Cellulose, polymer e ngata ka ho fetisisa lefatšeng, e etsa karolo e kholo ea biomass le lisebelisoa tse fapaneng tsa indasteri. Botšepehi ba eona bo tsotehang ba sebopeho bo baka mathata bakeng sa ho senyeha ha eona ka mokhoa o atlehileng, ho bohlokoa bakeng sa lits'ebetso tse kang tlhahiso ea biofuel le tsamaiso ea litšila. Hydrogen peroxide (H2O2) e hlahile e le mokhethoa ea ka bang teng bakeng sa ho qhibiliha ha selulose ka lebaka la tlhaho ea eona e ntle tikolohong le thepa ea oxidizing.
Selelekela:
Cellulose, polysaccharide e entsoeng ka liyuniti tsa tsoekere tse hokahantsoeng ke β-1,4-glycosidic bond, ke karolo e kholo ea sebopeho maboteng a lisele tsa semela. Bongata ba eona ho biomass bo e etsa sesebelisoa se khahlang liindasteri tse fapaneng, ho kenyeletsoa pampiri le makhasi, masela le bioenergy. Leha ho le joalo, marang-rang a matla a ho kopanya hydrogen ka har'a cellulose fibrils a etsa hore e se ke ea qhibiliha ka har'a lihlapolli tse ngata, e leng se bakang mathata bakeng sa tšebeliso ea eona e nepahetseng le ho e sebelisa hape.
Mekhoa e tloaelehileng ea ho qhibiliha ea selulose e kenyelletsa maemo a thata, joalo ka li-acid tse ngata kapa li-ionic liquid, tse atisang ho amahanngoa le mathata a tikoloho le tšebeliso e phahameng ea matla. Ka lehlakoreng le leng, hydrogen peroxide e fana ka mokhoa o mong o ts'episang ka lebaka la tlhaho ea eona e bonolo ea oxidizing le monyetla oa ho sebetsana le selulose e seng tikoloho. Pampiri ena e shebana le mekhoa ea ho qhibiliha ha selulose ea hydrogen peroxide-mediated le ho lekola ts'ebetso ea eona le ts'ebeliso e sebetsang.
Mekhoa ea ho qhibiliha ha cellulose ka Hydrogen Peroxide:
Ho qhibiliha ha selulose ka hydrogen peroxide ho kenyelletsa liphetoho tse rarahaneng tsa lik'hemik'hale, haholo-holo ho phunyeha ha oxidative ea glycosidic bond le ho senyeha ha intermolecular hydrogen bonding. Hangata, mokhoa ona o etsoa ka litsela tse latelang:
Oxidation of Hydroxyl Groups: Hydroxy peroxide e sebetsana le lihlopha tsa cellulose hydroxyl, e lebisang ho thehoeng ha hydroxyl radicals (•OH) ka Fenton kapa Fenton-like reactions boteng ba li-ion tsa tšepe tsa phetoho. Li-radicals tsena li hlasela li-bond tsa glycosidic, li qala ketane le ho hlahisa likhechana tse khutšoane tsa cellulose.
Ho senyeha ha Hydrogen Bonding: Li-radicals tsa Hydroxyl li boetse li senya marang-rang a hydrogen bonding pakeng tsa liketane tsa cellulose, ho fokolisa sebopeho sa kakaretso le ho nolofatsa tharollo.
Ho thehoa ha Li-Soluble Derivatives: Ho senyeha ha oxidative ea selulose ho fella ka ho thehoa ha li-intermediate tse qhibilihang metsing, tse kang carboxylic acid, aldehydes, le ketone. Lintho tsena tse nkiloeng li kenya letsoho ts'ebetsong ea ho qhibiliha ka ho eketsa ho qhibiliha le ho fokotsa viscosity.
Depolymerization le Fragmentation: Karabelo e eketsehileng ea oxidation le cleavage e lebisa ho depolymerization ea liketane tsa cellulose hore e be li-oligomers tse khuts'oane mme qetellong e be tsoekere e qhibilihang kapa lihlahisoa tse ling tse boima ba limolek'hule.
Lintlha tse Amang Phallo ea Hydrogen Peroxide-Mediated Cellulose:
Bokhoni ba ho qhibiliha ha cellulose ka hydrogen peroxide bo susumetsoa ke lintlha tse fapaneng, ho kenyelletsa:
Motsoako oa Hydrogen Peroxide: Maemo a phahameng a hydrogen peroxide hangata a fella ka lebelo la karabelo le ho senyeha ho hoholo ha selulose. Leha ho le joalo, ho tsepamisa maikutlo ho feteletseng ho ka lebisa litlamorao kapa lihlahisoa tse sa rateheng.
pH le Mocheso: PH ea mokhoa oa ho arabela e susumetsa tlhahiso ea li-radicals tsa hydroxyl le botsitso ba lihlahisoa tsa cellulose. Maemo a acidic a itekanetseng (pH 3-5) hangata a khethoa ho matlafatsa ho qhibiliha ha cellulose ntle le ho senyeha ho hoholo. Ho feta moo, mocheso o ama kinetics ea karabelo, 'me mocheso o phahameng hangata o potlakisa ts'ebetso ea ho qhibiliha.
