Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Izinto eziPhambili kunye nobuNjineli beMichiza, iYunivesithi yeSayensi kunye neTekhnoloji (UST), iDaejeon, i-34113 Republic yaseKorea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Izinto eziPhambili kunye nobuNjineli beMichiza, iYunivesithi yeSayensi kunye neTekhnoloji (UST), iDaejeon, i-34113 Republic yaseKorea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Izinto eziPhambili kunye nobuNjineli beMichiza, iYunivesithi yeSayensi kunye neTekhnoloji (UST), iDaejeon, i-34113 Republic yaseKorea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Izinto eziPhambili kunye nobuNjineli beMichiza, iYunivesithi yeSayensi kunye neTekhnoloji (UST), iDaejeon, i-34113 Republic yaseKorea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Izinto eziPhambili kunye nobuNjineli beMichiza, iYunivesithi yeSayensi kunye neTekhnoloji (UST), iDaejeon, i-34113 Republic yaseKorea
Korea Institute of Chemical Technology (KRICT) Biobased Chemistry Research Centre, Ulsan, 44429, Republic of Korea
Izinto eziPhambili kunye nobuNjineli beMichiza, iYunivesithi yeSayensi kunye neTekhnoloji (UST), iDaejeon, i-34113 Republic yaseKorea
Sebenzisa ikhonkco elingezantsi ukuze wabelane ngoguqulelo olupheleleyo lweli nqaku kunye nabahlobo bakho kunye noogxa bakho.Funda nzulu.
Ngenxa yobhubhani we-coronavirus kunye nemiba enxulumene ne-particle (PM) emoyeni, imfuno yeemaski ikhule ngokukhawuleza.Nangona kunjalo, izihlungi zemaski zemveli ezisekelwe kumbane omileyo kunye ne-nano sieve zonke ziyalahlwa, azinakonakala okanye ziphinde zisebenze, eziya kubangela iingxaki ezinkulu zenkunkuma.Ukongeza, eyokuqala iya kulahlekelwa ngumsebenzi wayo phantsi kweemeko ezifumileyo, ngelixa le yokugqibela iya kusebenza ngokuhla koxinzelelo lomoya okubalulekileyo kwaye i-pore clogging ngokukhawuleza iya kwenzeka.Apha, i-biodegradable, ubungqina bokufuma, ukuphefumla kakhulu, isihluzi semaski esisebenza kakhulu siphuhlisiwe.Ngokufutshane, iintsinga ezimbini ze-biodegradable ultrafine mats kunye ne-nanofiber mats zidityaniswe kwisihluzo se-membrane ye-Janus, emva koko yagqunywa nge-chitosan nanowhiskers ehlawuliswa ngokwe-cationically.Esi sihluzo sisebenza kakuhle njengesihluzo se-N95 sorhwebo kwaye sinokususa i-98.3% ye-2.5 µm PM.I-Nanofibers ikhusela ngokwasemzimbeni amasuntswana amahle, kunye neefibers ze-ultrafine zibonelela ngoxinzelelo oluphantsi lwe-59 Pa, olulungele ukuphefumla komntu.Ngokuchasene nokuhla okubukhali ekusebenzeni kwezihlungi ze-N95 zorhwebo xa zibonakaliswe kumswakama, ukulahleka kokusebenza kwesi sihluzo akunanto, ngoko ke ingasetyenziselwa amaxesha amaninzi ngenxa yokuba i-dipole esisigxina ye-chitosan adsorbs ultrafine PM (umzekelo, i-nitrogen).kunye neeoksidi zesulfure).Kubalulekile ukuba esi sihluzo sibole ngokupheleleyo kumhlaba ovundisiweyo kwiiveki ezi-4.
