Ukuthatha i-cellulose yebhaktheriya njengezinto eziluhlaza, yenza i-2-hydroxy-3-sulfate propyate cellulose ether. I-spectrometer ye-infrared ihlalutya isakhiwo semveliso. Iimeko zenkqubo ezingcono kakhulu zokwenziwa kwesiseko sebhaktiriya eselulosi ether. Iziphumo zibonise ukuba amandla otshintshiselwano 2-hydroxy-3-sulfonic acid-based propyate ibhaktheriya ether synthesized phantsi kweemeko optimization kwaba 0.481mmol / g.
Amagama angundoqo: i-cellulose yebhaktheriya; I-2-hydroxyl-3-sulfonic acid-based gornemine cellulose ether; umthamo wotshintshiselwano
I-Microbial synthetic bacterial cellulose ifana ne-cellulose yezityalo kwi-chemical composition kunye ne-molecular structure. Yipolysaccharide ethe tye edityaniswe yi-D-pyrarot glucose ngeβ-1, i-4-glycoside bonds. Xa kuthelekiswa ne-cellulose yezityalo, i-cellulose yebhaktheriya inophawu olungcono. Yi-ultra-micro fibre net eyenziwe nge-ultra -micro fibers. Ikhona ngendlela ye-cellulose ecocekileyo kwaye inemisebenzi emininzi ekhethekileyo. Imiba yezixhobo ze-acoustic kunye nemigodi yeoli isetyenziswe ngokubanzi.
I-2-hydroxyl-3-sulfonate i-cellulose ether yeselula yinto ebalulekileyo ye-cellulose derivative enokuthi yenziwe ngezinto eziphezulu zokufunxa amanzi. Ingasetyenziselwa ukucoceka okuqinileyo kwi-adsorption ye-ion yensimbi enzima kunye neprotheni njenge-cation. Feng Qingqin, Jie Zhefeng kunye nezinye cellulose ezisetyenziswa kwiqokobhe irayisi corn straw ukulungiselela 2-hydroxyl-3-sulfate cellulose etere ukutshintshiselana ngeasidi cationic. Eli nqaku lisebenzisa i-cellulose yebhaktheriya njengezinto eziluhlaza, i-synthesizing 2-hydroxyl-3-sulfonic acid-based bacterial cellulose ether, kwaye isebenzisa iimvavanyo ze-orthogonal ukufunda iimeko zayo ezingcono zokwenziwa kunye ne-2-hydroxyl-3-sulfa-sulfa sulfa elungiselelwe phantsi kwale meko. Umthamo wokutshintshiselana we-asidi-based gornemine cellulose ether ibonelela ngesiseko sethiyori sokusetyenziswa kwangempela kwezinto.
1. Inxalenye yovavanyo
1.1 Ii-reagents kunye nezixhobo
I-cellulose yebhaktheriya (i-self-made), i-sodium hydroxide, i-sodium carbonate, i-sodium bisulfite, i-dioxane, i-epichlorohydrin, i-acetone, i-ethanol, i-sodium carbonate, i-reagents engentla ikwibakala lokuhlalutya.
I-incubator/ibhokisi yokomisa (i-Shanghai-Heng Technology Co., Ltd.); I-jet mill ye-GQF-1 (iZiko lePowder, iYunivesithi yaseNanjing yeSayensi kunye neTekhnoloji); I-Fourier infrared spectrometer (eJamani); I-Agilent AAS-3510 i-athom yokufunxa i-spectrophotometer.
1.2 Ukulungiswa kwe-2-hydroxy-3-sulfopropyl bacterial cellulose ether
1.2.1 Ukudibanisa i-cellulose yebhaktheriya edibeneyo
Yongeza i-10g ye-bacterial cellulose powder, i-60mL ye-epichlorohydrin kunye ne-125mL ye-2mol·Isisombululo se-L-1 se-NaOH kwi-flask enentamo ezintathu exhotywe nge-condenser ye-reflux kunye ne-stirrer, ukushisa kwi-reflux ye-1h, i-filter, kunye ne-cross-wash nge-acetone kunye namanzi kwiipropati eziphakathi, kwaye zomiswe phantsi kwe-vacuum kwi-60.°C ukufumana i-cellulose yebhaktiriya edibeneyo.
