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ID:33368118
大小:10.33 MB
页数:55页
时间:2019-02-25
《醋酸纤维素聚丙烯腈复合超滤膜的制备》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文以醋酸纤维素(CA)及聚丙烯腈(PAN)为膜材料,以纳米三氧化二铝(A12031为添加剂,通过浸入一沉淀相转化法制备了有机一无机超滤膜,从铸膜液组成及成膜条件两个方面考察成膜规律,并对膜进行了酸、碱水解改性实验。在铸膜液组成方面,考察了纳米舢203的含量对铸膜液粘度、膜接触角、机械性能、水通量及截留率的影响。成膜条件方面主要考察了凝固浴温度及凝固浴中表面活性剂的浓度。水解改性实验主要考察了不同浓度的NaOH的乙醇溶液以及不同浓度HCl溶液对膜性能的影响。实验结果表明,纳米他03的加入使铸膜液的粘度大大增加,更易成膜;随着纳米粒子含量的增加,膜与水的接触角降低,亲水性增强;膜的断裂强度及
2、断裂伸长率增大,膜的机械性能得到改善。膜表层孔径及空隙率先增大后减小,水通量增大,截留率减小。在一定温度下,膜表面孔径及孔隙率随凝固浴温度的增加而变大,水通量增大,截留率降低。凝固浴中加入表面活性剂,膜的水通量及截留率得到改善。采用NaOH的乙醇溶液对膜进行水解改性时,机械性能大大降低,效果不理想;不同浓度HCI溶液对膜改性,膜水通量降低,截留率提高,耐污染性得到很大改善。关键词:醋酸纤维素;聚丙烯腈;超滤膜;纳米三氧化二铝AbstractCA/PANcompositeultrafiltrationmembranesWerepreparedbyphasereversemethodusingna
3、no—A1203asadditives.Thecompositionofcastingsolutionandmembraneformingconditionwel'estudied.HCIsolutionandalcoholesolutionofNaOHwgreusedtomodifythemembrane.Theconcentrationofnano-A1203werechangedwhileconsideringthecastingsolution.Compositionandvisieosityofcastingsolution,contactangle,mechanicalperfor
4、mance,waterfluxandrejectionofBSAsolutionwerestudied.Thetemperatureofwaterbathandsodiumdodecylsulfate(SDS)concentrationinthebathwerechangedwhileconsideringthemembraneformingconditionandtheconcentrationofNaOHandHCIsolutionwerechangedwhileconsideringmodifingprocess.Experimentresultsshowedthattheadditiv
5、esofnano-A-1203increasedtheviscosityandthemembraneprocessbecamemucheasier.Increasingtheconcentrationofnano-A1203,thecontactangledecreased—hydrophilyincreased.Thetensilestrcnthandbreakingdongationincreased-themechanicalpropertyimproved.Theporesandfactorofporosityincreasedfirstlyandthendecreased.Thefl
6、uxincreasedandrejectiondecreased.Undersometemperaturespores,factorofporosityandfluxincreasedbyimprovingtemperaturesandtherejectiondecreased.ProperadditionofSDScanimprover叼eefionandfluxofmembrane..AftermodifiedbyNaOHalcohoholesolution,themechnicalpropertydecreasedandtheresultWasnotgood.Whenmodifiedby
7、HCIsolutionthefluxdecreased.Therejectionandantifoulingpropertyimproved.Keywords:CA;PAN;ul舰6l虹ationmembrane;nano一灿203青岛入学硕士学位论文学位论文独创性声明本人声明,所呈交的学位论文系本人在导师指导下独立完成的研究成果。文中依法引用他人的成果,均已做出明确标注或得到许可。论文内容未包含
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