Ko te waro whakahohe (AC) e pā ana ki ngā rauemi waro nui he nui te porosity me te kaha mimiti i hangaia mai i te rakau, te anga kokonati, te waro, me ngā koeko, me ētahi atu. Ko te AC tētahi o ngā adsorbents e whakamahia ana i roto i ngā ahumahi maha hei tango i ngā poke maha mai i ngā tinana wai me te hau. Mai i te mea i hangaia te AC mai i ngā hua ahuwhenua me ngā hua para, kua kitea he huarahi pai hei whakakapi i ngā puna kore-whakahou me te utu nui i whakamahia i mua. Mō te whakarite i te AC, e rua ngā tukanga matua e whakamahia ana, ko te waro me te whakahohenga. I te tukanga tuatahi, ka tukuna ngā precursors ki ngā pāmahana teitei, i waenga i te 400 me te 850°C, hei pana i ngā wāhanga pūngāwerewere katoa. Ka tangohia e te pāmahana teitei ngā wāhanga kore-waro katoa mai i te precursors pērā i te hauwai, te hāora, me te hauota i roto i te ahua o ngā hau me ngā tā. Ka puta he waro nui i roto i tēnei tukanga engari he iti te horahanga mata me te porosity. Heoi, ko te taahiraa tuarua ko te whakahohe i te waro i hangaia i mua. Ka taea te wehewehe i te whakanui ake i te rahi o ngā pore i te wā o te tukanga whakahohenga kia toru: te whakatuwheratanga o ngā pore kāore i taea te uru atu i mua, te whanaketanga o ngā pore hou mā te whakahohenga whiriwhiri, me te whānui o ngā pore o mua.
I te nuinga o te wā, e rua ngā huarahi e whakamahia ana, arā, te āhua ā-tinana me te āhua matū, hei whakahohe kia whiwhi ai i te horahanga mata me te pūngao e hiahiatia ana. Ko te whakahohenga ā-tinana ko te whakahohenga o te waro waro mā te whakamahi i ngā hau whakapūngao pērā i te hau, te hauhā waro, me te mamaoa i ngā pāmahana teitei (i waenga i te 650 me te 900°C). Ko te hauhā waro te mea e pai ake ana nā tōna āhua parakore, te ngāwari o te whakahaere, me te tukanga whakahohenga ka taea te whakahaere i te 800°C. Ka taea te whiwhi i te ōritetanga o ngā pūngao teitei mā te whakahohenga o te hauhā waro ki te whakarite ki te mamaoa. Heoi, mō te whakahohenga ā-tinana, he pai ake te mamaoa ki te whakarite ki te hauhā waro nā te mea ka taea te whakaputa i te AC me te horahanga mata teitei. Nā te iti o te rahi o te ngota ngota o te wai, ka puta pai tōna horapa i roto i te hanganga o te waro. Kua kitea ko te whakahohenga mā te mamaoa e rua ki te toru ngā wā teitei ake i te hauhā waro me te rite tonu te nui o te huringa.
Heoi, ko te huarahi matū ko te whakaranu i te matū mua me ngā matū whakahohe (NaOH, KOH, me te FeCl3, me ētahi atu). Ka mahi ēnei matū whakahohe hei kaiwhakaora me hei whakamaroke hoki. I tēnei huarahi, ka mahia te whakapūngao waro me te whakahohenga i te wā kotahi i te pāmahana iti iho i te 300-500°C ki te whakataurite ki te huarahi ā-tinana. Nō reira, ka pā ki te pirau pyrolytic, ā, ka hua ake he whānui ake o te hanganga porous me te hua waro nui. Ko ngā painga nui o te matū i runga i te huarahi ā-tinana ko te iti o te pāmahana e hiahiatia ana, ngā hanganga microporosity teitei, te horahanga mata nui, me te wā whakaoti tauhohenga poto.
Ka taea te whakamārama i te hiranga o te tikanga whakahohenga matū i runga i te tauira i whakatakotoria e Kim me āna hoa mahi [1] e ai ki te tauira i whakatakotoria e Kim me āna hoa mahi [1] e kitea ana ngā momo rohe moroiti porowhita e kawenga ana mō te hanganga o ngā pore moroiti i roto i te AC. I tētahi atu taha, ka whakawhanakehia ngā mesopore i roto i ngā rohe intermicrodomain. I roto i ngā whakamātautau, i hangaia e rātou he waro whakahohe mai i te kapia i ahu mai i te phenol mā te whakahohenga matū (mā te whakamahi i te KOH) me te whakahohenga ā-tinana (mā te whakamahi i te mamaoa) (Pikitia 1). I whakaatuhia e ngā hua he nui te horahanga mata o te AC i hangaia mā te whakahohenga KOH, arā, 2878 m2/g, ki te whakaritea ki te 2213 m2/g mā te whakahohenga mamaoa. Hei tāpiri, i kitea he pai ake ētahi atu āhuatanga pēnei i te rahi o te pore, te horahanga mata, te rahinga o te pore moroiti, me te whānui toharite o te pore i roto i ngā āhuatanga whakahohenga KOH ki te whakaritea ki te whakahohenga mamaoa.
Ko ngā rerekētanga i waenga i te AC i whakaritea mai i te whakahohenga mamaoa (C6S9) me te whakahohenga KOH (C6K9), ia, e whakamāramahia ana i runga i te tauira hanganga moroiti.
I runga i te rahi o te matūriki me te tikanga whakarite, ka taea te whakarōpū kia toru ngā momo: AC hiko, AC kirikiri, me te AC pītiti. Ka hangaia te AC hiko mai i ngā pītiti angiangi he 1 mm te rahi me te whānuitanga toharite o te 0.15-0.25 mm. He nui ake te rahi o te AC kirikiri, ā, he iti ake te horahanga o te mata o waho. Ka whakamahia te AC kirikiri mō ngā tono āhua wai me te āhua hau i runga i ō rātou ōwehenga rahi. Akomanga tuatoru: AC pītiti ka hangaia i te nuinga o te wā mai i te papa hinu me te diameter mai i te 0.35 ki te 0.8 mm. E mōhiotia ana mō tōna kaha miihini teitei me te iti o te puehu. He whānui te whakamahinga i roto i ngā tono moenga wai pērā i te tātari wai nā tōna hanganga porowhita.
Wā tuku: Pipiri-18-2022