Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Advanced Materials thiab Chemical Engineering, University of Science thiab Technology (UST), Daejeon, 34113 Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Advanced Materials thiab Chemical Engineering, University of Science thiab Technology (UST), Daejeon, 34113 Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Advanced Materials thiab Chemical Engineering, University of Science thiab Technology (UST), Daejeon, 34113 Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Advanced Materials thiab Chemical Engineering, University of Science thiab Technology (UST), Daejeon, 34113 Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Advanced Materials thiab Chemical Engineering, University of Science thiab Technology (UST), Daejeon, 34113 Republic of Kauslim
Kauslim Lub Tsev Kawm Ntawv ntawm Tshuaj Technology (KRICT) Biobased Chemistry Research Center, Ulsan, 44429, Republic of Kauslim
Advanced Materials thiab Chemical Engineering, University of Science thiab Technology (UST), Daejeon, 34113 Republic of Kauslim
Siv qhov txuas hauv qab no los qhia tag nrho cov ntawv nyeem ntawm kab lus no nrog koj cov phooj ywg thiab cov npoj yaig.kawm ntxiv.
Vim muaj tus kab mob coronavirus pandemic thiab cov teeb meem ntsig txog cov teeb meem (PM) hauv huab cua, qhov kev thov rau lub qhov ncauj qhov ntswg tau nce zuj zus.Txawm li cas los xij, cov lim dej ib txwm siv raws li hluav taws xob zoo li qub thiab nano sieve yog txhua yam pov tseg, tsis tuaj yeem degradable lossis rov ua dua, uas yuav ua rau muaj teeb meem loj.Tsis tas li ntawd, tus qub yuav poob nws txoj haujlwm nyob rau hauv cov av ntub, thaum lub sijhawm tom kawg yuav ua haujlwm nrog cov huab cua tseem ceeb poob thiab qhov pore ceev yuav tshwm sim.Ntawm no, biodegradable, noo noo-pov thawj, breathable, high-performance fiber npog lim tau raug tsim.Hauv luv luv, ob lub biodegradable ultrafine fibers thiab nanofiber mats tau muab tso rau hauv Janus membrane lim, thiab tom qab ntawd coated nrog cationically them chitosan nanowhiskers.Cov lim dej no muaj txiaj ntsig zoo li kev lag luam N95 lim thiab tuaj yeem tshem tawm 98.3% ntawm 2.5 µm PM.Nanofibers lub cev tshuaj xyuas cov khoom zoo, thiab cov fibers ultrafine muab qhov sib txawv ntawm 59 Pa, uas haum rau tib neeg ua pa.Tsis zoo li qhov poob qis hauv kev ua haujlwm ntawm kev lag luam N95 lim dej thaum raug cov dej noo, kev ua haujlwm tsis zoo ntawm cov lim dej no yog qhov tsis txaus ntseeg, yog li nws tuaj yeem siv ntau zaus vim tias cov dipole mus tas li ntawm chitosan adsorbs ultrafine PM (piv txwv li, nitrogen).Thiab sulfur oxides).Nws yog ib qho tseem ceeb uas cov lim no tag nrho decomposes hauv cov av composted hauv 4 lub lis piam.
Tam sim no tsis tau muaj tus kab mob coronavirus pandemic (COVID-19) tau ua rau muaj kev xav tau ntau rau lub qhov ncauj qhov ntswg.[1] Lub Koom Haum Saib Xyuas Kev Noj Qab Haus Huv Ntiaj Teb (WHO) kwv yees tias 89 lab lub ntsej muag kho mob xav tau txhua lub hlis xyoo no.[1] Tsis tsuas yog cov kws kho mob xav tau lub ntsej muag zoo N95, tab sis lub ntsej muag dav dav rau txhua tus neeg kuj tau dhau los ua cov khoom siv niaj hnub tseem ceeb rau kev tiv thaiv kab mob ua pa.[1] Tsis tas li ntawd, cov haujlwm tseem ceeb tau pom zoo kom siv lub qhov ncauj qhov ntswg pov tseg txhua hnub, [1] qhov no tau ua rau muaj teeb meem ib puag ncig cuam tshuam nrog ntau cov npog ntsej muag pov tseg.
