Polyethylene terephthalate (PET), sepolyester inokosha yethermoplastic, inogadzirwa pasi rose gore rega rega inopfuura matani mamiriyoni makumi manomwe uye inoshandiswa zvakanyanya mumapakeji ezvekudya zvezuva nezuva, machira, nedzimwe nzvimbo. Zvisinei, mushure mehuwandu hukuru hwekugadzira, inenge 80% yemarara ePET anoraswa zvisina tsarukano kana kuzadzwa nevhu, zvichikonzera kusvibiswa kwakanyanya kwezvakatipoteredza uye zvichikonzera kuraswa kwezviwanikwa zvakawanda zvekabhoni. Maitiro ekudzokorodza marara ePET ave dambudziko guru rinoda budiriro yekusimudzira budiriro yepasi rose.
Pakati pematekinoroji aripo ekudzokorodza, tekinoroji ye photoreforming yawana kutariswa kukuru nekuda kwehunhu hwayo hwegirini uye hunyoro. Iyi nzira inoshandisa simba rezuva rakachena, risingasvibisi sesimba rinofambisa, richigadzira mhando dze redox dzinoshanda dziri panzvimbo pasi pekupisa kwekunze uye kumanikidzwa kuti zvive nyore kushandura uye kuwedzera kukosha kwemapurasitiki emarara. Zvisinei, zvigadzirwa zvemaitiro e photoreforming aripo zvinongogumira kumakemikari ari nyore ane oxygen akadai se formic acid ne glycolic acid.
Munguva pfupi yapfuura, chikwata chekutsvagisa kubva kuCenter for Photochemical Conversion and Synthesis pane imwe nzvimbo muChina chakakurudzira kushandisa marara ePET neammonia senzvimbo dzecarbon nenitrogen, zvichiteerana, kugadzira formamide kuburikidza ne photocatalytic CN coupling reaction. Kuti izvi zviitike, vaongorori vakagadzira Pt1Au/TiO2 photocatalyst. Mune iyi catalyst, nzvimbo dzePt dzeatom imwe chete dzinotora maerekitironi anogadzirwa ne photocatalytic, nepo Au nanoparticles dzichibata maburi anogadzirwa ne photocatalytic, zvichiwedzera zvakanyanya kupatsanurwa uye kushanda zvakanaka kwezvikamu zvemaerekitironi-maburi zvinogadzirwa ne photocatalytic, nokudaro zvichiwedzera basa re photocatalytic. Mwero wekugadzirwa kweformamide wakasvika pa7.1 mmol gcat⁻¹ h⁻¹. Kuedza kwakadai se in-situ infrared spectroscopy uye electron paramagnetic resonance kwakaratidza nzira ye radical-mediated reaction: maburi anogadzirwa ne photocatalytic panguva imwe chete oxidize ethylene glycol neammonia, zvichigadzira aldehyde intermediates uye amino radicals (·NH₂), ayo anopfuudzwa neCN coupling kuti agadzire formamide. Basa iri haringori nzira itsva yekushandura mapurasitiki emarara zvine mutengo mukuru, zvichiwedzera huwandu hwezvigadzirwa zvekuvandudza maPET, asiwo zvinopa nzira yekugadzira zvinhu zvine girini, isingadhuri, uye inovimbisa yekugadzira zvinhu zvine nitrogen zvakaita semishonga nemishonga yekuuraya zvipembenene.
Zvakawanikwa pakutsvagisa zvine chekuita nazvo zvakaburitswa muAngewandte Chemie International Edition pasi pemusoro unoti “Photocatalytic Formamide Synthesis from Plastic Waste and Ammonia via CN Bond Construction Under Mild Conditions”. Tsvagiridzo iyi yakawana mari kubva kumapurojekiti akatsigirwa neNational Natural Science Foundation of China, iyo Joint Laboratory Fund for Novel Materials pakati peChinese Academy of Sciences neThe University of Hong Kong, pakati pezvimwe zvinhu.
Nguva yekutumira: Gunyana-26-2025