Peb siv cov ncuav qab zib los txhim kho koj qhov kev paub. Los ntawm kev txuas ntxiv mus saib lub xaib no, koj pom zoo rau peb siv cov ncuav qab zib. Xav paub ntxiv.
Qhov kev lag luam xav tau roj uas muaj cov pa roj carbon ntau ntxiv ua rau muaj cov pa roj carbon dioxide (CO2) ntau ntxiv hauv huab cua. Txawm tias muaj kev siv zog los txo cov pa roj carbon dioxide los xij, lawv tsis txaus los kho cov teeb meem ntawm cov pa roj uas twb muaj nyob hauv huab cua lawm.
Yog li ntawd, cov kws tshawb fawb tau tsim cov tswv yim tshiab los siv cov pa roj carbon dioxide uas twb muaj nyob hauv huab cua los ntawm kev hloov nws mus ua cov tshuaj muaj txiaj ntsig xws li formic acid (HCOOH) thiab methanol. Kev siv photocatalytic photoreduction ntawm cov pa roj carbon dioxide siv lub teeb pom kev zoo yog ib txoj hauv kev siv ntau rau kev hloov pauv zoo li no.
Ib pab pawg kws tshawb fawb los ntawm Tokyo Institute of Technology, coj los ntawm Xibfwb Kazuhiko Maeda, tau ua tiav kev vam meej loj thiab tau sau tseg rau hauv phau ntawv xov xwm thoob ntiaj teb "Angewandte Chemie" hnub tim 8 Tsib Hlis, 2023.
Lawv tau tsim ib lub tin-based metal-organic framework (MOF) uas ua rau muaj kev xaiv photoreduction ntawm carbon dioxide. Cov kws tshawb fawb tsim ib lub tin (Sn)-based MOF tshiab nrog cov mis tshuaj [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid thiab MeOH: methanol).
Feem ntau cov khoom siv hluav taws xob CO2 uas pom tau zoo siv cov hlau tsis tshua muaj nqis ua lawv cov khoom tseem ceeb. Ntxiv mus, kev koom ua ke ntawm kev nqus lub teeb thiab cov haujlwm catalytic rau hauv ib chav tsev molecular uas muaj ntau cov hlau tseem yog qhov kev sib tw ntev. Yog li, Sn yog tus neeg sib tw zoo tagnrho vim nws tuaj yeem daws ob qho teeb meem.
MOFs yog cov ntaub ntawv zoo tshaj plaws rau cov hlau thiab cov ntaub ntawv organic, thiab MOFs raug kawm ua lwm txoj hauv kev ntsuab dua li cov photocatalysts hauv ntiaj teb tsis tshua muaj.
Sn yog ib qho kev xaiv zoo rau cov photocatalysts raws li MOF vim nws tuaj yeem ua haujlwm ua tus catalyst thiab scavenger thaum lub sijhawm photocatalytic. Txawm hais tias cov MOFs ua los ntawm txhuas, hlau, thiab zirconium tau raug kawm ntau yam, me ntsis paub txog MOFs ua los ntawm tin.
H3ttc, MeOH thiab tin chloride tau siv ua cov khoom xyaw pib los npaj cov tin-based MOF KGF-10, thiab cov kws tshawb fawb tau txiav txim siab siv 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole. ua haujlwm ua tus pub hluav taws xob thiab qhov chaw ntawm hydrogen.
Cov KGF-10 uas tau los ntawm kev siv ntau yam txheej txheem tshuaj xyuas. Lawv pom tias cov khoom siv no muaj bandgap ntawm 2.5 eV, nqus tau cov wavelengths ntawm lub teeb pom kev, thiab muaj peev xwm nqus tau cov pa roj carbon dioxide nruab nrab.
Thaum cov kws tshawb fawb nkag siab txog cov khoom siv tshiab no lub cev thiab tshuaj lom neeg, lawv siv nws los ua kom cov pa roj carbon dioxide txo qis thaum muaj lub teeb pom kev zoo. Lawv pom tias KGF-10 tuaj yeem hloov CO2 mus rau formate (HCOO-) tau zoo thiab xaiv tau txog li 99% yam tsis tas yuav siv cov tshuaj photosensitizers lossis catalysts ntxiv.
