Sisebenzisa amakhukhi ukuthuthukisa ulwazi lwakho. Ngokuqhubeka uphequlula le sayithi, uyavuma ukusebenzisa kwethu amakhukhi. Ulwazi olwengeziwe.
Ukuqhubeka kwesidingo somnotho samafutha anekhabhoni ephezulu kuholele ekwandeni kwekhabhoni dioksijini (CO2) emoyeni. Ngisho noma kwenziwa imizamo yokunciphisa ukukhishwa kwekhabhoni dioksijini, ayanele ukuguqula imiphumela eyingozi yegesi esivele ikhona emoyeni.
Ngakho ososayensi basungule izindlela zokudala zokusebenzisa i-carbon dioxide esivele isemkhathini ngokuyiguqula ibe ama-molecule awusizo njenge-formic acid (HCOOH) kanye ne-methanol. Ukunciphisa i-photocatalytic ye-carbon dioxide kusetshenziswa ukukhanya okubonakalayo kuyindlela evamile yokuguqulwa okunjalo.
Ithimba lososayensi abavela eTokyo Institute of Technology, eliholwa nguSolwazi Kazuhiko Maeda, lenze intuthuko enkulu futhi layibhala encwadini yomhlaba wonke ethi “Angewandte Chemie” yangomhlaka-8 Meyi 2023.
Badale uhlaka lwensimbi olusekelwe ku-tin-based metal-organic (MOF) oluvumela ukususwa kwe-carbon dioxide ngokukhetha. Abacwaningi bakha i-MOF entsha esekelwe ku-tin (Sn) ngefomula yamakhemikhali [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid kanye ne-MeOH: methanol).
Ama-photocatalyst e-CO2 asebenza kahle kakhulu asebenzisa izinsimbi eziyigugu ezingavamile njengezingxenye zawo eziyinhloko. Ngaphezu kwalokho, ukuhlanganiswa kokumuncwa kokukhanya kanye nemisebenzi yokuvuselela kube yiyunithi eyodwa yama-molecule eyakhiwe inani elikhulu lezinsimbi kusalokhu kuyinselele yesikhathi eside. Ngakho-ke, i-Sn iyindlela efanelekile ngoba ingaxazulula zombili lezi zinkinga.
Ama-MOF ayizinto ezingcono kakhulu zezinsimbi nezinto eziphilayo, kanti ama-MOF ayafundwa njengendlela engcono kakhulu yokukhetha ama-photocatalyst emvelo angavamile.
I-Sn iyindlela engaba khona yama-photocatalyst asekelwe ku-MOF ngoba ingasebenza njenge-catalyst kanye ne-scavenger ngesikhathi senqubo ye-photocatalytic. Nakuba ama-MOF asekelwe ku-lead, iron, kanye ne-zirconium efundwe kabanzi, kuncane okwaziwayo ngama-MOF asekelwe ku-tin.
I-H3ttc, i-MeOH kanye ne-tin chloride kwasetshenziswa njengezithako zokuqala ukulungiselela i-MOF KGF-10 esekelwe ku-tin, futhi abacwaningi banquma ukusebenzisa i-1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole. isebenza njengomnikeli wama-electron kanye nomthombo we-hydrogen.
I-KGF-10 ephumayo ibe isifakwa ezinqubweni ezahlukahlukene zokuhlaziya. Bathole ukuthi le nto ine-bandgap engu-2.5 eV, imunca amaza okukhanya abonakalayo, futhi inamandla okumunca i-carbon dioxide aphakathi nendawo.
Lapho ososayensi sebeqonda izakhiwo zomzimba nezamakhemikhali zale nto entsha, bayisebenzisela ukwehlisa i-carbon dioxide lapho kukhona ukukhanya okubonakalayo. Bathole ukuthi i-KGF-10 ingaguqula i-CO2 ibe yi-formate (HCOO–) ngempumelelo nangokukhethayo ngokusebenza kahle okufika ku-99% ngaphandle kwesidingo sezinye izinto ezibangela ukuzwela noma ama-catalyst.
