Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances
Reductive water treatment using hydrated electrons (eaq−) is a promising technology to destruct perfluoroalkyl substances; however, it faces challenges of slow reaction kinetics, undesirable chemical addition, and high energy consumption. Herein, we developed a hydrogen (H2)-polarized water photolys...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Journal of Hazardous Materials Letters |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666911022000259 |
| _version_ | 1811201770774331392 |
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| author | Gongde Chen Sitao Liu Qingyang Shi Jay Gan Bosen Jin Yujie Men Haizhou Liu |
| author_facet | Gongde Chen Sitao Liu Qingyang Shi Jay Gan Bosen Jin Yujie Men Haizhou Liu |
| author_sort | Gongde Chen |
| collection | DOAJ |
| description | Reductive water treatment using hydrated electrons (eaq−) is a promising technology to destruct perfluoroalkyl substances; however, it faces challenges of slow reaction kinetics, undesirable chemical addition, and high energy consumption. Herein, we developed a hydrogen (H2)-polarized water photolysis system using vacuum UV (VUV) light at 185 nm for reductive destruction of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). The 185-nm photons directly photolyzed H2O and OH- into HO·, H·, and eaq−. H2 elevated the quasi steady-state concentration of eaq− 18 times in untuned VUV systems through eliminating the scavenging effect of dissolved oxygen and converting hydroxyl radicals (HO·/O·-) into eaq−. The polarization effect of H2 increased the degradation of PFOA from 10 % to 95 % and the defluorination from 17 % to 94 % and led to 87 % of defluorination for PFOS. The pH impacted VUV photon adsorption between H2O and OH- and shifted the equilibrium between H· and eaq−, which led to an optimal pH of 10.3 for PFOA destruction. The presence of chloride and sulfate enhanced the production of eaq− and promoted PFOA destruction. H2-polarized VUV water photolysis systems produced high levels of eaq− from clean water constituents and significantly reduced energy consumption for PFAS treatment under mild alkaline conditions. |
| first_indexed | 2024-04-12T02:27:31Z |
| format | Article |
| id | doaj.art-266bab89578342ae853a9026ac56b007 |
| institution | Directory Open Access Journal |
| issn | 2666-9110 |
| language | English |
| last_indexed | 2024-04-12T02:27:31Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hazardous Materials Letters |
| spelling | doaj.art-266bab89578342ae853a9026ac56b0072022-12-22T03:51:56ZengElsevierJournal of Hazardous Materials Letters2666-91102022-11-013100072Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substancesGongde Chen0Sitao Liu1Qingyang Shi2Jay Gan3Bosen Jin4Yujie Men5Haizhou Liu6Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA; Corresponding authors.Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USADepartment of Environmental Sciences, University of California, Riverside, CA 92521, USADepartment of Environmental Sciences, University of California, Riverside, CA 92521, USADepartment of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USADepartment of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USADepartment of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA; Corresponding authors.Reductive water treatment using hydrated electrons (eaq−) is a promising technology to destruct perfluoroalkyl substances; however, it faces challenges of slow reaction kinetics, undesirable chemical addition, and high energy consumption. Herein, we developed a hydrogen (H2)-polarized water photolysis system using vacuum UV (VUV) light at 185 nm for reductive destruction of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). The 185-nm photons directly photolyzed H2O and OH- into HO·, H·, and eaq−. H2 elevated the quasi steady-state concentration of eaq− 18 times in untuned VUV systems through eliminating the scavenging effect of dissolved oxygen and converting hydroxyl radicals (HO·/O·-) into eaq−. The polarization effect of H2 increased the degradation of PFOA from 10 % to 95 % and the defluorination from 17 % to 94 % and led to 87 % of defluorination for PFOS. The pH impacted VUV photon adsorption between H2O and OH- and shifted the equilibrium between H· and eaq−, which led to an optimal pH of 10.3 for PFOA destruction. The presence of chloride and sulfate enhanced the production of eaq− and promoted PFOA destruction. H2-polarized VUV water photolysis systems produced high levels of eaq− from clean water constituents and significantly reduced energy consumption for PFAS treatment under mild alkaline conditions.http://www.sciencedirect.com/science/article/pii/S2666911022000259Vacuum UVPFASDestructionWater ionizationDefluorination |
| spellingShingle | Gongde Chen Sitao Liu Qingyang Shi Jay Gan Bosen Jin Yujie Men Haizhou Liu Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances Journal of Hazardous Materials Letters Vacuum UV PFAS Destruction Water ionization Defluorination |
| title | Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances |
| title_full | Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances |
| title_fullStr | Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances |
| title_full_unstemmed | Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances |
| title_short | Hydrogen-polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances |
| title_sort | hydrogen polarized vacuum ultraviolet photolysis system for enhanced destruction of perfluoroalkyl substances |
| topic | Vacuum UV PFAS Destruction Water ionization Defluorination |
| url | http://www.sciencedirect.com/science/article/pii/S2666911022000259 |
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