Njira yogwiritsira ntchito kaboni woyatsidwa nthawi zambiri imakhala ndi kaboni woyatsidwa kenako ndi kuyambitsa zinthu za kaboni kuchokera ku zomera. Kupaka kaboni ndi njira yotenthetsera pa 400-800°C yomwe imasintha zinthu zopangira kukhala kaboni mwa kuchepetsa kuchuluka kwa zinthu zosinthasintha ndikuwonjezera kuchuluka kwa kaboni m'zinthuzo. Izi zimawonjezera mphamvu ya zinthuzo ndikupanga kapangidwe koyambira ka maporous komwe ndikofunikira ngati kaboni ikuyatsidwa. Kusintha momwe kaboni imagwirira ntchito kungakhudze kwambiri chinthu chomaliza. Kutentha kowonjezereka kwa kaboni kumawonjezera reactivity, koma nthawi yomweyo kumachepetsa kuchuluka kwa mapores omwe alipo. Kuchepa kwa kuchuluka kwa mapores kumeneku kumachitika chifukwa cha kuwonjezeka kwa kuzizira kwa zinthuzo kutentha kwakukulu kwa kaboni komwe kumapangitsa kuti mphamvu yamakina iwonjezereke. Chifukwa chake, ndikofunikira kusankha kutentha koyenera kutengera zomwe mukufuna kuchokera ku kaboni.
Ma oxide amenewa amatuluka mu kaboni zomwe zimapangitsa kuti mpweya utuluke pang'ono womwe umatsegula ma pores omwe adatsekedwa kale ndikukulitsa kapangidwe ka ma carbon mkati mwake. Poyambitsa mankhwala, kaboni imayankhidwa kutentha kwambiri ndi chinthu chochotsa madzi m'thupi chomwe chimachotsa haidrojeni ndi mpweya wambiri kuchokera mu kapangidwe ka kaboni. Kuyambitsa mankhwala nthawi zambiri kumaphatikiza gawo la carbonization ndi activation, koma magawo awiriwa amatha kuchitika padera kutengera momwe zinthu zilili. Malo okwera opitilira 3,000 m2 / g apezeka pogwiritsa ntchito KOH ngati chinthu choyambitsa mankhwala.
Mpweya Wopangidwa ndi Zinthu Zosiyanasiyana.
Kuwonjezera pa kukhala chokometsera mpweya chomwe chimagwiritsidwa ntchito pazinthu zosiyanasiyana, mpweya woyatsidwa umatha kupangidwa kuchokera ku zinthu zosiyanasiyana, zomwe zimapangitsa kuti ukhale chinthu chosiyanasiyana chomwe chingapangidwe m'malo osiyanasiyana kutengera ndi zinthu zopangira zomwe zilipo. Zina mwa zinthuzi ndi monga zipolopolo za zomera, miyala ya zipatso, zinthu zamatabwa, phula, ma carbide achitsulo, kaboni wakuda, zinyalala zochokera ku zimbudzi, ndi zidutswa za polima. Mitundu yosiyanasiyana ya malasha, yomwe ilipo kale mu mawonekedwe a 5 carbonaceous yokhala ndi kapangidwe ka ma pore opangidwa, imatha kukonzedwanso kuti ipange mpweya woyatsidwa. Ngakhale mpweya woyatsidwa umatha kupangidwa kuchokera kuzinthu zilizonse zopangira, ndikotsika mtengo kwambiri komanso kosamala chilengedwe kupanga mpweya woyatsidwa kuchokera ku zinthu zotayira. Ma carbon oyatsidwa opangidwa kuchokera ku zipolopolo za kokonati awonetsedwa kuti ali ndi ma micropores ambiri, zomwe zimapangitsa kuti akhale zinthu zopangira zomwe zimagwiritsidwa ntchito kwambiri pakugwiritsa ntchito komwe kumafunika mphamvu yayikulu yoyamwa. Udzu ndi zinthu zina zamatabwa zimakhalanso ndi mapangidwe amphamvu a microporous omwe ndi abwino poyamwa kuchokera ku gawo la mpweya. Kupanga mpweya wopangidwa kuchokera ku miyala ya azitona, plamu, apurikoti, ndi pichesi kumabweretsa zinthu zofanana kwambiri zomwe zimakhala zolimba kwambiri, zotsutsana ndi kukwawa komanso kuchuluka kwa micropore. Zidutswa za PVC zimatha kuyatsidwa ngati HCl yachotsedwa kale, ndipo zimapangitsa kuti mpweya wopangidwa ukhale wabwino kwambiri womwe umakhala wabwino kwambiri kwa methylene blue. Ma carbon opangidwanso amapangidwanso kuchokera ku zidutswa za matayala. Pofuna kusiyanitsa mitundu yosiyanasiyana ya zinthu zomwe zingatheke, kumakhala kofunikira kuwunika momwe zinthuzo zimakhalira pambuyo poyatsa. Posankha choyambira, zinthu zotsatirazi ndizofunikira: malo enieni a pores, kuchuluka kwa pores ndi kuchuluka kwa pores, kapangidwe ndi kukula kwa granules, ndi kapangidwe ka mankhwala/khalidwe la pamwamba pa carbon.
Kusankha choyambira choyenera kuti chigwiritsidwe ntchito moyenera ndikofunikira kwambiri chifukwa kusintha kwa zinthu zoyambira kumathandiza kuwongolera kapangidwe ka ma pore a carbon. Ma precursor osiyanasiyana ali ndi kuchuluka kosiyanasiyana kwa ma macropores (> 50 nm,) komwe kumatsimikiza momwe amagwirira ntchito. Ma macropores awa sagwira ntchito poyambitsa, koma kupezeka kwawo kumalola njira zambiri zopangira ma micropores panthawi yoyambitsa. Kuphatikiza apo, ma macropores amapereka njira zambiri kuti mamolekyu a adsorbate afikire ma micropores panthawi yoyambitsa.
Nthawi yotumizira: Epulo-01-2022