Polyethylene terephthalate (PET), o se polyester thermoplastic taua, o loʻo i ai se gaosiga faʻaletausaga faaletausaga e sili atu i le 70 miliona tone ma e faʻaaogaina lautele i meaʻai i aso uma, ie, ma isi fanua. Ae ui i lea, i tua atu o le tele o le gaosiga o le gaosiga, e tusa ma le 80% o otaota PET o loʻo lafoaʻia pe faʻapalapala, ma mafua ai le leaga o le siosiomaga ma mafua ai ona faʻaumatia le tele o punaoa carbon. Le fa'afefea ona ausia le toe fa'aaogaina o otaota PET ua avea ma lu'itau taua e mana'omia ai ni fa'alavelave mo le atina'e gafataulimaina o le lalolagi.
Faatasi ai ma tekinolosi toe faʻaaogaina o loʻo i ai nei, o le photoreforming technology ua faʻatauaina tele ona o ona uiga lanumeamata ma le agamalu. O lenei metotia e fa'aogaina ai le malosi mama e le fa'aleaga ai le la e avea ma malosiaga fa'aola, fa'atupuina ituaiga redox ola i totonu i lalo o le vevela ma le mamafa e faafaigofie ai le liua ma le fa'aleleia atili o le tau o lapisi otaota. Ae ui i lea, o oloa o loʻo i ai nei faiga faʻataʻitaʻiga e tele lava ina faʻatapulaʻaina i mea faigofie e maua ai le okesene e pei ole formic acid ma glycolic acid.
Talu ai nei, o se vaega suʻesuʻe mai le Center for Photochemical Conversion and Synthesis i se inisitituti i Saina na fautuaina le faʻaaogaina o otaota PET ma le amonia e avea ma puna o le carbon ma nitrogen, i le faasologa, e gaosia ai le formamide e ala i le photocatalytic CN coupling reaction. I lenei tulaga, na mamanuina e le au suʻesuʻe se Pt1Au / TiO2 photocatalyst. I lenei catalyst, tasi-atom Pt nofoaga filifili puʻeina photogenerated electrons, ao Au nanoparticles puʻeina photogenerated pu, matua faʻaleleia le vavaeeseina ma le fesiitaiga lelei o photogenerated electron-pu paipa, ma faʻamalosia photocatalytic gaoioiga. Ole fua ole gaosiga ole formamide na o'o ile 7.1 mmol gcat⁻¹ h⁻¹. O fa'ata'ita'iga e pei o le in-situ infrared spectroscopy ma le electron paramagnetic resonance na fa'aalia ai se auala fa'afefeteina fa'alaua'itele: pu fa'atupu fa'ata'ita'i fa'atasi i le taimi e tasi e fa'ama'iina ai le ethylene glycol ma le ammonia, fa'atupuina ai le aldehyde intermediates ma amino radicals (·NH₂), lea e fa'aogaina le CN coupling e iu ai ina fausia le formamide. O lenei galuega e le gata o paionia se auala fou mo le suiga maualuga-taua o palasitisi otaota, faʻatamaoaigaina le fusi o alaleo o oloa faʻaleleia PET, ae maua ai foi se lanu meamata, sili atu le tamaoaiga, ma folafolaga synthetic fuafuaga mo le gaosiga o mea taua o le nitrogen-o loʻo i ai faʻamaʻi e pei o vailaʻau ma vailaau faʻasaina.
O su'esu'ega fa'atatau na fa'asalalauina i le Angewandte Chemie International Edition i lalo o le ulutala "Photocatalytic Formamide Synthesis from Plastic Waste and Ammonia via CN Bond Construction Under Mild Conditions". O le suʻesuʻega na maua mai tupe mai poloketi na lagolagoina e le National Natural Science Foundation o Saina, le Joint Laboratory Fund for Novel Materials i le va o le Chinese Academy of Sciences ma le Iunivesite o Hong Kong, faatasi ai ma isi punaoa.
Taimi meli: Sep-26-2025