萃取

Abstract(#br)Silicones have innumerable applications in many areas of life. Polydimethylsiloxane (PDMS), which belongs to the class of silicones, has been extensively used in the field of analytical chemistry owing to its favourable physicochemical properties. The use of PDMS in analytical chemistry gained importance with its application as a stationary phase in gas chromatographic separations.

Abstract(#br)A highly-efficient zeolitic imidazolate framework-8 (ZIF-8) embedded polydimethylsiloxane (PDMS) mixed matrix membrane (MMM) supported by a polyvinylidene fluoride (PVDF) nanofibrous substrate was developed for phenol removal in an aqueous-aqueous membrane extractive process.

In this research, rose oil and rose water were hydro-distilled from the fresh oil-bearing rose flowers (Rosa damascena Mill.) using Clevenger-type apparatus. Rose concretes were extracted from the fresh rose flowers by using non-polar solvents, e.g. diethyl ether, petroleum ether, cyclo-hexane, chloroform and n-hexane, and subsequently by evaporation of the solvents under vacuum. Absolutes were produced from the concretes with ethyl alcohol extraction at -20°C, leaving behind the wax and other paraffinic substances.

开发了4个基于聚二甲基硅氧烷( PDMS )的半互穿网络( semi-IPN )用于极性酚类化合物( log Kow≤3 )的吸附萃取。其制备基于二氢硅基封端的聚二甲基硅氧烷与其同系物二乙烯基发生硅氢化交联反应，然后加入惰性的各种聚乙烯氧化物衍生物( PEO )，通过差示扫描量热仪( DSC )、扫描电子显微镜( SEM )、RAMAN光谱和接触角测量等手段对半IPN的理化性质进行控制，显示了半IPN的均一性和较高的亲水性。在优化的酚类化合物萃取条件下，以液相色谱为分析手段，对极性分析物显示出良好的萃取效果，酚类化合物的相对回收率为69 - 100 %。在PDMS中加入30 %的互穿共聚物PEO / PPO得到较高的保留率。此外，5次吸附/解吸循环导致吸附效率损失5.8 %，表明这些PDMS基IPN相具有良好的稳定性。

开发了4个基于聚二甲基硅氧烷( PDMS )的半互穿网络( semi-IPN )用于极性酚类化合物( log Kow≤3 )的吸附萃取。其制备基于二氢硅基封端的聚二甲基硅氧烷与其同系物二乙烯基发生硅氢化交联反应，然后加入惰性的各种聚乙烯氧化物衍生物( PEO )，通过差示扫描量热仪( DSC )、扫描电子显微镜( SEM )、RAMAN光谱和接触角测量等手段对半IPN的理化性质进行控制，显示了半IPN的均一性和较高的亲水性。在优化的酚类化合物萃取条件下，以液相色谱为分析手段，对极性分析物显示出良好的萃取效果，酚类化合物的相对回收率为69 - 100 %。在PDMS中加入30 %的互穿共聚物PEO / PPO得到较高的保留率。此外，5次吸附/解吸循环导致吸附效率损失5.8 %，表明这些PDMS基IPN相具有良好的稳定性。