Tus kab khiavyog ib qho tseem ceeb ntawm cov ntaub ntawv tsis tshua muaj cov ntaub ntawv. TusTsis tshua muaj ntiaj teb caij xiIABmuaj ib qho qauv tshwj xeeb txheej txheem hluav taws xob - 4F15D16S2. Nws cov txheej txheem 4F tshwj xeeb yuav tau txais cov khoom siv thiab tso cov hluav taws xob, ua cerium ions coj tus coj hauv lub xeev thiab + 4 lub xeev valence. Yog li no, cov ntaub ntawv CEO2 muaj cov oxygen ntau dua, thiab muaj peev xwm muaj peev xwm khaws thiab tso cov oxygen. Kev sib hloov hloov dua siab ntawm CE (III) thiab CE (IV) kuj tau xaus cov ntaub ntawv ua ke2 nrog cov cim kev phom sij-txo cov catalytic-txo catalytic muaj peev xwm. Piv rau cov ntaub ntawv loj, Nano Ceo2, raws li cov khoom siv inorganic, tau txais kev ua haujlwm ntawm cov pa hluav taws xob, oxygen thiab cov oxygen olieces, thiab siab kub sai oxygen muaj peev xwm txawv. Tam sim no muaj ntau cov ntaub ntawv tshawb fawb thiab cov ntaub ntawv ntsig txog siv Nano CEO2 ua catalysts, cov khoom lag luam catalyst lossis cov khoom sib ntxiv, thiab cov exsorbents.
1. Kev npaj txoj kev ntawm nanometercerium oxide
Txog tam sim no, cov kev xaiv ntawm NANA ceria tsuas yog suav nrog kev siv tshuaj thiab kev siv lub cev. Raws li cov qauv tshuaj sib txawv, cov qauv siv tshuaj tuaj yeem faib ua txoj kev los nag, solvothermal txoj kev, microomulsion txoj kev, microtrepuls txoj kev; Lub cev lub cev yog feem ntau cov kev sib tsoo.
1.1 Txoj Kev Sib Tsoo
Txoj kev sib tsoo rau npaj nano ceria feem ntau siv cov xuab zeb sib tsoo, uas muaj kev ua phooj ywg qis, thiab muaj peev xwm ua tau nrawm. Tam sim no nws yog qhov kev ua tseem ceeb tshaj plaws hauv NANAs ceria kev lag luam. Piv txwv li, kev npaj ntawm nano cine cerium oxide cov hmoov uas muaj kev sib xyaw ua ke ntawm kev kho cov catalmints thiab xuab zeb sib xyaw ua ntej lossis kho tom qab kev xam pom siv xuab zeb sib tsoo. Los ntawm kev siv sib txawv particle sild sib tsoo hlaws sib tsoo, nano ceria nrog d50 xws li tens mus rau ntau pua leej nanometers tuaj yeem tau los ntawm kev hloov kho.
1.2 precipitation txoj kev
Txoj kev thoob plaws nag lossis daus yog hais txog tus txheej txheem ntawm kev npaj cov hmoov nplej los ntawm nag lossis daus, thiab kev txiav cov ntaub ntawv raw, thiab kho cov ntaub ntawv raw hauv cov kuab tshuaj uas tsim nyog. Txoj kev ua nag lossis daus tau siv nyob rau hauv kev npaj ntawm lub ntiaj teb tsawg dua li kev npaj yooj yim, muaj txiaj ntsig zoo, thiab tus nqi qis. Nws yog ib txoj kev siv ntau rau kev npaj nano ceria thiab nws cov ntaub ntawv sib xyaw hauv kev lag luam. Txoj kev no tuaj yeem npaj NANAs Ceria nrog cov kev sib txawv thiab cov khoom siv ceev, thiab cov khoom siv nag lossis daus, thiab nag lossis daus. Lwm txoj kev, cerium ions tuaj yeem ua ntej los ntawm huag - tsim tawm los ntawm cov hydrolysis ntawm cov sodium citrate, thiab tom qab ntawd muab kom pov tseg xws li nano ceria microspheres.
