A型沸石膜的制备及其在气体脱湿中的应用

用水热合成法合成了Ａ型沸石膜，探讨了Ａ型沸石膜的制备方法和工艺条件；用ＸＲＤ，ＳＥＭ等对沸石膜进行了表征；考察了沸石膜对Ｎ２、Ｈ２的分离性能；对沸石膜脱湿性能进行了研究。     

一种制备镶嵌荷电膜的新材料PISIP五嵌段共聚物的合成与表征

从分子设计出发，合成了一种用于制备膜嵌荷电膜的新材料：聚（４－乙烯基吡啶－异戊二烯－苯乙烯－异戊二烯－４－乙烯基吡啶）（ＰＩＳＩＰ）五嵌段共聚物，并用ＩＲ，ＮＭＲ，ＧＰＣ，ＤＳＣ等方法对共聚物结构进行了表征。     

MSnO_3和MSn_（0．5）Zr_（0．5）O_3（M＝Sr，Ba）的水热合

本文利用水热合成方法对ＭＳｎＯ３和ＭＳｎ（０．５）Ｚｒ（０．５）Ｏ３（Ｍ＝Ｓｒ，Ｂａ）的合成进行了研究，并采用ＸＲＤ、ＳＥＭ和ＩＣＰ等方法对产物进行了表征，结果表明：在Ｍ（ＯＨ）２－ＳｎＯ２（或ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ体系中，当ＫＯＨ／Ｓｎ和ＫＯＨ／（Ｓｎ＋Ｚｒ）≥３０时，２６０℃下晶化５～７天，可获得ＭＳｎＯ３和ＭＳｎ（０．５）Ｚｒ（０．５）Ｏ３纯相，在Ｍ（ＯＨ）２－（ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ－Ｈ２Ｏ体系中，可通过控制介质碱度来获得ＭＳｎＯ３＋ＭＺｒＯ３混合物和ＭＳｎ（０．５）Ｚｒ（０．５）Ｏ３，并根据合成规律初步探讨了反应过程．     

一种制备镶嵌荷电膜的新材料MsISIMs五嵌段共聚物的合成与表征

从分子设计出发，合成了一种用于制备镶嵌荷电膜的新材料：聚（４－甲基苯乙烯－异戊二烯－苯乙烯－异戊二烯－４－甲基苯乙烯）三元五嵌段共聚物，并用ＦＴＩＲ，＾１Ｈ－ＮＭＲ，ＧＰＣ，ＤＳＣ，ＴＥＭ等对共聚产物进行了表征，证实了ＭｓＩＳＩＭｓ是制备镶嵌荷电膜的理想膜材料。     

配合物[Mn(phen)_2]~(2 )修饰的MCM-41的合成与表征

分别以γ－氨丙基和甲基丙烯酸丙酯基修饰介孔分子筛ＭＣＭ－４１内孔壁,将引入的有机官能团与金属配位离子［Ｍｎ（ｐｈｅｎ）２Ｃｌ］＋通过配位健成键首次合成了锰（Ⅱ）配位化合物修饰的ＭＣＭ－４１（ＭＣＭ－ａｐ－Ｍｎ（ｐｈｅｎ）２,ＭＣＭ－ｍｐ－Ｍｎ（Ｐｈｅｎ）２）．通过ＸＲＤ、ＦＴＩＲ、７７Ｋ氮气吸附－脱附、ＵＶ－ＶＩＳ漫反射光谱和Ｍｎ２＋电子顺磁共振谱（ＥＳＲ）表征了复合物ＭＣＭ－ａｐ－Ｍｎ（ｐｈｅｎ）２和ＭＣＭ－ｍｐ－Ｍｎ（ｐｈｅｎ）２由于有机基团对ＭＣＭ－４１孔壁的修饰,使复合物的结晶度降低,增加的有机基因和配合物使红外光谱有所改变;ＢＥＴ比表面积,孔容和最可几孔径均下降;γ－氨丙基或甲基丙烯酸丙酯基与Ｍｎ２＋的配位而使其ＵＶ－ＶＩＳ漫反射吸收光谱在短波长的吸收加强;室温下 Ｍｎ２＋电子顺磁共振表明 Ｍｎ（Ⅱ）配位环境几乎没有变化．     

MSnO3和MSn0.5Zr0.5O3（M=Sr,Ba）的水热合成

本文利用水热合成方法对ＭＳｎＯ３和ＭＳｎ０．５Ｚｒ０．５（Ｍ＝Ｓｒ，Ｂａ）的合成进行了研究，并采用ＸＲＤ、ＳＥ几ＩＣＰ等进行产物进行了表征，结果表明：在Ｍ（ＯＨ）２．ＳｎＯ２（呈ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ体系中，当ＫＯＨ／Ｓｎ和ＫＯＨ（Ｓｎ＋Ｚｒ）≥３０时，２６０℃下晶化５－７天，可获得ＭＳｎＯ３和ＭＳｎ０．５Ｏ３纯相，在Ｍ（ＯＨ）３－（ＳｎＯ２＋ＺｒＯ３）－ＫＯＨ－Ｈ２Ｏ体系中，可通过控制介质     

