石墨相氮化碳聚乙烯醇复合膜的制备与表征

摘要：本论文以三聚氰胺为原料，通过固相合成法制备出石墨相氮化碳（g-C3N4)，再将g-C3N4填充到聚乙烯醇（PVA）膜中制备出石墨相氮化碳/聚乙烯醇（PVA-g-C3N4）杂化膜。利用电子显微镜(SEM)、傅里叶变换红外光谱仪（FTIR）、接触角分析仪（DSA）、差示扫描量热仪（DSC）和热重分析仪（TGA）对PVA-g-C3N4杂化膜性能进行了具体研究。实验结果表明，与纯PVA和CPVA膜相比，由于g-C3N4与PVA间氢键的形成，PVA-g-C3N4杂化膜的机械性能有了显著提高，在g-C3N4含量为4wt。%时达到最大值；交联剂的添加有利于增强g-C3N4和PVA之间的交联作用，添加量为4wt。% g-C3N4的CPVA-g-C3N4杂化膜与琥珀酸交联后，在纯水中溶胀度从275%急剧降到146%，PVA-g-C3N4杂化膜的热性能、分离性能有了显著提高，在75℃分离90%乙醇水溶液时，总通量最大达到6000g/（m2·h）以上，分离因子达到30。93322

毕业论文关键词：渗透汽化，杂化膜，聚乙烯醇，石墨相氮化碳

Abstract：In this paper, g-C3N4 was prepared by solid-phase synthesis method using melamine as raw material, and g-C3N4 was filled into PVA to prepare PVA-g-C3N4 hybrid membranes。 Hybrid membranes were analyzed by scanning electron microscopy (SEM),fourier transform infrared spectrometry (FTIR),drop shape analyzer (DSA),differential scanning calorimetry(DSC) and thermal gravimetric analysis(TGA)。 The experimental results show that the mechanical properties of PVA-g-C3N4 hybrid membrane have been greatly improved compared with those of PVA and CPVA film due to the formation of hydrogen bonds between g-C3N4 and PVA。 The tensile strength and tensile modulus of hybrid membranesreached the maximum when the content of g-C3N4 was 4wt。%。 The addition of cross-linking agent was beneficial to enhance the cross-linking between g-C3N4 and PVA。 After crosslinked with succinic acid, the swelling of CPVA-g-C3N4 decreased sharply from about 275% to 146% in the pure water。 The thermal property and the separation performances of PVA-g-C3N4 hybrid films were significantly improved。 When the content of g-C3N4 was 4wt。%, the maximum total flux and separation factor reached 6000 g/（m2·h）and 30, respectively at 75℃ for 90% ethanol solution。源F于K优B尔C论V文N网WwW.youeRw.com 原文+QQ752^018766

Keywords：Pervaporation, hybrid membranes, PVA , g-C3N4

1。绪论 4

1。1渗透汽化 4

1。1。1渗透汽化简介 4

1。1。2渗透汽化的机理模型 4

1。1。3渗透汽化膜材料 4

1。1。4优先透水膜 5

1。1。5聚乙烯醇(PVA)膜 5

1。1。6有机-无机杂化膜 5

1。2 石墨相氮化碳的结构与性质 6

1。3 课题研究内容 7

2。实验内容 7

2。1实验试剂与仪器 7

2。2石墨相氮化碳的制备 8

2。3膜的制备 8

2。4测量方法 9

3。结果与讨论 9

3。1石墨相氮化碳的表征 10

3。2膜的机械性能分析 12

3。3膜热性能分析 13

石墨相氮化碳聚乙烯醇复合膜的制备与表征:http://www.youerw.com/huaxue/lunwen_201142.html