Ekiwandiiko kino kyekenneenyeddwa okusinziira ku nkola n’enkola za Science X ez’okuwandiika. Abawandiisi bassa essira ku ngeri zino wammanga nga bwe bakakasa nti ebirimu biba bituufu:
Enkyukakyuka y’obudde kizibu kya butonde bw’ensi mu nsi yonna. Ekisinga okuvaako enkyukakyuka y’obudde kwe kwokya ennyo amafuta g’ebintu ebikadde. Zikola omukka oguyitibwa carbon dioxide (CO2), oguyitibwa greenhouse gas oguyamba ensi okubumbulukuka. Okusinziira ku kino, gavumenti okwetoloola ensi yonna zikola enkola ezikendeeza ku bucaafu obw’engeri eyo. Kyokka, okukendeeza ku kaboni afuluma mu bbanga kwokka kiyinza obutamala. Omukka gwa kaboni dayokisayidi ogufulumizibwa nakyo kyetaaga okufugibwa. googletag.cmd.push (omulimu () { googletag.okulaga ('div-gpt-okulanga-1449240174198-2 '); });
Mu nsonga eno, bannassaayansi bateesa okukyusa eddagala lya kaboni dayokisayidi okufuuka ebirungo eby’omuwendo nga methanol ne formic acid (HCOOH). Okukola ekyo eky’oluvannyuma, ensibuko ya ayoni za hayidirayidi (H-), ezenkanankana ne pulotoni emu ne obusannyalazo bubiri, yeetaagibwa. Okugeza, pair ya reduction-oxidation ya nicotinamide adenine dinucleotide (NAD+/NADH) ye jenereta era etterekero lya hydride (H-) mu nsengekera z’ebiramu.
Mu mbeera eno, ttiimu y’abanoonyereza nga bakulembeddwamu Professor Hitoshi Tamiaki okuva mu Ritsumeikan University, Japan, baakola enkola empya ey’eddagala nga bakozesa ebizibu ebiringa ruthenium ebya NAD+/NADH okukendeeza ku CO2 okutuuka ku HCOOH. Ebyavudde mu kunoonyereza kwabwe byafulumiziddwa mu katabo akayitibwa ChemSusChem nga January 13, 2023.
Professor Tamiaki annyonnyola ekimukubiriza okukola okunoonyereza kwe. "Gye buvuddeko kyalagibwa nti ekizibu kya ruthenium ekirina ekifaananyi kya NAD+, [Ru(bpy)2(pbn)](PF6)2, kiyita mu kukendeezebwa kw'obusannyalazo bubiri obw'ekitangaala. Kyavaamu ekizibu eky'ekika kya NADH ekikwatagana [Ru (bpy) )2 (pbnHH)](PF6)2 nga waliwo triethanolamine mu acetonitrile (CH3CN) wansi w'ekitangaala ekirabika," bwe yagambye.
"Okugatta ku ekyo, okufuumuula CO2 mu [Ru(bpy)2(pbnHH)]2+ solution kizza obuggya [Ru(bpy)2(pbn)]2+ era ne kivaamu formate ions (HCOO-). Kyokka, sipiidi yaayo ey'okufulumya eri wansi nnyo. Mumpi. N'olwekyo, okukyusa H- okugifuula CO2 kyetaagisa enkola ya catalytic erongooseddwa."
N’olwekyo, abanoonyereza banoonyereza ku bikozesebwa eby’enjawulo n’embeera z’ensengekera eziyamba okukendeeza ku kaboni dayokisayidi afuluma. Okusinziira ku kugezesa kuno, baawa ekiteeso ky’okukendeeza obusannyalazo bubiri obuleetebwa ekitangaala mu pair ya redox [Ru(bpy)2(pbn)]2+/[Ru(bpy)2(pbnHH)]2+ nga waliwo 1, 3-. Dimetil-2-fenili-2,3-dihayidiro-1H-benzo[d]imidazole (BIH). Okugatta ku ekyo, amazzi (H2O) mu CH3CN mu kifo kya triethanolamine gaayongera okulongoosa amakungula.

Okugatta ku ekyo, abanoonyereza era banoonyereza ku nkola eziyinza okukolebwa nga bakozesa obukodyo nga nuclear magnetic resonance, cyclic voltammetry ne UV-visible spectrophotometry. Okusinziira ku kino, baateebereza nti: Okusooka, ku kusikirizibwa kw’ekitangaala kwa [Ru(bpy)2(pbn)]2+, ekirungo eky’eddembe [RuIII(bpy)2(pbn•-)]2+* kikolebwa, ekiyita mu kukendeera kuno: BIH Get [RuII(bpy)2(pbn•-)]2+ ne BIH•+. Oluvannyuma, H2O ekola protonate ya ruthenium complex okukola [Ru(bpy)2(pbnH•)]2+ ne BI•. Ekivaamu tekigeraageranye ne kikola [Ru(bpy)2(pbnHH)]2+ ne kidda mu [Ru(bpy)2(pbn)]2+. Eky’olubereberye olwo kikendeezebwa BI• okuvaamu [Ru(bpy)(bpy•−)(pbnHH)]+. Ekizibu kino kirungo ekikola ekikyusa H- okufuuka CO2, ne kikola HCOO- ne formic acid.
Abanoonyereza baalaga nti ensengekera etegekeddwa erina omuwendo gw’okukyusa ogw’amaanyi (omuwendo gwa molekyo za kaboni dayokisayidi ezikyusibwa molekyu emu eya katalisi) – 63.
Abanoonyereza bano basanyufu nnyo olw’ebintu bino bye bazudde era basuubira okukola enkola empya ey’okukyusa amaanyi (omusana okufuuka amasoboza ag’eddagala) okukola ebintu ebipya ebizzibwa obuggya.
"Enkola yaffe era ejja kukendeeza ku muwendo gwonna ogwa kaboni dayokisayidi ku nsi era eyamba okukuuma enzirukanya ya kaboni.N'olwekyo, esobola okukendeeza ku bbugumu ly'ensi mu biseera eby'omu maaso," Pulofeesa Tamiaki bwe yagasseeko. “Okugatta ku ekyo, tekinologiya omupya ow’entambula ya organic hydride ajja kutuwa ebirungo eby’omuwendo ennyo.”
Ebisingawo: Yusuke Kinoshita et al., Okukyusa hayidirayidi y’ebiramu okuleetebwa ekitangaala okudda mu CO2** nga kutabaganyizibwa ebizibu bya ruthenium nga ebikozesebwa ku bafumbo ba NAD +/NADH redox, ChemSusChem (2023). DOI: 10.1002/cssc.202300032

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