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Study On Synthesis And Application Of New Types Of Ion Exchange Resins From Natural Fiber Materials

Posted on:2001-08-02Degree:DoctorType:Dissertation
Country:ChinaCandidate:G H WangFull Text:PDF
GTID:1101360002950208Subject:Forest Products of chemical processing
Abstract/Summary:PDF Full Text Request
New types of ion exchange resins from natural fiber materials such as:polyethylenepolyamino cotton fibers (CFDETA, CFTETA, CFTEPA ),long chainquaternary amino cotton fiber(LCQACF),carboxyl wood powder(CPW), aminowood powders (EDAW, HDAW, TETAW ) and chemically modified barks(FMB,EMB,AMB) were prepared. The five kinds of ion exchange resins' opti-mum synthetic processes, chemical characteristics, adsorption properties and thegermicidal power of LCQACF were discussed. These ion exchange resins werefirst synthesized. They have not been reported in literature.The products were analyzed by EA, FT-IR, MS and NMR.The synthetic conditions, the adsorption mechanism, the thermodynamic andkinetic characteristics of adsorption to Cu2+ for the polyethylenepolyamino cottonfibers were first systematically studied. The experiment results showed that theepoxidation of cotton fiber was the most important in the process. The epoxidevalue was determined by the reactants ratio, reaction time and temperature. Itsoptimum synthetic conditions as follows: epoxidation temperature 20℃,epoxida-tion time 10hrs,cotton: epichlorohydrin = 3: 1 (w/w) ; enamic reaction tempera-ture 50℃,catalyst (Na2CO3) lg. Cu2+ and amino converted into inner-orbitalcomplexes when Cu2+ was adsorbed on polyethylenepolyamino cotton fibers.They formed quaterdentate ligands. When Cu2+ was adsorbed by CFDETA,CFTETA and CFTEPA, their respective adsorption enthalpies(△H) were -26.79 KJ/mol, - 41. 55KJ/mol and -47. 07KJ/mol. Its adsorption process abidedby Langmuir isotherm and was monomolecure adsorption.LCQACF was first prepared. It not only could be used as a kind of adsor-bent, butalso could be used as a kind of bactericide. The experiment resultsshowed that LCQACF could POwerfully kill staphylicocus aureus and bacilluscol-i. In the meantime, LCQAF could adsorb metal ions. Its adsorPtion capacityto Cu2+ was about 47mg/g. LCQACF also had powerfu1 sterilization ability andadsorptiOn capacity after being regenerated.PANW and PAAW were synthesized through the graft coPOlyInrization ofacrylonitrile or acry1andde and wood powder. They were hydrolyzed into the car-boxyl wood POwder by base or acid. The experiment results showed that highcopolyInechtion ratio resultants were prepared by suitable initiator andmonomer. In acid condition, the carboxy1 wood powder was high vield and lowacid value. In base condition, it wa8 low yield and high acid value. The adsorP--..tion caPacities of it to Cu2+ and to basic pink dye were 39. 0mg/g and 500mg/g re-spectively.Three kinds of amino wood powders (EDAW HDAW, TETAW) were madeby alkalization, ePOxidation and andnhation. The optimum reation conditionswere discussed. The ad8orption capacities of EDAW, HDAW and TETAW toCuz+ were 33mg/g, 27mg/g and 43mg/g respectively when PH= 5~6. The re-sults also showed that the carboxyl wood powder and the andno wood powderhad gOOd ability to be regenerated.This paper also discussed the reaction conditions of three kinds of chendcallymodified barks: FMB, EMB and AMB. The experiment results showed that thechemical modifications not only retained the effective composition of bark, butalso improved its chemica1 stability. The adsorption capacities of FMB, EMB andAMB to Cuz+ and to basic pink dye were 71mg/g, 78mg/g, 91mg/gI and 95mg/g, 94mg/g, 1l0Ing/g respectively. They were weak acid anion exchange resins.When they were heated Iong time, their adsorption capacities becam lower.
Keywords/Search Tags:cotton fiber, wood, bark, amnization. graft copolymerization, quat-ernization, ionexchange, sterilization.
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