Txij li cov teeb meem me me (PM) tam sim no yog qhov teeb meem huab cua phem tshaj plaws, qhov ncauj qhov ntswg tau dhau los ua qhov ntsuas tau zoo tshaj plaws rau cov tib neeg.PM tau muab faib ua PM2.5 thiab PM10 raws li qhov loj me (2.5 thiab 10μm feem), uas cuam tshuam rau ib puag ncig ntuj [2] thiab kev ua neej zoo ntawm tib neeg hauv ntau txoj hauv kev.[2] Txhua xyoo, PM ua rau 4.2 lab tus neeg tuag thiab 103.1 lab kev xiam oob qhab hloov lub neej xyoo.[2] PM2.5 ua rau muaj kev hem thawj tshwj xeeb rau kev noj qab haus huv thiab raug xaiv los ua pawg I carcinogen.[2] Yog li ntawd, nws yog lub sijhawm thiab tseem ceeb rau kev tshawb fawb thiab tsim lub ntsej muag lim dej kom zoo raws li huab cua permeability thiab PM tshem tawm.[3]
Feem ntau hais lus, cov khoom siv lim fiber ntau ntes PM hauv ob txoj kev sib txawv: los ntawm lub cev sieving raws li nanofibers thiab electrostatic adsorption raws li microfibers (Daim duab 1a).Kev siv cov ntxaij lim dej nanofiber, tshwj xeeb tshaj yog electrospun nanofiber mats, tau ua pov thawj tias yog ib lub tswv yim zoo los tshem PM, uas yog qhov tshwm sim ntawm cov khoom siv dav thiab cov qauv khoom tswj tau.[3] Lub nanofiber lev tuaj yeem tshem tawm cov khoom ntawm lub hom phiaj loj, uas yog tshwm sim los ntawm qhov sib txawv me me ntawm cov khoom thiab qhov hws.[3] Txawm li cas los xij, nano-scale fibers yuav tsum tau sib zog ua ke los tsim cov pores me me, uas ua rau muaj kev phom sij rau tib neeg ua pa vim muaj kev sib txawv siab.Tsis tas li ntawd, qhov me me yuav inevitably raug thaiv sai heev.
Ntawm qhov tod tes, lub meltblown ultra-fine fiber lev yog electrostatically them los ntawm lub zog hluav taws xob, thiab cov khoom me me heev raug ntes los ntawm electrostatic adsorption.[4] Raws li tus neeg sawv cev piv txwv, N95 lub tshuab ua pa yog lub ntsej muag lub ntsej muag lub ntsej muag lub ntsej muag uas ua tau raws li cov cai ntawm National Institute of Occupational Safety and Health vim tias nws tuaj yeem lim tau tsawg kawg 95% ntawm cov pa hauv huab cua.Hom lim no absorbs ultrafine PM, uas feem ntau yog tsim los ntawm anionic tshuaj xws li SO42- thiab NO3-, los ntawm muaj zog electrostatic attraction.Txawm li cas los xij, tus nqi zoo li qub nyob rau saum npoo ntawm fiber ntau yog yooj yim dissipated nyob rau hauv ib qho chaw ntub, xws li pom nyob rau hauv cov neeg ua pa tsis zoo, [4] ua rau txo qis hauv adsorption muaj peev xwm.
Txhawm rau txhawm rau txhim kho kev ua haujlwm pom lossis daws qhov kev lag luam tawm ntawm kev tshem tawm kev ua haujlwm thiab kev poob siab, cov ntxaij lim dej raws li nanofibers thiab microfibers tau ua ke nrog cov khoom siv high-k, xws li cov ntaub ntawv carbon, hlau organic moj khaum, thiab PTFE nanoparticles.[4] Txawm li cas los xij, qhov tsis paub tseeb txog kev lom neeg lom neeg thiab kev them nqi dissipation ntawm cov additives no tseem tsis muaj teeb meem.[4] Tshwj xeeb, ob hom kev lim dej no feem ntau tsis tuaj yeem degradable, yog li lawv yuav nws thiaj li raug muab faus rau hauv qhov chaw pov tseg lossis incinerated tom qab siv.Yog li ntawd, kev txhim kho lub ntsej muag lub ntsej muag zoo dua los daws cov teeb meem pov tseg no thiab tib lub sijhawm ntes PM hauv qhov txaus siab thiab muaj zog yog qhov tseem ceeb tam sim no xav tau.
