Photocatalysts

Vim Li Cas Xaiv Peb

Kev paub nplua nuj
Nrog ntau xyoo dhau los ntawm kev tshawb fawb, kev tsim khoom thiab kev lag luam organic chemicals, peb tau dhau los ua tus xa khoom thoob ntiaj teb ntawm kev tshawb fawb tshuaj, kev tsim kho thiab kev tsim khoom.

Pab neeg tshaj lij
Genie Chemical muaj ib pab neeg R&D uas txawj ntse ntau tshaj 200 tus neeg.

Kev pabcuam ib-nres
Kev tshuaj xyuas zoo, kev tswj hwm ntau lawm thiab kev pabcuam tomqab muag, muab kev pabcuam ib-nres.

QC
Nws tau txais daim ntawv pov thawj ISO 9001 thiab tau teeb tsa lub chaw kuaj mob siab rau siv cov qauv kev tswj hwm nruj ntawm txhua theem ntawm cov txheej txheem tsim khoom. Cov neeg soj ntsuam zoo saib xyuas cov txheej txheem tsim khoom ntawm txhua yam khoom kom ntseeg tau tias cov khoom siv tshuaj lom neeg kawg.

Photocatalysts yog dab tsi

Photocatalysts yog cov khoom siv, tshwj xeeb tshaj yog cov khoom siv hluav taws xob zoo li titanium dioxide thiab zinc oxide, uas ua rau cov tshuaj lom neeg muaj zog hauv lub teeb irradiations. Thaum photons ntawm lub zog txaus tawm tsam qhov chaw photocatalyst, cov khub electron-qhov yog tsim. Qhov no pib redox cov tshuaj tiv thaiv uas degrade organic pollutants thiab tua cov kab mob hauv dej. Ntau yam thiab muaj txiaj ntsig photocatalysts siv lub hnub ci lossis teeb pom kev zoo los tsav cov kev cuam tshuam no, yog li muab cov kev daws teeb meem txuas ntxiv mus thiab eco-phooj ywg.

Cov txiaj ntsig ntawm Photocatalysts

Deodorant nyhuv

Photocatalysts muaj ib feem hu ua titanium dioxide. Thaum no titanium dioxide raug rau ultraviolet lub teeb los yog lub teeb fluorescent, reactive oxygen hom yog tsim. Nws nqus cov ntxhiab tsw uas ua rau nws nkag mus rau hauv kev sib cuag nrog thiab tawg rau hauv dej thiab carbon dioxide. Nws muaj qhov zoo ntawm kev tshem tawm tag nrho cov ntxhiab tsw hauv chav, xws li luam yeeb, pwm, thiab khau khau.

Decomposition thiab tshem tawm cov teeb meem tshuaj: formaldehyde tshem tawm, tshem tawm tsw

Photocatalyst kuj muaj cov haujlwm ntawm decomposing thiab tshem tawm "formaldehyde". Cov khoom tsis zoo no yog volatilized los ntawm cov khoom siv hauv tsev thiab rooj tog thiab yog qhov ua rau muaj kab mob ua xua hauv chav. Tsis tas li ntawd, tsis zoo li cov txheej txheem ntawm kev tshem tawm cov tshuaj lom neeg los yog cov tshuaj lom neeg, lub teeb pom kev zoo photocatalyst feem ntau yog tsim los ntawm cov khoom hu ua nano-titanium dioxide apatite, uas tuaj yeem siv los ua zaub mov ntxiv, uas muaj kev nyab xeeb thiab tsis muaj. kev mob tshwm sim.

Antibacterial nyhuv

Photocatalyst muaj cov nyhuv deodorizing. Nws muaj cov nyhuv decomposing thiab tshem tawm Norovirus, mob khaub thuas, Escherichia coli, Salmonella, thiab fungi. Pwm, tshwj xeeb tshaj yog, dissipate spores thaum lawv sib npaug, thiab txheej txheej phab ntsa lossis qab nthab nrog photocatalysts zoo heev tiv thaiv cov spores.