Ubhubhani we-coronavirus (COVID-19) ongazange ubonwe ngaphambili uqhuba imfuno enkulu yeemaski.[1] Umbutho wezeMpilo weHlabathi (i-WHO) uqikelela ukuba iimaski zonyango ezizigidi ezingama-89 ziyafuneka nyanga nganye kulo nyaka.[1] Ayipheleli nje ekufuneni iimaski ze-N95 ezikumgangatho ophezulu kuphela, kodwa iimaski zenjongo eqhelekileyo kubo bonke abantu ziye zaba sisixhobo esibalulekileyo semihla ngemihla ekuthinteleni esi sifo sisulelayo sokuphefumla.[1] Ukongeza, amasebe afanelekileyo acebisa ngamandla ukusetyenziswa kweemaski ezilahlwayo yonke imihla, [1] oku kukhokelele kwiingxaki zokusingqongileyo ezinxulumene nesixa esikhulu senkunkuma yemaski.
Kuba i-particulate matter (PM) ngoku iyeyona ngxaki iyingxaki yongcoliseko lomoya, iimaski ziye zaba zezona ndlela zisebenzayo zokumelana nezifumanekayo kumntu ngamnye.I-PM ihlulwe ibe yi-PM2.5 kunye ne-PM10 ngokobungakanani besuntswana (2.5 kunye ne-10μm ngokulandelanayo), echaphazela kakhulu indawo yendalo [2] kunye nomgangatho wobomi bomntu ngeendlela ezahlukeneyo.[2] Rhoqo ngonyaka, i-PM ibangela ukufa kwezigidi ezi-4.2 kunye ne-103.1 yezigidi zokukhubazeka ezihlengahlengisiweyo zeminyaka yobomi.[2] I-PM2.5 ibeka isoyikiso esibi kakhulu kwimpilo kwaye yonyulwa ngokusemthethweni njengeqela I carcinogen.[2] Ngoko ke, kufike ngexesha kwaye kubalulekile ukuphanda kunye nokuphuhlisa isihluzo semaski esisebenzayo ngokwemiqathango yokungena komoya kunye nokususwa kwe-PM.[3]
Ngokuqhelekileyo, izihluzi zefiber zemveli zibamba i-PM ngeendlela ezimbini ezahlukeneyo: ngokusebenzisa i-sieving yomzimba esekelwe kwi-nanofibers kunye ne-electrostatic adsorption esekelwe kwii-microfibers (Figure 1a).Ukusetyenziswa kweefilitha ezisekelwe kwi-nanofiber, ngokukodwa i-electrospun nanofiber mats, ibonakalise isicwangciso esisebenzayo sokususa i-PM, okuyisiphumo sokufumaneka kwezinto ezininzi kunye nesakhiwo semveliso esilawulekayo.[3] I-nanofiber mat inokususa amaqhekeza obungakanani obujoliswe kuyo, obubangelwa ukwahlukana kobukhulu phakathi kweengqungquthela kunye neepores.[3] Nangona kunjalo, iintsinga ze-nano-scale kufuneka zipakishwe ngokuxineneyo ukuze zenze imingxunya emincinci kakhulu, eyingozi ekuphefumleni komntu ngenxa yomohluko woxinzelelo oluphezulu olunxulumeneyo.Ukongeza, imingxuma emincinci ngokuqinisekileyo iya kuvalwa ngokukhawuleza.
Kwelinye icala, i-meltblown ultra-fine fiber mat ihlawuliswa nge-electrostatically yintsimi yombane enamandla kakhulu, kwaye amasuntswana amancinci kakhulu abanjwe yi-electrostatic adsorption.[4] Njengomzekelo omeleyo, i-N95 yokuphefumula i-particle-filtering face-mask respirator ehlangabezana neemfuno zeNational Institute of Occupational Safety and Health kuba inokucoca ubuncinane i-95% yeengqungquthela zomoya.Olu hlobo lwesihluzi lufunxa i-ultrafine PM, edla ngokuqulunqwa zizinto ze-anionic ezifana ne-SO42− kunye ne-NO3−, ngomtsalane onamandla we-electrostatic.Nangona kunjalo, intlawulo engatshintshiyo kumphezulu we-fiber mat ichithwa ngokulula kwindawo efumileyo, efana nokufunyanwa kukuphefumula komntu okufumileyo, [4] okukhokelela ekunciphiseni umthamo we-adsorption.
