I-Polyethylene terephthalate (PET), njenge-polyester ebalulekile ye-thermoplastic, inomkhiqizo waminyaka yonke womhlaba wonke owedlula amathani ayizigidi ezingu-70 futhi isetshenziswa kabanzi ekufakweni kokudla kwansuku zonke, izindwangu, neminye imikhakha. Kodwa-ke, ngemuva kwalo mthamo omkhulu wokukhiqiza, cishe u-80% wemfucuza ye-PET ilahlwa ngokungakhethi noma igcwaliswe emhlabathini, okubangela ukungcoliswa kwemvelo okukhulu futhi okuholela ekumoshweni kwemithombo yekhabhoni eningi. Ukufinyelela kanjani ukugaywa kabusha kwemfucuza i-PET isiphenduke inselele ebucayi edinga impumelelo yentuthuko esimeme yomhlaba wonke.
Phakathi kobuchwepheshe bokugaywa kabusha obukhona, ubuchwepheshe be-photoreforming buzuze ukunakwa okubalulekile ngenxa yezimpawu zabo eziluhlaza nezithambile. Le nqubo isebenzisa amandla elanga ahlanzekile, angangcolisi njengamandla okushayela, ikhiqiza izinhlobo ze-redox ezisebenzayo endaweni ngaphansi kwezinga lokushisa elizungezile kanye nengcindezi ukuze kube lula ukuguqulwa kanye nokuthuthukiswa kwenani okungeziwe kwamapulasitiki angcolile. Kodwa-ke, imikhiqizo yezinqubo zamanje ze-photoreforming ikhawulelwe kakhulu ezintweni ezilula eziqukethe umoya-mpilo njenge-formic acid ne-glycolic acid.
Muva nje, ithimba labacwaningi elivela ku-Center for Photochemical Conversion and Synthesis esikhungweni sase-China lihlongoze ukusebenzisa imfucuza i-PET ne-ammonia njengemithombo ye-carbon ne-nitrogen, ngokulandelana, ukukhiqiza i-formamide nge-photocatalytic CN coupling reaction. Kulokhu, abacwaningi baklame i-photocatalyst ye-Pt1Au/TiO2. Kule catalyst, amasayithi e-Pt e-athomu eyodwa athwebula ama-electron akhiqizwe izithombe, kuyilapho i-Au nanoparticles ithwebula izimbobo ezenziwe izithombe, ithuthukisa ngokuphawulekayo ukuhlukana nokudlulisa ukusebenza kahle kwamapheya e-electron-hole enziwe izithombe, ngaleyo ndlela akhulise umsebenzi we-photocatalytic. Izinga lokukhiqiza i-formamide lifinyelele cishe ku-7.1 mmol gcat⁻¹ h⁻¹. Izivivinyo ezifana ne-in-situ infrared spectroscopy kanye ne-electron paramagnetic resonance yembula indlela yokusabela ephakathi nendawo: izimbobo ezenziwe izithombe kanyekanye zi-oxidize i-ethylene glycol ne-ammonia, ekhiqiza i-aldehyde intermediate kanye nama-amino radicals (·NH₂), athola ukuhlangana kwe-CN ukuze ekugcineni akhe ama-mamide. Lo msebenzi awugcini nje ngokuvula indlela entsha yokuguqulwa kwenani eliphezulu lamapulasitiki alahlwayo, okucebisa i-spectrum yemikhiqizo yokuthuthukisa i-PET, kodwa futhi inikeza isu lokwenziwa eliluhlaza, elongayo, nelithembisayo lokukhiqiza izinhlanganisela ezibalulekile eziqukethe i-nitrogen njengemithi kanye nezibulala-zinambuzane.
Imiphumela yocwaningo ehlobene yashicilelwa 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 kumaphrojekthi asekelwa yiNational Natural Science Foundation yaseChina, iJoint Laboratory Fund yeNovel Materials phakathi kweChinese Academy of Sciences kanye neNyuvesi yaseHong Kong, phakathi kweminye imithombo.
Isikhathi sokuthumela: Sep-26-2025