Txhawm rau daws cov teeb meem saum toj no, peb tau tsim cov lim dej Janus membrane nrog poly (butylene succinate)-raws li (PBS-based) [5] microfiber thiab nanofiber lev.Lub Janus membrane lim yog coated nrog chitosan nano whiskers (CsWs) [5] (Daim duab 1b).Raws li peb txhua tus paub, PBS yog tus sawv cev biodegradable polymer, uas tuaj yeem tsim cov fiber ntau thiab nanofiber nonwovens los ntawm electrospinning.Nano-scale fibers lub cev cuab yeej PM, thaum micro-scale nano-fibers txo qhov poob siab thiab ua raws li CsW lub luag haujlwm.Chitosan yog cov khoom siv bio-based uas tau raug pov thawj tias muaj cov khoom siv roj ntsha zoo, suav nrog biocompatibility, biodegradability thiab tsis tshua muaj toxicity, [5] uas tuaj yeem txo cov kev ntxhov siab cuam tshuam nrog kev ua pa tsis zoo ntawm cov neeg siv.[5] Tsis tas li ntawd, chitosan muaj cationic sites thiab polar amide pawg.[5] Txawm tias nyob rau hauv cov huab cua ntub, nws tuaj yeem nyiam cov polar ultrafine hais (xws li SO42- thiab NO3-).
Ntawm no, peb tshaj tawm txog biodegradable, high-efficiency, noo noo-pov thawj thiab tsis tshua muaj siab poob lub ntsej muag lim raws li cov ntaub ntawv uas muaj biodegradable.Vim yog kev sib xyaw ntawm lub cev sieving thiab electrostatic adsorption, CsW-coated microfiber / nanofiber integrated lim muaj PM2.5 tshem tawm efficiency siab (txog 98%), thiab nyob rau tib lub sij hawm, qhov siab tshaj plaws poob ntawm lub thickest lim yog Tsuas yog 59 Pa, haum rau tib neeg ua pa.Piv nrog rau qhov tseem ceeb ntawm kev ua haujlwm tsis zoo uas tau nthuav tawm los ntawm N95 kev lag luam lim, cov lim dej no ua rau pom qhov tsis zoo ntawm PM tshem tawm kev ua haujlwm zoo (<1%) txawm tias ntub dej tag nrho, vim yog CsW tus nqi tas mus li.Tsis tas li ntawd, peb cov ntxaij lim dej tau ua tiav biodegradable hauv cov av composted hauv 4 lub lis piam.Piv nrog rau lwm cov kev tshawb fawb nrog cov ntsiab lus zoo sib xws, nyob rau hauv uas lim ib feem yog tsim los ntawm biodegradable cov ntaub ntawv, los yog qhia tau hais tias tsis muaj kev ua tau zoo nyob rau hauv tej zaum biopolymer nonwoven daim ntaub ntawv, [6] lim no ncaj qha qhia Biodegradability ntawm advanced nta (movie S1, txhawb cov ntaub ntawv).
Raws li ib feem ntawm Janus membrane lim, nanofiber thiab superfine fiber PBS lev tau npaj ua ntej.Yog li, 11% thiab 12% PBS cov kev daws teeb meem yog electrospun los tsim cov nanometer thiab micrometer fibers, feem, vim lawv qhov sib txawv ntawm viscosity.[7] Cov ncauj lus kom ntxaws txog cov yam ntxwv ntawm kev daws teeb meem thiab kev pom zoo electrospinning tej yam kev mob tau teev nyob rau hauv Tables S1 thiab S2, hauv cov ntaub ntawv txhawb nqa.Txij li thaum lub as-spun fiber tseem muaj cov kuab tshuaj seem, ntxiv dej coagulation da dej ntxiv rau cov khoom siv electrospinning, raws li qhia hauv daim duab 2a.Tsis tas li ntawd, cov dej da dej kuj tseem tuaj yeem siv cov thav duab los sau cov coagulated ntshiab PBS fiber ntau lev, uas txawv ntawm cov khoom matrix nyob rau hauv cov tsoos chaw (Daim duab 2b).[7] Qhov nruab nrab fiber ntau diameters ntawm microfiber thiab nanofiber mats yog 2.25 thiab 0.51 µm, feem, thiab qhov nruab nrab pore diameters yog 13.1 thiab 3.5 µm, raws li (Daim duab 2c, d).Raws li 9: 1 chloroform / ethanol hnyav evaporates sai sai tom qab tso tawm ntawm lub nozzle, viscosity txawv ntawm 11 thiab 12 wt% kev daws teeb meem nce sai (Daim duab S1, cov ntaub ntawv txhawb nqa).[7] Yog li ntawd, qhov sib txawv ntawm qhov sib txawv ntawm tsuas yog 1 wt% tuaj yeem ua rau muaj kev hloov pauv loj hauv fiber ntau.
