Ho nka selulose ea baktheria e le lisebelisoa tse tala, kopanya 2-hydroxy-3-sulfate propyate cellulose ether. The infrared spectrometer e hlahloba sebopeho sa sehlahisoa. Maemo a molemo ka ho fetisisa a ts'ebetso bakeng sa motsoako oa baseketeria ea cellulose ether. Liphetho li bontšitse hore matla a phapanyetsano ea 2-hydroxy-3-sulfonic acid e thehiloeng propyate baktheria ether synthesized tlas'a maemo optimization ne 0.481mmol / g.
Mantsoe a sehlooho: cellulose ea baktheria; 2-hydroxyl-3-sulfonic acid e thehiloeng hornemine cellulose ether; phapanyetsano bokgoni
Microbial synthetic bacterial cellulose e tšoana le selulose ea semela ka sebopeho sa lik'hemik'hale le sebopeho sa limolek'hule. Ke polysaccharide e otlolohileng e hokahaneng le tsoekere ea D-pyrarot leβ-1, 4-litlamo tsa glycoside. Ha ho bapisoa le cellulose ea semela, cellulose ea baktheria e na le tšobotsi e ntle. Ke ultra-micro fiber net e entsoeng ka li-ultra -micro fibers. E teng ka mokhoa oa cellulose e hloekileng 'me e na le mesebetsi e mengata e ikhethang. Likarolo tsa lisebelisoa tsa acoustic le meepo ea oli li sebelisitsoe haholo.
2-hydroxyl-3-sulfonate cellular cellulose ether ke motsoako oa bohlokoa oa selulose o ka etsoang ka thepa e phahameng ea ho monya metsi. E ka boela ea sebelisoa e le bohloeki bo tiileng bakeng sa adsorption ea li-ion tsa tšepe tse boima le protheine e le cation. Feng Qingqin, Jie Zhefeng le selulose tse ling tse sebelisoang ka lehlaka la poone ea khetla ea raese ho lokisetsa 2-hydroxyl-3-sulfate cellulose ether e matla phapanyetsano ea cationic acid. Sehlooho sena se sebelisa selulose ea baktheria e le lisebelisoa tse tala, ho kopanya 2-hydroxyl-3-sulfonic acid-based bacterial cellulose ether, le ho sebelisa liteko tsa orthogonal ho ithuta maemo a eona a matle a maiketsetso le 2-hydroxyl-3-sulfa-sulfa sulfa e lokiselitsoeng tlas'a boemo bona. Bokhoni ba ho fapanyetsana ba acid-based gornemine cellulose ether bo fana ka motheo oa theory bakeng sa ts'ebeliso ea 'nete ea thepa.
1. Karolo ea teko
1.1 Lisebelisoa le lisebelisoa
Bacterial cellulose (ho iketsetsa), sodium hydroxide, sodium carbonate, sodium bisulfite, dioxane, epichlorohydrin, acetone, ethanol, sodium carbonate, li-reagents tse ka holimo ke tsa sehlopha sa tlhahlobo.
Lebokose la ho qhoqhoa/ho omisa (Shanghai-Heng Technology Co., Ltd.); GQF-1 jet mill (Powder Center, Nanjing University of Science and Technology); Fourier infrared spectrometer (Jeremane); Agilent AAS-3510 ea ho monya atomic spectrophotometer.
1.2 Tokiso ea 2-hydroxy-3-sulfopropyl bacterial cellulose ether
1.2.1 Tšimoloho ea cellulose ea baktheria e amanang le sefapano
Kenya 10g ea phofo ea baktheria cellulose, 60mL ea epichlorohydrin le 125mL ea 2mol.·Tharollo ea L-1 NaOH ka har'a botlolo e nang le melamo e meraro e nang le "reflux condenser" le "stirrer", mocheso ho reflux bakeng sa 1h, filthara, 'me u hlatsoe ka acetone le metsi ho ea ho thepa e bohareng,' me e omisitsoe tlas'a vacuum ka 60.°C ho fumana selulose ea baktheria e amanang le sefapano.