Anti-algae thiab Anti-mildew Effect

Photocatalysts uas muaj nyiaj ions muaj cov tshuaj tua kab mob, yog li txawm tias me me ntawm lub teeb tuaj yeem ua rau muaj cov kab mob tua kab mob. Tsis tas li ntawd, photocatalytic titanium oxide muaj cov nyhuv ntawm decomposing teeb meem tshuaj uas tsim los ntawm cov kab mob, uas tsis tuaj yeem decomposed los ntawm tsoos tshuaj tua kab mob thaum lawv tuag. Piv txwv li, nws tiv thaiv cov kab mob xws li O-157, E. coli, thiab pwm, thiab vim nws cov nyhuv antifungal, nws tiv thaiv cov ntxhiab tsw phem.

Antifouling nyhuv

Lub photocatalyst muaj lub luag haujlwm ntawm decomposing thiab tshem tawm cov tshuaj xws li ammonia nyob rau hauv kev sib cuag nrog cov phab ntsa npog. Yog li ntawd, nws muaj cov nyhuv inhibiting yellowing tshwm sim los ntawm luam yeeb thiab lwm yam.

Hom ntawm Photocatalysts

Homogeneous Photocatalysis

Lub homogeneous photocatalysis, koom nrog lub hav zoov ntawm reactants thiab photocatalysts nyob rau tib theem, piv txwv li, ob qho tib si tuaj yeem ua rau hauv cov pa roj. Ib qho piv txwv ntawm homogeneous photocatalysts siv yog ozone thiab photo-Fenton systems (Fe + thiab Fe + / H2O2). Ntawm no cov hom reactive yog los ua hydroxyl radical (•OH) uas nyiam siv rau ntau lub hom phiaj thiab lub hom phiaj. Qhov txheej txheem ntawm kev tsim hydroxyl radical (•OH) los ntawm ozone tuaj yeem ua raws li ob txoj hauv qab no.

Heterogeneous Photocatalysis

Nws yog pom tseeb los ntawm lub ntsiab txhais tias "Heterogeneous catalysis" cuam tshuam cov catalysts thiab reactants nyob rau hauv ib theem sib txawv. Heterogeneous photocatalysis yog ib qho teeb meem uas cuam tshuam nrog ntau yam kev tshwm sim, uas suav nrog tab sis tsis txwv rau; me me los yog tag nrho cov tshuaj tiv thaiv oxidation, dehydrogenation txheej txheem, hydrogen hloov cov tshuaj tiv thaiv, 18O2-16O2 thiab deuterium-alkane isotopic pauv cov tshuaj tiv thaiv, hlau deposition, dej detoxification, gaseous pollutant tshem tawm cov txheej txheem, thiab lwm yam. Feem ntau thiab feem ntau siv heterogeneous photocatalysts xws li kev hloov hlau oxides thiab semiconductors. , uas undergo cov yam ntxwv tshwj xeeb.

Kev siv cov Photocatalysts

Kev kho dej

Hauv kev kho dej khib nyiab ntau yam binary thiab ternary semiconductors tau siv los ua photocatalysts. Cov titanium dioxide (TiO2) thiab zinc oxide (ZnO) photocatalysts feem ntau tau siv rau hauv kev ua kom huv ntawm cov dej khib nyiab. Zinc oxide photocataly yog cov tshuaj oxidation zoo heev uas yog siv ntau hauv kev kho cov dej khib nyiab hauv kev lag luam xws li hauv chaw muag tshuaj, luam ntawv xovxwm thiab dyeing, ntawv thiab pulp kev lag luam, thiab lwm yam. Qhov zoo tshaj plaws photocatalysts rau photocatalytic decontaminating dej. Benjwal et al. (2015) cov kev tshawb fawb nthuav tawm tias graphene oxide-TiO2/Fe3O4- raws li ternary nanocomposites yog cov kev siv yav tom ntej hauv kev kho cov dej khib nyiab.

Tshem Tawm Cov Kab Hlau

Qee cov kab mob xws li mercury (Hg), chromium (Cr), thiab lead (Pb), nrog rau lwm yam hlau, muaj kev phom sij heev rau tib neeg kev noj qab haus huv. Los ntawm kev siv cov heterogeneous photocatalysis rau lub hom phiaj ntawm kev tswj cov dej zoo li tib neeg kev noj qab haus huv, xws li toxicity ntawm hlau tuaj yeem raug tshem tawm, txawm tias nyob rau theem qis ntawm cov concentrations xws li qhov chaw ib lab (ppm).

