Sisebenzisa iikuki ukuphucula amava akho. Ngokuqhubeka ukhangela le sayithi, uyavuma ukuba sisebenzise iikuki. Ulwazi oluthe kratya.
Ukuqhubeka kwemfuno yezoqoqosho yamafutha anekhabhoni ephezulu kukhokelele ekwandeni kwekhabhoni diokside (CO2) emoyeni. Nokuba kwenziwa imizamo yokunciphisa ukukhutshwa kwekhabhoni diokside, ayanelanga ukuguqula iziphumo eziyingozi zegesi esele ikwimoya.
Ngoko ke izazinzulu ziye zaphuhlisa iindlela zobuchule zokusebenzisa ikharbon diokside esele ikwimo engqongileyo ngokuyiguqula ibe ziimolekyuli eziluncedo ezifana ne-formic acid (HCOOH) kunye ne-methanol. Ukunciphisa i-photocatalytic photoreduction yekharbon diokside kusetyenziswa ukukhanya okubonakalayo yindlela eqhelekileyo yotshintsho olunjalo.
Iqela lezazinzulu ezivela kwiTokyo Institute of Technology, elikhokelwa nguNjingalwazi uKazuhiko Maeda, lenze inkqubela phambili enkulu kwaye layibhala phantsi kwincwadi yehlabathi ethi “Angewandte Chemie” yomhla wesi-8 kuMeyi 2023.
Badale i-metal-organic framework (MOF) esekwe kwi-tin evumela ukususwa kwe-carbon dioxide ngokukhetha. Abaphandi benze i-MOF entsha esekelwe kwi-tin (Sn) ngefomyula yeekhemikhali [SnII2(H3ttc)2.MeOH]n (H3ttc: trithiocyanuric acid kunye neMeOH: methanol).
Ii-photocatalysts ze-CO2 ezibonakalayo nezisebenza kakuhle kakhulu zisebenzisa iintsimbi ezinqabileyo ezinqabileyo njengezinto eziphambili. Ngaphezu koko, ukuhlanganiswa kwemisebenzi yokufunxwa kokukhanya kunye nemisebenzi yokutsala amandla kwiyunithi enye yemolekyuli eyenziwe linani elikhulu leentsimbi kusaqhubeka nokuba ngumceli mngeni ohlala ixesha elide. Ngoko ke, i-Sn ngumviwa ofanelekileyo kuba inokusombulula zombini ezi ngxaki.
Ii-MOF zezona zinto zibalaseleyo kwisinyithi nakwizinto eziphilayo, kwaye ii-MOF zifundwa njengendlela eluhlaza endaweni yee-photocatalysts zemveli zendalo ezingaqhelekanga.
I-Sn lukhetho olunokwenzeka kwii-photocatalysts ezisekwe kwi-MOF kuba inokusebenza njenge-catalyst kunye ne-scavenger ngexesha lenkqubo ye-photocatalytic. Nangona ii-MOF ezisekwe kwi-lead, i-iron, kunye ne-zirconium ziye zafundwa ngokubanzi, kuncinci okwaziwayo malunga nee-MOF ezisekwe kwi-tin.
I-H3ttc, i-MeOH kunye ne-tin chloride zisetyenzisiwe njengezithako zokuqala ukulungiselela i-MOF KGF-10 esekwe kwi-tin, kwaye abaphandi bagqibe ekubeni basebenzise i-1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole. isebenza njengomnikeli we-electron kunye nomthombo we-hydrogen.
I-KGF-10 ephumayo emva koko ifakwa kwiinkqubo ezahlukeneyo zohlalutyo. Bafumanise ukuba le nto ine-bandgap ye-2.5 eV, ifunxa ubude bokukhanya obubonakalayo, kwaye inomthamo ophakathi wokufunxa i-carbon dioxide.
Nje ukuba izazinzulu ziqonde iimpawu zomzimba nezekhemikhali zale nto intsha, zayisebenzisa ukunyusa izinga lokunciphisa i-carbon dioxide xa kukho ukukhanya okubonakalayo. Bafumanise ukuba i-KGF-10 inokuguqula i-CO2 ibe yi-formate (HCOO–) ngokufanelekileyo nangokukhethayo ngokusebenza ukuya kuthi ga kwi-99% ngaphandle kwemfuneko yokongezwa kwee-photosensitizers okanye ii-catalysts.