1.2.2 Synthesis ea sodium 3-chloro-2 hydroxypropanesulfonate
Beha boima ba 104.0gNaHSO3 'me u e qhale ka 200mLH2O, 'me e ke e tlatsoe ka khase ea SO2. Chesa ho fihlela ho 70-90°C ka ho sisinyeha, ebe u eketsa 160mL epichlorohydrin ka funele e theohang, 'me u arabe ka 85.°C bakeng sa 4h. Sehlahisoa sa karabelo se theotsoe ka tlase ho 5°C ho khantša sehlahisoa, ebe se monya sesefa, se hlatsuoa, 'me se omisitsoe ho fumana sehlahisoa se tala se mosehla. Sehlahisoa se tala se ile sa tsosolosoa ka 1: 1 ethanol ho fumana likristale tse tšoeu.
1.2.3 Tšimoloho ea 2-hydroxy-3-sulfopropyl bacterial cellulose ether
Kenya 2 g ea cellulose ea baktheria e amanang le sefapano, palo e itseng ea 3-chloro-2-hydroxypropanesulfonate, 0.7 g ea sodium carbonate, le 70 ml ea tharollo e nang le metsi a dioxane ka har'a botlolo e melang e meraro e nang le "reflux condenser" le "stirrer". naetrojene Ka tlas'a tšireletso, laola mocheso o itseng 'me u hlohlelletse ho itšoara ka nako e itseng, sefa, hlatsoa ka acetone le metsi ka lehlakoreng le leng ho se nke lehlakore, le vacuum-dry ka 60.°C ho fumana 'mala o mosehla o bobebe.
1.3 Tlhahlobo ea sebopeho sa sehlahisoa
Teko ea FT-IR: Letlapa le tiileng la KBr, mofuta oa liteko: 500cm-1～4000cm-1.
1.4 Boikemisetso ba bokhoni ba phapanyetsano
Nka 1-2g ea 2-hydroxy-3-sulfopropyl bacterial cellulose ether, eketsa palo e loketseng ea metsi a hloekisitsoeng ho inela, ebe ue tšela ka kholomong ea phapanyetsano ka ho hlohlelletsa, hlatsoa ka metsi a lekaneng a hloekisitsoeng, ebe u sebelisa hoo e ka bang 100mL 5% Hydrochloric acid rinse, laola sekhahla sa phallo ea 3mL ka motsotso. Ebe o hlatsoa ka metsi a hloekisitsoeng ho fihlela e sa bontše acidity ha e lekoa ke methyl orange, ebe u e-na le hoo e ka bang 60mL ea sodium chloride e nang le motsoako oa 1mol L-1, laola lebelo la ho phalla hoo e ka bang 3mL / min, 'me u bokelle metsi a litšila ka metsi. Botlolo ea Erlenmeyer. Ebe o hlatsoa ka 50-80mL metsi a silafetseng. Tharollo e bokelletsoeng e ne e titrated ka 0.1mol·L-1 sodium hydroxide standard solution e sebelisang phenolphthalein e le indicator, 'me palo ea limililithara tsa sodium hydroxide e sebelisitsoeng e ne e le VNaOH.
2. Liphetho le lipuisano
2.1 Sebopeho sa sebopeho sa cellulose ea baktheria e amanang le sefapano
Ka lebaka la ho hlahisoa ha C-H, cellulose ea baktheria e amanang le sefapano ke 2922.98cm-1. Ho sisinyeha ho hoholo ha C-H holim'a selikalikoe sa tsoekere ea ntlafatsoa, 'me litlhoro tsa ho monya ha lihlopha tsa hydroxyl ho 1161.76cm-1 le 1061.58cm-1 ea spectral line a lia fokola, e leng litlhoro tsa ho monya ha lihlopha tsa hydroxyl ka selulose. Ho 3433.2cm-1, tlhōrō ea ho monya ea thothomela ea sehlopha se amanang le hydroxyl e ntse e le teng, empa matla a lekanyelitsoeng a fokotseha, ho bontša hore sehlopha sa hydroxyl se selikalikoeng sa glucoside ha se e-s'o nkeloe sebaka ka ho feletseng.