Kev sib cais dej

Rau cov tshuaj tiv thaiv ntawm cov dej sib cais ntau hom xws li sulfides, oxides thiab selenides tau tsim ua cov photocatalysts. Titanium dioxide (TiO₂) nanoparticles, ob peb semiconductors (coupled) zoo li CaFe204/TiO₂, heterojunction WO3/BiVO4, as well as core or shell nanofibers like CdS/Zno, and many more, muab txoj hauv kev zoo heev rau hydrogen ntau lawm los ntawm dej.

Kev Ntxuav Tus Kheej Ua Haujlwm

Titanium dioxide (TiO₂) photocatalyst tau txais ntau qhov kev lees paub tias yog cov khoom siv photofunctional, yog vim li cas yog vim li cas cov iav thiab cov nplais yuav tsum tau siv tshuaj detergents, depletion nrog lub zog siab, thiab nws tseem kim heev. Kev ntxuav tus kheej raws li titanium dioxide ua rau cov inorganic nrog rau cov organic molecules kom nyob twj ywm absorbed thiab degraded rau nws effortlessly. Tom qab ntawd, nws yooj yim los ntxuav nrog dej vim tias muaj dej hydrophilicity ntawm TiO₂ zaj duab xis. Cov txiaj ntsig tau hais los ntawm TiO₂ yuav ua haujlwm rau tus mob no; Thaum tus nqi ntawm absorbed organic pollutants nyob rau saum npoo ntawm cov khoom yog tsawg dua li ntawm qhov teeb meem hnub ci photons ib chav tsev lub sij hawm. Cov txheej txheem, cov xim pleev xim rau cov phab ntsa ntawm cov tuam tsev thiab cov txheej txheem kev tsim kho tau raug cuam tshuam rau huab cua phem xws li dej nag thiab hnub ci hnyav, yog li

Yam Uas Txhim Kho Photocatalyst Performance

Composites / Coupling

Lwm cov txheej txheem siv tau los ua kom cov photocatalysts ua haujlwm tau zoo hauv cov teeb pom kev zoo rau ntau yam kev siv yog coupling ntawm semiconductors lossis composite. Xws li qhov sib txawv loj ntawm qhov sib txawv me me ntawm cov khoom siv hluav taws xob sib txuas ua ke yog li, lawv muaj qhov tsis zoo ntawm kev coj ua band (CB) ntau dua. Yog li, qhov tshwm sim yuav yog; cov electrons ntawm Conduction band (CB) tuaj yeem raug txhaj los ntawm qhov me me band gap semiconductor mus rau qhov loj band gap semiconductor. Cov txheej txheem no thiab cov txheej txheem dye rhiab heev zoo ib yam, txawm li cas los xij qhov sib txawv tsuas yog tias cov electrons yuav txav los ntawm ib qho semiconductor mus rau lwm qhov. Kev tsim cov Hydrogen los ntawm kev sib txuas SnO2, CdS, CdS / Pt-TiO2, thiab NiS / ZnxCd1-xS / txo graphene oxide tau raug tshuaj xyuas.

Metallization

Txhawm rau txhim kho cov kev ua haujlwm photocatalytic ntawm ib lub semiconductor ntau yam hlau zoo li Pt, Au, Ag, Ni, Cu, Rh, Pd, thiab lwm yam, tau siv. Qhov tshwm sim ntawm electron-qhov recombination / rejoining yog txo los ntawm cov txheej txheem no, thiab qhov no ua rau muaj txiaj ntsig zoo sib cais nrog rau cov nqi siab dua ntawm cov tshuaj tiv thaiv photocatalytic. Vim tias cov khoom ntawm noble hlau electron hloov pauv tuaj yeem pab tau, uas ua rau muaj kev ua haujlwm photocatalytic ntau dua.

Dye Sensitization

Dye sensitization yog ib qho txheej txheem zoo rau kev txhim kho saum npoo thiab kev hloov kho ntawm photocatalysts rau kev siv lub teeb pom kev zoo rau lub zog hloov dua siab tshiab. Dyes muaj oxidation-txo cov yam ntxwv nrog rau pom lub teeb rhiab heev uas yuav pab tau rau lub hnub ci hlwb thiab hauv photocatalytic systems. Cov tshuaj tiv thaiv catalytic tuaj yeem pib vim tias thaum cov dyes raug coj mus rau hauv qhov pom ntawm lub teeb pom kev lawv txhaj cov electrons mus rau Conduction band (CB) ntawm semiconductors. Kev txhaj tshuaj electron ceev thiab nrawm thiab qeeb rov qab cov tshuaj tiv thaiv yog cov xwm txheej tseem ceeb txhawm rau hloov lub teeb pom kev ncaj qha mus rau hauv hluav taws xob lub zog nrog kev ua haujlwm siab dua hauv lub hnub ci hlwb lossis los ntawm kev tsim cov hydrogen.

