Formamide: Manaʻo kahi ʻInikua Noiʻi i ka Photoreforming o ka ʻōpala PET Plastic e hana i ka Formamide

ʻO ka Polyethylene terephthalate (PET), ma ke ʻano he polyester thermoplastic koʻikoʻi, he 70 miliona tons ka nui o ka hana honua i kēlā me kēia makahiki a hoʻohana nui ʻia i nā ʻōpala meaʻai o kēlā me kēia lā, nā lole, a me nā ʻoihana ʻē aʻe. Eia nō naʻe, ma hope o kēia nui o ka hana ʻana, ua hoʻolei wale ʻia a hoʻolei ʻia paha ma kahi o 80% o ka ʻōpala PET, e hoʻoulu ai i ka haumia nui o ke kaiapuni a alakaʻi i ka hoʻonele ʻana i nā kumuwaiwai kalapona nui. Pehea e hoʻokō ai i ka hana hou ʻana o ka ʻōpala PET ua lilo ia i mea paʻakikī e koi ana i nā holomua no ka hoʻomohala hoʻomau honua.

Ma waena o nā ʻenehana hana hou e kū nei, ua loaʻa i ka ʻenehana photoreforming ka nānā nui ma muli o kona ʻano ʻōmaʻomaʻo a me ka palupalu. Hoʻohana kēia ʻenehana i ka ikehu lā maʻemaʻe a ʻaʻole haumia e like me ka ikaika hoʻokele, e hana ana i nā ʻano redox hana ma kahi ma lalo o ka mahana a me ke kaomi ambient e hoʻomaʻalahi i ka hoʻololi ʻana a me ka hoʻonui ʻana i ka waiwai o nā plastics ʻōpala. Eia nō naʻe, ʻo nā huahana o nā kaʻina hana photoreforming o kēia manawa ua kaupalena ʻia i nā hui oxygen maʻalahi e like me ka formic acid a me ka glycolic acid.

I kēia mau lā aku nei, ua hāpai kahi hui noiʻi mai ke Kikowaena no ka Hoʻololi ʻana a me ka Synthesis Photochemical ma kahi ʻoihana ma Kina i ka hoʻohana ʻana i ka ʻōpala PET a me ka ammonia ma ke ʻano he kumu kalapona a me ka naikokene, e hana i ka formamide ma o kahi hopena hoʻopili CN photocatalytic. No kēia hopena, ua hoʻolālā nā mea noiʻi i kahi photocatalyst Pt1Au/TiO2. Ma kēia mea hoʻoulu, hopu koho nā wahi Pt atom hoʻokahi i nā electrons photogenerated, ʻoiai ʻo nā nanoparticles Au e hopu i nā lua photogenerated, e hoʻonui nui ana i ka hoʻokaʻawale ʻana a me ka hoʻoili ʻana i ka pono o nā hui electron-hole photogenerated, a laila e hoʻonui ana i ka hana photocatalytic. Ua hōʻea ka helu hana formamide ma kahi o 7.1 mmol gcat⁻¹ h⁻¹. Ua hōʻike nā hoʻokolohua e like me ka spectroscopy infrared in-situ a me ka electron paramagnetic resonance i kahi ala hopena radical-mediated: hoʻopau nā lua photogenerated i ka ethylene glycol a me ka ammonia i ka manawa like, e hana ana i nā aldehyde intermediates a me nā amino radicals (·NH₂), kahi e hana ai i ka hoʻopili CN e hana hope loa i ka formamide. ʻAʻole wale kēia hana e paionia i kahi ala hou no ka hoʻololi waiwai nui o nā palakiko ʻōpala, e hoʻonui ana i ka laulā o nā huahana hoʻonui PET, akā hāʻawi pū kekahi i kahi hoʻolālā synthetic ʻōmaʻomaʻo, ʻoi aku ka hoʻokele waiwai, a hoʻohiki hoʻi no ka hana ʻana i nā pūhui nitrogen koʻikoʻi 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 ʻo "Photocatalytic Formamide Synthesis from Plastic Waste and Ammonia via CN Bond Construction Under Mild Conditions". Ua loaʻa ke kālā i ka noiʻi 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 Sciences a me ke Kulanui o Hong Kong, a me nā kumu ʻē aʻe.