Polyethylene terephthalate (PET), ua ib qho tseem ceeb thermoplastic polyester, muaj kev tsim khoom thoob ntiaj teb txhua xyoo tshaj 70 lab tons thiab siv dav hauv kev ntim khoom noj txhua hnub, textiles, thiab lwm yam teb. Txawm li cas los xij, tom qab qhov ntim khoom loj no, kwv yees li 80% ntawm cov khib nyiab PET raug pov tseg lossis pov tseg tsis muaj kev xaiv, ua rau muaj kuab paug rau ib puag ncig thiab ua rau muaj kev pov tseg ntawm cov peev txheej carbon ntau. Yuav ua li cas kom ua tiav kev siv cov khib nyiab PET tau dhau los ua qhov kev sib tw tseem ceeb uas xav tau kev tawg paj rau kev txhim kho thoob ntiaj teb.
Ntawm cov thev naus laus zis rov ua dua tshiab uas twb muaj lawm, thev naus laus zis photoreforming tau txais kev saib xyuas ntau vim nws cov yam ntxwv ntsuab thiab tsis muaj kuab paug. Cov txheej txheem no siv lub zog hnub ci huv, tsis ua rau muaj kuab paug ua lub zog tsav tsheb, tsim cov hom redox nquag hauv qhov chaw nyob rau hauv qhov kub thiab txias thiab siab kom pab txhawb kev hloov pauv thiab kev txhim kho tus nqi ntxiv ntawm cov yas pov tseg. Txawm li cas los xij, cov khoom lag luam ntawm cov txheej txheem photoreforming tam sim no feem ntau txwv rau cov tshuaj yooj yim uas muaj oxygen xws li formic acid thiab glycolic acid.
Tsis ntev los no, ib pab pawg tshawb fawb los ntawm Lub Chaw rau Kev Hloov Pauv thiab Kev Tsim Khoom ntawm ib lub koom haum hauv Suav teb tau tawm tswv yim siv cov khib nyiab PET thiab ammonia ua cov pa roj carbon thiab nitrogen, raws li, los tsim cov formamide los ntawm kev sib txuas ntawm photocatalytic CN. Txog qhov kawg no, cov kws tshawb fawb tau tsim Pt1Au/TiO2 photocatalyst. Hauv cov catalyst no, cov chaw ib leeg-atom Pt xaiv cov electrons photogenerated, thaum Au nanoparticles ntes cov qhov photogenerated, ua kom zoo dua qhov kev sib cais thiab kev hloov pauv ntawm cov khub electron-hole photogenerated, yog li ua rau muaj kev ua haujlwm photocatalytic. Tus nqi tsim formamide tau txog li 7.1 mmol gcat⁻¹ h⁻¹. Cov kev sim xws li in-situ infrared spectroscopy thiab electron paramagnetic resonance tau qhia txog txoj hauv kev tiv thaiv radical-mediated: cov qhov photogenerated tib lub sijhawm oxidize ethylene glycol thiab ammonia, tsim cov aldehyde intermediates thiab amino radicals (·NH₂), uas dhau los ntawm CN coupling kom thaum kawg tsim formamide. Txoj haujlwm no tsis yog tsuas yog ua thawj coj txoj hauv kev tshiab rau kev hloov pauv cov yas pov tseg uas muaj nqis siab, ua kom muaj txiaj ntsig zoo rau cov khoom siv PET txhim kho, tab sis kuj muab cov tswv yim ntsuab dua, pheej yig dua, thiab muaj kev cia siab rau kev tsim cov tshuaj nitrogen tseem ceeb xws li tshuaj thiab tshuaj tua kab.
Cov kev tshawb pom tshawb pom tau muab luam tawm hauv Angewandte Chemie International Edition hauv qab lub npe "Photocatalytic Formamide Synthesis los ntawm Plastic Waste thiab Ammonia ntawm CN Bond Construction Under Mild Conditions". Kev tshawb fawb tau txais nyiaj los ntawm cov haujlwm txhawb nqa los ntawm National Natural Science Foundation of China, Joint Laboratory Fund for Novel Materials ntawm Chinese Academy of Sciences thiab The University of Hong Kong, ntawm lwm qhov chaw.
Lub sijhawm tshaj tawm: Cuaj hlis-26-2025