Doping

Daim ntawv thov ntawm doping yog lub npe hu ua ntxiv ntawm impurities rau ib tug ntshiab tshuaj. Doping muab faib ua ob pawg sub uas yog; (1) Cationic doping thiab (2) Anionic doping.Cationic doping suav nrog cov doping ntawm cations rau cov semiconductors, xws li cov hlau xws li Al, Cu, V, Cr, Fe, Ni, Co, Mn, thiab lwm yam. anionic doping suav nrog kev siv cov anions, xws li nonmetals xws li N, S, F, C, thiab lwm yam. Cov siv lead ua lattice ntawm photocatalyst tau txais ib qho kev cuam tshuam tshiab thiab tshwj xeeb los ntawm txhua qhov sib txawv dopant. Cov doping ntawm cov hlau thiab cov nonmetal ion ua rau cov duab teb ua rau lub ntsej muag ntawm lub photocatalyst kom nws mus rau thaj tsam pom los ntawm kev tsim cov qib zog tshiab (los yog lub xeev impurity) ntawm Valence band (VB) thiab Conduction band (CB) kom txo nws qhov sib txawv band. Cov electrons uas zoo siab los ntawm lub teeb yog hloov los ntawm impurity xeev mus rau Conduction band (CB).

Yuav Ua Li Cas Tiv Thaiv Photocatalysts Deactivation?

Tshuaj lom

Qhov laj thawj tseem ceeb ntawm Photocatalysts deactivation yog lom. Nws yog hais txog kev thim rov qab los yog tsis muaj tshuaj lom neeg tsis ua haujlwm ntawm Photocatalysts thiab ua rau poob ntawm catalytic kev ua haujlwm, kev ruaj ntseg, thiab kev xaiv, uas ua rau muaj teeb meem loj thiab kev lag luam poob hauv cov txheej txheem catalytic. Daim duab 1. qhia tau hais tias leej faj lom los ntawm H2S ntawm nickel Photocatalysts nrog & tsis muaj oxygen ntxiv.

Sintering

Sintering yog lwm qhov ua rau Photocatalysts deactivation. Nws yog ib qho thermal degeneration uas los nrog txo qhov chaw catalytic thiab thaj chaw txhawb nqa. Dab tsi yog qhov phem dua, cov theem catalytic yuav hloov mus rau cov theem uas tsis yog-catalytic, yog li cuam tshuam cov kev xav tshuaj.

Coking

Coking suav txog li 20% ntawm Photocatalysts deactivation, thiab nws feem ntau cuam tshuam nrog kev ntsaws. Namely, cov carbonaceous thiab lwm yam ntaub ntawv nyob rau hauv lub Photocatalysts pores deposit, txo lub pore loj thiab tiv thaiv cov reactant molecules ntawm diffusing mus rau hauv lub pore. Feem ntau, cov carbonaceous deposits yuav raug tshem tawm los ntawm gasification nrog dej vapor los yog hydrogen, thiab peb tau txais CH4, CO. , thiab COx, feem. Yog li, coking deactivation yog txheej txheem thim rov qab. Daim duab 2. yog schematic illustration ntawm coke deposition ntawm unmodified thiab hlau-hloov HZSM-5 Photocatalysts.

Photocatalysis Mechanism

(1) Cov txheej txheem pib nrog kev nqus ntawm lub teeb thiab cov tiam tom ntej ntawm cov khoom thauj. Thaum lub ntsej muag ntawm lub photocatalyst yog illuminated los ntawm lub teeb nrog lub zog sib npaug los yog tshaj qhov sib txawv ntawm lub zog ntawm Hlau Halide Perovskites (MHPs), ib qho kev hloov hluav taws xob tam sim ntawd tshwm sim, ua rau muaj kev tsim ntawm electron-qhov (eh) khub. Nws yog tsim nyog sau cia tias lub teeb feem ntau yog faib ua ob lub wavelength ranges: ultraviolet (UV) lub teeb, ncua 200-400 nm, thiab pom lub teeb, npog qhov 400-800 nm ntau. Qhov tseem ceeb, thaum lub zog sib txawv (piv txwv li) ntawm ib qho khoom siv hluav taws xob qis dua li ntawm 3.1 electronvolts (eV), cov khoom tuaj yeem nqus pom lub teeb pom kev zoo. Qhov peev xwm no tseem ceeb heev vim tias pom photons ua ib feem tseem ceeb ntawm lub hnub ci, ua rau kwv yees li 50% ntawm nws cov muaj pes tsawg leeg.