Ua ntej kuaj xyuas cov kev ua haujlwm lim dej (Daim duab S2, cov ntaub ntawv txhawb nqa), txhawm rau txhawm rau sib piv ntau cov ntxaij lim dej tsim nyog, electrospun nonwovens ntawm cov qauv tuab tau tsim, vim tias cov tuab yog qhov tseem ceeb uas cuam tshuam rau qhov sib txawv ntawm qhov sib txawv thiab pom kev ua haujlwm ntawm cov lim dej.Txij li cov nonwovens yog mos thiab ntxeem tau, nws yog ib qho nyuaj rau ncaj qha mus txiav txim lub thickness ntawm electrospun nonwovens.Lub thickness ntawm cov ntaub yog feem ntau sib npaug rau qhov ntom ntom (hnyav rau ib cheeb tsam, lub siab hnyav).Yog li ntawd, nyob rau hauv txoj kev tshawb no, peb siv lub hauv paus luj (gm-2) raws li ib tug zoo ntsuas ntawm thickness.[8] Lub thickness yog tswj los ntawm kev hloov lub sij hawm electrospinning, raws li qhia nyob rau hauv daim duab 2e.Raws li lub sij hawm spinning nce los ntawm 1 feeb mus rau 10 feeb, lub thickness ntawm microfiber lev nce mus rau 0.2, 2.0, 5.2, thiab 9.1 gm-2, raws li.Ib yam li ntawd, lub thickness ntawm nanofiber lev tau nce mus rau 0.2, 1.0, 2.5, thiab 4.8 gm-2, feem.Microfiber thiab nanofiber mats yog tsim los ntawm lawv cov thickness qhov tseem ceeb (gm-2) li: M0.2, M2.0, M5.2 thiab M9.1, thiab N0.2, N1.0, N2.5 thiab N4. 8.
Cov huab cua sib txawv (ΔP) ntawm tag nrho cov qauv yog ib qho tseem ceeb qhia txog kev ua haujlwm lim dej.[9] Ua pa los ntawm lub lim nrog lub siab poob siab tsis xis nyob rau tus neeg siv.Lawm, nws tau pom tias qhov kev poob siab nce ntxiv raws li lub thickness ntawm lub lim nce, raws li qhia hauv daim duab S3, txhawb cov ntaub ntawv.Lub nanofiber lev (N4.8) qhia tau hais tias lub siab poob siab dua li microfiber (M5.2) lev ntawm qhov sib piv thickness vim hais tias nanofiber lev muaj me me pores.Raws li cov huab cua dhau los ntawm cov lim dej ntawm qhov ceev ntawm 0.5 thiab 13.2 ms-1, lub siab poob ntawm ob hom lim sib txawv maj mam nce los ntawm 101 Pa mus rau 102 Pa. Lub thickness yuav tsum tau optimized kom sib npaug lub siab poob thiab PM tshem tawm. efficiency;huab cua tshaj tawm ntawm 1.0 ms-1 yog qhov tsim nyog vim tias lub sijhawm nws siv rau tib neeg ua pa los ntawm qhov ncauj yog li 1.3 ms-1.[10] Nyob rau hauv no hais txog, lub siab poob ntawm M5.2 thiab N4.8 yog tau ntawm ib tug huab cua tshaj tawm ntawm 1.0 ms-1 (tsawg dua 50 Pa) (Daim duab S4, txhawb cov ntaub ntawv).Thov nco ntsoov tias qhov poob siab ntawm N95 thiab cov qauv lim dej zoo sib xws (KF94) lub ntsej muag yog 50 txog 70 Pa, raws li.Ntxiv CsW ua thiab micro / nano lim kev koom ua ke tuaj yeem ua rau huab cua tsis kam;Yog li ntawd, txhawm rau muab qhov siab poob qis, peb tau txheeb xyuas N2.5 thiab M2.0 ua ntej tshuaj xyuas M5.2 thiab N4.8.
