Kutenga cellulose bakiteriya monga zopangira, pangani 2-hydroxy-3-sulfate propyate cellulose ether. Infrared spectrometer imasanthula kapangidwe kazinthu. Best ndondomeko zinthu synthesis bakiteriya cellulose ether. The zotsatira anasonyeza kuti mphamvu kuwombola 2-hydroxy-3-sulfonic asidi ofotokoza propyate bakiteriya efa apanga pansi kukhathamiritsa zinthu anali 0.481mmol / g.
Mawu osakira: bakiteriya cellulose; 2-hydroxyl-3-sulfonic acid-based gornemine cellulose ether; kusintha mphamvu
Ma cellulose opangidwa ndi bakiteriya opangidwa ndi ma cellulose amafanana ndi cellulose yamafakitale pamapangidwe amankhwala komanso ma cell. Ndi polysaccharide yowongoka yolumikizidwa ndi D-pyrarot glucose ndiβ-1, 4-glycoside zomangira. Poyerekeza ndi cellulose ya zomera, cellulose ya bakiteriya ili ndi khalidwe labwino. Ndi ultra-micro fiber ukonde wopangidwa ndi ultra-micro fibers. Imakhala mu mawonekedwe a cellulose yoyera ndipo imakhala ndi ntchito zambiri zapadera. Mbali za zida zamayimbidwe ndi migodi yamafuta zakhala zikugwiritsidwa ntchito kwambiri.
2-hydroxyl-3-sulfonate cellulose ether ndi yofunika kwambiri yochokera ku cellulose yomwe imatha kupangidwa ndi zinthu zambiri zomwe zimayamwa madzi. Itha kugwiritsidwanso ntchito ngati chiyero cholimba cha ma adsorption of heavy metal ayoni ndi mapuloteni ngati cation. Feng Qingqin, Jie Zhefeng ndi mapadi ena ntchito mu mpunga chipolopolo chimanga udzu kukonzekera 2-hydroxyl-3-sulfate mapadi etero amphamvu asidi cationic kuphana. Nkhaniyi imagwiritsa ntchito cellulose ya bakiteriya monga zopangira, kupanga 2-hydroxyl-3-sulfonic acid-based bacterial cellulose ether, ndipo imagwiritsa ntchito kuyesa kwa orthogonal kuti iphunzire zinthu zake zabwino zopangira ndi 2-hydroxyl-3-sulfa-sulfa sulfa wokonzeka pansi pa chikhalidwe ichi. Kusinthana kwa asidi-based gornemine cellulose ether kumapereka maziko ongoyerekeza akugwiritsa ntchito kwenikweni kwa zinthuzo.
1. Gawo loyesera
1.1 Reagents ndi zida
Ma cellulose a bakiteriya (wodzipangira okha), sodium hydroxide, sodium carbonate, sodium bisulfite, dioxane, epichlorohydrin, acetone, ethanol, sodium carbonate, ma reagents omwe ali pamwambawa ndi owunikira.
Chofungatira/choumitsa bokosi (Shanghai-Heng Technology Co., Ltd.); GQF-1 jet mphero (Powder Center, Nanjing University of Science and Technology); Fourier infrared spectrometer (Germany); Agilent AAS-3510 atomic mayamwidwe spectrophotometer.
1.2 Kukonzekera kwa 2-hydroxy-3-sulfopropyl bakiteriya cellulose ether
1.2.1 Kaphatikizidwe ka cellulose yolumikizana ndi bakiteriya
Onjezani 10g wa bakiteriya cellulose ufa, 60mL wa epichlorohydrin ndi 125mL wa 2mol·L-1 NaOH yankho mu botolo la makosi atatu okhala ndi reflux condenser ndi chotsitsimutsa, kutentha kwa reflux kwa 1h, fyuluta, ndi kusamba kwapakati ndi acetone ndi madzi kuzinthu zapakati, ndi zouma pansi pa vacuum pa 60.°C kuti apeze cellulose yolumikizana ndi bakiteriya.
