Hoʻohana mākou i nā kuki e hoʻomaikaʻi i kou ʻike. Ma ka hoʻomau ʻana e nānā i kēia pūnaewele, ʻae ʻoe i kā mākou hoʻohana ʻana i nā kuki. ʻIke hou aku.
ʻO ka hoʻomau ʻana o ke koi ʻana o ka hoʻokele waiwai no nā wahie kalapona kiʻekiʻe ua alakaʻi i ka piʻi ʻana o ke kalapona ʻokikene (CO2) i ka lewa. ʻOiai inā e hana ʻia nā hoʻoikaika e hōʻemi i nā hoʻokuʻu ʻana o ke kalapona ʻokikene, ʻaʻole lawa ia e hoʻohuli i nā hopena ʻino o ke kinoea i loko o ka lewa.
No laila, ua hoʻomohala nā kānaka ʻepekema i nā ala hana noʻeau e hoʻohana ai i ke kalapona ʻokikene i loko o ka lewa ma o ka hoʻololi ʻana iā ia i mau molekala pono e like me ka waikawa formic (HCOOH) a me ka methanol. ʻO ka photoreduction photocatalytic o ke kalapona ʻokikene me ka hoʻohana ʻana i ka mālamalama ʻike ʻia he ʻano maʻamau no ia mau hoʻololi ʻana.
Ua holomua nui kahi hui o nā kānaka ʻepekema mai ka Tokyo Institute of Technology, i alakaʻi ʻia e Polofesa Kazuhiko Maeda, a ua hoʻopaʻa ʻia ma ka puke pai honua "Angewandte Chemie" i ka lā 8 o Mei, 2023.
Ua hana lākou i kahi ʻōnaehana metala-organic (MOF) i hoʻokumu ʻia i ka tin e hiki ai ke hoʻemi koho ʻia o ke kalapona ʻokikene. Hoʻokumu nā mea noiʻi i kahi MOF hou i hoʻokumu ʻia i ka tin (Sn) me ke ʻano kemika [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid a me MeOH: methanol).
Hoʻohana ka hapa nui o nā photocatalysts CO2 i hoʻokumu ʻia i ka mālamalama ʻike maka ʻia i nā metala makamae kakaikahi ma ke ʻano he mau ʻāpana nui. Eia kekahi, ʻo ka hoʻohui ʻana o ka omo ʻana o ka mālamalama a me nā hana catalytic i loko o kahi ʻāpana molekala hoʻokahi i haku ʻia me ka nui o nā metala he pilikia lōʻihi ia. No laila, ʻo Sn kahi moho kūpono no ka mea hiki iā ia ke hoʻoponopono i nā pilikia ʻelua.
ʻO nā MOF nā mea maikaʻi loa no nā metala a me nā mea organik, a ke aʻo ʻia nei nā MOF ma ke ʻano he koho ʻōmaʻomaʻo i nā photocatalysts honua laha ʻole kuʻuna.
He koho kūpono ʻo Sn no nā photocatalysts e pili ana i ka MOF no ka mea hiki iā ia ke hana ma ke ʻano he mea hoʻoulu a me ka scavenger i ka wā o ke kaʻina hana photocatalytic. ʻOiai ua aʻo nui ʻia nā MOFs e pili ana i ke kēpau, ka hao, a me ka zirconium, ʻaʻole nui ka ʻike e pili ana i nā MOFs e pili ana i ka tin.
Ua hoʻohana ʻia ʻo H3ttc, MeOH a me ka tin chloride ma ke ʻano he mau mea hoʻomaka e hoʻomākaukau i ka MOF KGF-10 i hoʻokumu ʻia i ka tin, a ua hoʻoholo nā mea noiʻi e hoʻohana i ka 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole. lawelawe ʻo ia ma ke ʻano he mea hāʻawi uila a me ke kumu o ka hydrogen.
A laila ua hoʻokomo ʻia ka KGF-10 hopena i nā kaʻina hana loiloi like ʻole. Ua ʻike lākou he 2.5 eV ka bandgap o ka mea, hoʻopili i nā nalu māmā ʻike ʻia, a he mana adsorption carbon dioxide kūpono.
I ka manawa i hoʻomaopopo ai nā kānaka ʻepekema i nā ʻano kino a me nā kemika o kēia mea hou, ua hoʻohana lākou ia mea e hoʻoulu ai i ka hōʻemi ʻana o ke kalapona ʻokikene i ke alo o ka mālamalama ʻike ʻia. Ua ʻike lākou hiki iā KGF-10 ke hoʻololi pono a koho i ka CO2 i formate (HCOO–) me ka pono a hiki i ka 99% me ka ʻole o ka pono no nā photosensitizers a i ʻole nā ​​​​catalysts hou aʻe.
Loaʻa iā ia kahi moʻolelo kiʻekiʻe loa o ka apparent quantum yield (ka lakio o ka helu o nā electrons i komo i ka hopena i ka helu holoʻokoʻa o nā photons incident) o 9.8% ma kahi nalu o 400 nm. Eia kekahi, ua hōʻike ka loiloi kūkulu i hana ʻia ma o ka hopena ua hana ʻia ʻo KGF-10 i nā hoʻololi kūkulu i hoʻolaha i ka hōʻemi photocatalytic.
Ke hōʻike nei kēia haʻawina no ka manawa mua i kahi photocatalyst tin-based metala ʻole, hoʻokahi ʻāpana, kūpono loa, e hoʻolalelale i ka hoʻololi ʻana o ke kalapona dioxide i formate. ʻO nā waiwai kupaianaha o KGF-10 i ʻike ʻia e ka hui e wehe i nā mea hou no kona hoʻohana ʻana ma ke ʻano he photocatalyst i nā kaʻina hana e like me ka hōʻemi ʻana i nā hoʻokuʻu CO2 me ka hoʻohana ʻana i ka ikehu lā.
Ua hoʻopau ʻo Polofesa Maeda: "Hōʻike kā mākou mau hopena e hiki i nā MOF ke lawelawe ma ke ʻano he kahua no ka hoʻohana ʻana i nā metala ʻawaʻawa ʻole, haʻahaʻa ke kumu kūʻai, a waiwai i ka honua e hana i nā hana photocatalytic kiʻekiʻe i hiki ʻole ke hoʻokō ʻia me ka hoʻohana ʻana i nā paʻakikī metala molekala."
ʻO Kamakura Y et al (2023) ʻO nā ʻōnaehana metala-organic i hoʻokumu ʻia me Tin(II) e hiki ai ke hōʻemi pono a koho i ke kalapona dioxide i ka hoʻokumu ʻia ma lalo o ka mālamalama ʻike ʻia. Kemika Hoʻohana ʻia, Paʻi Honua. doi:10.1002/ani.202305923
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I nā makahiki i hala iho nei, ua hoʻolauna koke ʻia ka Pūnaewele o nā Mea i loko o aneane nā ʻoihana āpau, akā he mea nui loa ia i ka ʻoihana kaʻa uila.