I-Polyethylene terephthalate (PET), njenge-polyester ebalulekile ye-thermoplastic, inomkhiqizo womhlaba wonke waminyaka yonke odlula amathani ayizigidi ezingu-70 futhi isetshenziswa kabanzi ekupakisheni ukudla kwansuku zonke, ezindwangu, nakwezinye izinkambu. Kodwa-ke, ngemuva kwaleli nani elikhulu lokukhiqiza, cishe u-80% wemfucuza ye-PET ilahlwa ngokungakhethi noma igcwaliswe ngodaka, okubangela ukungcola okukhulu kwemvelo futhi kuholele ekuchithweni kwemithombo emikhulu yekhabhoni. Indlela yokufeza ukuphinda kusetshenziswe imfucuza ye-PET ibe yinselele ebalulekile edinga impumelelo yentuthuko eqhubekayo yomhlaba wonke.
Phakathi kobuchwepheshe bokuvuselela obukhona, ubuchwepheshe be-photoreforming buthole ukunakwa okukhulu ngenxa yezici zalo eziluhlaza nezithambile. Le ndlela isebenzisa amandla elanga ahlanzekile, angangcolisi njengamandla okuqhuba, ikhiqiza izinhlobo ze-redox ezisebenzayo endaweni ngaphansi kokushisa okuzungezile kanye nengcindezi ukuze kube lula ukuguqulwa kanye nokuthuthukiswa kwenani elengeziwe lamapulasitiki angcolile. Kodwa-ke, imikhiqizo yezinqubo zamanje ze-photoreforming ikhawulelwe kakhulu kumakhemikhali alula aqukethe umoya-mpilo njenge-formic acid kanye ne-glycolic acid.
Muva nje, ithimba locwaningo elivela e-Center for Photochemical Conversion and Synthesis esikhungweni eShayina liphakamise ukusebenzisa imfucuza ye-PET kanye ne-ammonia njengemithombo yekhabhoni ne-nitrogen, ngokulandelana, ukukhiqiza i-formamide nge-photocatalytic CN coupling reaction. Ngenxa yalokhu, abacwaningi baklame i-photocatalyst ye-Pt1Au/TiO2. Kulesi sici, izindawo ze-Pt ezine-athomu eyodwa zibamba ngokukhetha ama-electron akhiqizwa nge-photocatalytic, kuyilapho ama-nanoparticles e-Au ebamba imigodi ekhiqizwa nge-photocatalytic, okuthuthukisa kakhulu ukuhlukaniswa nokusebenza kahle kokudluliselwa kwamabhangqa e-electron-hole akhiqizwa nge-photocatalytic, ngaleyo ndlela kukhulisa umsebenzi we-photocatalytic. Izinga lokukhiqizwa kwe-formamide lifinyelele cishe ku-7.1 mmol gcat⁻¹ h⁻¹. Ukuhlolwa okufana ne-in-situ infrared spectroscopy kanye ne-electron paramagnetic resonance kwembule indlela yokusabela eqondiswa yi-radical: imigodi ekhiqizwa nge-photocatalytic ngesikhathi esisodwa i-oxidize i-ethylene glycol kanye ne-ammonia, ikhiqiza ama-intermediate e-aldehyde nama-amino radicals (·NH₂), adlula ku-CN coupling ukuze ekugcineni akhe i-formamide. Lo msebenzi awugcini nje ngokusungula indlela entsha yokuguqulwa kwepulasitiki elahliwe ngenani eliphezulu, uthuthukisa ububanzi bemikhiqizo yokuthuthukisa ama-PET, kodwa futhi unikeza isu lokwenziwa eliluhlaza, elingabizi kakhulu, nelithembisayo lokukhiqizwa kwamakhemikhali abalulekile aqukethe i-nitrogen njengemithi kanye nezibulala-zinambuzane.
Okutholakele kocwaningo okuhlobene kushicilelwe ku-Angewandte Chemie International Edition ngaphansi kwesihloko esithi “Photocatalytic Formamide Synthesis from Plastic Waste and Ammonia via CN Bond Construction Under Mild Conditions”. Ucwaningo luthole uxhaso oluvela kumaphrojekthi asekelwa yiNational Natural Science Foundation of China, i-Joint Laboratory Fund for Novel Materials phakathi kwe-Chinese Academy of Sciences kanye ne-University of Hong Kong, phakathi kweminye imithombo.
Isikhathi sokuthunyelwe: Septhemba-26-2025