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首页> 外文期刊>Polymer Sciences >Preparation of PDMS/PVDF Composite Pervaporation Membrane Modified with Hydrophobic TiO2 Nanoparticles for Separating Formaldehyde Solution
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Preparation of PDMS/PVDF Composite Pervaporation Membrane Modified with Hydrophobic TiO2 Nanoparticles for Separating Formaldehyde Solution

机译：疏水TiO2纳米粒子改性分离甲醛溶液的PDMS / PVDF复合渗透膜的制备。

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In this paper, polydimethylsiloxane (PDMS) was blended with hydrophobic TiO2 nanoparticles and then coated on top of the polyvinylidene fluoride (PVDF) ultrafiltration membrane to form the (PDMS/TiO2)/PVDF composite membrane. The structure, morphology and physical property of the composite membrane were characterized by FTIR, SEM, contact angle measurement, and dry-wet swelling degree test. The TiO2 was uniformly distributed in the PDMS matrix, and the composite membrane showed higher affinity to formaldehyde than water. The membrane was used to separate the 1000 ppm formaldehyde water solution through a pervaporation (PV) process. The results showed that the membrane could selectively permeate formaldehyde over water and the best separation performance could be achieved at 50°C with a separation factor of 11.25, and a total flux of 187.72 g·m-2·h-1, which were better than the pristine PDMS/PVDF membrane with separation factor of 10.66 and total flux of 115.52 g·m-2·h-1. Hence, adding TiO2 not only increased the membrane flux, but also increased the separation factor of the composite membrane. This study showed that pervaporation technology had the potential for treating formaldehyde wastewater.
机译：在本文中，将聚二甲基硅氧烷（PDMS）与疏水性TiO2纳米颗粒混合，然后涂覆在聚偏二氟乙烯（PVDF）超滤膜的顶部，形成（PDMS / TiO2）/ PVDF复合膜。通过FTIR，SEM，接触角测量和干湿膨胀度测试对复合膜的结构，形貌和物理性能进行表征。 TiO2均匀分布在PDMS基质中，复合膜对甲醛的亲和力高于水。该膜用于通过全蒸发（PV）过程分离1000 ppm甲醛水溶液。结果表明，该膜能选择性地渗透甲醛于水上，在50°C下具有最佳分离性能，分离系数为11.25，总通量为187.72 g·m-2·h-1，较好。比原始PDMS / PVDF膜的分离系数为10.66，总通量为115.52 g·m-2·h-1。因此，添加TiO 2不仅增加了膜通量，而且增加了复合膜的分离系数。这项研究表明，全蒸发技术具有处理甲醛废水的潜力。

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