(2) Cov theem tseem ceeb tom ntej no suav nrog kev sib cais thiab txav ntawm cov neeg nqa khoom them nqi. Raws li lub teeb ua rau txoj kev hloov ntawm electrons los ntawm valence band (VB) mus rau qhov conduction band (CB), nws tawm hauv qab qhov hauv VB. Qhov no electron-qhov (eh) kev sib cais yog ib kauj ruam tseem ceeb hauv photocatalysis. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum lees paub tias qhov rov ua dua ntawm cov khoom siv hluav taws xob photogenerated thiab qhov yog ib qho txheej txheem tsim nyog thiab tsis muaj kev zam. Hmoov tsis zoo, qhov kev sib xyaw ua ke no tuaj yeem cuam tshuam qhov kev siv tau zoo ntawm cov neeg nqa khoom, thaum kawg txo qis kev ua haujlwm catalytic ntawm photocatalysts.

(3) Cov kauj ruam tom ntej yuav muaj qhov cuam tshuam redox ntawm cov khoom siv sib txuas. Qhov no suav nrog kev hloov pauv sai ntawm cov hluav taws xob, muaj peev xwm txo qis, thiab qhov, muaj peev xwm oxidation, mus rau cov chaw tsim tshuaj tiv thaiv rau saum npoo ntawm Hlau Halide Perovskite (MHP) photocatalysts. Thermodynamically hais lus, ua kom tiav cov tshuaj tiv thaiv redox zoo yuav tsum muaj kev sib haum xeeb ntawm lub zog ntawm cov qauv ntawm cov semiconductor thiab cov tshuaj tiv thaiv redox. Qhov kev sib raug zoo no tau txiav txim siab tias lub zog ntawm cov kab hluav taws xob conduction (CB) yuav tsis zoo dua li qhov txo qis, thaum lub zog theem ntawm valence band (VB) yuav tsum muaj qhov zoo dua li qhov muaj peev xwm oxidation.

Yuav Ua Li Cas Kho Photocatalysts

01/

Xaiv Txoj Cai Photocatalysts
Xaiv qhov zoo Photocatalysts rau daim ntawv thov tshwj xeeb yog qhov tseem ceeb hauv kev tiv thaiv kev ua haujlwm tsis zoo. Cov Photocatalysts sib txawv muaj qhov sib txawv ntawm kev ruaj ntseg thiab tsis kam mus rau deactivation. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau xaiv ib qho Photocatalysts uas haum rau cov txheej txheem tshwj xeeb. Lub Photocatalysts tsim kuj tseem ceeb. Koj tuaj yeem hloov qhov chaw, qhov pore loj, thiab pellet loj los tiv thaiv Photocatalysts lom.

02/

Khaws cov Photocatalysts huv si
Ib qho ntawm cov laj thawj tseem ceeb rau Photocatalysts deactivation yog qhov tsub zuj zuj ntawm cov kab mob ntawm nws qhov chaw. Cov impurities tuaj yeem los ntawm cov khoom noj los yog los ntawm ib puag ncig ib puag ncig. Txhawm rau tiv thaiv qhov no los ntawm qhov tshwm sim, nws yog ib qho tseem ceeb uas yuav tsum tau ua kom huv si ib ntus lossis lim cov khoom noj.

03/

Tsis txhob kub siab
Photocatalysts tuaj yeem nkag siab rau qhov kub thiab txias, uas tuaj yeem ua rau lawv tsis ua haujlwm. Nws yog ib qho tseem ceeb kom tsis txhob nthuav tawm cov Photocatalysts rau qhov kub thiab txias tshaj nws qhov kev ua haujlwm nyab xeeb. Koj yuav zoo dua saib xyuas qhov kub ntawm qhov system thiab kho cov txheej txheem kom haum.

