用水热法在氧化铝陶瓷膜管上原位合成丝光沸石膜

The mordenite membrane was prepared on a α-Al 2O 3 tube by in situ hydrothermal synthesis. The crystallization was carried out at 443 K for 2～4 days. Silica sol and sodium aluminate were used as the sources of silica and alumina, respectively, and tetraethylammonium bromide (TEABr) as the template. The molar composition of the parent solution was 11 4Na 2O∶1 0Al 2O 3∶40SiO 2∶2500H 2O∶1 5TEABr. SEM and XRD were used to characterize the powder product and the composite membrane. The synthesized mordenite membrane proved to be in a full coverage and an excellent intergrowth. The mordenite crystals were about 20～30 μm and the thickness of the mordenite membrane was 30～40 μm. Based on the SEM pictures of the membrane in the early stage of hydrothermal synthesis, a growth model for the mordenite membrane was assumed. At first a gel layer was formed on the surface of the alumina tube. Nucleation took place in the gel layer but not at the interface of the gel layer and bulk solution. The gel layer provided the nutrients for the growth of zeolite crystals. After the gel layer was consumed completely, the zeolite crystals or membrane were exposed to the bulk solution. The membrane separation test on the mordenite membrane showed that the permeances of pure H 2 and N 2 at 298 K were 6 92×10 -7 and 1 81×10 -7 mol/(m 2·s·Pa), respectively. The ideal selectivity of H 2/N 2 was 3 82, which is higher than that of Knudsen mechanism. It suggested that the mordenite membrane had the ability of molecular sieving.     

等离子体聚合在膜分离技术中的应用

等离子体聚合过程就是薄膜形成过程,薄膜直接沉积在底膜表面,等离子体聚合产物通常是交联的,热稳定性好,耐有机溶剂。在等离     

分散支撑液膜体系中Pb2+离子的传输

在现有支撑液膜分离技术的理论研究基础上,探索合适的液膜分离体系,研究了Pb(Ⅱ)在PC-88A-煤油-HCl分散支撑液膜体系中的传输行为;考察了料液pH值、膜溶液与解析剂体积比、解析相中HCl浓度以及Pb(Ⅱ)的起始浓度对Pb(Ⅱ)传输的影响。 结果表明,以HCl为解析剂,料液相pH=5.25、膜溶液与解析剂体积比为160∶40、解析相中HCl浓度为5.00 mol/L时,该分散支撑液膜体系对金属Pb(Ⅱ)具有良好的传输作用。 在选取的最佳传输条件下,料液相中Pb(Ⅱ)的初始浓度为3.00×10-4 mol/L时,传输190 min,传输率可达88.9％,而传统支撑液膜只有72.3％。 分散支撑液膜不仅具有较高的传输效率,而且膜体系稳定,膜的使用寿命长。     

正渗透过程中纳米碳管膜的盐水通道行为

以纳米碳管(CNT)仿生构筑正渗透(FO)膜, 采用分子动力学模拟的方法考察水和盐在由CNT(6,6)、CNT(7,7)、CNT(8,8)、CNT(9,9)、CNT(10,10)、CNT(11,11)等不同尺寸纳米碳管构筑膜中, 于2.5、3.75、5.0mol·L^-1等不同汲取液浓度下的传递行为. 纳秒级的模拟得到水分子在不同尺寸纳米碳管膜内的分布, 水通量的变化以及盐截留等情况. 模拟结果表明, 由CNT(8,8)构筑的正渗透膜表现出优异的通水阻盐性能.     

丙烯腈类共聚物膜用于醇,水分离的研究：Ⅱ.丙烯腈与马来酸酐…

本文采用氧化还原引发体系合成了丙烯腈与马来酸酐共聚物，各首次将此共聚物制成了醇，水分离用的渗透蒸发膜，研究了不同马来酸酐含量的共聚物膜碱中的水解规律，考察了共聚物，料液温度，料液浓度等条件对膜的醇，水分离性能的影响关系以及水解前，后膜性能的变化结果表明，当共聚物中马来酸酐含量大于０．０６９（摩尔分数）时，水解前，后膜性能有很大的变化，分离因子，渗透通量和膜强度都普遍提高。另外，还发现该共聚物膜与其     

大环多元醚在分析化学中的应用

综述了大环多元醚的分析特性及在分析化学中的应用，并对其发展趋势作出展望。     

用液膜分离法对微量锌的分离和富集

就近年来国内外富集分离的方法进行了综述,着重介绍液膜分离法.     

荷电高聚物纳滤膜

本文对荷电聚合物纳纳滤膜的制备、性能及应用进行了全面的介和评述，反映了近年来荷电聚合笺纳滤膜研究的最新进展和动向。