Search Result
Technology Innovation News Survey Feed (RSS)
ALUMINA-MEDIATED MECHANOCHEMICAL METHOD FOR SIMULTANEOUSLY DEGRADING PERFLUOROOCTANOIC ACID AND SYNTHESIZING A POLYFLUOROALKENE
Lv, H., N. Wang, L. Zhu, Y. Zhou, W. Li, and H. Tang.
Green Chemistry 20(11):2526-2533(2018)
Researchers developed an alumina-mediated solid-state mechanochemical (MC) method to simultaneously degrade PFOA and synthesize 1H-perfluorohept-ene (1H-1-PFHp), which is a valuable organofluorine block. A 2.5-h MC treatment resulted in nearly complete removal (99.4%) of PFOA and a high yield (92.5%) of 1H-1-PFHp. In this transformation, the surface hydroxyl groups on alumina are critical for anchoring the PFOA molecules during the defluorination reaction, and the milling process promotes the dehydration of alumina to produce reactive Lewis acid sites for activating the C-F bonds. High-energy ball milling initiates simultaneously the release of lattice oxygen from alumina, producing oxygen vacancies (in alumina) and free electrons, the latter of which can induce the breakage of C-F bonds via a reductive pathway. The combination of the mechanocaloric effect and the triple roles of alumina drive PFOA to a controlled defluorination.
Green Chemistry 20(11):2526-2533(2018)
Researchers developed an alumina-mediated solid-state mechanochemical (MC) method to simultaneously degrade PFOA and synthesize 1H-perfluorohept-ene (1H-1-PFHp), which is a valuable organofluorine block. A 2.5-h MC treatment resulted in nearly complete removal (99.4%) of PFOA and a high yield (92.5%) of 1H-1-PFHp. In this transformation, the surface hydroxyl groups on alumina are critical for anchoring the PFOA molecules during the defluorination reaction, and the milling process promotes the dehydration of alumina to produce reactive Lewis acid sites for activating the C-F bonds. High-energy ball milling initiates simultaneously the release of lattice oxygen from alumina, producing oxygen vacancies (in alumina) and free electrons, the latter of which can induce the breakage of C-F bonds via a reductive pathway. The combination of the mechanocaloric effect and the triple roles of alumina drive PFOA to a controlled defluorination.
The Technology Innovation News Survey welcomes your comments and
suggestions, as well as information about errors for correction. Please
contact Michael Adam of the U.S. EPA Office of Superfund Remediation
and Technology Innovation at adam.michael@epa.gov or (703) 603-9915
with any comments, suggestions, or corrections.
Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.