Nws kuj muaj cov ntaub ntawv siab tshaj plaws ntawm cov quantum yield (qhov piv ntawm tus naj npawb ntawm cov electrons koom nrog hauv cov tshuaj tiv thaiv rau tag nrho cov photons tshwm sim) ntawm 9.8% ntawm qhov ntev ntawm 400 nm. Ntxiv mus, kev tshuaj xyuas cov qauv uas tau ua thoob plaws hauv qhov tshuaj tiv thaiv qhia tau tias KGF-10 tau dhau los ua cov qauv hloov kho uas txhawb nqa kev txo qis photocatalytic.
Txoj kev tshawb fawb no tau nthuav tawm thawj zaug ib qho tshuaj photocatalyst uas muaj zog heev, ib qho khoom, tsis muaj hlau muaj nqis uas siv tin los ua kom cov pa roj carbon dioxide hloov mus ua formate sai dua. Cov yam ntxwv zoo kawg ntawm KGF-10 uas pab pawg neeg tau tshawb pom qhib cov cib fim tshiab rau nws siv ua photocatalyst hauv cov txheej txheem xws li txo cov pa roj carbon dioxide siv lub zog hnub ci.
Xibfwb Maeda xaus lus tias: "Peb cov txiaj ntsig qhia tau tias MOFs tuaj yeem ua lub platform rau kev siv cov hlau tsis muaj tshuaj lom, pheej yig, thiab nplua nuj hauv ntiaj teb los tsim cov haujlwm photocatalytic zoo dua uas feem ntau tsis tuaj yeem ua tiav los ntawm kev siv cov hlau molecular complexes."
Kamakura Y et al (2023) Tin (II)-raws li hlau-organic frameworks ua rau muaj kev txo qis thiab xaiv cov pa roj carbon dioxide rau hauv qab lub teeb pom kev zoo. Applied Chemistry, International Edition. doi:10.1002/ani.202305923
Hauv kev xam phaj no, Dr. Stuart Wright, Tus Kws Tshawb Fawb Qib Siab ntawm Gatan/EDAX, tham nrog AZoMaterials txog ntau yam kev siv ntawm electron backscatter diffraction (EBSD) hauv kev tshawb fawb txog cov ntaub ntawv thiab metallurgy.
Hauv kev xam phaj no, AZoM tham txog Avantes txoj kev paub txog 30 xyoo hauv kev soj ntsuam spectroscopy, lawv lub hom phiaj thiab yav tom ntej ntawm cov khoom lag luam nrog Avantes Product Manager Ger Loop.
Hauv kev xam phaj no, AZoM tham nrog LECO's Andrew Storey txog kev ntsuas qhov ci ntsa iab thiab cov peev xwm uas LECO GDS950 muab.
Cov koob yees duab scintillation ClearView® ua haujlwm tau zoo txhim kho kev ua haujlwm ntawm kev siv lub tshuab kuaj hluav taws xob (TEM).
Lub XRF Scientific Orbis Laboratory Jaw Crusher yog lub tshuab zom khoom me me uas muaj ob txoj haujlwm uas nws lub zog zom khoom tuaj yeem txo qhov loj ntawm cov qauv mus txog 55 npaug ntawm nws qhov loj thawj.
Kawm txog Bruer's Hysitron PI 89 SEM picoindiner, lub picoindiner tshiab tshaj plaws rau kev tshuaj xyuas cov khoom siv nanomechanical hauv qhov chaw.
Kev lag luam thoob ntiaj teb semiconductor tau nkag mus rau lub sijhawm zoo siab. Kev thov rau cov thev naus laus zis chip tau tsav thiab cuam tshuam kev lag luam, thiab qhov tsis txaus chip tam sim no yuav txuas ntxiv mus rau ib ntus. Cov qauv tam sim no yuav hloov pauv yav tom ntej ntawm kev lag luam, thiab qhov qauv no yuav txuas ntxiv mus.
Qhov sib txawv tseem ceeb ntawm cov roj teeb graphene thiab cov roj teeb solid-state yog cov khoom sib xyaw ntawm txhua lub electrode. Txawm hais tias cathode feem ntau yog hloov kho, allotropes ntawm carbon kuj tseem siv tau los ua anodes.
Nyob rau xyoo tas los no, Is Taws Nem ntawm Yam tau raug coj los siv rau hauv yuav luag txhua yam lag luam, tab sis nws tseem ceeb heev rau kev lag luam tsheb fais fab.