1.2.2 Ukuhlanganiswa kwe-sodium 3-chloro-2 i-hydroxypropanesulfonate
Yenza i-Weight 104.0gNaHSO3 kwaye uyinyibilikise kwi-200mLH2O, kwaye mayizaliswe ngegesi ye-SO2. Ukufudumala ukuya kuthi ga kwi-70-90°C ngokushukumisa, emva koko wongeze i-epichlorohydrin eyi-160mL ngefunnel yokulahla, kwaye uphendule kuma-85.°C nge4h. Imveliso yokusabela yapholiswa ukuya ngaphantsi kwe-5°C ukuqaqambisa imveliso, emva koko ukufunxa kuhluzwe, kuhlanjwe, kwaye komiswe ukufumana imveliso ekrwada emthubi. Imveliso ekrwada yahlaziywa nge-ethanol ye-1: 1 ukufumana iikristale ezimhlophe.
1.2.3 Ukwenziwa kwe-2-hydroxy-3-sulfopropyl ibhaktiriya cellulose ether
Yongeza i-2 g ye-cellulose yebhaktiriya edibeneyo edibeneyo, umlinganiselo othile we-3-chloro-2-hydroxypropanesulfonate, i-0.7 g ye-sodium carbonate, kunye ne-70 mL yesisombululo esinamanzi se-dioxane kwi-flask enentamo ezintathu efakwe i-condenser ye-reflux kunye ne-stirrer; Initrogen Ngaphantsi kokhuselo, lawula ubushushu obuthile kwaye ushukumise ukusabela kangangexesha elithile, hluza, hlamba nge-acetone kunye namanzi ngokuguqukela kokungathathi hlangothi, kunye ne-vacuum-dry kwi-60.°C ukufumana okuqinileyo okukhanyayo okutyheli.
1.3 Uhlalutyo lwesakhiwo semveliso
Uvavanyo lwe-FT-IR: ithebhulethi ye-KBR eqinile, uluhlu lovavanyo: 500cm-1～4000cm-1.
1.4 Ukumiselwa kwamandla otshintshiselwano
Thatha i-1-2g ye-2-hydroxy-3-sulfopropyl bacterial cellulose ether, yongeza umlinganiselo ofanelekileyo wamanzi adibeneyo ukuze ufunxe, uze uwugalele kwikholamu yotshintshiselwano ngokuvuselela, uhlambulule ngesixa esifanelekileyo samanzi adibeneyo, kwaye usebenzise malunga ne-100mL 5% I-Hydrochloric acid ihlambulule, lawula izinga lokuhamba kwe-3mL ngomzuzu. Emva koko hlamba ngamanzi adiyiweyo de ingabonakalisi iasidi xa ivavanywa yi-methyl orange, uze u-elute malunga ne-60mL ye-sodium chloride ene-concentration ye-1mol L-1, lawula izinga lokuhamba malunga ne-3mL/min, kwaye uqokelele amanzi amdaka nge- Erlenmeyer iflaski. Emva koko hlamba ikholamu nge-50-80mL yamanzi adibeneyo. Isisombululo esiqokelelweyo sifakwe kwi-0.1mol·I-L-1 isisombululo esiqhelekileyo se-sodium hydroxide usebenzisa i-phenolphthalein njengesalathisi, kunye nenani leemililitha ze-sodium hydroxide ezisetyenzisiweyo yi-VNaOH.
2. Iziphumo kunye nengxoxo
2.1 Ukubonakaliswa kwesakhiwo se-cellulose yebhaktheriya edibeneyo
Ngenxa yokwaziswa kweC-H, i-cellulose yebhaktheriya edibeneyo edibeneyo yi-2922.98cm-1. Ukungcangcazela kwe-C-I-H kwiringi yeswekile iphuculwe, kunye neempawu zokufunxa iincopho zamaqela e-hydroxyl kwi-1161.76cm-1 kunye ne-1061.58cm-1 yomgca we-spectral a zibuthathaka, ezi ziincopho zeempawu zokufunxa kwamaqela e-hydroxyl kwiselulosi. Kwi-3433.2cm-1, i-vibrational absorption incopho yeqela elinxulumene ne-hydroxyl isekhona, kodwa ukuqina okuhambelanayo kuyancipha, kubonisa ukuba iqela le-hydroxyl kwiringi ye-glucoside alizange lithathelwe indawo ngokupheleleyo.