04/

Saib xyuas Photocatalysts Kev Ua Haujlwm
Kev saib xyuas cov haujlwm ntawm Photocatalysts tuaj yeem pab txheeb xyuas cov kev hloov pauv hauv nws qhov kev ua tau zoo. Qhov no tuaj yeem ua tiav los ntawm kev ntsuas cov tshuaj tiv thaiv tsis tu ncua lossis los ntawm kev kuaj Photocatalysts raws sijhawm. Los ntawm kev saib xyuas cov haujlwm ntawm Photocatalysts, txhua yam teeb meem tuaj yeem txheeb xyuas tau ntxov, thiab kev kho yuav raug coj los tiv thaiv kom tsis txhob ua haujlwm.

Peb lub Hoobkas

Nrog ntau xyoo dhau los ntawm kev tsim khoom thiab kev lag luam cov tshuaj zoo, Gnee Chemical Company, peb muab cov tshuaj Organic, Biochemicals, Pharmaceutical Intermediates, thiab ntau dua.Gnee Chemical muaj cov neeg ua haujlwm txawj hauv kev tshawb fawb thiab kev tsim kho. Peb pab neeg ntawm ntau tshaj 200 tus neeg yog lub luag haujlwm rau kev kuaj xyuas zoo, kev tswj hwm kev tsim khoom thiab kev pabcuam tomqab muag raws li kev pabcuam ib-nres. Peb muab R & D thiab cov kev daws teeb meem rau peb cov neeg siv khoom thoob ntiaj teb.Peb ua raws li lub hauv paus ntsiab lus ntawm "Quality First" thiab tau txais ISO 9001 ntawv pov thawj. Peb kuj tau teeb tsa lub chaw kuaj mob siab rau siv cov qauv kev tswj xyuas nruj ntawm txhua theem ntawm cov txheej txheem tsim khoom. Cov neeg soj ntsuam zoo saib xyuas cov txheej txheem tsim khoom ntawm txhua yam khoom kom ntseeg tau tias cov khoom siv tshuaj lom neeg kawg.

productcate-1-1

Cov ntawv pov thawj

FAQ

Q: Cov kev txwv ntawm photocatalytic system yog dab tsi?

A: Txawm li cas los xij, ntau ntawm cov semiconductor photocatalysts tsis tuaj yeem nqus cov teeb pom kev ntawm lub hnub ci spectra vim lawv qhov sib txawv ntawm qhov dav. Kev koom ua ke ntawm cov khoom txawv teb chaws xws li dopant nyob rau hauv lub lattice ntawm cov photocatalysts tau pom tias yuav txo tau lawv qhov sib txawv band thiab txhim kho pom lub teeb pom kev.

Q: Dab tsi yog qhov kev sib tw ntawm photocatalysis?

A: Ntau yam, suav nrog kev them nqi-cov cab kuj rov ua dua, kev cuam tshuam cov nqi hloov pauv, kev ua kom tsis zoo, thiab kev sib cais, txo cov txiaj ntsig ntawm cov txheej txheem photocatalysis thaum raug pom spectrum [138] . Ib qho ntawm cov teeb meem tseem ceeb uas tau hais txog yog qhov tsis tshua muaj hydrogen cia [83].

Q: Puas yog photocatalysts rov siv tau?

A: Cov yeeb yaj kiab photocatalytic MoS2 tau yooj yim rov qab tau thiab rov siv tau. Cov yeeb yaj kiab nthuav tawm cov txheej txheem siab thiab tshuaj lom neeg ruaj khov txawm tias tom qab 5- voj voog ntawm cov kev tshawb fawb degradation.

Q: Dab tsi ua rau photocatalyst zoo?

A: Lub photocatalyst zoo yuav tsum yog tus cwj pwm los ntawm: (i) lub peev xwm nqus hluav taws xob los ntawm ntau lub teeb pom kev zoo, (ii) qhov tsim nyog txoj hauj lwm ntawm lub zog bands ntawm lub semiconductor txog redox cov tshuaj tiv thaiv muaj peev xwm, (iii) siab zog thiab ntev diffusion txoj kev ntawm tus nqi thauj khoom, (iv) thermodynamic.

Q: Dab tsi yog qhov cuam tshuam rau photocatalyst?