Ukuze kuphuculwe ngakumbi ukusebenza kokucoca okanye ukusombulula ukurhweba phakathi kokusebenza kokususa kunye nokunciphisa uxinzelelo, izihlungi ezisekelwe kwi-nanofibers kunye ne-microfibers zidibene nezinto eziphezulu ze-k, ezifana ne-carbon materials, i-metal organic frameworks, kunye ne-PTFE nanoparticles.[4] Nangona kunjalo, ityhefu yebhayoloji engaqinisekanga kunye nokuchithwa kwentlawulo kwezi zongezo kuseyingxaki engenakuthintelwa.[4] Ngokukodwa, ezi ntlobo zimbini zezihluzi zemveli ziqhele ukungonakali, ngoko ke ekugqibeleni ziya kungcwatywa kwiindawo zokulahla inkunkuma okanye zitshiswe emva kokusetyenziswa.Ke ngoko, uphuhliso lwezihluzi zemaski eziphuculweyo zokusombulula ezi ngxaki zenkunkuma kwaye kwangaxeshanye ubambe i-PM ngendlela eyanelisayo nenamandla yimfuneko ebalulekileyo ngoku.
Ukuze sisombulule ezi ngxaki zingasentla, siye savelisa i-Janus membrane filter ehlanganiswe ne-poly(butylene succinate)-based (PBS-based) [5] i-microfiber kunye ne-nanofiber mats.Isihluzo se-membrane ye-Janus siqatywe nge-chitosan nano whiskers (CsWs) [5] (Figure 1b).Njengoko sonke sisazi, i-PBS ngummeli wepolymer enokubola, enokuvelisa i-ultrafine fiber kunye ne-nanofiber nonwovens ngokusebenzisa i-electrospinning.I-Nano-scale fibers ibamba i-PM ngokomzimba, ngelixa i-micro-scale nano-fibers inciphisa uxinzelelo kwaye isebenze njengesakhelo se-CSW.I-Chitosan yimathiriyeli esekwe kwibhayoloji engqinwe ukuba ineempawu ezilungileyo zebhayoloji, kubandakanya nokuhambelana kwebhayoloji, ukubola kwezinto eziphilayo kunye netyhefu ephantsi ngokwentelekiso, [5] enokunciphisa ixhala elinxulumene nokuphefumla ngempazamo kwabasebenzisi.[5] Ukongeza, i-chitosan ineendawo ze-cationic kunye namaqela e-polar amide.[5] Naphantsi kweemeko zomswakama, inokutsala amasuntswana e-polar ultrafine (afana ne-SO42- kunye ne-NO3-).
Apha, sixela isihluzi semaski esinokuguquguquka, ukusebenza okuphezulu, ubungqina bokufuma kunye noxinzelelo oluphantsi lokucoca imaski esekwe kwizinto ezifumaneka lula.Ngenxa yokudityaniswa kwe-sieving yomzimba kunye ne-electrostatic adsorption, i-CSW-coated microfiber/nanofiber edibeneyo yokucoca ine-PM2.5 ephezulu yokususa ukusebenza kakuhle (ukuya kuma-98%), kwaye kwangaxeshanye, ukuhla koxinzelelo olukhulu kwi-filter engqingqwa. kuphela Yi-59 Pa, ilungele ukuphefumla komntu.Xa kuthelekiswa nokuthotywa kokusebenza okubalulekileyo okubonakaliswe sisihluzo sorhwebo se-N95, esi sihluzo sibonisa ilahleko engabalulekanga yokususa i-PM (<1%) nokuba imanzi ngokupheleleyo, ngenxa yentlawulo esisigxina ye-CSW.Ukongeza, izihluzi zethu ziyakwazi ukubola ngokupheleleyo kumhlaba ovundisiweyo kwiiveki ezi-4.Xa kuthelekiswa namanye amaphononongo aneengcamango ezifanayo, apho inxalenye yokucoca iqulunqwe ngezinto eziguquguqukayo, okanye ibonisa ukusebenza okulinganiselweyo kwizicelo ezinokuthi zenzeke kwi-biopolymer nonwoven, [6] esi sihluzo sibonisa ngokuthe ngqo i-Biodegradability yeempawu eziphambili (i-movie S1, ulwazi oluxhasayo).
