Polyethylene terephthalate (PET), monga polyester yofunika kwambiri ya thermoplastic, imapangidwa padziko lonse lapansi chaka chilichonse kuposa matani 70 miliyoni ndipo imagwiritsidwa ntchito kwambiri popanga chakudya cha tsiku ndi tsiku, nsalu, ndi zina. Komabe, kumbuyo kwa kuchuluka kwakukulu kwa kupanga kumeneku, pafupifupi 80% ya zinyalala za PET zimatayidwa kapena kudzazidwa m'nthaka, zomwe zimayambitsa kuipitsidwa kwakukulu kwa chilengedwe ndikupangitsa kuti zinthu zambiri za kaboni ziwonongeke. Momwe mungakwaniritsire kubwezeretsanso zinyalala za PET kwakhala vuto lalikulu lomwe likufunika kupita patsogolo kuti chitukuko chokhazikika padziko lonse lapansi chikhale chokhazikika.
Pakati pa ukadaulo wobwezeretsanso zinthu womwe ulipo, ukadaulo wokonzanso zinthu pogwiritsa ntchito photoreform wakopa chidwi chachikulu chifukwa cha mawonekedwe ake obiriwira komanso ofatsa. Njirayi imagwiritsa ntchito mphamvu ya dzuwa yoyera, yosaipitsa ngati mphamvu yoyendetsera, kupanga mitundu yogwira ntchito ya redox yomwe ili pamalo pomwe kutentha ndi kupanikizika zimasinthasintha kuti zithandize kusintha ndi kukweza phindu la mapulasitiki otayira. Komabe, zinthu zomwe zimagwiritsidwa ntchito popanga photoreforming pakadali pano zimangokhala ndi zinthu zosavuta zokhala ndi mpweya monga formic acid ndi glycolic acid.
Posachedwapa, gulu lofufuza kuchokera ku Center for Photochemical Conversion and Synthesis ku bungwe lina ku China linapereka lingaliro logwiritsa ntchito zinyalala za PET ndi ammonia ngati magwero a kaboni ndi nayitrogeni, motsatana, kuti apange formamide kudzera mu photocatalytic CN coupling reaction. Pofuna kukwaniritsa izi, ofufuzawo adapanga photocatalyst ya Pt1Au/TiO2. Mu catalyst iyi, malo a single-atom Pt amasankha ma elekitironi opangidwa ndi photocatalytic, pomwe ma nanoparticles a Au amagwira mabowo opangidwa ndi photocatalytic, zomwe zimawonjezera kwambiri kulekanitsa ndi kusamutsa bwino kwa ma electron-hole awiri opangidwa ndi photocatalytic, motero zimawonjezera ntchito ya photocatalytic. Chiŵerengero cha kupanga formamide chinafika pafupifupi 7.1 mmol gcat⁻¹ h⁻¹. Mayeso monga in-situ infrared spectroscopy ndi electron paramagnetic resonance adavumbulutsa njira yochitira zinthu mopitirira muyeso: mabowo opangidwa ndi photocatalytic nthawi imodzi amawonjezera ethylene glycol ndi ammonia, ndikupanga aldehyde intermediates ndi amino radicals (·NH₂), zomwe zimadutsa CN coupling kuti pamapeto pake zipange formamide. Ntchitoyi sikuti imangoyambitsa njira yatsopano yosinthira zinyalala zamtengo wapatali, kukulitsa mitundu yosiyanasiyana ya zinthu zosinthira PET, komanso imapereka njira yobiriwira, yotsika mtengo, komanso yodalirika yopangira mankhwala ofunikira okhala ndi nayitrogeni monga mankhwala ndi mankhwala ophera tizilombo.
Zotsatira za kafukufuku wokhudzana ndi izi zidasindikizidwa mu Angewandte Chemie International Edition pansi pa mutu wakuti “Photocatalytic Formamide Synthesis from Plastic Waste and Ammonia through CN Bond Construction Under Mild Conditions”. Kafukufukuyu adalandira ndalama kuchokera ku mapulojekiti othandizidwa ndi National Natural Science Foundation of China, Joint Laboratory Fund for Novel Materials pakati pa Chinese Academy of Sciences ndi The University of Hong Kong, pakati pa magwero ena.
Nthawi yotumizira: Sep-26-2025