1.2.2 Kaphatikizidwe wa sodium 3-chloro-2 hydroxypropanesulfonate
Yezani 104.0gNaHSO3 ndikusungunula mu 200mLH2O, ndipo mulole kuti ikhale yodzaza ndi mpweya wa SO2. Kutentha mpaka 70-90°C ndi kusonkhezera, kenaka onjezerani 160mL epichlorohydrin ndi chitsulo chogwetsa, ndikuchitapo pa 85.°c pa 4h. Zomwe zimapangidwira zidakhazikika mpaka pansi pa 5°C kuti crystallize mankhwala, ndiye kuyamwa zosefedwa, kutsukidwa, ndi zouma kupeza wotumbululuka wachikasu yaiwisi mankhwala. Zinthu zopanda pake zidasinthidwanso ndi 1: 1 ethanol kuti ipeze makhiristo oyera.
1.2.3 Kaphatikizidwe ka 2-hydroxy-3-sulfopropyl bakiteriya cellulose ether
Onjezani 2 g ya cellulose yolumikizana ndi bakiteriya, kuchuluka kwa 3-chloro-2-hydroxypropanesulfonate, 0,7 g ya sodium carbonate, ndi 70 mL ya dioxane amadzimadzi mu botolo la makosi atatu lomwe lili ndi condenser ya reflux ndi chotsitsimutsa; Nayitrogeni Pansi pa chitetezo, wongolerani kutentha kwina ndikugwedeza kuti muchitepo kwakanthawi, fyuluta, sambani ndi acetone ndi madzi kuti musatengere ndale, ndikuwumitsani pa 60.°C kupeza kuwala chikasu cholimba.
1.3 Kusanthula kapangidwe kazinthu
Mayeso a FT-IR: piritsi lolimba la KBr, mayeso osiyanasiyana: 500cm-1～4000cm-1.
1.4 Kutsimikiza kwa mphamvu yosinthira
Tengani 1-2g wa 2-hydroxy-3-sulfopropyl bakiteriya mapadi efa, kuwonjezera yoyenera kuchuluka kwa madzi osungunuka kuti zilowerere, ndiye kutsanulira mu ndime kuwombola ndi oyambitsa, nadzatsuka ndi yoyenera kuchuluka kwa madzi osungunuka, ndiyeno ntchito za 100mL 5% Hydrochloric acid muzimutsuka, kuwongolera kuthamanga kwa 3mL pamphindi. Kenako yambani ndi madzi osungunuka mpaka osawonetsa acidity mukayesedwa ndi methyl lalanje, kenaka muzitsuka ndi pafupifupi 60mL ya sodium chloride yokhala ndi 1mol L-1, kuwongolera kuthamanga kwa pafupifupi 3mL/mphindi, ndikusonkhanitsa madziwo ndi Botolo la Erlenmeyer. Kenako yambani ndime ndi 50-80mL madzi osungunuka. Yankho losonkhanitsidwa lidasinthidwa ndi 0.1mol·L-1 sodium hydroxide muyezo njira ntchito phenolphthalein monga chizindikiro, ndi chiwerengero cha milliliters sodium hydroxide ankadya anali VNaOH.
2. Zotsatira ndi zokambirana
2.1 Mapangidwe a cellulose yolumikizana ndi bakiteriya
Chifukwa cha kukhazikitsidwa kwa C-H, cellulose yolumikizana ndi bakiteriya ndi 2922.98cm-1. Kuthamanga kwamphamvu kwa C-H pa mphete ya shuga imakulitsidwa, ndipo mawonekedwe a mayamwidwe apamwamba a magulu a hydroxyl pa 1161.76cm-1 ndi 1061.58cm-1 ya mzere wowonera amafooka, omwe ndi nsonga zamayamwidwe amagulu a hydroxyl mu cellulose. Pa 3433.2cm-1, chiwopsezo cha kugwedezeka kwa gulu la hydroxyl chomwe chikugwirizana nacho chidakalipo, koma mphamvu yachibale imachepa, kusonyeza kuti gulu la hydroxyl pa mphete ya glucoside silinalowe m'malo.