2.2 Sebopeho sa sebopeho sa sodium 3-chloro-2-hydroxypropanesulfonate
3525～3481cm-1 ke ho thothomela ho otlolohileng ha mokhatlo oa hydroxyl O-H bond, 2930.96cm-1 ke asymmetric otlolla vibrate ea C.-H, 2852.69cm ke tšisinyeho e lekanang ea C-H, 1227.3cm-1, 1054. 95cm-1 ke ho sisinyeha ho otlolohileng ha S=O, 810.1cm-1 ke ho sisinyeha ho otlolohileng ha COS, 'me 727.4cm-1 ke ho sisinyeha ho otlolohileng ha C.-Cl, e bontšang hore sehlahisoa se reretsoeng se thehoa.
2.3 Sebopeho sa sebopeho sa 2-hydroxy-3-sulfopropyl bacterial cellulose ether
3431cm-1 ke tlhōrō ea OH e otlolohileng ea vibration, 2917cm-1 ke tlhōrō e tsitsitseng ea CH e otlolohileng, 1656cm-1 ke tlhōrō ea CC e otlollang, 1212 ~ 1020cm-1 ke -SO2-antisymmetric le symmetric stretching vibration, 658cm-1 SO bond e otlollang vibrate.
2.4 Ntlafatso ea maemo a kopaneng bakeng sa 2-hydroxy-3-sulfopropyl bacterial cellulose ether
Tekong, matla a phapanyetsano a sebelisitsoe ho lekola boleng ba 2-hydroxy-3-sulfopropyl bacterial cellulose ether. Palo ea 3-chloro-2 hydroxypropanesulfonate sodium e kenyellelitsoeng karabelong, khatello ea tharollo ea metsi a dioxane, nako ea karabelo le mocheso li entse lintlha tse 'ne le maemo a mararo a liteko tsa orthogonal ho sekaseka phello ea ntlha ka' ngoe ho baktheria cellulose xanthate. . Tšusumetso ea thepa ea ester.
Liteko tsa Orthogonal li bontša hore motsoako o nepahetseng oa lintlha tse 4 ke A2B1C3D. 1 Range analysis e bontša hore mocheso oa karabelo o na le tšusumetso e kholo ka ho fetisisa ts'ebetsong ea adsorption ea 2-hydroxy-3-sulfopropyl cellulose ether, 'me mefuta e mengata ke 1. 914, e lateloa ke nako ea nako, dioxane, le tekanyo ea phepo ea 3. - chloro-2 hydroxypropanesulfonate sodium. Matla a phapanyetsano ea 2-hydroxy-3-sulfopropyl bacterial cellulose ether e lokiselitsoeng tlas'a maemo a optimized e ne e le 0.481mmol / g, e neng e le e phahameng ho feta ea mofuta o tšoanang oa SE-cellulose lifate tsa phapanyetsano ea acid cation tse matla tse tlalehiloeng bukeng ea tataiso.
3. Qetello
Ka ho fetola selulose ea baktheria, 2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether e ile ea etsoa, 'me sebopeho sa eona se ne se khetholloa' me matla a eona a phapanyetsano a lekanngoa. Ho ile ha etsoa liqeto tse latelang: 1) 2-hydroxy-3 - Maemo a nepahetseng a ts'ebetso bakeng sa motsoako oa sulfopropyl bacterial cellulose ether ke: 2g cross-linked bacterial cellulose, 3.5g 3-chloro-2-hydroxypropanesulfonate sodium, 0.7g sodium carbonate le 7OmI30% dioxane Aqueous solution, reaction at 70°C tlas'a tšireletso ea naetrojene bakeng sa 1h, 2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether e lokiselitsoeng tlas'a boemo bona e na le matla a ho fapanyetsana a phahameng; 2) Sehlopha sa 2-hydroxy-3-sulfonic acid Matla a phapanyetsano ea propyl bacterial cellulose ether e phahame ho feta ea mofuta o tšoanang oa SE cellulose e matla ea acid cation exchange resin e tlalehiloeng bukeng ea letsoho.
Nako ea poso: Mar-06-2023