聚芳醚砜酮耐高温超滤膜的亲水改性研究

发布时间：2018-06-30 07:31

本文选题：聚芳醚砜酮 + 超滤膜　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：膜分离技术作为一种高效的新型分离技术具有广阔的应用前景,超滤膜在水处理方面更是得到了广泛的应用,但高分子超滤膜亲水性普遍较差,抗污染能力弱,从而阻碍了超滤膜的推广。膜材料的性质是主要的制约因素,开发新型亲水性材料和对已有材料的亲水改性成为改善超滤膜抗污染能力的有效途径。本论文以提高超滤膜的亲水性为研究目的,对超滤膜进行亲水改性并做了系统的研究。本文通过双酚A(BPA)、双酚芴(BHPF)、4,4’-二氟二苯甲酮(DFK)和4,4’-二氯二苯砜(DCS)作为原料,改变双酚A和双酚芴的摩尔比,以无水碳酸钾为缚水剂,制备双酚A/双酚芴型聚芳醚砜酮(PAESK)共聚物,通过热失重等表征手段对共聚物结构性质进行表征;采用浸没沉淀相转化法制备聚芳醚砜酮(PAESK)超滤膜,通过测试其热重、水接触角、孔隙率、水通量、牛血清蛋白截留率、机械强度等性能,结果表明,A/芴比为7:1的超滤膜综合性能较好。通过二氧化钛(Ti O2)纳米粒子对超滤膜进行共混改性,将Ti O2利用超声波的空化作用均匀分布在铸膜液中,刮制成膜。并通过X射线衍射、水接触角、扫面电镜、孔隙率、水通量、牛血清蛋白截留率、机械强度等性能测试,结果表明,引入Ti O2增强了膜的亲水性和机械强度,但水通量有所降低,当Ti O2纳米粒子添加量达到1.0 wt%时改性膜的综合性能最好,抗污染能力得到明显改善。通过共混改性的方法,利用Pluronic F127对超滤膜进行亲水改性,将Pluronic F127直接加入铸膜液混合均匀刮膜,并对改性膜表征和评价。并通过测试水接触角、孔隙率、水通量、牛血清蛋白截留率、机械强度等性能,结果表明,引入Pluronic F127改性膜的亲水性得到改善,改性膜的总污染和不可逆污染均显著降低,水通量有大幅度提升,分析改性膜的综合性能认为Pluronic F127最佳添加量为4 wt%。
[Abstract]:Membrane separation technology, as a new separation technology with high efficiency, has a broad application prospect. Ultrafiltration membrane has been widely used in water treatment, but the hydrophilicity of polymer ultrafiltration membrane is generally poor, and its anti-pollution ability is weak. This hinders the promotion of ultrafiltration membrane. The properties of membrane materials are the main limiting factors. The development of new hydrophilic materials and hydrophilic modification of existing materials is an effective way to improve the anti-fouling ability of UF membranes. In order to improve the hydrophilicity of UF membrane, the hydrophilic modification of UF membrane was studied systematically in this paper. In this paper, the molar ratio of bisphenol A (BPA), bisphenol fluorene (BHPF), difluorobenzophenone (DFK) and dichlorobenzophenone (DCS) was changed, and anhydrous potassium carbonate was used as water binding agent. The copolymers of bisphenol A / diphenol-fluorene polyaryl ether sulfone ketone (PAESK) were prepared and characterized by thermogravimetric analysis. The polyaryl ether sulfone ketone (PAESK) ultrafiltration membrane was prepared by immersion precipitation phase inversion method, and its thermogravimetric and water contact angles were measured. Porosity, water flux, bovine serum protein rejection rate, mechanical strength and so on. The results showed that the comprehensive performance of UF membrane was better when the ratio of A / F was 7:1. The ultrafiltration membrane was modified by titanium dioxide (TIO _ 2) nanoparticles. TIO _ 2 was uniformly distributed in the casting solution by ultrasonic cavitation, and the film was prepared by scraping. The results of X-ray diffraction, water contact angle, scanning electron microscope, porosity, water flux, bovine serum protein rejection, mechanical strength and so on showed that the hydrophilicity and mechanical strength of the membrane were enhanced by introducing TIO 2. However, the water flux was decreased, and the comprehensive properties of the modified membranes were the best when the amount of TIO _ 2 nanoparticles reached 1.0 wt%, and the anti-pollution ability was obviously improved. Pluronic F127 was used for hydrophilic modification of ultrafiltration membrane by blending modification. Pluronic F127 was added directly into casting solution to mix uniform scraping membrane, and the modified membrane was characterized and evaluated. Water contact angle, porosity, water flux, bovine serum protein rejection and mechanical strength were measured. The results showed that the hydrophilicity of the modified membrane was improved, and the total and irreversible fouling of the modified membrane were significantly reduced. The water flux was greatly increased. The optimum addition amount of Pluronic F127 was found to be 4 wt by analyzing the comprehensive properties of the modified membrane.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.893

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