Ho ba Teng ha Li-Catalysts: Li-ion tsa tšepe tsa phetoho, tse kang tšepe kapa koporo, li ka senya ho bola ha hydrogen peroxide le ho ntlafatsa sebopeho sa hydroxyl radicals. Leha ho le joalo, khetho ea catalyst le mahloriso a eona e tlameha ho ntlafatsoa ka hloko ho fokotsa karabelo ea lehlakore le ho netefatsa boleng ba sehlahisoa.
Cellulose Morphology and Crystallinity: Ho fumaneha ha liketane tsa cellulose ho hydrogen peroxide le hydroxyl radicals ho susumetsoa ke morphology ea thepa le sebopeho sa kristale. Libaka tsa Amorphous li kotsing ea ho senyeha ho feta libaka tse nang le kristale e ngata, e leng se hlokang mekhoa ea pele kapa ea ho fetola ho ntlafatsa ho fumaneha.
Melemo le Ts'ebeliso ea Hydrogen Peroxide ho Phallo ea Cellulose:
Hydrogen peroxide e fana ka melemo e mengata bakeng sa ho qhibiliha ha selulose ha ho bapisoa le mekhoa e tloaelehileng:
Tšebelisano ea Tikoloho: Ho fapana le lik'hemik'hale tse bohale tse kang sulfuric acid kapa lihlapolli tse chlorine, hydrogen peroxide e batla e le bobebe 'me e bola e be metsi le oksijene tlas'a maemo a bonolo. Tšobotsi ena ea botsoalle ea tikoloho e etsa hore e tšoanelehe bakeng sa ts'ebetso e tsitsitseng ea cellulose le tokiso ea litšila.
Maemo a Maikutlo a Bonolo: Ho qhibiliha ha selulose ea hydrogen peroxide-mediated ho ka etsoa tlas'a maemo a bonolo a mocheso le khatello, ho fokotsa tšebeliso ea matla le litšenyehelo tsa ts'ebetso ha ho bapisoa le mocheso o phahameng oa acid hydrolysis kapa phekolo ea metsi a ionic.
Khethollo ea Oxidation: The oxidative cleavage ea glycosidic bonds ka hydrogen peroxide e ka laoloa ho isa bohōleng bo itseng, ho lumella phetoho e khethiloeng ea liketane tsa cellulose le tlhahiso ea lihlahisoa tse entsoeng tse nang le thepa e itseng.
Lisebelisoa tse Fetang: Metsoako ea selulose e qhibilihang e fumanoeng ho qhibiliha ha hydrogen peroxide e ka sebelisoa mafapheng a fapaneng, ho kenyeletsoa tlhahiso ea biofuel, lisebelisoa tse sebetsang, lisebelisoa tsa biomedical, le ho hloekisa metsi a litšila.
Mathata le Litsela tsa Kamoso:
Ho sa tsotellehe litšobotsi tsa eona tse tšepisang, ho qhibiliha ha selulose ea hydrogen peroxide-mediated cellulose ho tobana le mathata a 'maloa le libaka tsa ntlafatso:
Khetho le Kotulo: Ho fumana chai e ngata ea lintho tse tsoang ho cellulose e qhibilihang ka mahlakoreng a fokolang e ntse e le phephetso, haholo-holo bakeng sa lihlahisoa tse rarahaneng tsa biomass tse nang le lignin le hemicellulose.
Kakaretso le Ts'ebetso ea Ts'ebetso: Ho phahamisa lits'ebetso tsa ho qhibiliha ha selulose e thehiloeng ho hydrogen peroxide ho isa maemong a indasteri ho hloka ho nahanoa ka hloko ka moralo oa reactor, ho hlaphoheloa ha solvent, le mehato ea ts'ebetso e tlase ho netefatsa ts'ebetso ea moruo le ho tšoarella ha tikoloho.
Nts'etsopele ea Catalyst: Moralo oa li-catalyst tse sebetsang hantle bakeng sa ts'ebetso ea hydrogen peroxide le cellulose oxidation ke ea bohlokoa bakeng sa ho matlafatsa sekhahla sa karabelo le khetho ha o ntse o fokotsa ho kenya li-catalyst le tlhahiso ea sehlahisoa.
Valorization of By-Products: Maano a ho matlafatsa lihlahisoa tse hlahisitsoeng nakong ea ho qhibiliha ha selulose ea hydrogen peroxide, joalo ka carboxylic acid kapa sukiri ea oligomeric, e ka ntlafatsa ts'ebetso le ts'ebetso ea moruo ka kakaretso.
Hydrogen peroxide e na le ts'episo e kholo ea ho ba sehlaseli se setala le se feto-fetohang bakeng sa ho qhibiliha ha selulose, se fanang ka melemo e kang ho lumellana ha tikoloho, maemo a bonolo a ho itšoara, le ho khetha oxidation. Leha ho na le liphephetso tse ntseng li tsoela pele, boiteko bo tsoelang pele ba lipatlisiso bo reretsoeng ho hlakisa mekhoa ea motheo, ho ntlafatsa maemo a karabelo, le ho hlahloba lits'ebetso tse ncha ho tla matlafatsa bokhoni le ts'ebetso ea ts'ebetso e thehiloeng ho hydrogen peroxide bakeng sa cellulose valorization.
Nako ea poso: Apr-10-2024