Xiaochan An*, Yaxin Xiang, Sijia Ming, Ke Zhang, Hongbing Luo, Liangqian Fan, Wancen Xie and Jinsong He*,
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引用次数: 0
摘要
薄膜复合(TFC)膜是纳滤工艺中最先进的膜。通过界面聚合形成的 TFC 膜聚酰胺活性层和制造过程中的温度控制对膜的渗透选择性起着重要作用。然而,目前尚未对膜生产车间常用的环境温度进行系统研究。在此,我们在 10 至 25 °C 的环境温度范围内,分别在水相与有机相之间的自由界面和传统的 PES 支撑界面上制造了聚酰胺层。我们分别使用红外热成像仪和扫描电镜对自由界面和支撑界面上的聚酰胺形态进行了观察。我们发现,环境温度的微小变化就能使聚酰胺从脊状形态转变为气泡状形态。此外,随着制造过程的温度从 10 ℃ 升高到 25 ℃,纯水渗透率下降了 38.94%,而一元选择性则提高了 12.04 倍。这些研究结果表明,无论是在初始选址还是膜生产稳定性方面,都应充分考虑并合理利用膜企业的日常环境温度,以降低生产成本。此外,还可以通过膜生产车间的温度控制来调整 TFC 膜的渗透选择性。
The Permeability-Selectivity of Polyamide-Based Membranes: Role of Ambient Temperature in the Interfacial Polymerization
The thin-film composite (TFC) membrane is the state-of-art membrane for the nanofiltration process. The polyamide active layer of the TFC membrane formed through interfacial polymerization and temperature control during the fabrication process plays an important role in membrane permeability-selectivity. However, the commonly used ambient temperature in membrane production workshops has not been studied systematically. Here, under an ambient temperature range from 10 to 25 °C, we fabricated polyamide layers on a free interface between the aqueous phase and organic phase and on the traditional PES support interface, respectively. We observed polyamide morphologies using the infrared thermal imager for the free interface and SEM for the support interface, respectively. We found that a minor change in ambient temperature could switch the polyamide from a ridge-like to bubble-like morphology. Moreover, with increasing the temperature of the fabrication process from 10 to 25 °C, the pure water permeance exhibited a decline of 38.94%, and the monodivalent selectivity presented a 12.04-fold increase. These findings highlight that the daily ambient temperature of membrane-based enterprises should be fully considered and reasonably used to decrease the production costs in both initial site selection and membrane production stability. Additionally, the permeability-selectivity of the TFC membrane could be tailored through temperature control in a membrane production workshop.
期刊介绍:
Environmental Science & Technology Letters serves as an international forum for brief communications on experimental or theoretical results of exceptional timeliness in all aspects of environmental science, both pure and applied. Published as soon as accepted, these communications are summarized in monthly issues. Additionally, the journal features short reviews on emerging topics in environmental science and technology.