Preparation of PDMS membrane using water as solvent for pervaporation separation of butanol-water mixture
Preparation of PDMS membrane using water as solvent for pervaporation separation of butanol-water mixture
复制标题
水为溶剂制备PDMS膜用于丁醇-水混合物渗透汽化分离
DOI：
10.1039/c3gc40291f
复制
发表时间：
2013-01-01
期刊：
影响因子：
9.8
通讯作者：
Tan, Tianwei
中科院分区：
文献类型：
--
作者：
Li, Shufeng;Qin, Fan;Tan, Tianwei
聚二甲基硅氧烷（PDMS）膜因其在分离有机-有机液体混合物以及去除水和土壤中的挥发性有机化合物方面的潜在应用而受到越来越多的关注。但传统的制备过程中普遍使用大量的正己烷、正庚烷等溶剂。本研究旨在提供一种以水为溶剂，在表面活性剂（十二烷基苯磺酸，DBSA）存在下，低污染、高效的制备方法。通过扫描电子显微镜（SEM）、原子力显微镜（AFM）、衰减全反射傅里叶变换红外（FTIR-ATR）光谱和渗透蒸发（PV）实验对传统方法和绿色方法单独制备的膜进行了比较。结果表明，它们在前三个方面表现基本相同，但在光伏实验中表现出明显不同的特性。采用绿色方法制备的PDMS膜在55℃分离1.5wt%正丁醇水溶液时，相对于传统方法制备的膜，其分离因子提高了30-53%，而总通量仅降低了7-10%。这些性能改进是由于正己烷含量减少而导致蒸发时间缩短的结果。此外，使用绿色方法制备的膜的性能从交联密度、水接触角和溶胀度（SD）角度证实了这一假设。与之前有关PDMS膜PV性能的报道的比较表明，绿色方法不仅环境友好且具有经济竞争力，而且还可以提高PV性能。
Polydimethylsiloxane (PDMS) membrane has attracted increasing attention due to its potential application in separating organic-organic liquid mixtures and removing volatile organic compounds from water and soil. However, solvents like n-hexane, n-heptane and others are generally used in large amounts during its traditional preparation process. This study aimed to provide a low-pollution and high-efficiency preparation method using water as a solvent in the presence of surfactant (dodecylbenzene sulfonic acid, DBSA). Comparisons between the membranes prepared separately with the traditional method and the green method were conducted by scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflection Fourier transform infrared (FTIR-ATR) spectroscopy and pervaporation (PV) experiments. The results showed that they performed basically the same in the first three aspects but displayed markedly different characteristics in the PV experiments. The separation factors of the PDMS membranes prepared using the green method for separating 1.5 wt% n-butanol aqueous solution at 55 degrees C increased by 30-53% relative to those of membranes prepared using the traditional method, while the total flux only decreased by 7-10%. These performance improvements resulted from the shortening of evaporation time induced by the decrease of n-hexane content. Further, this hypothesis was confirmed by the performance of membranes prepared using the green method, from angles of crosslinking density, water contact angle and swelling degree (SD). Comparison with previous reports on PV performance of PDMS membranes implied that the green method was not only environment-friendly and economically competitive but also led to enhanced PV performance.