Ngo-Agasti, oosokhemisti babhengeza ukuba bangenza into ekudala ibonakala ngathi ayinakwenzeka: ukophula ezinye zezinto ezingcolisa izinto eziphilayo ezihlala zihleli phantsi kweemeko ezithambileyo.Izinto ze-Per- kunye ne-polyfluoroalkyl (PFAS), ezihlala zibizwa ngokuba ziikhemikhali zanaphakade, ziqokelelana kwindawo esingqongileyo kunye nemizimba yethu ngesantya esothusayo.Ukuqina kwabo, okumiliselwe kwibhondi ye-carbon-fluorine enzima ukuyophula, kwenza iPFAS ibe luncedo ngakumbi njengokhuko olungangeni manzi kunye nolwelo olungabambekiyo kunye namagwebu omlilo, kodwa oko kuthetha ukuba iikhemikhali ziyaqhubeka kangangeenkulungwane.Amanye amalungu ale klasi inkulu yeekhompawundi aziwa njengetyhefu.
Iqela, elikhokelwa ngusokhemisti weYunivesithi yaseNorthwestern uWilliam Dichtel kunye nomfundi ophumelele isidanga uBrittany Trang, bafumene ubuthathaka kwi-perfluoroalkyl carboxylic acid kunye nekhemikhali iGenX, eyinxalenye yolunye udidi lwePFAS.Ukufudumeza iikhompawundi kwiziqwenga zokunyibilikisa kwiqela leekhemikhali ze-carboxylic acid;ukongezwa kwe-sodium hydroxide kwenza wonke umsebenzi, kushiya ngasemva ii-ion ze-fluoride kunye neeathomu eziphilileyo.Oku kwaphulwa kwebhondi eyomeleleyo ye-C–F inokufezekiswa nje nge-120 °C (iSayensi 2022, i-DOI: 10.1126/science.abm8868).Izazinzulu zinethemba lokuvavanya indlela ngokuchasene nezinye iintlobo zePFAS.
Phambi kwalo msebenzi, ezona zicwangciso zilungileyo zokulungisa i-PFAS yayikukuba zidibanise iikhompawundi okanye ziyophule kumaqondo obushushu aphezulu kakhulu kusetyenziswa amandla amakhulu-anokuthi angasebenzi ngokupheleleyo, utshilo uJennifer Faust, usokhemisti kwiKholeji yaseWooster.“Kungoko le nkqubo yobushushu obuphantsi ithembisa ngokwenene,” utshilo.
Le ndlela entsha yokuqhekeka yamkelwe ngokukodwa kumxholo wezinye iziphumo zowama-2022 malunga nePFAS.Ngo-Agasti, abaphandi beYunivesithi yaseStockholm abakhokelwa ngu-Ian Cousins babika ukuba amanzi emvula emhlabeni jikelele aqukethe i-perfluorooctanoic acid (PFOA) amanqanaba angaphezu kwe-Arhente yoKhuseleko lweNdalo yase-US yenqanaba leengcebiso kuloo khemikhali kumanzi okusela (Environ. Sci. Technol. 2022, DOI: 10.1021 /acs.est.2c02765).Uphononongo lufumene amanqanaba aphezulu enye i-PFAS kumanzi emvula ngokunjalo.
"I-PFOA kunye ne-PFOS [i-perfluorooctanesulfonic acid] iphelile imveliso amashumi eminyaka, ngoko iya kubonisa indlela abazingisa ngayo," kusho uFaust.Andizange ndicinge ukuba kuya kubakho okungako.Uthi, umsebenzi wabazala, "ngokwenene yincam yentaba yomkhenkce."I-Faust ifumene iindidi ezintsha ze-PFAS-ezo zingajongwanga rhoqo yi-EPA-kwi-US yamanzi emvula kwiindawo eziphakamileyo eziphezulu kunezi zixhobo zelifa (Environ. Sci.: Iimpembelelo zeNkqubo 2022, DOI: 10.1039 / d2em00349j).
Ixesha lokuposa: Dec-19-2022