金属Pt团簇在氧化钛修饰MCM-41中的组装

采用光沉积的合成方法将纳米金属Ｐｔ组装于氧化钛修饰ＭＣＭ－４１孔道中,并对合成的样品进行了ＸＲＤ、ＸＰＳ、ＵＶ－vis、Ｎ₂吸附－脱附等结构表征．光电子能谱表明组装的Ｐｔ呈金属状态;Ｎ_２吸附－脱附数据表明组装于孔道中的Ｐｔ虽然使ＭＣＭ－４１的ＢＥＴ比表面和孔容下降,但是由于Ｐｔ的组装量较小,使其对孔径分布的影响较小．由于Ｐｔ的引入,使其紫外－可见光漫反射吸收光谱与氧化钛修饰的ＭＣＭ－４１不同．     

纳米Au团簇在氧化钛修饰的介孔分子筛MCM-41中的组装

以钛酸丁酯为ＴｉＯ_２前驱体,使ＴｉＯ_２均匀分散于纯硅介孔分子筛ＭＣＭ－４１的介孔孔道内表面,利用ＴｉＯ_２光学性质将ＡｕＣｌ－４还原为Ａｕ（０）并组装于氧化钛修饰的ＭＣＭ－４１孔道中．对所合成的Ａｕ负载的氧化钛修饰的ＭＣＭ－４１进行了ＸＲＤ,ＸＰＳ,Ｎ_２吸附－脱附曲线,及固体ＵＶ－Ｖｉｓ漫反射等多种结构表征．由ＸＰＳ谱和固体ＵＶ－Ｖｉｓ漫反射吸收光谱的ｐｌａｓｍｏｎ吸收峰证明Ａｕ团簇呈现０价的金属状态．     

用MBO(口恶)唑啉合成LDPE/PS合金相容剂及其对合金的增容作用

采用１,３－双－（恶唑啉基）－苯为偶联剂通过反应性加工实现ＰＳ－ｇＭＡｎ和氯化聚乙烯之间反应方法来合成ＬＤＰＥ／ＰＳ共混体系相容剂,在ＬＤＰＥ／ＰＳ共混体系中加入１０％此相容剂,其冲击强度提高２．３倍,拉伸强度和弯曲强度也有所提高。通过ＳＥＭ、ＤＭＡ和ＤＳＣ分析表征表明加入此相容剂后,ＬＤＰＥ／ＰＳ共混物的相容性有显著改善。     

纯沸石膜制备及表征

在多孔陶瓷载体上制备过渡层，再以水热法合成出ＺＳＭ－５型沸石膜，经扫描电镜测定，膜厚１２μｍ，过渡层厚１３．８μｍ。将ＺＳＭ－５沸石膜用于乙醇水渗透蒸发分离，分离因数为１５，这时其渗透通量为０．４６ｋｇ／ｍ＾２．ｈ．。     

分子筛填充聚砜膜气体渗透特性研究

制备了分子筛填充聚砜膜,并考察了分子筛填充量对氢、氮、乙烯等气体的渗透特性的影响．实验结果表明,在一定的分子含量范围内成膜过程中会发生分子筛的自聚集现象,从而导致分子筛在膜内的非均匀分布．与此相对应,膜的气体渗透特性也发生突变．     

沸石分子筛膜研究新进展

介绍了6种沸石分子筛膜及其结构，评论了沸石膜的合成方法，综述了沸石膜的发展和应用，展望了沸石膜的发展前景．     

FAU-type zeolite membranes synthesized by microwave assisted in situ crystallization

FAU-type zeolite membranes were prepared by an “in situ aging-microwave synthesis” (AM) method using a clear solution with the molar composition of 70Na₂O: 1Al₂O₃: 20SiO₂: 2000H₂O. After two-stage AM synthesis, a defect-free FAU zeolite layer consisted of uniform zeolite crystals was formed on the support surface. The Si/Al ratio was ca. 1.5. The single-gas permeation and single-liquid vapor permeation properties of the as-synthesized zeolite membranes were investigated. The permselectivity of H₂ and N₂ was as high as 4.25 for FAU-type zeolite membranes. Pervaporation measurements were carried out for the dehydration of ethanol and isopropanol aqueous solutions. FAU-type zeolite membranes displayed relatively high permeation flux and water-selectivity.     

