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Sikasɛm a ɛkɔ so hwehwɛ pɛtro a mframa bɔne pii wom no ama mframa bɔne (CO2) a ɛwɔ wim no akɔ soro. Sɛ wɔbɔ mmɔden sɛ wɔbɛtew mframa bɔne a wɔtow gu so mpo a, ɛnnɔɔso sɛ wɔbɛdan mframa bɔne a ɛwɔ wim dedaw no.
Enti nyansahufo ayɛ akwan foforo a wɔbɛfa so de carbon dioxide a ɛwɔ wim dedaw no adi dwuma denam no a wɔbɛdan no molecule ahorow a mfaso wɔ so te sɛ formic acid (HCOOH) ne methanol so. Photocatalytic photoreduction of carbon dioxide denam hann a wotumi hu so yɛ ɔkwan a wɔtaa fa so yɛ nsakrae a ɛte saa.
Nyansahufo kuw bi a wofi Tokyo Mfiridwuma Asoɛe a Ɔbenfo Kazuhiko Maeda di wɔn anim no anya nkɔso kɛse na wɔakyerɛw ho asɛm wɔ amanaman ntam nhoma “Angewandte Chemie” a wɔkyerɛw no May 8, 2023 mu.
Wɔyɛɛ tin-based metal-organic framework (MOF) a ɛma wotumi paw carbon dioxide a ɛwɔ hann mu no so tew. Nhwehwɛmufoɔ no yɛ MOF foforɔ a egyina tin (Sn) so a ɛwɔ nnuru a wɔde yɛ [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid ne MeOH: methanol).
CO2 photocatalysts a egyina hann a wotumi hu so a etu mpɔn kɛse no dodow no ara de dade a ɛsom bo a wɔntaa nhu na edi dwuma sɛ wɔn nneɛma atitiriw. Afei nso, hann a wɔtwe ne nea ɛma nneɛma yɛ kɛse a wɔde bɛka molecule biako a dade dodow bi na ɛwom mu no da so ara yɛ asɛnnennen a akyɛ. Enti, Sn yɛ obi a ɔfata efisɛ ebetumi adi ɔhaw abien no nyinaa ho dwuma.
MOFs yɛ nneɛma a eye sen biara a wɔde yɛ dade ne nneɛma a nkwa wom, na wɔresua MOF ahorow ho ade sɛ ɔkwan a ɛyɛ ahabammono a wɔde besi atetesɛm mu hann a ɛyɛ asase a ɛntaa nsi so.
Sn yɛ ade a wobetumi apaw ama MOF-based photocatalysts efisɛ ebetumi ayɛ adwuma sɛ catalyst ne scavenger wɔ photocatalytic nhyehyɛe no mu. Ɛwom sɛ wɔayɛ MOF ahorow a wɔde kɔbere, dade, ne zirconium ayɛ ho nhwehwɛmu kɛse de, nanso wonnim MOF ahorow a wɔde tin ayɛ ho ade pii.
Wɔde H3ttc, MeOH ne tin chloride dii dwuma sɛ nneɛma a wɔde fi ase yɛɛ MOF KGF-10 a wɔde tin ayɛ no, na nhwehwɛmufo no sii gyinae sɛ wɔde 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole bedi dwuma. yɛ adwuma sɛ ɛlɛtrɔnik a wɔde ma ne hydrogen fibea.
Afei wɔde KGF-10 a efi mu ba no yɛ nhwehwɛmu akwan horow. Wohui sɛ ade no wɔ bandgap a ɛyɛ 2.5 eV, ɛtwetwe hann asorɔkye tenten a wotumi hu, na ɛwɔ tumi a ɛtwetwe carbon dioxide a ɛkɔ fam.
Bere a nyansahufo tee ade foforo yi honam fam ne nnuru a ɛwɔ mu no ase wiei no, wɔde dii dwuma de maa carbon dioxide a ɛtew so bere a hann a wotumi hu wɔ hɔ no. Wɔhunuu sɛ KGF-10 tumi dane CO2 yie na ɛpaw no ma ɛbɛyɛ formate (HCOO–) a ɛyɛ adwuma yie a ɛkɔ 99% a enhia sɛ wɔde photosensitizers anaa catalysts foforɔ ba.
