Makani – Kuyungizya kuyandika kwamafuta aajisi kaboni kuti ayungizye buvubi kuzumanana kuyungizya mweelwe wa kaboni dayokisayidi (CO2) mumuwo. Nikuba kuti kusoleka kuchitwa kuchesya CO2, eezi tazigwisyi ntenda zya muya uuli kale mumulengalenga. Aboobo basikuvwuntauzya bakajana nzila zyakubelesya CO2 iili mumulengalenga kwiinda mukuisandula kuba zintu ziyandisi mbuli formic acid (HCOOH) a methanol. Kugwisya CO2 kwiinda mukubelesya mumuni uuzwa mumuni kubelesya mumuni uulibonya mbuli chintu chipa kuti kube kuchincha ninzila iizyibidwe kapati yakusandula zintu ziliboobu.
Mukuzwidilila kwamazubaano, kwakayubununwa mu May 8, 2023, bbuku lyanyika yoonse lya Angewandte Chemie, Mufundisi Kazuhiko Maeda abasikuvwuntauzya bakwe ku Tokyo Institute of Technology bakachita kuyaambele kupati. Bakazwidilila mukupanga chintu (Sn) cha metal-organic framework (MOF) chisumpula kusalwa kwa CO2. MOF yakatalisyigwa ino-ino yakapegwa zina lyakuti KGF-10 mpawo fomuyula yayo [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid, MeOH: methanol). Kubelesya mumuni uulibonya, KGF-10 ilasandula CO2 kuba asidi (HCOOH). Mufundisi Maeda wakapandulula kuti, "Kusikila sunu, zintu zyiingi zigwasya kapati mukucesya CO2 ziyeeme azintu zitavwuli kujanika alimwi zisumpukide zyakabambwa. Nokuba boobo, kuswaanganya milimo yakuyobola mumuni alimwi akugwasya kuti mumuni ubelesyegwe mucintu comwe cijisi zintu zinji zyabutale kucili cintu cikatazya." Aboobo, Sn wakatondezya kuba muntu uukonzya kuzunda buyumuyumu oobu bobile.”
Ma MOF, aayo aswaanganya bubotu bwazibulo azintu zipona, ali mukulingulwa kuti abe nzila imwi iitakwe busani kunze lyazibelesyo zyamumuni zyakale zibelesya zibulo zitavwuli kujanika. Sn, iizyibidwe amulimu wayo wabili mbuli sikugwasya akutola mumuni munzila zyamumuni, ilakonzya kuba nzila mbotu ya MOF-based photocatalysts. Nikuba kuti ma MOFs ajisi zirconium, iron, a lead akavwuntauzyigwa loko, kumvwisisisya kwa Sn-based MOFs kuchili kusyoonto. Ziiyo zimbi ziyandikana kuti kuvwuntauzyigwe zyoonse zikonzya kubelesegwa a Sn-based MOFs mumulimo wa photocatalysis.
Kupanga MOF KGF-10, basikuvwuntauzya bakabelesya H3ttc (trithiocyanuric acid), MeOH (methanol), antoomwe a tin chloride mbuli zintu zyakutalisya. Bakasala 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole kuti ibe nzila yakupa ma electron antoomwe a hydrogen. Musule akupanga, KGF-10 yakajanwa yakabikkwa munzila zyakuvwuntauzya ziindene. Eeyi misunko yakatondezya kuti eechi chintu chili aanguzu zyakunyona CO2 zili akati-akati antoomwe a band gap ya 2.5 eV antoomwe akunyona kubotu mu wavelength range iilibonya.
Kabajisi luzibo lwabube bwazintu zipya, basayaansi bakazibelesya kugwasya kuchesya muya uutegwa carbon dioxide kwiinda mumumuni uulibonya. Chazibinkene, basikuvwuntauzya bakajana kuti KGF-10 ilakonzya kusanduka kuzwa ku CO2 kuya ku formate (HCOO-) a 99% yakusala kakunyina chimwi chintu chigwasya kuzuzya mumuni. Mukuyungizya, KGF-10 yakatondezya kuvwula kwa quantum yield - mweelwe wakubelesya ma photons - kusikila ku 9.8% a 400 nm. Chazibinkene, kuvwuntauzya kwabupange kwakachitwa muchiindi cha photocatalytic reaction kwakatondezya kuti KGF-10 yakachinchwa bupange bwayo kuti igwasye munzila yakucesya.
Ooku kuvwuntauzya kwakusaanguna kutondezya chintu chibeleka obotu cha KGF-10 kakunyina kuyandika zintu zibotu mbuli nzila yomwe yakugwisya CO2 kuti ichite mumuni uulibonya. Bube bugambya bwa KGF-10 bwakatondezyegwa muchiiyo eechi bulakonzya kuchincha kubelesegwa kwawo mbuli chintu chipa kuti zuba libe amumuni muzintu zyiingi, kubikkilizya akucesya CO2 kuzwa kuzuba. Mufundisi Maeda wamanizya kuti: "Zyakajanwa kulindiswe zitondezya kuti ma MOF alakonzya kubeleka mbuli nzila yakusumpula nguzu zyakubelesya zuba kubelesya zintu zitakwe tombe, zitayandiki mali manji alimwi zilinji kapati zijanika anyika, eezyo kanjikanji zili mbuli zintu zipangidwe aama molecule. Tazikonzyi kujanwa pe." Ooku kujana kwajalula nzila zipya. zintu zipya mumulimo wa photocatalysis mpawo zilajalula nzila yakubelesya kabotu zintu zyaanyika.
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