Njengenxalenye yesihluzo se-membrane ye-Janus, iimethi ze-nanofiber kunye ne-superfine fiber PBS zalungiswa kuqala.Ngoko ke, i-11% kunye ne-12% yezisombululo ze-PBS zaziyi-electrospun ukuvelisa i-nanometer kunye ne-micrometer fibers, ngokulandelanayo, ngenxa yokwahlukana kwabo kwi-viscosity.[7] Ulwazi olucacileyo lweempawu zesisombululo kunye neemeko ezifanelekileyo ze-electrospinning zidweliswe kwiiTables S1 kunye ne-S2, kwiinkcukacha ezixhasayo.Ekubeni i-fiber as-spun iqulethe i-solvent eseleyo, ibhafu eyongezelelweyo yokudibanisa amanzi yongezwa kwisixhobo esiqhelekileyo se-electrospinning, njengoko kubonisiwe kuMfanekiso 2a.Ukongezelela, ukuhlamba kwamanzi kunokusebenzisa isakhelo ukuqokelela i-coagulated pure PBS fiber mat, eyahlukileyo kwi-matrix eqinile kwisimo sendabuko (Umfanekiso 2b).[7] I-avareji ye-fiber diameters ye-microfiber kunye ne-nanofiber mats yi-2.25 kunye ne-0.51 µm, ngokulandelelana, kunye ne-avareji ye-pore diameters yi-13.1 kunye ne-3.5 µm, ngokulandelanayo (Figure 2c, d).Njengoko i-9: 1 i-chloroform / i-ethanol solvent iphuphuma ngokukhawuleza emva kokukhululwa kwi-nozzle, umehluko we-viscosity phakathi kwe-11 kunye ne-12 wt% yezisombululo zanda ngokukhawuleza (Umfanekiso S1, ulwazi oluxhasayo).[7] Ngoko ke, ukuhlukana koxinzelelo lwe-1 wt% kuphela kunokubangela utshintsho oluphawulekayo kwi-fiber diameter.
Ngaphambi kokujonga ukusebenza kokucoca (Umfanekiso we-S2, ulwazi oluxhasayo), ukuze uthelekise izihluzi ezahlukeneyo ngokufanelekileyo, i-electrospun nonwovens yobukhulu obuqhelekileyo yenziwa, kuba ubukhulu buyinto ebalulekileyo echaphazela ukuhluka koxinzelelo kunye nokusebenza kakuhle kokucoca kwentsebenzo yokucoca.Ekubeni i-nonwovens ithambile kwaye i-porous, kunzima ukucacisa ngokuthe ngqo ubukhulu be-electrospun nonwovens.Ubukhulu belaphu ngokuqhelekileyo buhambelana nobuninzi bomhlaba (ubunzima beyunithi yendawo, ubunzima besiseko).Ke ngoko, kolu phononongo, sisebenzisa ubunzima besiseko (gm-2) njengomlinganiselo osebenzayo wobunzima.[8] Ubunzima bulawulwa ngokutshintsha ixesha le-electrospinning, njengoko kuboniswe kuMfanekiso 2e.Njengoko ixesha lokujikeleza landa ukusuka kwi-1 iminithi ukuya kwi-10 imizuzu, ubukhulu be-microfiber mat buyanda ukuya kwi-0.2, 2.0, 5.2, kunye ne-9.1 gm-2, ngokulandelanayo.Ngendlela efanayo, ubukhulu be-nanofiber mat bonyuswe kwi-0.2, 1.0, 2.5, kunye ne-4.8 gm-2, ngokulandelanayo.I-Microfiber kunye neemethi ze-nanofiber zichongwe ngamaxabiso azo obunzima (gm-2) njenge: M0.2, M2.0, M5.2 kunye ne-M9.1, kunye ne-N0.2, N1.0, N2.5 kunye ne-N4. 8.