Ɛsan nso wɔ kyerɛwtohɔ a ɛkorɔn a ɛda adi sɛ quantum yield (ɛlektrɔn dodow a ɛka ho wɔ adeyɛ no mu ne photon dodow a ɛba nyinaa) a ɛyɛ 9.8% wɔ asorɔkye tenten a ɛyɛ 400 nm. Afei nso, nhyehyɛe mu nhwehwɛmu a wɔyɛe wɔ adeyɛ no nyinaa mu no kyerɛe sɛ KGF-10 nyaa nhyehyɛe mu nsakrae a ɛmaa photocatalytic so tew.
Saa nhwehwɛmu yi de photocatalyst a etu mpɔn kɛse, a ɛwɔ ade biako, a ɛsom bo a dade nnim a wɔde tin ayɛ a ɛma carbon dioxide dan formate ntɛmntɛm ma. KGF-10 su a ɛyɛ nwonwa a kuw no hui no bue akwan foforo a wobetumi de adi dwuma sɛ ade a ɛma hann yɛ hyew wɔ akwan horow te sɛ CO2 a wɔtew so a wɔde owia ahoɔden di dwuma mu.
Ɔbenfo Maeda de baa awiei sɛ: “Nea yenya fii mu bae no kyerɛ sɛ MOF ahorow betumi ayɛ asɛnka agua a wɔde dade a awuduru nnim, ne bo nyɛ den, na asase pii wom di dwuma de yɛ adwuma a ɛkorɔn a ɛma hann yɛ adwuma a mpɛn pii no wontumi nnya denam molecule dade a ɛyɛ den a wɔde di dwuma so.”
Kamakura Y ne ne mfɛfoɔ (2023) Tin(II)-based metal-organic frameworks ma wotumi tew carbon dioxide so yie na wɔpaw ma ɛba wɔ hann a wotumi hu ase. Applied Chemistry, Amanaman Ntam Nkyerɛase. 10.1002/ani.202305923 na ɛyɛ adwuma
Wɔ saa nsɛmbisa yi mu no, Oduruyɛfo Stuart Wright, Nyansahufo Panyin wɔ Gatan/EDAX, ne AZoMaterials susuw sɛnea wɔde electron backscatter diffraction (EBSD) di dwuma pii wɔ nneɛma ho nyansahu ne dade ho nimdeɛ mu ho.
Wɔ saa nsɛmbisa yi mu no, AZoM ne Avantes Product Manager Ger Loop ka Avantes mfeɛ aduasa osuahu a ɛyɛ nwonwa wɔ spectroscopy mu, wɔn asɛmpatrɛ adwuma ne daakye a ɛfa nneɛma a wɔyɛ no ho.
Wɔ saa nsɛmbisa yi mu no, AZoM ne LECO Andrew Storey kasa fa glow discharge spectroscopy ne tumi a LECO GDS950 de ma no ho.
ClearView® mfoninitwa mfiri a ɛma hann a ɛyɛ adwuma yiye no ma ɛlɛtrɔnik mfiri a wɔde hwɛ nneɛma nketenkete (TEM) a wɔde di dwuma daa no yɛ adwuma yiye.
XRF Scientific Orbis Laboratory Jaw Crusher yɛ ade abien a ɛyɛ fɛ a wɔde twitwiw nneɛma a ne jaw crusher a ɛyɛ adwuma yiye no betumi atew nhwɛsode kɛse so akodu ne kɛse a edi kan no mmɔho 55.
Sua Bruer Hysitron PI 89 SEM picoindenter, picoindenter a ɛyɛ foforo a wɔde yɛ in situ quantitative nanomechanical analysis ho ade.
Wiase nyinaa semiconductor gua no ahyɛn bere a ɛyɛ anigye mu. Chip mfiridwuma a wɔhwehwɛ no ama adwuma no anya nkɔso na asiw kwan, na wɔhwɛ kwan sɛ mprempren chip a ɛho yɛ na no bɛkɔ so bere tenten. Ebia nneɛma a ɛrekɔ so mprempren no bɛkyerɛ adwuma no daakye, na saa su yi bɛkɔ so ada adi.
Nsonsonoe titiriw a ɛda graphene batere ne batere a ɛwɔ tebea a ɛyɛ den ntam ne sɛnea electrode biara te. Ɛwom sɛ wɔtaa sesa cathode no de, nanso wobetumi de carbon allotropes nso ayɛ anode ahorow.
Wɔ nnansa yi mfe mu no, ɛkame ayɛ sɛ wɔde nneɛma Intanɛt aba nnwuma nyinaa mu ntɛmntɛm, nanso ɛho hia titiriw wɔ anyinam ahoɔden kar adwumayɛ mu.