A: Qhov loj ntawm dye adsorption nyob ntawm qhov pib dye concentration, xwm ntawm dye, thaj tsam ntawm photocatalyst thiab pH ntawm cov tshuaj. Lub pH txiav txim siab qhov nqi ntawm lub photocatalyst. Adsorption ntawm cov dye yog qhov tsawg kawg nkaus thaum pH ntawm cov tshuaj nyob rau ntawm isoelectric point (point of xoom charge.

Q: Vim li cas photocatalysts tseem ceeb?

A: Photocatalysts yog cov ntaub ntawv zoo heev uas tuaj yeem hloov kho lub hnub ci zog yooj yim rau kev siv hauv oxidation thiab txo cov dej num. Photocatalysts yog siv nyob rau hauv ntau qhov chaw, xws li tshem tawm cov pa phem los ntawm huab cua thiab dej, dej sib cais los tsim H2, tswj tsw tsw, mob qog noj ntshav, thiab cov kab mob inactivation.

Q: Vim li cas cov conductors tsis siv los ua photocatalyst?

A: Nyob rau hauv rooj plaub ntawm tus neeg xyuas pib, valence band thiab conduction band yog sib tshooj. Rau cov tshuaj tiv thaiv photocatalytic tsim nyog yog oxidation thiab txo ib txhij, tab sis nyob rau hauv conduction xwb dawb electron muaj. Daim ntawv tus neeg xyuas pib, peb tsuas yog ua cov tshuaj tiv thaiv oxidization ntawm ib lub sij hawm tsis yog ob qho tib si tshuaj tiv thaiv ib txhij.

Q: lub kaus mom yog cov photocatalysts tshaj plaws?

A: Titanium (IV) oxide
Txawm hais tias muaj txiaj ntsig zoo ntawm zinc oxide, titanium (IV) oxide tseem yog cov khoom siv photocatalyst tshaj plaws. Qhov no feem ntau cuam tshuam nrog cov tshuaj lom neeg ruaj khov dua ntawm TiO2. Titanium (IV) oxide muaj qhov sib txawv ntawm lub zog zoo sib xws rau ZnO (3.2 eV) thiab lub zog zoo sib xws.

Q: Dab tsi yog qhov nquag photocatalyst?

A: Titanium dioxide (TiO2) yog qhov tseem ceeb tshaj plaws photocatalyst [1,2,3], dav ua haujlwm vim nws cov haujlwm photocatalytic zoo, tshuaj lom neeg thiab lom neeg ruaj khov, insolubility hauv dej, acid thiab puag ncig, tiv taus corrosion, nontoxicity, qis. tus nqi, thiab muaj nyob rau hauv kev sib piv rau oxide, sulfide.

Q: Dab tsi yog qhov yuav tsum tau ua rau photocatalyst?

A: Cov kev xav tau ntawm photocatalyst suav nrog tsawg kawg ib qho khoom siv semiconductor-A nrog qhov sib txawv ntawm qhov tsawg kawg nkaus 3 eV, tsawg kawg ib qho khoom siv semiconductor-B nrog qhov sib txawv ntawm qhov tsawg dua lossis sib npaug ntawm 3 eV, thiab tsawg kawg ib qho ntxiv -C.As cov ntsiab lus ntawm photocatalyst fibers nce, cov ntaub yuav nqus tau ntau ammonia, deodorant kev ua tau zoo dua thiab cov nyhuv deodorant kuj zoo dua. Thaum cov ntsiab lus ntawm photocatalyst fiber ntau yog 80% thiab 100%, cov ntaub muaj cov nyhuv deodorizing zoo.

Q: Dab tsi yog cov teeb meem nrog photocatalysis?

A: Cov kev sib tw ntawm cov khoom siv suav nrog kev sib xyaw thiab tsim cov photocatalysts uas tuaj yeem nqus cov teeb pom kev ntawm lub siab quantum efficiency, cocatalysts uas muaj kev xaiv thiab tuaj yeem ua kom txo qis thiab / lossis oxidation cov tshuaj tiv thaiv, thiab cov txheej tiv thaiv uas pab txhawb kev tsiv teb tsaws ntawm cov neeg nqa khoom tsawg. mus rau.

Q: Lub hauv paus ntawm photocatalyst yog dab tsi?