2.2 Mapangidwe mawonekedwe a sodium 3-chloro-2-hydroxypropanesulfonate
3525～3481cm-1 ndiye kugwedezeka kotambasula kwa mayanjano a hydroxyl O-H chomangira, 2930.96cm-1 ndiye kugwedezeka kwa asymmetric kwa C-H, 2852.69cm ndiye kugwedezeka kofanana kwa C-H, 1227.3cm-1, 1054. 95cm-1 ndiko kutambasula kwa S=O, 810.1cm-1 ndiko kutambasula kwa COS, ndi 727.4cm-1 ndiko kutambasula kwa C-Cl, kusonyeza kuti chandamale mankhwala apangidwa.
2.3 Mapangidwe a 2-hydroxy-3-sulfopropyl bakiteriya cellulose ether
3431cm-1 ndiyenso OH yotambasulira pachimake, 2917cm-1 ndiye nsonga yotambasulira ya CH, 1656cm-1 ndiye nsonga yotambasulira ya CC, 1212 ~ 1020cm-1 ndi -SO2-antisymmetric ndi symmetric yotambasula 658cm, 1212 ~ 1020cm-1 SO bond yotambasula kugwedezeka.
2.4 Kukhathamiritsa kwa zinthu kaphatikizidwe kwa 2-hydroxy-3-sulfopropyl bakiteriya cellulose ether
Poyesera, mphamvu yosinthira idagwiritsidwa ntchito kuyesa mtundu wa 2-hydroxy-3-sulfopropyl bakiteriya cellulose ether. Kuchuluka kwa 3-chloro-2 hydroxypropanesulfonate sodium anawonjezera mu anachita, ndende ya dioxane amadzimadzi njira, zimene nthawi ndi kutentha achita zinthu zinayi ndi milingo itatu ya mayesero orthogonal kusanthula zotsatira za chinthu chilichonse pa bakiteriya cellulose xanthate. . Mphamvu ya ester katundu.
Kuyesa kwa Orthogonal kukuwonetsa kuti kuphatikiza koyenera kwa zinthu zinayi ndi A2B1C3D. 1 Range kusanthula limasonyeza kuti anachita kutentha ali ndi chikoka chachikulu pa adsorption ntchito 2-hydroxy-3-sulfopropyl mapadi efa, ndi osiyanasiyana 1. 914, kenako ndende ya nthawi, dioxane, ndi kudyetsa kuchuluka 3. - chloro-2 hydroxypropanesulfonate sodium. Kusinthana kwa 2-hydroxy-3-sulfopropyl bakiteriya cellulose ether yokonzedwa pansi pamikhalidwe yabwino kwambiri inali 0.481mmol/g, yomwe inali yapamwamba kuposa ya SE-mtundu wa cellulose wamphamvu acid cation kuwombola mitengo inanena mu bukhuli.
3. Mapeto
Posintha bakiteriya cellulose, 2-hydroxy-3-sulfonic acid propyl bakiteriya cellulose ether adapangidwa, ndipo mawonekedwe ake adadziwika ndipo mphamvu yake yosinthira idayesedwa. Zotsatirazi zinatengedwa: 1) 2-hydroxy-3 - The mulingo woyenera kwambiri ndondomeko zinthu kwa synthesis sulfopropyl bakiteriya mapadi ether ndi: 2g mtanda bakiteriya mapadi cellulose, 3.5g 3-chloro-2-hydroxypropanesulfonate sodium, 0.7g sodium carbonate ndi 7OmI30% dioxane Aqueous solution, reaction at 70°C pansi pa chitetezo cha nayitrogeni kwa 1h, 2-hydroxy-3-sulfonic acid propyl bakiteriya cellulose ether yokonzedwa pansi pa chikhalidwe ichi imakhala ndi mphamvu yowonjezera yowonjezera; 2) 2-hydroxy-3-sulfonic acid gulu Kuthekera kwa kusinthana kwa propyl bakiteriya mapadi efa ndi apamwamba kuposa ofanana SE mtundu mapadi amphamvu asidi cation kuwombola utomoni anafotokoza mu bukhuli.
Nthawi yotumiza: Mar-06-2023