Izindaba - Isidingo esikhulayo samafutha asekelwe ku-carbon ukuze afukule umnotho siyaqhubeka nokwandisa inani le-carbon dioxide (CO2) emoyeni. Ngenkathi kwenziwa imizamo yokunciphisa ukukhishwa kwe-CO2, lokhu akunciphisi imiphumela eyingozi yegesi esivele isemkhathini. Ngakho abacwaningi baqhamuke nezindlela zokudala zokusebenzisa i-CO2 esemkhathini ngokuyiguqula ibe yizinto ezibalulekile njenge-formic acid (HCOOH) kanye ne-methanol. Ukunciphisa i-CO2 nge-photoreduction kusetshenziswa ama-photocatalyst kusetshenziswa ukukhanya okubonakalayo njenge-catalyst kuyindlela ethandwayo yokuguqulwa okunjalo.
Empumelelweni yakamuva, eyembulwe kuhlelo lwamazwe ngamazwe lwe-Angewandte Chemie lwangoMeyi 8, 2023, uSolwazi Kazuhiko Maeda kanye nethimba lakhe locwaningo eTokyo Institute of Technology benze intuthuko enkulu. Bathuthukise ngempumelelo uhlaka lwe-tin (Sn) metal-organic (MOF) olukhuthaza ukususwa kwe-CO2 okukhethiwe. I-MOF esanda kwethulwa yaqanjwa ngokuthi i-KGF-10 futhi ifomula yayo yamakhemikhali yi-[SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid, MeOH: methanol). Ngokusebenzisa ukukhanya okubonakalayo, i-KGF-10 iguqula ngempumelelo i-CO2 ibe yi-formic acid (HCOOH). USolwazi Maeda wachaza, “Kuze kube manje, kuye kwasungulwa ama-photocatalyst amaningi asebenza kahle kakhulu okunciphisa i-CO2 ngokusekelwe ezinsimbini ezingavamile nezihloniphekile. Kodwa-ke, ukuhlanganisa imisebenzi yokumunca ukukhanya kanye ne-catalytic kuyunithi eyodwa yama-molecule eyakhiwe inani elikhulu lezinsimbi kuseyinselele.” Ngakho-ke, uSn wazibonakalisa engumuntu ofanele ukunqoba lezi zithiyo ezimbili.”
Ama-MOF, ahlanganisa izinzuzo zezinsimbi nezinto eziphilayo, ayahlolwa njengendlela engcono kakhulu kune-photocatalyst yendabuko esekelwe ezinsimbini ezingavamile zomhlaba. I-Sn, eyaziwa ngendima yayo ephindwe kabili njenge-catalyst kanye ne-light absorber ezinqubweni ze-photocatalyst, ingaba inketho efanelekile yama-photocatalyst asekelwe ku-MOF. Nakuba ama-MOF akhiwe yi-zirconium, insimbi, kanye ne-lead efundwe kabanzi, ukuqonda ama-MOF asekelwe ku-Sn kusalinganiselwe. Kudingeka izifundo ezengeziwe kanye nezifundo ukuze kuhlolwe ngokugcwele amathuba kanye nokusetshenziswa okungenzeka kwama-MOF asekelwe ku-Sn emkhakheni we-photocatalysis.
Ukuze kuhlanganiswe i-MOF KGF-10 esekelwe ku-tin, abacwaningi basebenzise i-H3ttc (i-trithiocyanuric acid), i-MeOH (i-methanol), kanye ne-tin chloride njengezingxenye zokuqala. Bakhethe i-1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole njengomnikeli we-electron kanye nomthombo we-hydrogen. Ngemva kokuhlanganiswa, i-KGF-10 etholiwe yahlolwa ngezindlela ezahlukene zokuhlaziya. Lokhu kuhlolwa kubonise ukuthi izinto zinamandla okumunca i-CO2 aphakathi nendawo anegebe lebhendi elingu-2.5 eV kanye nokumunca okuphumelelayo ebangeni lobude be-wavelength obubonakalayo.
Behlome ngolwazi lwezakhiwo zomzimba nezamakhemikhali zale nto entsha, ososayensi bayisebenzisela ukukhulisa ukwehla kwe-carbon dioxide ngokukhanya okubonakalayo. Okuphawulekayo ukuthi abacwaningi bathole ukuthi i-KGF-10 ifinyelela ukuguqulwa kwe-CO2 ukuze ibumbe (i-HCOO-) ngokukhetha okufika ku-99% ngaphandle kwe-photosensitizer noma i-catalyst esekelayo. Ngaphezu kwalokho, i-KGF-10 ibonise isivuno se-quantum esiphezulu kakhulu esingakaze sibonwe - isilinganiso sokusebenza kahle kokusebenzisa ama-photon - esifinyelela inani elingu-9.8% ku-400 nm. Okuphawulekayo ukuthi ukuhlaziywa kwesakhiwo okwenziwe ngesikhathi sokusabela kwe-photocatalytic kubonise ukuthi i-KGF-10 idlula ekuguqulweni kwesakhiwo ukusiza enqubweni yokunciphisa.
Lolu cwaningo oluqavile luveza i-photocatalyst esekwe ku-tin esebenza kahle kakhulu i-KGF-10 engenasidingo sezinsimbi ezinhle njengesikhuthazi sendlela eyodwa sokunciphisa i-CO2 ukuze yakheke ngokukhanya okubonakalayo. Izakhiwo ezimangalisayo ze-KGF-10 eziboniswe kulolu cwaningo zingaguqula ukusetshenziswa kwayo njenge-photocatalyst ezinhlotsheni ezahlukene zokusebenza, okuhlanganisa nokunciphisa i-CO2 yelanga. UProfesa Maeda uphetha ngokuthi: “Imiphumela yethu ikhombisa ukuthi ama-MOF angasebenza njengeplatifomu yokuthuthukiswa kwamakhono aphezulu e-photocatalytic kusetshenziswa izinsimbi ezingenabo ubuthi, ezingabizi kakhulu neziningi ezitholakala eMhlabeni, ezivame ukuba yizinkimbinkimbi zensimbi yama-molecule. Akutholakali.” Lokhu kutholwa kuvula amathuba amasha. izindawo ezintsha emkhakheni we-photocatalysis futhi kuvula indlela yokusetshenziswa okuqhubekayo nokusebenza kahle kwezinsizakusebenza zoMhlaba.
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