ʻO Newswise - Ke hoʻomau nei ka ulu ʻana o ke koi no nā wahie kalapona e hoʻoulu ai i ka hoʻokele waiwai e hoʻonui i ka nui o ke kalapona dioxide (CO2) i ka lewa. ʻOiai ke hoʻoikaika nei e hōʻemi i nā hoʻokuʻu ʻana o CO2, ʻaʻole kēia e hōʻemi i nā hopena ʻino o ke kinoea i ka lewa. No laila, ua loaʻa i nā mea noiʻi nā ala hana noʻeau e hoʻohana ai i ka CO2 lewa ma ka hoʻololi ʻana i nā mea waiwai e like me ka waikawa formic (HCOOH) a me ka methanol. ʻO ka hoʻemi ʻana o ka CO2 me ka hoʻohana ʻana i nā photocatalysts e hoʻohana ana i ka mālamalama ʻike ʻia ma ke ʻano he catalyst he ʻano kaulana ia no ia mau hoʻololi.
Ma ka holomua hou loa, i hōʻike ʻia ma ka paʻi honua o Angewandte Chemie i ka lā 8 o Mei, 2023, ua holomua nui ʻo Polopeka Kazuhiko Maeda a me kāna hui noiʻi ma ka Tokyo Institute of Technology. Ua hoʻomohala pono lākou i kahi ʻōnaehana metala-organic tin (Sn) (MOF) e paipai ana i ka photoreduction koho o CO2. ʻO ka MOF i hoʻolauna hou ʻia ua kapa ʻia ʻo KGF-10 a ʻo kāna ʻano kemika ʻo [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid, MeOH: methanol). Ma ka hoʻohana ʻana i ka mālamalama ʻike ʻia, hoʻololi maikaʻi ʻo KGF-10 i ka CO2 i ka waikawa formic (HCOOH). Ua wehewehe ʻo Polopeka Maeda, "A hiki i kēia lā, ua hoʻomohala ʻia nā photocatalysts maikaʻi loa no ka hōʻemi ʻana i ka CO2 e pili ana i nā metala kakaikahi a hanohano. Eia nō naʻe, ʻo ka hoʻohui ʻana i nā hana omo mālamalama a me nā catalytic i loko o kahi ʻāpana molekala hoʻokahi i haku ʻia me ka nui o nā metala he mea paʻakikī ia." No laila, ua hōʻoia ʻo Sn he moho kūpono e lanakila ai i kēia mau pilikia ʻelua.
ʻO nā MOF, e hoʻohui ana i nā pono o nā metala a me nā mea olaola, ke ʻimi ʻia nei ma ke ʻano he koho ʻōmaʻomaʻo i nā photocatalysts kuʻuna e pili ana i nā metala honua laha ʻole. ʻO Sn, i ʻike ʻia no kāna kuleana pālua ma ke ʻano he mea hoʻoulu a me ka mea hoʻomoʻa mālamalama i nā kaʻina hana photocatalyst, hiki ke lilo i koho kūpono no nā photocatalysts e pili ana i ka MOF. ʻOiai ua aʻo nui ʻia nā MOF i haku ʻia me ka zirconium, ka hao, a me ke kēpau, ua kaupalena ʻia ka ʻike ʻana i nā MOF e pili ana i ka Sn. Pono nā haʻawina hou aʻe a me nā haʻawina e ʻimi piha i nā mea hiki a me nā hoʻohana kūpono o nā MOF e pili ana i ka Sn ma ke kahua o ka photocatalysis.
No ka hana ʻana i ka MOF KGF-10 i hoʻokumu ʻia i ka tin, ua hoʻohana nā mea noiʻi iā H3ttc (trithiocyanuric acid), MeOH (methanol), a me ka tin chloride ma ke ʻano he mau mea hoʻomaka. Ua koho lākou i ka 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole ma ke ʻano he mea hāʻawi uila a me ke kumu hydrogen. Ma hope o ka hana ʻana, ua hoʻokomo ʻia ka KGF-10 i loaʻa i nā ʻano hana loiloi like ʻole. Ua hōʻike kēia mau hoʻāʻo he hiki ke hoʻopili CO2 maʻamau ka mea me kahi band gap o 2.5 eV a me ka absorption maikaʻi i ka pae nalu ʻike ʻia.
Me ka ʻike o nā waiwai kino a me nā kemika o ka mea hou, ua hoʻohana nā kānaka ʻepekema iā ia e hoʻoulu i ka hōʻemi ʻana o ke kalapona ʻokikene e ka mālamalama ʻike ʻia. ʻO ka mea nui, ua ʻike nā kānaka noiʻi ua hoʻokō ʻo KGF-10 i ka hoʻololi ʻana o CO2 e hoʻokumu (HCOO-) me ka 99% selectivity me ka ʻole o kekahi photosensitizer kōkua a i ʻole catalyst. Eia kekahi, ua hōʻike ʻo KGF-10 i kahi hua quantum kiʻekiʻe loa - kahi ana o ka pono o ka hoʻohana ʻana i nā photons - e hōʻea ana i ka waiwai o 9.8% ma 400 nm. ʻO ka mea nui, ua hōʻike ka loiloi kūkulu i hana ʻia i ka wā o ka hopena photocatalytic ua hana ʻo KGF-10 i kahi hoʻololi kūkulu e kōkua i ke kaʻina hana hōʻemi.
Hōʻike kēia noiʻi groundbreaking i kahi photocatalyst hana kiʻekiʻe ʻo KGF-10 me ka ʻole o ka pono no nā metala hanohano ma ke ʻano he mea hoʻoulu hoʻokahi ala no ka hōʻemi ʻana o CO2 e hoʻokumu ʻia e ka mālamalama ʻike ʻia. ʻO nā waiwai kupaianaha o KGF-10 i hōʻike ʻia ma kēia haʻawina hiki ke hoʻololi i kona hoʻohana ʻana ma ke ʻano he photocatalyst i nā ʻano noi like ʻole, me ka hōʻemi ʻana o ka CO2 solar. Ua hoʻopau ʻo Polofesa Maeda: "Hōʻike kā mākou mau hopena e hiki i nā MOF ke lawelawe ma ke ʻano he kahua no ka hoʻomohala ʻana i nā hiki photocatalytic kiʻekiʻe me ka hoʻohana ʻana i nā metala ʻaʻohe ʻawaʻawa, kūpono ke kumukūʻai a nui i loaʻa ma ka Honua, ʻo ia hoʻi nā hui metala molekala. ʻAʻole hiki ke loaʻa." Wehe kēia ʻike i nā hiki hou. nā ʻaoʻao hou ma ke kahua o ka photocatalysis a hoʻomākaukau i ke ala no ka hoʻohana mau ʻana a me ka pono o nā kumuwaiwai o ka Honua.
Hāʻawi ʻo Newswise i nā mea kākau moʻolelo i ke komo ʻana i nā nūhou wāwahi a me kahi kahua no nā kulanui, nā ʻoihana a me nā mea kākau moʻolelo e hāʻawi i nā nūhou wāwahi i kā lākou poʻe hoʻolohe.