PVA/ZSM-5分子筛复合膜的制备与性能研究

目的以聚乙烯醇(PVA)为基体材料,添加ZSM-5沸石分子筛和富马酸交联剂制备出一系列的复合膜,研究分子筛含量对复合膜性能的影响。方法用流延法制备复合膜,进行X射线衍射分析和扫描电镜分析,测定复合膜的拉伸性能、耐水溶胀性、透光率与雾度。结果经富马酸交联后PVA薄膜的拉伸强度和耐水溶性得到了明显改善,随着分子筛含量的增多,复合膜的拉伸强度逐渐减小,分子筛的加入对复合膜的溶胀度和透光性都有降低作用。结论从综合测定结果来看,ZSM-5分子筛质量分数为5%时的复合膜具有相对较好的性能。     

Performance optimization of polyetherimide-zeolite 4A mixed matrix membranes for carbon dioxide/methane separation process using response surface methodology

The performance optimization studies of zeolite 4A embedded polyetherimide mixed matrix membranes to separate carbon dioxide/methane by simultaneously considering the effect of process parameters on process responses were the focus of this study. Mixed matrix membranes were characterized and analyzed. The thermophysical characteristics of the synthesized membranes were assessed by different analytical equipment. The permeability of pure gases was determined at varying feed pressures (4 bar to 10 bar) to evaluate gas separation performance. Process optimization studies were accomplished by response surface methodology to find the relation of pressure and zeolite loading on carbon dioxide and methane permeability, and carbon dioxide/methane selectivity. The characterization results revealed that all membranes were dense in structure and has improved thermal stability. The spectrometry results confirmed the molecular interaction between polyetherimide and zeolite 4A filler. Gas permeability results showed a more than 90 % increase in carbon dioxide permeability compared to the nascent polyetherimide membrane. Similarly, selectivity of mixed matrix membranes was 45 % higher than polyetherimide membrane. The optimal operating conditions were found to be 20 wt. % zeolite loading and 6 bar pressure with overall desirability of 0.700. These membranes can find potential in various gas separation applications.     

NaA分子筛改性聚砜超滤膜的通量及截留性能

利用溶液相转化法,在铸膜液中加入分子筛NaA和PEG来协同提高聚砜超滤膜的水通量和截留率,研究了分子筛的含量对聚砜超滤膜的形貌结构,表面粗糙度,水通量,蛋白质截留率和亲水性的影响。利用场发射扫描电镜、扫描探针原子力显微镜、膜评价仪和接触角仪分别对该膜的形貌、水通量、蛋白质截留率和亲水性进行表征。结果表明分子筛含量从0g增加到3.0g,聚砜超滤膜的水通量从140L/(m2·h)提高到500L/(m2·h),对胃蛋白酶的截留率从78.8%提高到92.7%,对牛血清蛋白的截留率从97.6%增加到99.0%以上。分子筛NaA可以协同提高聚砜超滤膜的水通量和蛋白质截留率。     

再生纤维素超滤膜的研制及其耐污染性研究

以纤维素浆板和二醋酸纤维素为原料 ,通过直接制膜和醋酸纤维素成膜后水解两种方法制备再生纤维素超滤膜 ,并以酱油、药酒和牛奶等为料液 ,对膜进行了耐污染实验 .与聚砜和聚丙烯腈膜比较 ,再生纤维素膜具有良好的耐污染特性 .     

菱沸石分子筛膜的合成调控与气体分离研究进展

菱沸石(Chabazite,CHA)分子筛膜因其八元环小孔(0.38 nm)三维孔道结构、可调的表面特性、较高的材料稳定性与制备可重复性,在轻质气体分离方面具有优异性能,近年来逐渐成为分子筛膜研究热点之一.本综述介绍了两种CHA分子筛膜(SAPO-34膜、SSZ-13膜)的基本特性,对比了CHA分子筛膜的合成方法(原位...     

聚偏氯乙烯超滤膜的辐照接枝改性研究

聚偏氟乙烯超滤膜经Ｃｏ－６０辐照，接枝乙烯基单体，再经磺化，成为磺化聚氟乙烯超滤膜。研究了辐照剂量、接枝时间对接枝率的影响和磺化反应的条件等。试验表明，改性后膜的亲水性和抗污染性增强。此外，还讨论了膜改性的机理。     

An in situ approach to synthesize pure phase FAU-type zeolite membranes: effect of aging and formation mechanism

FAU-type zeolite membranes were prepared on porous α-Al₂O₃ tubes by a two-stage in situ synthesis method. The synthesis was carried out in clear solutions without the aid of seeds or organic templates. The first stage synthesis was devoted to the in situ nucleation of FAU-type zeolite, aiming to induce an evenly covered zeolite layer on the support. In situ aging played an important role at this stage as it suppressed LTA phase and promoted the formation of a continuous zeolite layer. The second stage synthesis was performed in a dilute solution, where the pre-formed zeolite layer went on to grow and became compact. Scanning electron microscopy (SEM) observations show that the membranes were made up of well-shaped intergrown crystals, with the thickness around 7 μm. Pervaporation (a membrane-based separation process in which the liquid components diffuse through a membrane and are subsequently vaporized due to the low-pressure exerted on the permeate side of the membrane) measurements were carried out in a water/ethanol (10/90, w/w) mixture to evaluate the membrane performance. The structural and morphological evolutions of FAU-type zeolite membranes during synthesis were tracked down by X-ray diffraction and SEM. The formation mechanism was illuminated based on the experimental results.