1.3 hydrothermal thiab cov txheej txheem huab cua sov
Ob txoj hau kev no hais txog txoj kev npaj khoom los ntawm kev kub siab thiab cov tshuaj tiv thaiv kev kub siab ntawm qhov ntsuas kub tseem ceeb hauv lub kaw lus kaw. Thaum cov kuab tshuaj yeeb yam yog dej, nws yog hu ua hydrothermal txoj kev. Sib raug zoo, thaum cov kuab tshuaj tiv thaiv kab mob yog ib hom kuab tshuaj organic, nws hu ua kev sib txuam. Cov ntse nano hais muaj siab heev, zoo dispersion thiab sau cov khoom siv, tshwj xeeb tshaj yog cov hmoov morphologies sib txawv lossis cov ntsej muag tshwj xeeb crystal ntsej muag. Dissolve cerium cerium chloride nyob rau hauv dej distilled, do thiab ntxiv sodium hydroxide tov. Rov qab cuam tshuam hydothermal ntawm 170 ℃ rau 12 teev los npaj cerium oxide nanorods nrog nthuav tawm (111) thiab (110) cov dav hlau crystal. Los ntawm kev kho cov tshuaj tiv thaiv cov tshuaj tiv thaiv cov tshuaj tiv thaiv kev ua haujlwm hauv cov dav hlau crystal tuaj yeem nce ntxiv, ua kom muaj kev ua haujlwm catalytic. Kho cov tshuaj tiv thaiv cov tshuaj tiv thaiv thiab cov tshuaj ligand kuj tseem tuaj yeem tsim NANO contria hais nrog tshwj xeeb hydrophilicity lossis Lipophilicity. Piv txwv li, ntxiv cov ions rau theem aqueous tuaj yeem npaj monodisperse hydrothilic cerium oxide nanoparticles hauv dej. Los ntawm kev xaiv ib qho tsis-ncej puab thiab qhia txog oleic acid li ib lub lighad thaum lub sij hawm cov tshuaj tiv thaiv no nanoparticles tuaj yeem npaj rau hauv cov kuab tshuaj uas tsis yog-polar emolents. (Saib Daim Duab 1)
Daim Duab 1 ManOdisperse Spherical Spherical Spherical Spherical Spherical Spherical Spherical Ceria Thiab Qws-Ceria
1.4 Sol gel txoj kev
Tus txheej txheem nce los yog ib txoj kev uas siv qee qhov lossis cov qauv tshuaj pleev ib yam li cov khoom noj ua kua, thiab tom qab ntawd cov tshuaj lom neeg tom qab kev laus thiab cov calcines los npaj cov hmoov ntxiv. Hom no yog tsim tshwj xeeb rau kev npaj cov dispersed heev mane-ceria composite nanocium thiab lwm yam nano oxides, uas tau tshaj tawm hauv ntau daim ntawv ceeb toom.
1.5 Lwm txoj hauv kev
Ntxiv rau cov txheej txheem saum toj no, tseem muaj micro lotion txoj kev, microwave synthesion txoj kev, ion-mauv taws sib zog ntawm cov qauv electrolysis thiab ntau lwm txoj kev. Cov hau kev no muaj qhov tseem ceeb rau kev tshawb fawb thiab kev thov ntawm NANA ceria.
Daim Ntawv Thov ntawm 2-Nanometer Cartium oxide hauv kev kho dej
Cerium yog qhov muaj txiaj ntsig ntau ntau hauv lub ntiaj teb tsis tshua muaj txiaj ntsig, nrog cov nqi qis thiab cov ntawv thov dav. Nanometer Ceria thiab nws cov composites tau nyiam ntau ntau hauv kev kho dej vim lawv qhov chaw siab tshwj xeeb, kev ua haujlwm siab thiab cov txheej txheem ruaj khov.
