Catalytic dechlorination of 1,2-DCA in nano Cu-borohydride system: effects of Cu/Cu ratio, surface poisoning, and regeneration of Cu sites.

Aqueous-phase catalyzed reduction of organic contaminants via zerovalent copper nanoparticles (nCu), coupled with borohydride (hydrogen donor), has shown promising results. So far, the research on nCu as a remedial treatment has focused mainly on contaminant removal efficiencies and degradation mechanisms. Our study has examined the effects of Cu/Cu ratio, surface poisoning (presence of chloride, sulfides, humic acid (HA)), and regeneration of Cu sites on catalytic dechlorination of aqueous-phase 1,2-dichloroethane (1,2-DCA) via nCu-borohydride.

Assessment of PFAS in collocated soil and porewater samples at an AFFF-impacted source zone: Field-scale validation of suction lysimeters.

Per- and polyfluoroalkyl substances (PFAS) measurable in soil porewater authoritatively represent the mobile mass fraction critical to accurate assessment of leaching from source zones. This study evaluated PFAS occurrence in lysimeter-collected porewater samples for two depth intervals at a decades-old aqueous film-forming foam (AFFF)-impacted field site quarterly for a year. Notably, site-wide Log (∑PFAS) concentrations did not significantly differ among sampling events despite highly variable sample yields due to a heterogeneous and dynamic soil moisture regime.

Mechanochemical remediation of perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) amended sand and aqueous film-forming foam (AFFF) impacted soil by planetary ball milling.

Per- and polyfluoroalkyl substances (PFAS) are manmade, fluorinated organic chemicals which have been identified as persistent organic pollutants. PFAS have surface active properties that have made them suitable for applications in oil- and water-resistant products, as well as many firefighting foams. No on-site remediation strategies exist to treat PFAS impacted soils.