Ntawm lub hom phiaj huab cua tshaj tawm ntawm 1.0 ms-1, qhov kev tshem tawm ntawm PM1.0, PM2.5, thiab PM10 ntawm PBS microfiber thiab nanofiber mats tau kawm yam tsis muaj nqi zoo li qub (Daim duab S5, cov ntaub ntawv txhawb nqa).Nws tau pom tias PM tshem tawm kev ua haujlwm feem ntau nce nrog qhov nce hauv thickness thiab PM loj.Qhov kev tshem tawm ntawm N2.5 yog qhov zoo dua li M2.0 vim nws qhov pores me dua.Kev tshem tawm cov txiaj ntsig ntawm M2.0 rau PM1.0, PM2.5 thiab PM10 yog 55.5%, 64.6% thiab 78.8%, feem, thaum cov txiaj ntsig zoo sib xws ntawm N2.5 yog 71.9%, 80.1% thiab 89.6% (Daim duab 2 f).Peb pom tias qhov sib txawv loj tshaj plaws ntawm kev ua haujlwm ntawm M2.0 thiab N2.5 yog PM1.0, uas qhia tau hais tias lub cev sieving ntawm microfiber mesh yog siv rau micron-theem PM, tab sis tsis zoo rau nano-level PM (Daim duab S6, txhawb cov ntaub ntawv)., M2.0 thiab N2.5 ob qho tib si qhia tau tias PM tsis muaj peev xwm ntes tsawg dua 90%.Tsis tas li ntawd, N2.5 tuaj yeem ua rau cov plua plav ntau dua li M2.0, vim tias cov plua plav tuaj yeem yooj yim thaiv qhov me me ntawm N2.5.Nyob rau hauv qhov tsis muaj tus nqi zoo li qub, lub cev sieving yog txwv nyob rau hauv nws lub peev xwm kom ua tiav qhov yuav tsum tau ua kom poob siab thiab tshem tawm kev ua haujlwm zoo tib lub sijhawm vim yog kev sib raug zoo ntawm kev sib raug zoo ntawm lawv.
Electrostatic adsorption yog txoj kev siv dav tshaj plaws los ntes PM hauv qhov ua tau zoo.[11] Feem ntau, tus nqi zoo li qub raug yuam siv rau cov lim tsis-woven los ntawm lub zog hluav taws xob siab;Txawm li cas los xij, tus nqi zoo li qub no tau yooj yim dissipated nyob rau hauv cov huab cua ntub, ua rau poob ntawm PM capture peev xwm.[4] Raws li cov khoom siv bio-based rau electrostatic pom, peb tau qhia txog 200 nm ntev thiab 40 nm dav CsW;vim lawv pawg ammonium thiab polar amide pawg, cov nanowhiskers no muaj cov nqi cationic tas li.Qhov muaj txiaj ntsig zoo nyob rau saum npoo ntawm CsW yog sawv cev los ntawm nws lub peev xwm zeta (ZP);CsW yog dispersed nyob rau hauv dej nrog pH ntawm 4.8, thiab lawv ZP pom tau tias yog +49.8 mV (Daim duab S7, cov ntaub ntawv txhawb nqa).
CsW-coated PBS microfibers (ChMs) thiab nanofibers (ChNs) tau npaj los ntawm cov txheej txheem yooj yim dip hauv 0.2 wt% CsW dej dispersion, uas yog qhov tsim nyog kom xa cov nyiaj ntau tshaj ntawm CsWs rau saum npoo ntawm PBS fibers, raws li qhia hauv Daim duab Qhia hauv daim duab 3a thiab daim duab S8, txhawb cov ntaub ntawv.Daim duab nitrogen zog dispersive X-ray spectroscopy (EDS) daim duab qhia tau hais tias lub nto ntawm PBS fiber ntau yog uniformly coated nrog CsW hais, uas kuj yog tshwm sim nyob rau hauv lub scanning electron microscope (SEM) duab (Daim duab 3b; daim duab S9, txhawb cov ntaub ntawv) .Tsis tas li ntawd, qhov txheej txheem txheej txheej no tso cai rau cov khoom siv nano kom zoo qhwv cov fiber ntau, yog li ua kom muaj peev xwm tshem tawm electrostatic PM (Daim duab S10, cov ntaub ntawv txhawb nqa).