2.1 Daim ntawv thov ntawmNoo cerium oxideHauv kev kho dej los ntawm cov qauv adsorption
Nyob rau hauv xyoo tsis ntev los no, nrog kev txhim kho kev lag luam xws li kev lag luam hluav taws xob, muaj cov dej khib nyiab loj xws li cov tshuaj tiv thaiv hlau hnyav thiab cov tshuaj funorine tau raug tso tawm. Txawm tias ntawm txoj kab kev muaj mob, nws tuaj yeem ua rau muaj kev phom sij rau dej yug tsiaj thiab tib neeg nyob. Cov hau kev feem ntau suav nrog oxidation, frolotment, rov ua haujlwm etmosis, rov ua haujlwm ntawm lawv cov haujlwm yooj yim, tus nqi qis, thiab siv nyiaj tsawg. Nano CEO2 cov ntaub ntawv muaj cov chaw nyob hauv thaj chaw zoo thiab muaj ntau cov lus qhia txog cov tshuaj thiab cov khoom sib txawv rau ADSORRB thiab tshem cov phom sij thiab tshem tawm cov phom sij.
Kev tshawb fawb tau pom tias NANA ceria muaj cov adsorption muaj zog rau F - hauv dej nyob rau hauv cov tsis muaj zog acidic tej yam kev mob. Nyob rau hauv kev daws nrog tus thawj lub siab ntawm F - ntawm 100mg / L thiab ph = 5-6g / g, thiab kev tshem tawm ntawm F - yog 85.6%. Tom qab thauj nws mus rau lub polyacrylic retin pob (chaw thau khoom: 0.25g / g), thaum kho lub peev xwm ntawm kev sib npaug ntawm 100mg / l ntawm F - aqueous kev daws; Thaum ua 120 zaug lub ntim, ntau dua 90% ntawm F - tuaj yeem tshem tawm. Thaum siv los adsorb phosphate thiab iodate muaj peev xwm ncav cuag ntau dua 100mg / g nyob rau hauv lub xeev sib xws. Cov khoom siv uas siv tau tuaj yeem siv tau tom qab kev cawm dim thiab kev kho mob nruab nrab, uas muaj cov txiaj ntsig nyiaj siab.
Muaj ntau txoj kev tshawb fawb txog kev kos duab thiab kev kho cov hlau hnyav xws li arsenic hnyav xws li arsenic hnyav, cadmium, cadmium, thiab txhuas siv nano ceria thiab nws cov khoom siv. Qhov zoo tshaj plaws Adsorption PX varies rau cov hlau hnyav ions nrog lub peev xwm sib txawv. Piv txwv li, cov tsis muaj zog alkaline muaj cov kev tsis ncaj ncees muaj qhov zoo tshaj plaws hauv lub xeev rau cov neeg tsis muaj zog, thaum lub peev xwm adsorption tau mus txog 110mg / g nyob rau hauv ob qho kev mob. Zuag qhia tag nrho, cov khoom siv hluav taws xob zoo ntawm NANA ceria thiab nws cov ntaub ntawv sib xyaw tuaj yeem ua tiav cov khoom tiav siab thiab tshem tawm cov hlau hnyav rau ntau hom hluav taws xob ntau dua.
Ntawm qhov tod tes, cerium oxide raws li cov txheej txheem adsorbing, xws li cov kab mob liab, thiab lwm yam, hauv kev tshem tawm cov kab mob liab, nrog kev tshaj tawm muaj peev xwm ntawm 942.7mg / g nyob rau 60 feeb.
2.2 Daim ntawv thov ntawm NANA ceria nyob rau hauv kev kawm qib siab oxidation
Advanced oxidation txheej txheem (Aops luv luv) tau npaj siab los txhim kho cov txheej txheem kev kho mob uas twb muaj lawm. Advanced oxidation oxidation txheej txheem, tseem hu ua kev sib sib zog nqus oxidation technology, yog cov cwj pwm los ntawm kev tsim cov hydroxylarical (· Ochy (OSC. nrog cov pa oxidation muaj zog. Nyob rau hauv cov kev tshwm sim ntawm cov kev mob siab thiab siab, hluav taws xob, catoralcht oxidation, lawv tuaj yeem faib ua ke, thiab cov tshuaj tiv thaiv oxidation, fenton oxidation, thiab lwm yam (saib daim duab 2).