Umahluko woxinzelelo lomoya (ΔP) wesampulu yonke luphawu olubalulekileyo lomsebenzi wokucoca.[9] Ukuphefumla ngesihluzi esinoxinzelelo oluphezulu loxinzelelo alukhululeki kumsebenzisi.Ngokwemvelo, kubonwa ukuba ukunyuka koxinzelelo kuyanda njengoko ubukhulu bokucoca kukhula, njengoko kuboniswe kuMzobo S3, ulwazi oluxhasayo.I-nanofiber mat (i-N4.8) ibonisa ukuhla koxinzelelo oluphezulu kune-microfiber (M5.2) i-mat kwi-thickness ethelekisayo ngenxa yokuba i-nanofiber mat ineepores ezincinci.Njengoko umoya udlula kwisihluzi ngesantya phakathi kwe-0.5 kunye ne-13.2 ms-1, ukuhla koxinzelelo lweentlobo ezimbini ezahlukeneyo zokucoca ngokuthe ngcembe kwanda ukusuka kwi-101 Pa ukuya kwi-102 Pa. Ubukhulu kufuneka buphuculwe ukulinganisela ukuhla koxinzelelo kunye nokususwa kwe-PM. ukusebenza kakuhle;isantya somoya esiyi-1.0 ms-1 sifanelekile kuba ixesha elithathwa ngabantu ukuphefumla ngomlomo limalunga ne-1.3 ms-1.[10] Kule nkalo, uxinzelelo lwe-M5.2 kunye ne-N4.8 luyamkeleka kwi-air velocity ye-1.0 ms-1 (ngaphantsi kwe-50 Pa) (Umfanekiso we-S4, ulwazi oluxhasayo).Nceda uqaphele ukuba ukuhla koxinzelelo lwe-N95 kunye nemigangatho efanayo yokucoca i-Korean (KF94) imaski yi-50 ukuya kwi-70 Pa, ngokulandelanayo.Ukuqhubela phambili ukuqhutyelwa kwe-CSW kunye ne-micro / nano filter integration inokunyusa ukumelana nomoya;ngoko ke, ukwenzela ukubonelela ngoxinzelelo lwe-drop margin, sihlalutye i-N2.5 kunye ne-M2.0 ngaphambi kokuhlalutya i-M5.2 kunye ne-N4.8.
Kwisantya somoya esijoliswe kuyo se-1.0 ms-1, ukususwa kakuhle kwe-PM1.0, PM2.5, kunye ne-PM10 ye-PBS microfiber kunye ne-nanofiber mats yafundwa ngaphandle kwentlawulo ye-static (Umfanekiso we-S5, ulwazi oluxhasayo).Kuyaqatshelwa ukuba ukususwa kwe-PM ngokufanelekileyo konyuka ngokubanzi ngokunyuka kobukhulu kunye nobukhulu be-PM.Ukusebenza kakuhle kokususa i-N2.5 kungcono kune-M2.0 ngenxa yeepores zayo ezincinci.Ukuphumelela kokususa i-M2.0 ye-PM1.0, i-PM2.5 kunye ne-PM10 yayiyi-55.5%, i-64.6% kunye ne-78.8%, ngokulandelanayo, ngelixa amaxabiso afanayo e-N2.5 ayengama-71.9%, 80.1% kunye ne-89.6% (Figure). 2f).Siqaphele ukuba umahluko omkhulu ekusebenzeni kakuhle phakathi kwe-M2.0 kunye ne-N2.5 yi-PM1.0, ebonisa ukuba ukuhluthwa ngokomzimba kwe-microfiber mesh kusebenza kakuhle kwi-PM yezinga le-micron, kodwa ayisebenzi kwi-nano-level PM (Figure S6, ulwazi oluxhasayo)., i-M2.0 kunye ne-N2.5 zombini ibonisa amandla aphantsi wokubamba i-PM angaphantsi kwe-90%.Ukongeza, i-N2.5 inokuthi ichaphazeleke ngakumbi kuthuli kune-M2.0, kuba iincinci zothuli zingakwazi ukuvimba ngokulula iipores ezincinci ze-N2.5.Ukungabikho kwentlawulo ye-static, ukuhluthwa ngokomzimba kunqunyelwe ekukwazini ukufezekisa ukuhla koxinzelelo olufunekayo kunye nokusebenza kakuhle kokususa ngexesha elifanayo ngenxa yobudlelwane borhwebo phakathi kwabo.
