate radical; Electrolysis; UV/sulfite; Decontamination; Disinfection
资金
- US National Institute of Environmental Health Sciences of the National Institute of Health [P42ES017198]
A metal-free and highly efficient electro/UV/sulfite process was developed to produce sulfate radical (SO4^·-) for water treatment. This process effectively removes micropollutants and Escherichia coli from synthetic and natural water matrices.
Sulfite as a precursor to generate sulfate radical (SO4 center dot-) for water treatment has gained attention. Here we report a metal-free and highly efficient electro/UV/sulfite process to produce SO4 center dot- for water treatment. UV/sulfite reaction induces sulfite radical (SO3 center dot-), which is transformed into SO4 center dot- by the presence of oxygen due to water electrolysis. Electro/UV/sulfite process generates a steady-state SO4 center dot- concentration of 0.2 to 1.1 x 10(-12) M in our tests. Solution pH affects sulfite species distribution, and higher pH mediates improved yield of steady-state SO4 center dot- concentration. Effect of sulfite concentration exhibits a bell-shaped pattern toward SO4 center dot- production due to self-scavenging. The oxidation capability of electro/UV/sulfite process is manifested by removing representative micropollutants (i.e., ibuprofen, salicylic acid, and bisphenol A) and Escherichia coli model pathogen, in both synthetic and natural water matrices. This novel electro/UV/sulfite process has obvious advantages, since it avoids metal ion catalysts, supplies reaction with electrolytically generated nascent oxygen, and overcomes the acidic pH requirement, that are challenging to traditional metal/sulfite processes. Considering the features of environmental friendliness and low cost, the proposed electro/UV/sulfite process should lead to successful applications in the future.
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