Daim duab 2 Kev faib tawm thiab kev sib txuam ntawm cov txheej txheem ua ke ntawm cov txheej txheem oxidation siab
NANA ceriayog heterogeneous catalalts feem ntau siv nyob rau hauv qib kev txheej txheem Oxidation. Vim kev hloov pauv sai ntawm CE3 + thiab CE4 + thiab kev txo cov txiaj ntsig oxygen kev nqus thiab tso, nano ceria muaj peev xwm zoo catalytic. Thaum siv ua tus txhawb nqa catalyst, nws tseem tuaj yeem txhim kho kev muaj peev xwm catalytic thiab ruaj khov. Thaum NANA ceria thiab nws cov ntaub ntawv sib xyaw yog siv los ua catalysts, cov dav hlau catalysts sib txawv nrog cov dav xob morphology, thiab nthuav tawm cov dav hlau cense, uas yog qhov tseem ceeb cuam tshuam rau lawv cov kev ua tau zoo thiab kev thov. Nws yog feem ntau ntseeg hais tias cov lus me me thiab qhov loj dua qhov chaw tshwj xeeb thaj tsam, lub peev xwm ntau dua, thiab lub peev xwm muaj zog muaj zog dua. Lub peev xwm catalytic ntawm cov crystal muaj lead ua ke, los ntawm muaj zog rau tsis muaj zog, yog nyob rau hauv qhov kev txiav txim ntawm (100) Crystal nto> (111) Crystal nto, thiab sib luag ruaj khov yog rov qab.
Creium oxide yog cov khoom siv semiconductor. Thaum Nanometer Cine oxide yog irradiated los ntawm lub zog siab dua li cov hluav taws xob ntau dua li cov hluav taws xob txuas ntxiv, thiab kev hloov pauv hloov pauv hloov tshiab. Tus cwj pwm no yuav txhawb txoj kev hloov pauv ntawm CE3 + thiab CE4 +, uas ua rau muaj zog photocatalytic ua haujlwm ntawm NANA ceria. Photocatalysis tuaj yeem ua tiav qhov ncaj qha ntawm cov organic muaj teeb meem tsis muaj kuab paug ntxiv, yog li nws daim ntawv thov yog cov thev naus laus zis hauv tebchaws NANA ceria hauv oops. Tam sim no, lub ntsiab tseem ceeb yog nyob rau ntawm catalytic depradation degees doj, thiab kws tshuaj lim dej siv cov cathalys, thiab kws tshuaj lim dej nrog cov morphologies sib txawv thiab cov khoom sib xyaw. Raws li tsab ntawv ceeb toom, raws li cov qauv kev ua kom zoo nkauj thiab cov qauv ntawm cov organic carbon (TOC) tuaj yeem ncav ntau dua 40%.
Nano cerium oxide catalysis rau qhov degradation ntawm organic kuab paug xws li ozone thiab hydrogen peroxide yog lwm qhov kev hloov pauv dav dav. Zoo ib yam li photocatalysisysis, nws tseem tsom rau lub peev xwm ntawm cov qauv morphologies sib txawv thiab cov cineTal cerium sib txawv raws cov oxidize thiab txwv tsis pub muaj kuab paug. Nyob rau hauv cov kev coj ua, catalysts tuaj yeem ua kom muaj qhov ntau ntawm cov neeg muaj kuab paug lossis ua tiav cov orgiidatsis ntau yam. Vim tias cov lus qhia ntawm oxidants hauv cov tshuaj tiv thaiv, muaj peev xwm tshem tawm cov organic sib txuas yog tau zoo heev. Feem ntau cov kev tawm tsam, qhov kev tshem tawm zaum kawg ntawm lub hom phiaj tshuaj tuaj yeem ncav lossis kev tshem tawm 100%, thiab kev tshem tawm toC tau nce ntxiv.
