Song Xiaosan, Song Xichen, Zhang Yue, Fan Jishuo
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China.
Polymers (Basel). 2023 Sep 15;15(18):3777. doi: 10.3390/polym15183777.
The hydrophobic nature of inorganic zeolite particles plays a crucial role in the efficacy of mixed matrix membranes (MMMs) for the separation of trichloroethylene (TCE) through pervaporation. This study presents a novel approach to further augment the hydrophobicity of ZSM-5. The ZSM-5 zeolite molecular sieve was subjected to modification using three different silane coupling agents, namely, n-octyltriethoxysilane (OTES), γ-methacryloxypropyltrimethoxysilane (KH-570), and γ-aminopropyltriethoxysilane (KH-550). The water contact angles of the resulting OTES@ZSM-5, KH-570@ZSM-5, and KH-550@ZSM-5 particles exhibited significant increases from 97.2° to 112.8°, 109.1°, and 102.7°, respectively, thereby indicating a notable enhancement in hydrophobicity. Subsequently, mixed matrix membranes (MMMs) were fabricated by incorporating the aforementioned silane-modified ZSM-5 particles into polydimethylsiloxane (PDMS), leading to a considerable improvement in the adsorption selectivity of these membranes towards trichloroethylene (TCE). The findings indicate that the PDMS membrane with a 20 wt.% OTES@ZSM-5 particle loading exhibits superior pervaporation performance. When subjected to a temperature of 30 °C, flow rate of 100 mL/min, and vacuum of 30 Kpa, the separation factor and total flux of a 3 × 10 wt.% TCE solution reach 328 and 155 gm·h, respectively. In comparison to the unmodified ZSM-5/PDMS membrane, the separation factor demonstrates a 41% increase, while the TCE flux experiences a 6% increase. Consequently, this approach effectively enhances the pervaporation separation capabilities of the PDMS membrane for TCE.
无机沸石颗粒的疏水性在混合基质膜（MMM）通过渗透蒸发分离三氯乙烯（TCE）的效能中起着关键作用。本研究提出了一种进一步增强ZSM-5疏水性的新方法。使用三种不同的硅烷偶联剂，即正辛基三乙氧基硅烷（OTES）、γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH-570）和γ-氨丙基三乙氧基硅烷（KH-550）对ZSM-5沸石分子筛进行改性。所得的OTES@ZSM-5、KH-570@ZSM-5和KH-550@ZSM-5颗粒的水接触角分别从97.2°显著增加到112.8°、109.1°和102.7°，从而表明疏水性有显著增强。随后，通过将上述硅烷改性的ZSM-5颗粒掺入聚二甲基硅氧烷（PDMS）中来制备混合基质膜（MMM），从而使这些膜对三氯乙烯（TCE）的吸附选择性有相当大的提高。研究结果表明，负载20 wt.%OTES@ZSM-5颗粒的PDMS膜表现出优异的渗透蒸发性能。在30℃的温度、100 mL/min的流速和30 Kpa的真空度下，3×10 wt.%TCE溶液的分离因子和总通量分别达到328和155 gm·h。与未改性的ZSM-5/PDMS膜相比，分离因子提高了41%，而TCE通量增加了6%。因此，该方法有效地提高了PDMS膜对TCE的渗透蒸发分离能力。
