Ke reagent efe e qhibilihang cellulose?

Cellulose ke polysaccharide e rarahaneng e entsoeng ka li-unit tse ngata tsa tsoekere tse hokahantsoeng ke β-1,4-glycosidic bond.Ke karolo e ka sehloohong ea marako a lisele tsa semela mme e fana ka marako a lisele tsa semela tšehetso e matla ea sebopeho le ho tiea.Ka lebaka la ketane e telele ea limolek'hule tsa cellulose le crystallinity e phahameng, e na le botsitso bo matla le ho insolubleness.

(1) Thepa ea selulose le bothata ba ho qhibiliha

Cellulose e na le lintho tse latelang tse etsang hore ho be thata ho qhibiliha:

Bophahamo bo phahameng: Liketane tsa limolek'hule tsa cellulose li etsa sebopeho se thata sa lattice ka libonto tsa haedrojene le matla a van der Waals.

Boemo bo phahameng ba polymerization: Tekanyo ea polymerization (ke hore bolelele ba ketane ea molek'hule) ea selulose e phahame, hangata e tloha ho makholo ho isa ho likete tsa likarolo tsa tsoekere, e leng se eketsang botsitso ba molek'hule.

Hydrogen bond network: Litlamo tsa haedrojene li teng ka bongata lipakeng le ka har'a liketane tsa limolek'hule tsa cellulose, e leng se etsang hore ho be thata ho senngoa le ho qhibilihisoa ke li-solvents tse akaretsang.

(2) Li-reagents tse qhalang cellulose

Hajoale, li-reagents tse tsebahalang tse ka qhalang cellulose ka nepo li kenyelletsa mekhahlelo e latelang:

1. Li-Ionic Liquids

Mekelikeli ea Ionic ke lino tse entsoeng ka li-organic cations le li-anion tsa organic kapa inorganic, hangata tse nang le ho feto-fetoha ha maemo a tlase, botsitso bo phahameng ba mocheso le phetoho e phahameng.Mekelikeli e meng ea ionic e ka qhala selulose, 'me mokhoa o ka sehloohong ke ho khaola maqhama a hydrogen pakeng tsa liketane tsa limolek'hule tsa cellulose.Mekelikeli e tloaelehileng ea ionic e qhibilihisang cellulose e kenyelletsa:

1-Butyl-3-methylimidazolium chloride ([BMIM]Cl): Mokelikeli ona oa ionic o qhaqha cellulose ka ho sebelisana le li-hydrogen bond ka selulose ka li-receptors tsa hydrogen bond.

1-Ethyl-3-methylimidazolium acetate ([EMIM][Ac]): Mokelikeli ona oa ionic o ka qhala likarolo tse phahameng tsa selulose tlas'a maemo a batlang a fokola.

2. Amine oxidant tharollo
Tharollo ea amine e nang le oxidant e kang motsoako o tsoakiloeng oa diethylamine (DEA) le chloride ea koporo e bitsoa [Cu(II) -ammonium solution], e leng mokhoa o matla oa ho qhibiliha o ka qhalang selulose.E senya sebopeho sa kristale ea selulose ka oxidation le hydrogen bonding, e etsa hore ketane ea cellulose e be bonolo le ho qhibiliha haholoanyane.

3. Lithium chloride-dimethylacetamide (LiCl-DMAC) tsamaiso
Sistimi ea LiCl-DMAc (lithium chloride-dimethylacetamide) ke e 'ngoe ea mekhoa ea khale ea ho qhala selulose.LiCl e ka theha tlholisano bakeng sa litlamo tsa haedrojene, ka hona e senya marang-rang a hydrogen bond pakeng tsa limolek'hule tsa cellulose, athe DMAc joalo ka solvent e ka sebelisana hantle le ketane ea limolek'hule tsa cellulose.