A: Hauv photocatalysis, hluav taws xob yog siv rau kev nrawm ntawm cov tshuaj tiv thaiv. Cov hluav taws xob dav dav tau muab faib ua ob thaj tsam: ultraviolet thiab pom, uas tau pom zoo xaiv raws li cov catalyst Piv txwv. Tsuas yog 4% ntawm lub hnub ci spectrum tuaj nyob rau hauv cheeb tsam UV.

Q: Qhov txawv ntawm photocatalysis thiab photocatalyst yog dab tsi?

A: Photocatalysis suav nrog cov tshuaj tiv thaiv uas tshwm sim los ntawm kev siv lub teeb thiab semiconductor. Lub substrate uas absorbs lub teeb thiab ua raws li ib tug catalyst rau tshuaj tiv thaiv yog hu ua ib tug photocatalyst.

Q: Dab tsi yog photocatalyst degradation?

A: Photocatalytic degradation yog cov txheej txheem oxidation siab heev, uas tuaj yeem siv los degrade cov pa phem nrog siab concentration, complexity thiab tsawg biodegradability [204]. Photocatalytic degradation siv lub teeb lub zog los tsav cov pa phem degradation.

Q: Vim li cas UV teeb siv hauv photocatalysis?

A: UV-lub teeb ncaj qha excitation tau ntev tau muab txoj hauv kev tshwj xeeb rau kev nkag mus rau cov molecules hauv lawv lub xeev zoo siab thiab txhawb kev tsis sib haum xeeb. Nrog rau qhov tshwm sim ntawm photocatalysis, cov xeev zoo siab tuaj yeem ncav cuag siv cov hluav taws xob tsis tshua muaj zog los ntawm kev ua ntawm photosensitizer.

Q: Cov hlau twg siv hauv photocatalysis?

A: Ntawm no, peb tshaj tawm cov txheej txheem photocatalytic uas ua rau ib tus tuaj yeem xaiv tau xya lub txiaj ntsig zoo - nyiaj (Ag), kub (Au), palladium (Pd), platinum (Pt), rhodium (Rh), ruthenium (Ru) thiab iridium (Ir) - los ntawm cov pov tseg Circuit Court boards, ternary automotive catalysts thiab ores.

Q: Dab tsi yog nanomaterials rau photocatalysis?

A: Hlau nanoparticles xws li platinum, nyiaj, thiab kub, los yog lawv ua ke, yog cov ntaub ntawv zoo heev piv rau ob peb hlau oxides. Cov ntaub ntawv no muaj cov khoom siv hluav taws xob zoo thiab photocatalytic.

Q: Dab tsi yog qhov txwv ntawm photocatalysis?

A: Ib qho kev txwv yog qhov nqaim ntawm lub teeb teb thiab tsis muaj peev xwm sib cais ntawm cov khoom siv semiconductor tam sim no. Lwm qhov kev txwv yog qhov kev sib tw ntawm kev nce qib photocatalysis rau cov txheej txheem kev lag luam uas yog tus nqi sib tw nrog cov thev naus laus zis uas twb muaj lawm.

Q: Dab tsi yog qhov tsis zoo cuam tshuam rau photocatalysis?

A: Hauv photocatalytic degradation ntawm cov dyes hauv cov dej khib nyiab, cov hauv qab no yog cov kev ua haujlwm uas cuam tshuam rau cov txheej txheem: pH ntawm cov tshuaj kom degraded, thiab pH ntawm cov tshuaj precursor (catalyst's tov thaum npaj cov catalyst); oxidizing tus neeg saib xyuas, calcination kub, dopant cov ntsiab lus, thiab catalyst ...

Q: Puas yog photocatalysis tsim ozone?

A: Yog, nyob ntawm UV wavelength. Lub teeb UV nyob ntawm 160-240 nanometers yog qhov zoo tagnrho rau kev tsim ozone los ntawm oxygen. Nco ntsoov tias oxygen molecules tsim ozone los ntawm cov txheej txheem hu ua photolysis. Cov txheej txheem feem ntau cuam tshuam cov pa oxygen molecule thiab ua rau muaj cov pa oxygen atoms.

Raws li ib qho ntawm cov ua photocatalysts manufacturers thiab lwm tus neeg nyob hauv Suav teb, peb sov siab txais tos koj rau cov lag luam wholesale pheej yig photocatalysts muag ntawm no los ntawm peb lub hoobkas. Tag nrho cov khoom siv tshuaj muaj txiaj ntsig zoo thiab cov nqi sib tw.