I-electrostatic adsorption yeyona ndlela isetyenziswa kakhulu yokubamba i-PM ngendlela esebenzayo.[11] Ngokuqhelekileyo, intlawulo ye-static ifakwe ngenkani kwisihluzo esingalukwanga ngokusebenzisa intsimi yombane ephezulu;nangona kunjalo, le ntlawulo ye-static ichithwa ngokulula phantsi kweemeko zokufuma, okukhokelela ekulahlekelweni kwekhono lokubamba i-PM.[4] Njengezinto ezisekelwe kubomi bokucoca i-electrostatic, sazisa i-200 nm ubude kunye ne-40 nm ububanzi beCsW;ngenxa yamaqela abo ammonium kunye namaqela polar amide, ezi nanowhiskers ziqulathe iintlawulo ezisisigxina cationic.Intlawulo ekhoyo ekhoyo kumphezulu we-CsW imelwe ngamandla ayo e-zeta (ZP);I-CsW ihlakazekile emanzini nge-pH ye-4.8, kwaye i-ZP yabo ifunyenwe + 49.8 mV (Umfanekiso S7, ulwazi oluxhasayo).
I-CsW-coated PBS microfibers (i-ChMs) kunye ne-nanofibers (i-ChNs) zalungiswa nge-coating ye-dip elula kwi-0.2 wt% i-CsW yokusasazeka kwamanzi, eyona ingqwalasela efanelekileyo yokufaka ubuninzi be-CsWs kumphezulu we-PBS fibers, njengoko kubonisiwe kwi umfanekiso oboniswe kuMfanekiso 3a kunye noMzobo S8, ulwazi oluxhasayo.Umfanekiso we-X-ray we-nitrogen wamandla osasaza i-X-ray ubonisa ukuba umphezulu we-PBS fiber ugqunywe ngokufanayo ngamasuntswana e-CsW, ebonakala nakumfanekiso we-electron microscope (SEM) yokuskena (Umfanekiso 3b; Umzobo S9, ulwazi oluxhasayo) .Ukongeza, oku Le ndlela yokugquma yenza ukuba i-nanomaterials ehlawulisiweyo idibanise kakuhle i-fiber surface, ngaloo ndlela ikhulise amandla okususa i-electrostatic PM (Umfanekiso S10, ulwazi oluxhasayo).
Ukusebenza kakuhle kokususa i-PM ye-ChM kunye ne-ChN kwafundwa (Umfanekiso 3c).I-M2.0 kunye ne-N2.5 zifakwe kwi-CSW ukuvelisa i-ChM2.0 kunye ne-ChN2.5, ngokulandelanayo.Ukuphumelela kokususa i-ChM2.0 ye-PM1.0, i-PM2.5 kunye ne-PM10 yayiyi-70.1%, i-78.8% kunye ne-86.3%, ngokulandelanayo, ngelixa amaxabiso afanayo e-ChN2.5 ayengama-77.0%, 87.7% kunye ne-94.6% ngokulandelanayo.I-coating ye-CsW iphucula kakhulu ukusebenza kakuhle kokususa kwe-M2.0 kunye ne-N2.5, kwaye umphumo ojongwe kwi-PM encinci ibaluleke kakhulu.Ngokukodwa, i-chitosan nanowhiskers yandise ukusebenza kakuhle kokususwa kwe-M2.0's PM0.5 kunye ne-PM1.0 nge-15% kunye ne-13%, ngokulandelanayo (Umfanekiso S11, ulwazi oluxhasayo).Nangona i-M2.0 kunzima ukungabandakanyi i-PM1.0 encinci ngenxa yobubanzi be-fibril spacing (Figure 2c), i-ChM2.0 ibhengeza i-PM1.0 ngenxa yokuba i-cations kunye ne-amides kwii-CsWs zidlula kwi-ion-ion, idibanisa i-Pole-ion interaction. , kunye nentsebenziswano ye-dipole-dipole nothuli.Ngenxa yokugquma kwayo kwe-CSW, i-PM yokususa ukusebenza kakuhle kwe-ChM2.0 kunye ne-ChN2.5 iphezulu njengaleyo ye-M5.2 kunye ne-N4.8 ebanzi (Itheyibhile S3, ulwazi oluxhasayo).