Futhi inerekhodi eliphakeme elibonakalayo le-quantum vield (isilinganiso senani lama-electron ahilelekile ekusabeleni enanini eliphelele lama-photon esigameko) elingu-9.8% ku-wavelength engu-400 nm. Ngaphezu kwalokho, ukuhlaziywa kwesakhiwo okwenziwe kulo lonke ukusabela kubonise ukuthi i-KGF-10 yaguqulwa ngokwesakhiwo okwakhuthaza ukunciphisa i-photocatalytic.
Lolu cwaningo luveza okokuqala i-photocatalyst esuselwe ku-tin esebenza kahle kakhulu, enengxenye eyodwa, engenansimbi eyigugu ukuze kusheshiswe ukuguqulwa kwe-carbon dioxide ukuze ibumbeke. Izakhiwo ezimangalisayo ze-KGF-10 ezitholwe yithimba zivula amathuba amasha okusetshenziswa kwayo njenge-photocatalyst ezinqubweni ezifana nokunciphisa ukukhishwa kwe-CO2 kusetshenziswa amandla elanga.
UProfesa Maeda uphethe ngokuthi: “Imiphumela yethu ikhombisa ukuthi ama-MOF angasebenza njengeplatifomu yokusebenzisa izinsimbi ezingenabo ubuthi, ezingabizi kakhulu, nezinothe ngomhlaba ukudala imisebenzi emihle kakhulu ye-photocatalytic evame ukungenzeki ngokusebenzisa ama-molecule metal complexes.”
UKamakura Y nabanye (2023) Uhlaka lwensimbi olusekelwe ku-Tin(II) luvumela ukunciphisa okuphumelelayo nokukhethiwe kwe-carbon dioxide ukuze kwakheke ngaphansi kokukhanya okubonakalayo. I-Applied Chemistry, Uhlelo Lwamazwe Ngamazwe. doi:10.1002/ani.202305923
Kule ngxoxo, uDkt. Stuart Wright, usosayensi omkhulu kwaGatan/EDAX, uxoxa ne-AZoMaterials ngezinhlelo eziningi zokusebenzisa i-electron backscatter diffraction (EBSD) kwisayensi yezinto zokwakha kanye ne-metallurgy.
Kule ngxoxo, i-AZoM ixoxa ngesipiliyoni seminyaka engama-30 esimangalisayo se-Avantes ku-spectroscopy, umsebenzi wabo kanye nekusasa lomkhiqizo ne-Avantes Product Manager uGer Loop.
Kule ngxoxo, i-AZoM ikhuluma no-Andrew Storey we-LECO mayelana ne-spectroscopy yokukhipha ukukhanya kanye namakhono anikezwa yi-LECO GDS950.
Amakhamera e-ClearView® asebenza kahle kakhulu athuthukisa ukusebenza kwe-routine transmission electron microscopy (TEM).
I-XRF Scientific Orbis Laboratory Jaw Crusher iyi-crusher encane enezinyathelo ezimbili esebenza kahle nge-jaw crusher enganciphisa usayizi wesampula ngokuphindwe izikhathi ezingu-55 ngobukhulu bayo bokuqala.
Funda nge-Bruer's Hysitron PI 89 SEM picoindenter, i-picoindenter yesimanje yokuhlaziywa kwe-nanomechanical quantitative in situ.
Imakethe ye-semiconductor yomhlaba wonke isingene enkathini ejabulisayo. Isidingo sobuchwepheshe be-chip siqhube futhi saphazamisa imboni, futhi ukuntuleka kwe-chip kwamanje kulindeleke ukuthi kuqhubeke isikhathi esithile. Izitayela zamanje zingase zibumbe ikusasa lemboni, futhi lo mkhuba uzoqhubeka nokuvela.
Umehluko omkhulu phakathi kwamabhethri e-graphene namabhethri e-solid-state ukwakheka kwe-electrode ngayinye. Nakuba i-cathode ivame ukuguqulwa, ama-allotropes e-carbon angasetshenziswa futhi ukwenza ama-anode.
Eminyakeni yamuva nje, i-Internet of Things iye yafakwa ngokushesha cishe kuzo zonke izimboni, kodwa ibaluleke kakhulu embonini yezimoto zikagesi.