Newswise – Kei te piki haere tonu te hiahia mō ngā wahie waro-hauora hei whakakaha i te ōhanga, ā, kei te piki haere tonu te nui o te hauhā waro (CO2) i te rangi. Ahakoa kei te whakapau kaha ki te whakaiti i ngā tukunga CO2, kāore tēnei e whakaiti i ngā pānga kino o te hau kei roto i te rangi. Nō reira, kua kitea e ngā kairangahau he huarahi auaha hei whakamahi i te CO2 o te rangi mā te huri hei matū whai hua pēnei i te waikawa formic (HCOOH) me te methanol. Ko te whakaiti whakaahua o te CO2 mā te whakamahi i ngā kaiwhakaoho whakaahua mā te whakamahi i te mārama kitea hei kaiwhakaoho he tikanga rongonui mō ēnei huringa.
I roto i te putanga hou, i whakakitea i te putanga ā-ao o Angewandte Chemie i te 8 o Mei, 2023, kua tino ahu whakamua a Ahorangi Kazuhiko Maeda me tana rōpū rangahau i te Whare Wānanga Hangarau o Tōkyō. Kua angitu tā rātou whakawhanake i tētahi anga whakarewa-ora (MOF) tine (Sn) e whakatairanga ana i te whakaiti whakaahua whiriwhiri o te CO2. Ko te ingoa o te MOF i whakaurua tata nei ko KGF-10, ā, ko tōna tauira matū ko [SnII2(H3ttc)2.MeOH]n (H3ttc: waikawa trithiocyanuric, MeOH: methanol). Mā te whakamahi i te mārama e kitea ana, ka huri pai a KGF-10 i te CO2 ki te waikawa formic (HCOOH). I whakamārama a Ahorangi Maeda, "Tae noa ki tēnei wā, he maha ngā kaiwhakaara whakaahua tino whai hua mō te whakaiti CO2 i runga i ngā konganuku onge me ngā konganuku rangatira kua whakawhanakehia. Heoi, ko te whakauru i ngā mahi mimiti mārama me te whakatere ki roto i tētahi waeine ngota kotahi i titoa mai i te tini o ngā konganuku he wero tonu." Nō reira, i kitea ko Sn te kaitono pai hei wikitoria i ēnei arai e rua."
Kei te tūhuratia ngā MOF, e whakakotahi ana i ngā painga o ngā konganuku me ngā rauemi rauropi, hei huarahi kē atu i ngā kaiwhakaoho whakaahua tuku iho i ahu mai i ngā konganuku whenua onge. Ko te Sn, e mōhiotia ana mō tōna tūranga rua hei kaiwhakaoho me te mimiti mārama i roto i ngā tukanga whakaoho whakaahua, he kōwhiringa pai pea mō ngā kaiwhakaoho whakaahua e ahu mai ana i te MOF. Ahakoa kua rangahauhia whānuitia ngā MOF i hangaia mai i te zirconium, te rino, me te mata, he iti tonu te māramatanga ki ngā MOF e ahu mai ana i te Sn. Me whai atu rangahau me ngā rangahau hei tūhura katoa i ngā mea ka taea me ngā tono pea o ngā MOF e ahu mai ana i te Sn i roto i te mara o te whakaoho whakaahua.
Hei hanga i te MOF KGF-10 e ahu mai ana i te tine, i whakamahia e ngā kairangahau te H3ttc (waikawa trithiocyanuric), te MeOH (methanol), me te tine chloride hei wāhanga tīmatanga. I whiriwhiria e rātou te 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole hei kaituku irahiko me te pūtake hauwai. I muri i te hanga, i tukuna te KGF-10 i whiwhi ki ngā tikanga tātari maha. I whakaatuhia e ēnei whakamātautau he kaha mimiti CO2 taurite te rauemi me te āputa roopu o te 2.5 eV me te mimiti whai hua i roto i te awhe roangaru e kitea ana.
I runga i te mōhiotanga ki ngā āhuatanga ā-tinana me te matū o te rauemi hou, i whakamahia e ngā kaipūtaiao hei whakatere i te whakaiti i te hauhā waro mā te mārama e kitea ana. He mea nui, i kitea e ngā kairangahau ka tutuki i te KGF-10 te huringa CO2 hei hanga (HCOO-) me te whiriwhiringa tae atu ki te 99% me te kore he kaiwhakaoho whakaahua āwhina, he whakaoho rānei. Hei tāpiri, i whakaatu a KGF-10 i te hua quantum kitea tino teitei - he ine i te whai huatanga o te whakamahi i ngā photon - tae atu ki te uara o te 9.8% i te 400 nm. He mea nui, ko te tātari hanganga i mahia i te wā o te tauhohenga whakaahua i whakaatu kua pāngia te KGF-10 e te whakarerekētanga hanganga hei āwhina i te tukanga whakaiti.
E whakaatu ana tēnei rangahau hou i tētahi kaiwhakaoho whakaahua KGF-10 e ahu mai ana i te tine, he mahi teitei, kāore he take mō ngā konganuku rangatira hei kaiwhakaoho kotahi-ara mō te whakaiti i te CO2 kia puta mai i te mārama e kitea ana. Ko ngā āhuatanga whakamiharo o KGF-10 i whakaaturia i roto i tēnei rangahau ka taea te huri i tōna whakamahinga hei kaiwhakaoho whakaahua i roto i ngā momo tono, tae atu ki te whakaiti i te CO2 mai i te rā. Ko te whakatau a Ahorangi Maeda: "E whakaatu ana ā mātou hua ka taea e ngā MOF te mahi hei tūāpapa mō te whakawhanake i ngā kaha whakaoho whakaahua pai ake mā te whakamahi i ngā konganuku kore-paitini, utu-whai hua, me te nui e kitea ana i runga i te Ao, he maha ngā wā he matatini konganuku ngota. Kāore e taea te whakatutuki." Ka whakatuwherahia e tēnei kitenga ngā huarahi hou. ngā pae tawhiti i roto i te mara o te whakaoho whakaahua, ā, ka whakatakoto i te ara mō te whakamahinga pumau me te whai hua o ngā rauemi o te Ao.
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