Nyob rau hauv electrocatalytic Advanced Oxidation Oxidation Oxidation txheej txheem, cov khoom ntawm cov oxygen adjection ololatalytic oxidation txoj kev rau kev kho cov pa phem. Cov khoom siv cathode yog qhov tseem ceeb tshaj plaws txiav txim siab qhov kev tsim khoom H2O2, thiab cov kev tsim tawm ntawm electrocatalytic oxidation txoj kev rau kev kho cov pa phem. Txoj kev kawm ntawm electrode cov khoom hloov kho hloov kho siv nano ceria tau txais dav heev kev saib xyuas ob qho tib si hauv tsev thiab thoob ntiaj teb. Cov kws tshawb nrhiav tsuas yog qhia nano cine oxide thiab nws cov khoom siv sib xyaw los ntawm cov khoom siv hluav taws xob sib txawv, thiab yog li ua kom cov kev ua hluav taws xob sib txawv thiab cov nqi tshem tawm zaum kawg.
Microwave thiab ultrasound yog feem ntau tseem ceeb ib qho kev ntsuas ntsuas rau cov qauv catalytic saum toj no. Siv cov kev pab ultrasonic ua piv txwv, siv suab nrov nrog zaus nrog ntau dua 25kHz ib thib ob, ntau lab tus neeg saib xyuas kev tu nrog tus neeg saib xyuas tu. Cov npuas me me no, thaum lub sijhawm nrawm nrawm thiab nthuav dav, cia cov khoom siv npuas, ua kom muaj kev sib pauv nrawm nrawm, feem ntau txhim kho kev ua haujlwm catalysic.
3 Xaus
NANA ceria thiab nws cov khoom siv puas tuaj yeem kho ions thiab cov organic paug nyob hauv dej, thiab muaj cov peev txheej tseem ceeb hauv cov dej kho yav tom ntej. Txawm li cas los xij, feem kev tshawb fawb tseem nyob hauv chav kuaj, thiab txhawm rau ua tiav cov ntawv thov ceev hauv lub neej tom ntej, cov teeb meem hauv qab no tseem yuav tsum tau hais kom sai:
(1) Tus nqi npaj siab ntawm nanoTus kab khiavRaws li cov ntaub ntawv tseem yog qhov tseem ceeb hauv lawv cov ntawv thov hauv kev kho dej, uas tseem nyob hauv chav kuaj tshawb fawb theem. Tshawb nrhiav tus nqi qis, yooj yim thiab ua tau zoo npaj cov qauv uas tuaj yeem tswj hwm cov morphology thiab loj ntawm nano cov ntaub ntawv tseem yog kev tshawb fawb.
(2) Vim yog cov khoom me me ntawm Nano CEO2 raws cov ntaub ntawv, cov teeb meem rov ua dua tshiab tom qab kev siv yog qhov tseem ceeb tshaj plaws txwv lawv daim ntawv thov. Qhov sib xyaw nrog nws nrog cov ntaub ntawv cob qhia lossis cov ntaub ntawv sib nqus yuav yog cov kev tshawb nrhiav tseem ceeb rau nws cov khoom npaj thiab rov siv thev naus laus zis.
(3) Kev txhim kho cov txheej txheem sib koom ua ke ntawm Nano CEO2 raws cov khoom siv dej los yog siv cov khoom siv catalanytic hauv kev kho cov dej.
(4) Tseem tseem muaj kev tshawb fawb tseem ceeb ntawm Nano CEO2 raws cov ntaub ntawv, thiab lawv cov kev coj ua ib puag ncig thiab kev lom neeg lub tshuab nqus dej tsis tau txiav txim siab tsis tau. Qhov kev siv dej phwj tuaj ntau feem ntau cuam tshuam nrog kev sib xyaw ntawm ntau lwm yam paug, thiab cov kuab paug saum npoo av thiab tej zaum muaj txiaj ntsig ntawm nanomaterials. Yog li ntawd, muaj kev yuav tsum tau ua ntau yam kev tshawb fawb txog kev cuam tshuam txog kev sib cuam tshuam.
Lub sij hawm Post: Tsib Hlis-22-2023