4. Tharollo ea Hydrochloric acid / zinki chloride
Tharollo ea hydrochloric acid/zinc chloride ke sesebelisoa se sibolotsoeng sa pele se ka qhalang selulose.E ka qhala selulose ka ho theha phello ea khokahanyo lipakeng tsa zinki chloride le liketane tsa limolek'hule tsa cellulose, le hydrochloric acid e senyang maqhama a haedrojene lipakeng tsa limolek'hule tsa cellulose.Leha ho le joalo, tharollo ena e senya haholo lisebelisoa 'me e lekanyelitsoe lits'ebetsong tse sebetsang.

5. Li-enzyme tsa Fibrinolytic
Li-enzyme tsa fibrinolytic (tse kang li-cellulase) li qhala selulose ka ho thusa ho bola ha selulose hore e be li-oligosaccharides tse nyenyane le monosaccharides.Mokhoa ona o na le mekhoa e mengata e fapaneng ea mekhoa ea ho fetola likokoana-hloko le phetoho ea biomass, le hoja ts'ebetso ea eona ea ho qhibiliha e sa qhibilihe ka ho feletseng lik'hemik'hale, empa e finyelloa ka biocatalysis.

(3) Mokhoa oa ho qhala ha cellulose

Li-reagents tse fapaneng li na le mekhoa e fapaneng ea ho qhaqha selulose, empa ka kakaretso li ka amahanngoa le mekhoa e 'meli e meholo:
Tšenyo ea li-hydrogen bond: Ho senya likamano tsa haedrojene lipakeng tsa liketane tsa limolek'hule tsa cellulose ka tlholisano ea bond ea haedrojene kapa tšebelisano ea ionic, e etsa hore e qhibilihe.
Khatholoho ea ketane ea limolek'hule: Ho eketsa bonolo ba liketane tsa limolek'hule tsa cellulose le ho fokotsa kristale ea liketane tsa molek'hule ka mekhoa ea 'mele kapa ea lik'hemik'hale, e le hore li ka qhibiliha ka lihlapolli.

(4) Lisebelisoa tse sebetsang tsa ho qhibiliha ha cellulose

Ho qhibiliha ha cellulose ho na le ts'ebeliso ea bohlokoa likarolong tse ngata:
Tokisetso ea li-derivatives tsa cellulose: Ka mor'a ho qhibiliha selulose, e ka fetoloa ka ho eketsehileng ka lik'hemik'hale ho lokisa cellulose ethers, cellulose esters le tse ling tse tsoang ho tsona, tse sebelisoang haholo lijong, meriana, liphahlo le masimo a mang.
Lisebelisoa tse thehiloeng ho cellulose: Ho ka sebelisoa selulose e qhibilihisitsoeng, cellulose nanofibers, membrane ea cellulose le lisebelisoa tse ling li ka lokisoa.Lisebelisoa tsena li na le thepa e ntle ea mochini le biocompatibility.
Matla a Biomass: Ka ho qhibiliha le ho senya selulose, e ka fetoloa tsoekere e fermentable bakeng sa tlhahiso ea biofuel e kang bioethanol, e thusang ho finyella nts'etsopele le tšebeliso ea matla a tsosolositsoeng.

Ho qhibiliha ha cellulose ke mokhoa o rarahaneng o kenyelletsang mekhoa e mengata ea lik'hemik'hale le ea 'mele.Li-ionic liquids, amino oxidant solutions, LiCl-DMAc systems, hydrochloric acid/zinc chloride solutions le cellolytic enzymes hajoale li tsejoa e le lisebelisoa tse sebetsang bakeng sa ho qhala selulose.Moemeli e mong le e mong o na le mokhoa oa hae o ikhethang oa ho qhala le sebaka sa ts'ebeliso.Ka boithuto bo tebileng ba mokhoa oa ho qhala ha selulose, ho lumeloa hore ho tla ntlafatsoa mekhoa e metle le e baballang tikoloho, e fanang ka menyetla e mengata ea ts'ebeliso le nts'etsopele ea cellulose.


Nako ea poso: Jul-09-2024