2.2 Ukubonakaliswa kwesakhiwo se-sodium 3-chloro-2-hydroxypropanesulfonate
3525～I-3481cm-1 kukungcangcazela okuyolula kombutho we-hydroxyl O-Ibhondi ye-H, 2930.96cm-1 yi-asymmetric stretching vibration ye-C.-H, 2852.69cm luphawu lokungcangcazela olulinganayo lweC-H, 1227.3cm-1, 1054. I-95cm-1 kukungcangcazela okuyolula kwe-S=O, 810.1cm-1 kukungcangcazela kwe-COS, kunye ne-727.4cm-1 kukungcangcazela okuzolula kwe-C.-Cl, ebonisa ukuba imveliso ekujoliswe kuyo yenziwe.
2.3 Ukubonakaliswa kwesakhiwo se-2-hydroxy-3-sulfopropyl ibhaktiriya cellulose ether
I-3431cm-1 yincopho ye-OH yokwelula i-vibration, i-2917cm-1 yincopho ye-CH egcweleyo yokwelula i-vibration, i-1656cm-1 yincopho ye-CC yokwelula i-vibration, i-1212 ~ 1020cm-1 yi -SO2-antisymmetric kunye ne-symmetric stretching stretching-68cm, i-1 i-SO bond ezolula ukungcangcazela.
2.4 Ukulungiswa kweemeko ze-synthesis ye-2-hydroxy-3-sulfopropyl ibhaktheriya cellulose ether
Kuvavanyo, umthamo wokutshintshiselana wasetyenziselwa ukuvavanya umgangatho we-2-hydroxy-3-sulfopropyl bacterial cellulose ether. Ubungakanani be-3-chloro-2 ye-hydroxypropanesulfonate sodium eyongeziweyo kwi-reaction, i-concentration ye-dioxane isisombululo se-aqueous, ixesha lokuphendula kunye nobushushu zenze izinto ezine kunye namanqanaba amathathu ovavanyo lwe-orthogonal ukuhlalutya umphumo wento nganye kwi-bacterial cellulose xanthate. . Impembelelo yeepropati ze-ester.
Iimvavanyo ze-Orthogonal zibonisa ukuba indibaniselwano efanelekileyo yezinto ezi-4 yi-A2B1C3D. Uhlalutyo lwe-1 Uluhlu lubonisa ukuba ukushisa okusabelayo kunempembelelo enkulu ekusebenzeni kwe-adsorption ye-2-hydroxy-3-sulfopropyl cellulose ether, kwaye uluhlu luyi-1. 914, lulandelwa kukugxininiswa kwexesha, i-dioxane, kunye nemali yokutya ye-3. -chloro-2 hydroxypropanesulfonate sodium. Umthamo wokutshintshiselana we-2-hydroxy-3-sulfopropyl i-bacterial cellulose ether elungiselelwe phantsi kweemeko eziphuculweyo yi-0.481mmol / g, eyayiphezulu kune-SE-type cellulose efana nemithi yokutshintshiselana nge-acid cation echazwe kwincwadana.
3. Isiphelo
Ngokuguqula i-cellulose ye-bacterial, i-2-hydroxy-3-sulfonic acid i-propyl ibhaktheriya ye-cellulose ether yenziwe, kwaye isakhiwo sayo sibonakaliswe kwaye amandla ayo otshintshiselwano alinganiswa. Ezi zigqibo zilandelayo zenziwe: 1) 2-hydroxy-3 - Iimeko zenkqubo efanelekileyo yokwenziwa kwe-sulfopropyl bacterial cellulose ether yile: 2g i-cellulose ye-bacterial cross-linked, 3.5g 3-chloro-2-hydroxypropanesulfonate sodium, 0.7g sodium carbonate kunye ne-7OmI30% ye-dioxane isisombululo se-Aqueous, ukuphendula kwi-70°C phantsi kokukhuselwa kwe-nitrogen ye-1h, i-2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether elungiselelwe phantsi kwale meko inomthamo ophezulu wokutshintshiselana; 2) Iqela le-2-hydroxy-3-sulfonic acid Umthamo wotshintshiselwano we-propyl bacterial cellulose ether uphezulu kunolo lwe-SE yohlobo olufanayo lwe-cellulose eyomeleleyo ye-acid cation exchange resin echazwe kwincwadana.
Ixesha lokuposa: Mar-06-2023