Kev tshem tawm PM ntawm ChM thiab ChN tau kawm (Daim duab 3c).M2.0 thiab N2.5 tau coated nrog CsW los tsim ChM2.0 thiab ChN2.5, feem.Kev tshem tawm cov txiaj ntsig ntawm ChM2.0 rau PM1.0, PM2.5 thiab PM10 yog 70.1%, 78.8% thiab 86.3%, feem, thaum cov txiaj ntsig zoo sib xws ntawm ChN2.5 yog 77.0%, 87.7% thiab 94.6% feem.CsW txheej zoo heev txhim kho qhov kev tshem tawm ntawm M2.0 thiab N2.5, thiab cov nyhuv pom zoo rau me me PM yog qhov tseem ceeb dua.Tshwj xeeb, chitosan nanowhiskers tau nce qhov kev tshem tawm ntawm M2.0′s PM0.5 thiab PM1.0 los ntawm 15% thiab 13%, feem (Daim duab S11, cov ntaub ntawv txhawb nqa).Txawm hais tias M2.0 nyuaj rau tshem tawm me me PM1.0 vim nws qhov dav ntawm fibril spacing (Daim duab 2c), ChM2.0 adsorbs PM1.0 vim tias cov cations thiab amides hauv CsWs dhau los ntawm ion-ion, coupling Pole-ion kev cuam tshuam. , thiab dipole-dipole kev sib cuam tshuam nrog hmoov av.Vim nws cov CsW txheej, PM tshem tawm efficiency ntawm ChM2.0 thiab ChN2.5 yog siab npaum li cov tuab M5.2 thiab N4.8 (Table S3, txhawb cov ntaub ntawv).
Interestingly, txawm hais tias PM tshem tawm efficiency zoo heev, CsW txheej hardly cuam tshuam lub siab poob.Lub siab poob ntawm ChM2.0 thiab ChN2.5 nce me ntsis mus rau 15 thiab 23 Pa, yuav luag ib nrab ntawm qhov kev nce ntxiv rau M5.2 thiab N4.8 (Daim duab 3d; Table S3, cov ntaub ntawv txhawb nqa).Yog li ntawd, txheej txheej nrog cov ntaub ntawv bio-based yog ib txoj hauv kev tsim nyog kom ua tau raws li qhov yuav tsum tau ua ntawm ob lub lim dej yooj yim;uas yog, PM tshem tawm efficiency thiab huab cua siab sib txawv, uas yog kev sib koom ua ke.Txawm li cas los xij, PM1.0 thiab PM2.5 tshem tawm efficiency ntawm ChM2.0 thiab ChN2.5 yog ob qho tib si qis dua 90%;pom tseeb, qhov kev ua tau zoo no yuav tsum tau txhim kho.
Ib qho kev pom kev sib xyaw ua ke los ntawm ntau lub membranes nrog maj mam hloov fiber ntau diameters thiab qhov pore loj tuaj yeem daws cov teeb meem saum toj no [12].Cov lim cua sib xyaw ua ke muaj qhov zoo ntawm ob qhov sib txawv nanofibers thiab superfine fiber ntau nets.Hauv qhov no, ChM thiab ChN tsuas yog muab tso ua ke los tsim cov lim dej sib xyaw (Int-MNs).Piv txwv li, Int-MN4.5 yog npaj siv ChM2.0 thiab ChN2.5, thiab nws cov kev ua tau zoo yog piv nrog ChN4.8 thiab ChM5.2 uas muaj qhov sib xws ntawm thaj chaw ntom ntom (ie thickness).Nyob rau hauv PM tshem tawm efficiency sim, lub ultrafine fiber sab ntawm Int-MN4.5 tau nthuav tawm nyob rau hauv lub plua plav chav tsev vim hais tias cov ultrafine fiber sab yog ntau resistant rau clogging tshaj sab nanofiber.Raws li pom nyob rau hauv daim duab 4a, Int-MN4.5 qhia tau hais tias zoo PM tshem tawm efficiency thiab siab sib txawv tshaj li ob lub ntsiab lus lim, nrog ib tug siab poob ntawm 37 Pa, uas zoo ib yam li ChM5.2 thiab ntau qis dua ChM5.2 ChN4.8. Tsis tas li ntawd, PM1.0 tshem tawm efficiency ntawm Int-MN4.5 yog 91% (Daim duab 4b).Ntawm qhov tod tes, ChM5.2 tsis tau qhia qhov kev tshem tawm PM1.0 siab vim tias nws qhov pores loj dua li Int-MN4.5.
Post lub sij hawm: Nov-03-2021
