Takulandirani kutsamba lathu kuti mudziwe zambiri zamalonda ndi kukambirana.
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Pepalali likuwunikira msika wamakono wa carbon pore, kusanthula mozama za zida za carbon activated, limayambitsa njira zowonetsera pore, njira zopangira, zomwe zimakhudza komanso momwe magwiritsidwe ntchito a carbon pore akuyendera, ndikuwunikanso zotsatira za kafukufuku waukadaulo wokhathamiritsa wa carbon pore, womwe umafuna kulimbikitsa mpweya wopangidwa kuti ugwire ntchito yobiriwira komanso yotsika kwambiri.
Kukonzekera kwa activated carbon
Nthawi zambiri, kukonzekera kwa carbon activated kugawidwa m'magawo awiri: carbonization ndi activation
Njira ya carbonization
Carbonization imatanthawuza njira yotenthetsera malasha aiwisi pa kutentha kwakukulu pansi pa chitetezo cha mpweya wa inert kuti uwononge zinthu zake zosakhazikika ndikupeza zinthu zapakati pa carbonized. The carbonization akhoza kukwaniritsa cholinga kuyembekezera ndi kusintha magawo ndondomeko. Kafukufuku wawonetsa kuti kutentha kwa activation ndi gawo lofunikira lomwe limakhudza zinthu za carbonization. Jie Qiang et al. anaphunzira zotsatira za carbonization Kutentha mlingo pa ntchito adamulowetsa mpweya mu ng'anjo muffle ndipo anapeza kuti mlingo wotsikirapo kumathandiza kuti zokolola za carbonized zipangizo ndi kupanga zipangizo apamwamba.
Njira yoyambitsa
Carbonization imatha kupanga zida zopangira ma microcrystalline mawonekedwe ofanana ndi graphite ndikupanga pore pore. Komabe, ma poreswa amasokonezeka kapena kutsekedwa ndi kutsekedwa ndi zinthu zina, zomwe zimapangitsa kuti pakhale malo ang'onoang'ono omwe amafunikira kuyambiranso. Kutsegula ndi njira yopititsira patsogolo mapangidwe a pore a mankhwala opangidwa ndi carbonized, omwe amachitidwa makamaka ndi zomwe zimachitika pakati pa activator ndi zopangira: zimatha kulimbikitsa mapangidwe a porous microcrystalline.
Kutsegula kumadutsa magawo atatu pakulemeretsa ma pores azinthu:
(1) Kutsegula ma pores oyambirira otsekedwa (kudzera pores);
(2) Kukulitsa pores choyambirira (kukulitsa pore);
(3) Kupanga pores atsopano (kupanga pore);
Zotsatira zitatuzi sizichitika zokha, koma zimachitika nthawi imodzi ndi synergistically. Nthawi zambiri, kudzera pores ndi pore chilengedwe ndi abwino kuonjezera chiwerengero cha pores, makamaka micropores, amene ndi opindulitsa pokonzekera zipangizo porous ndi mkulu porosity ndi lalikulu enieni pamwamba dera, pamene kwambiri pore kukula adzachititsa pores kuphatikiza ndi kugwirizana, akatembenuka micropores mu pores zikuluzikulu. Chifukwa chake, kuti mupeze zida za kaboni zokhala ndi pores otukuka komanso malo akulu enieni, ndikofunikira kupewa kuyambitsa kwambiri. Njira zogwiritsiridwa ntchito kwambiri zoyambitsa kaboni zimaphatikizapo njira yamankhwala, njira yakuthupi ndi njira ya physicochemical.
Chemical activation njira
Chemical activation njira imatanthawuza njira yowonjezerera ma reagents amankhwala kuzinthu zopangira, kenako ndikuwotcha poyambitsa mipweya yoteteza monga N2 ndi Ar mu ng'anjo yotenthetsera kuti carbonize ndikuyatsa nthawi yomweyo. Ma activators omwe amagwiritsidwa ntchito nthawi zambiri amakhala NaOH, KOH ndi H3P04. Njira yogwiritsira ntchito mankhwala imakhala ndi ubwino wa kutentha kochepa komanso zokolola zambiri, koma imakhalanso ndi mavuto monga dzimbiri lalikulu, zovuta kuchotsa zopangira pamwamba ndi kuwonongeka kwakukulu kwa chilengedwe.
Physical activation njira
Physical activation njira amatanthauza carbonizing zipangizo zopangira mwachindunji mu ng'anjo, ndiyeno anachita ndi mpweya monga CO2 ndi H20 anayambitsa pa kutentha kwambiri kukwaniritsa cholinga kuonjezera pores ndi kukulitsa pores, koma thupi kutsegula njira ali osauka controllability wa pore dongosolo. Pakati pawo, CO2 imagwiritsidwa ntchito kwambiri pokonza kaboni yolumikizidwa chifukwa ndi yoyera, yosavuta kupeza komanso yotsika mtengo. Ntchito carbonized kokonati chipolopolo ngati zopangira ndi adamulowetsa ndi CO2 kukonzekera adamulowetsa mpweya ndi micropores otukuka, ndi malo enieni pamwamba ndi okwana pore buku la 1653m2 · g-1 ndi 0.1045cm3 · g-1, motero. Ntchitoyi idafika pakugwiritsa ntchito kaboni wokhala ndi magawo awiri osanjikiza ma capacitor.
Yambitsani loquat mwala ndi CO2 kukonzekera wapamwamba adamulowetsa mpweya, pambuyo kutsegula pa 1100 ℃ kwa mphindi 30, malo enieni pamwamba ndi okwana pore voliyumu anafika ku 3500m2 · g-1 ndi 1.84cm3 · g-1, motero. Gwiritsani ntchito CO2 kuti mutsegulenso kaboni wa coconut activated carbon. Pambuyo kutsegula, ndi micropores wa mankhwala yomalizidwa anali yopapatiza, ndi micropore voliyumu chinawonjezeka kuchokera 0,21 cm3 · g-1 kuti 0,27 cm3 · g-1, yeniyeni pamwamba m'dera linawonjezeka kuchokera 627.22 m2 · g-1 kuti 822.71 m2 · g-1, ndi adsorption mphamvu ya phenol 237.
Akatswiri ena aphunzira zinthu zazikulu zowongolera za CO2 activation process. Mohammad et al. [21] anapeza kuti kutentha ndiye chinthu chachikulu chomwe chimapangitsa CO2 kugwiritsidwa ntchito kuyambitsa utuchi wa rabara. Malo enieni a pamwamba, pore voliyumu ndi microporosity ya mankhwala omalizidwa poyamba adawonjezeka ndiyeno kuchepa ndi kutentha kwakukulu. Cheng Song et al. [22] adagwiritsa ntchito njira yoyankhira pamwamba kuti afufuze njira ya CO2 yoyambitsa zipolopolo za mtedza wa macadamia. Zotsatira zake zidawonetsa kuti kutentha kwa activation ndi nthawi yotsegulira kumakhala ndi chikoka chachikulu pakukula kwa ma micropores opangidwa ndi kaboni.
Nthawi yotumiza: Aug-27-2024