Okubangela umdla kukuba, nangona ukususwa kwe-PM kuphuculwe kakhulu, ukugquma kwe-CSW akuchaphazeli ukuhla koxinzelelo.Ukuhla koxinzelelo lwe-ChM2.0 kunye ne-ChN2.5 kwanda kancinci ukuya kwi-15 kunye ne-23 Pa, phantse isiqingatha sokunyuka okuphawulwe kwi-M5.2 kunye ne-N4.8 (Umfanekiso 3d; I-Table S3, ulwazi oluxhasayo).Ngoko ke, ukugquma ngezinto ezisekelwe kwi-bio yindlela efanelekileyo yokuhlangabezana neemfuno zokusebenza kweefilitha ezimbini ezisisiseko;oko kukuthi, ukusebenza kakuhle kokususwa kwe-PM kunye nokwahlukana koxinzelelo lomoya, ezihambelanayo.Nangona kunjalo, ukusebenza kakuhle kwe-PM1.0 kunye ne-PM2.5 kwe-ChM2.0 kunye ne-ChN2.5 zombini zingaphantsi kwe-90%;ngokucacileyo, lo msebenzi kufuneka uphuculwe.
Inkqubo yokuhluza edibeneyo eyenziwe ngeembrane ezininzi kunye nokutshintsha ngokuthe ngcembe i-fiber diameters kunye nobukhulu bepore inokusombulula ezi ngxaki zingentla [12].Isihluzi somoya esidityanisiweyo sineenzuzo zeenanofibers ezimbini ezahlukeneyo kunye nenetha yefiber egqwesileyo.Kulo mba, i-ChM kunye ne-ChN zifakwe ngokulula ukuvelisa izihlungi ezidibeneyo (Int-MNs).Ngokomzekelo, i-Int-MN4.5 ilungiselelwe kusetyenziswa i-ChM2.0 kunye ne-ChN2.5, kwaye ukusebenza kwayo kuthelekiswa ne-ChN4.8 kunye ne-ChM5.2 ezinobunzima bendawo efanayo (okt ubukhulu).Kuvavanyo olusebenzayo lokususa i-PM, i-ultrafine fiber side ye-Int-MN4.5 yavezwa kwigumbi elinothuli ngenxa yokuba i-ultrafine fiber side yayixhathisa ukuvala kune-nanofiber side.Njengoko kuboniswe kwi-Figure 4a, i-Int-MN4.5 ibonisa ukusebenza kakuhle kokususwa kwe-PM kunye nokuhluka koxinzelelo kunezihlungi ezimbini zecandelo elilodwa, kunye nokuhla kwengcinezelo ye-37 Pa, efana ne-ChM5.2 kwaye iphantsi kakhulu kune-ChM5.2 ChN4.8. Ukongeza, ukusebenza kakuhle kokususa i-PM1.0 kwe-Int-MN4.5 yi-91% (Figure 4b).Ngakolunye uhlangothi, i-ChM5.2 ayizange ibonise ukukhutshwa okuphezulu kwe-PM1.0 ngenxa yokuba iipores zayo zikhulu kunezo ze-Int-MN4.5.
Ixesha lokuposa: Nov-03-2021
