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Kuchubeka nekufuna kwemnotfo emafutsa lanekhabhoni lesetulu kuholele ekukhuleni kwekhabhoni dioxide (i-CO2) emkhatsini. Ngisho nobe kwentiwa imetamo yekunciphisa kukhishwa kwe- carbon dioxide, ayanele kutsi ibuyisele emuva imiphumela leyingoti yalegesi lesevele ikhona emkhatsini.
Ngako bososayensi batfutfukise tindlela tekudala tekusebentisa i-carbon dioxide levele isemoyeni ngekutsi bayiguculele etintfweni letilusito letifana ne-formic acid (HCOOH) ne-methanol. Kunciphisa kwe-photocatalytic kwe-carbon dioxide kusetjentiswa kukhanya lokubonakalako kuyindlela levamile yetingucuko letinjalo.
Licembu labososayensi labavela eSikhungweni Setebucwepheshe saseTokyo, leliholwa nguSolwazi Kazuhiko Maeda, lente inchubekelembili lenkhulu futsi layibhala encwadzini yemave emhlaba letsi “Angewandte Chemie” leyashicilelwa mhla tinge-8 Inhlaba, 2023.
Bakha luhlaka lwensimbi-lephilako (i-MOF) lolusekelwe ematini loluvumela kuncishiswa kwekukhanya lokukhetsiwe kwe-carbon dioxide. Labacwaningi benta i-MOF lensha lesekelwe etin (Sn) lenefomula yemakhemikhali [SnII2(H3ttc)2.MeOH]n (H3ttc: i-esidi ye-trithiocyanuric kanye ne-MeOH: i-methanol).
Ema-photocatalysts lamanyenti labonakalako lasebenta kahle kakhulu lasekelwe ekukhanyeni kwe-CO2 asebentisa tinsimbi letiligugu letingakavami njengetincenye tawo letiyinhloko. Ngetulu kwaloko, kuhlanganiswa kwekutsatsa kukhanya kanye nemisebenti ye-catalytic ibe yunithi yinye ye-molecule leyakhiwe ngetinsimbi letinyenti kuhlala kuyinselele leseyikhona sikhatsi lesidze. Ngaleyo ndlela, Sn ungummeleli lokahle ngoba angacatulula totimbili tinkinga.
Ema MOFs tintfo letinhle kakhulu tetinsimbi kanye netintfo letiphilako, futsi ema MOFs ayafundvwa njengenye indlela leluhlata kune photocatalysts yemhlaba lengakavami yendabuko.
Sn ngukukhetsa lokungenteka kwema photocatalysts lasekelwe ku MOF ngoba ingasebenta njengesikhutsati kanye ne scavenger ngesikhatsi senkambo ye photocatalytic. Noma nje ema MOFs lasekelwe ku lead, iron, kanye ne zirconium afundvwe kakhulu, kuncane lokwatiwako ngema MOFs lasekelwe ku tin.
I-H3ttc, i-MeOH kanye ne-tin chloride yasetjentiswa njengetinongo tekucala kulungisa i-MOF KGF-10 lesekelwe etin, futsi bacwaningi bancuma kusebentisa i-1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole. isebenta njengemnikeli we-electron kanye nemtfombo we-hydrogen.
I-KGF-10 lephumelelako ibese ibhekene netinchubo letehlukene tekuhlatiya. Batfola kutsi lentfo ine-bandgap lengu 2.5 eV, imunya emagagasi ekukhanya labonakalako, futsi inemandla ekutsatsa i-carbon dioxide lesemkhatsini.
Lapho bososayensi sebacondze tintfo letibonakalako kanye nemakhemikhali talentfo lensha, bayisebentisa kute bakhutsate kunciphisa i- carbon dioxide nangabe kunekukhanya lokubonakalako. Batfola kutsi iKGF-10 ingagucula kahle futsi ngekukhetsa iCO2 ibe yi formate (HCOO–) ngekusebenta kahle lokufika ku 99% ngaphandle kwesidzingo setintfo letengetiwe tekukhanya noma tintfo letikhutsatako.
Iphindze ibe nerekhodi lephakeme lebonakalako yekukhicita kwe-quantum (silinganiso selinani lema-electrons latsintseka ekuphendvuleni kwelinani leliphelele le-photons yesehlakalo) le-9.8% ngebudze begagasi le-400 nm. Ngetulu kwaloko, kuhlatiya kwesakhiwo lokwentiwe kulo lonkhe lendlela yekuphendvula kwakhombisa kutsi i-KGF-10 yenta kuguculwa kwesakhiwo lokukhutsata kuncishiswa kwe-photocatalytic.
Lolucwaningo lwetfula kwekucala ngca i-photocatalyst lesebenta kahle kakhulu, lenencenye yinye, lengenasimbi leligugu lesekelwe etintini kute kusheshiswe kuguculwa kwe-carbon dioxide ibe yi-formate. Timphahla letimangalisako te KGF-10 letitfolwe ngulelicembu tivula ematfuba lamasha ekusetjentiswa kwayo njenge photocatalyst etinchubeni letifana nekunciphisa kukhishwa kwe CO2 kusetjentiswa emandla elanga.
Solwati Maeda waphetsa ngekutsi: “Imiphumela yetfu ikhombisa kutsi ema-MOF angasebenta njengenkhundla yekusebentisa tinsimbi letite buthi, letibita kancane, naleticebile emhlabeni kute kwentiwe imisebenti lesetulu ye- photocatalytic levame kungafinyeleleki ngekusebentisa tinsimbi letihlangene letinemamolekhyuli.”
Kamakura Y et al (2023) Tinhlaka letisekelwe ku Tin(II) tensimbi-letiphilako tinika emandla ekunciphisa lokusebentako nalokukhetsiwe kwekhabhoni dioxide kuya ekwakhiweni ngaphansi kwekukhanya lokubonakalako. Ikhemikhali Lesetjentisiwe, Luhlelo Lwemhlaba Wonkhe. doi: 10.1002/minyaka.202305923
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