Nhau - Kuwedzera kwekudiwa kwemafuta akagadzirwa nekabhoni kuti ape simba kuhupfumi kuri kuramba kuchiwedzera huwandu hwekabhoni dhayokisaidhi (CO2) mumhepo. Kunyange hazvo kuedza kuri kuitwa kuderedza kuburitswa kweCO2, izvi hazvideredzi migumisiro inokuvadza yegasi riri mumhepo. Saka vaongorori vauya nenzira dzekugadzira dzekushandisa CO2 yemumhepo nekushandura kuita zvinhu zvinokosha zvakaita seformic acid (HCOOH) uye methanol. Kuderedzwa kweCO2 nePhotoreduction uchishandisa maphotocatalysts uchishandisa chiedza chinooneka sechinokonzeresa ndiyo nzira inozivikanwa yekushandura kwakadaro.
Mukuvandudzwa kwazvino, kwakaratidzwa muchinyorwa chepasi rose cheAngewandte Chemie chaMay 8, 2023, chepasi rose, Purofesa Kazuhiko Maeda nechikwata chake chekutsvagisa kuTokyo Institute of Technology vakafambira mberi zvikuru. Vakabudirira kugadzira tin (Sn) metal-organic framework (MOF) inokurudzira kuderedzwa kweCO2. MOF yakaunzwa munguva pfupi yapfuura yakatumidzwa zita rekuti KGF-10 uye fomura yayo yemakemikari ndeye [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid, MeOH: methanol). Ichishandisa chiedza chinooneka, KGF-10 inoshandura CO2 kuita formic acid (HCOOH). Purofesa Maeda akatsanangura kuti, "Kusvika pari zvino, ma photocatalysts akawanda anoshanda zvakanyanya ekuderedza CO2 zvichibva pasimbi dzisingawanzoonekwi uye dzakanaka akagadzirwa. Zvisinei, kubatanidza mabasa ekudzivirira chiedza uye ekugadzirisa chiedza muchikamu chimwe chete chemorekuru chakaumbwa nesimbi dzakawanda kuchiri dambudziko." Saka, Sn yakaratidza kuva munhu akakodzera kukunda zvipingamupinyi zviviri izvi."
MOFs, dzinosanganisa zvakanakira simbi nezvinhu zve organic, dziri kuongororwa senzira yekusarudza ma photocatalysts echinyakare akavakirwa pasimbi dzisina kujairika. Sn, inozivikanwa nebasa rayo rechipiri se catalyst uye light absorber mumaitiro e photocatalyst, inogona kunge iri sarudzo inoshanda kune ma photocatalysts akavakirwa pa MOF. Kunyangwe ma MOFs anoumbwa ne zirconium, iron, uye lead akaongororwa zvakanyanya, kunzwisisa ma Sn-based MOFs kuchiri kushoma. Zvimwe zvidzidzo nezvidzidzo zvinodiwa kuti tiongorore zvizere mikana uye mashandisirwo anogona kuitwa ma Sn-based MOFs mumunda we photocatalysis.
Kuti vagadzire MOF KGF-10 yakagadzirwa netin, vaongorori vakashandisa H3ttc (trithiocyanuric acid), MeOH (methanol), uye tin chloride sezvinhu zvekutanga. Vakasarudza 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole senzvimbo yekupa maerekitironi uye hydrogen. Mushure mekugadzira, KGF-10 yakawanikwa yakaongororwa nenzira dzakasiyana-siyana. Miedzo iyi yakaratidza kuti chinhu ichi chine mukana weCO2 adsorption une band gap ye2.5 eV uye inonyudzwa zvinobudirira muhuwandu hwewavelength hunoonekwa.
Vaine ruzivo rwezvinhu zvemuviri uye zvemakemikari zvechinhu chitsva ichi, masayendisiti akachishandisa kukurudzira kudzikiswa kwecarbon dioxide nechiedza chinoonekwa. Zvinonyanya kukosha, vaongorori vakaona kuti KGF-10 inoita kuti CO2 iite (HCOO-) ishandurwe ne99% selectivity pasina assistant photosensitizer kana catalyst. Pamusoro pezvo, KGF-10 yakaratidza quantum goho rakakwirira risingaenzaniswi - chiyero chekushanda kwekushandisa maphoton - kusvika pa9.8% pa400 nm. Zvinonyanya kukosha, ongororo yechimiro yakaitwa panguva ye photocatalytic reaction yakaratidza kuti KGF-10 inogadziriswa chimiro kuti ibatsire mukudzikiswa kwechinhu ichi.
Tsvagiridzo iyi inoshamisa inoratidza KGF-10 ine tin-based photocatalyst inoshanda zvakanaka pasina chikonzero chesimbi dzakanaka sechinhu chinobatsira kuderedza CO2 kuti iumbwe nechiedza chinoonekwa. Hunhu hunoshamisa hweKGF-10 hwakaratidzwa muchidzidzo ichi hunogona kuchinja kushandiswa kwayo se photocatalyst mumabasa akasiyana-siyana, kusanganisira kuderedza CO2 kubva muzuva. Purofesa Maeda anopedzisa achiti: "Zvatakawana zvinoratidza kuti MOFs dzinogona kushanda sepuratifomu yekuvandudza kugona kwe photocatalytic kwepamusoro-soro uchishandisa simbi dzisina chepfu, dzisingadhuri uye dzakawanda dzinowanikwa paNyika, idzo dzinowanzova molecular metal complexes. Hazvigoneki." Kuwanikwa uku kunovhura mikana mitsva, maonero matsva mumunda we photocatalysis uye kunovhura nzira yekushandiswa kwenguva refu uye nemazvo kwezviwanikwa zvePasi.
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