ʻO ka Polyethylene terephthalate (PET), ma ke ʻano he polyester thermoplastic koʻikoʻi, he hana makahiki honua ma mua o 70 miliona tons a hoʻohana nui ʻia i ka ʻeke meaʻai i kēlā me kēia lā, textiles, a me nā māla ʻē aʻe. Eia nō naʻe, ma hope o kēia leo hana nui, ma kahi o 80% o ka ʻōpala PET i hoʻolei ʻia a hoʻolei ʻia paha, e hoʻohaumia ana i ke kaiapuni a alakaʻi i ka pau ʻana o nā kumu waiwai kalapona. Pehea e hoʻokō ai i ka hana hou ʻana o ka ʻōpala PET ua lilo i mea paʻakikī koʻikoʻi e koi ana i nā holomua no ka hoʻomohala hoʻomau honua.
Ma waena o nā ʻenehana hana hou, ua ʻike nui ʻia ka ʻenehana photoreforming ma muli o kona ʻano ʻōmaʻomaʻo a ʻoluʻolu. Hoʻohana kēia ʻenehana i ka ikehu lā maʻemaʻe, ʻaʻole hoʻohaumia i ka lā ma ke ʻano he mea hoʻokele, e hoʻohua ana i nā ʻano redox ikaika ma ke kahua ma lalo o ka mahana a me ke kaomi ʻana e hoʻomaʻamaʻa i ka hoʻololi ʻana a me ka hoʻonui ʻana i ka waiwai o nā palaka ʻōpala. Eia nō naʻe, ʻo nā huahana o nā kaʻina hana photoreforming i kēia manawa ua kaupalena ʻia i nā pūhui oxygen-containing maʻalahi e like me formic acid a me glycolic acid.
I kēia mau lā, ua manaʻo kekahi hui noiʻi mai ka Center for Photochemical Conversion and Synthesis ma kahi keʻena ma Kina e hoʻohana i ka ʻōpala PET a me ka amonia ma ke ʻano he kumu kalapona a me ka nitrogen, kēlā me kēia, e hana i ka formamide ma o ka photocatalytic CN coupling reaction. No kēia hopena, ua hoʻolālā nā mea noiʻi i kahi photocatalyst Pt1Au / TiO2. Ma keia catalyst, hookahi-atom Pt paena selectively hopu photogenerated electrons, oiai Au nanoparticles hopu photogenerated puka, nui hoʻonui i ka kaawale ana a me ka hoʻoili pono o photogenerated electron-hole lua, pela boosting photocatalytic hana. Ua hiki ka nui o ka hana formamide ma kahi o 7.1 mmol gcat⁻¹ h⁻¹. ʻO nā hoʻokolohua e like me ka in-situ infrared spectroscopy a me ka electron paramagnetic resonance i hōʻike i kahi ala hoʻololi radical-mediated: ʻo nā puka kiʻi kiʻi i ka manawa like e hoʻoneʻe i ka ethylene glycol a me ka amonia, e hoʻohua ana i nā aldehyde intermediates a me nā radical amino (·NH₂), e hoʻopili ana i ka CN coupling e hana hope loa i formamide. ʻAʻole wale kēia hana i paionia i ke ala hou no ka hoʻololi ʻana i ka waiwai kiʻekiʻe o nā plastics ʻōpala, hoʻonui i ka spectrum o nā huahana hoʻomaikaʻi PET, akā hāʻawi pū kekahi i kahi hoʻolālā synthetic ʻoi aku ka maikaʻi, ʻoi aku ka maikaʻi, a me ka hoʻohiki ʻana no ka hana ʻana i nā pūhui koʻikoʻi i loko o ka nitrogen e like me nā lāʻau lapaʻau a me nā pesticides.
Ua paʻi ʻia nā ʻike noiʻi pili ma Angewandte Chemie International Edition ma lalo o ke poʻo inoa "Photocatalytic Formamide Synthesis from Plastic Waste and Ammonia via CN Bond Construction Under Mild Conditions". Ua loaʻa i ka noiʻi ke kālā mai nā papahana i kākoʻo ʻia e ka National Natural Science Foundation of China, ka Joint Laboratory Fund for Novel Materials ma waena o ka Chinese Academy of Science a me The University of Hong Kong, ma waena o nā kumu ʻē aʻe.
Ka manawa hoʻouna: Sep-26-2025