Ikwanayo nerekhodi ephezulu ebonakalayo ye-quantum yield (umlinganiselo wenani lee-electron ezibandakanyekayo kwimpendulo kwinani lilonke lee-photon zesiganeko) ze-9.8% kubude bobude be-400 nm. Ngaphezu koko, uhlalutyo lwesakhiwo olwenziwe kulo lonke uphendulo lubonise ukuba i-KGF-10 iye yaguqulwa kwisakhiwo eyakhuthaza ukunciphisa i-photocatalytic.
Olu phononongo luveza okokuqala i-photocatalyst esebenza kakuhle kakhulu, enenxalenye enye, nexabisekileyo engenasinyithi ukuze ikhawulezise ukuguqulwa kwe-carbon dioxide ukuze ibumbeke. Iimpawu ezimangalisayo ze-KGF-10 ezifunyenwe liqela zivula amathuba amatsha okusetyenziswa kwayo njenge-photocatalyst kwiinkqubo ezinje ngokunciphisa ukukhutshwa kwe-CO2 kusetyenziswa amandla elanga.
UNjingalwazi Maeda ugqibe ngelithi: “Iziphumo zethu zibonisa ukuba ii-MOF zingasebenza njengeqonga lokusebenzisa iintsimbi ezingenabungozi, ezingabizi kakhulu, nezityebileyo emhlabeni ukwenza imisebenzi ephezulu ye-photocatalytic edla ngokungafumanekiyo ngokusebenzisa ii-molecule metal complexes.”
UKamakura Y et al (2023) Izakhiwo zesinyithi-zendalo ezisekelwe kwi-Tin(II) zivumela ukunciphisa okusebenzayo nokukhethiweyo kwe-carbon dioxide ukuba ivele phantsi kokukhanya okubonakalayo. I-Applied Chemistry, Uhlelo lwaMazwe ngaMazwe. doi:10.1002/ani.202305923
Kolu dliwanondlebe, uGqr. Stuart Wright, isazinzulu esiPhezulu eGatan/EDAX, uxoxa ne-AZoMaterials ngezicelo ezininzi ze-electron backscatter diffraction (EBSD) kwisayensi yezinto kunye ne-metallurgy.
Kolu dliwanondlebe, i-AZoM ixoxa ngamava amangalisayo eminyaka engama-30 e-Avantes kwi-spectroscopy, umsebenzi wabo kunye nekamva lomgca wemveliso kunye ne-Avantes Product Manager uGer Loop.
Kolu dliwanondlebe, i-AZoM ithetha no-Andrew Storey we-LECO malunga ne-glow discharge spectroscopy kunye nobuchule obunikezelwa yi-LECO GDS950.
Iikhamera ze-ClearView® ezisebenza kakuhle ziphucula ukusebenza kwe-routine transmission electron microscopy (TEM).
I-XRF Scientific Orbis Laboratory Jaw Crusher yi-dual-action fine crusher enobuchule bokuqhekeza imihlathi enokunciphisa ubungakanani besampulu ukuya kuthi ga kumaxesha angama-55 ubukhulu bayo bokuqala.
Funda nge-picoindenter kaBruer iHysitron PI 89 SEM, i-picoindenter yanamhlanje yohlalutyo lwe-nanomechanical oluyi-in situ.
Imarike ye-semiconductor yehlabathi ingene kwixesha elinomdla. Imfuno yetekhnoloji yeetshiphusi iqhube kwaye iphazamise eli shishini, kwaye ukunqongophala kweetshiphusi ngoku kulindeleke ukuba kuqhubeke okwethutyana. Iindlela ezikhoyo zinokutshintsha ikamva leli shishini, kwaye le ndlela iya kuqhubeka isasazeka.
Umahluko ophambili phakathi kweebhetri zegraphene kunye neebhetri ze-solid-state kukwakheka kwe-electrode nganye. Nangona i-cathode idla ngokuguqulwa, ii-allotropes zekhabhoni nazo zingasetyenziselwa ukwenza ii-anode.
Kwiminyaka yakutshanje, i-Intanethi yezinto iye yaziswa ngokukhawuleza phantse kuzo zonke iimboni, kodwa ibaluleke kakhulu kwishishini lezithuthi zombane.