Presentation Title

Structural-Reactivity Relationship for Reductive Defluorination of Per-and Polyfluoroalkyl Substances (PFASs) with Hydrated Electrons

Faculty Mentor

Bryan Wong, Yujie Men, Jinyong Liu*

Start Date

23-11-2019 12:30 PM

End Date

23-11-2019 12:45 PM

Location

Markstein 101

Session

oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Since 1940s, per- and polyfluoroalkyl substances (PFASs) have displayed unique properties and thus played significant roles in the production of many consumer products. Their toxicity and extreme recalcitrance towards natural degradation have caused significant environmental pollution. Considerable efforts have been directed towards developing technologies for PFASs treatment. Current remediation relies on physical separation such as activated carbon sorption and membrane filtration. However, physically separated PFAS waste is still under the risk of potential reintroduction into the environment. Recently, a reduction process using hydrated electrons (eaq) as the reductant has demonstrated high promise for the chemical destruction of PFASs. Previous studies on PFAS treatment have mainly focused on perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). This study significantly expanded the scope of PFAS structures, and found that structural characteristics, such as fluoroalkyl chain length (CnF2n+1, n = number of fluoro-carbon), head functional group (-COOH, -SO3H, ), and organic moieties (-CH2CH2-) can significantly impact treatment efficiency. Experimental results have been correlated with transformation product analyses and computational studies. This work provides a comprehensive understanding of structural dependence and several critical reaction mechanisms towards PFAS treatment by reductive approaches.

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Nov 23rd, 12:30 PM Nov 23rd, 12:45 PM

Structural-Reactivity Relationship for Reductive Defluorination of Per-and Polyfluoroalkyl Substances (PFASs) with Hydrated Electrons

Markstein 101

Since 1940s, per- and polyfluoroalkyl substances (PFASs) have displayed unique properties and thus played significant roles in the production of many consumer products. Their toxicity and extreme recalcitrance towards natural degradation have caused significant environmental pollution. Considerable efforts have been directed towards developing technologies for PFASs treatment. Current remediation relies on physical separation such as activated carbon sorption and membrane filtration. However, physically separated PFAS waste is still under the risk of potential reintroduction into the environment. Recently, a reduction process using hydrated electrons (eaq) as the reductant has demonstrated high promise for the chemical destruction of PFASs. Previous studies on PFAS treatment have mainly focused on perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). This study significantly expanded the scope of PFAS structures, and found that structural characteristics, such as fluoroalkyl chain length (CnF2n+1, n = number of fluoro-carbon), head functional group (-COOH, -SO3H, ), and organic moieties (-CH2CH2-) can significantly impact treatment efficiency. Experimental results have been correlated with transformation product analyses and computational studies. This work provides a comprehensive understanding of structural dependence and several critical reaction mechanisms towards PFAS treatment by reductive approaches.