A novel TFNi pervaporation membrane with g-C3N4 quantum dots for high-efficiency IPA dehydration

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Pub Date : 2024-10-24 DOI:10.1016/j.memsci.2024.123451

Jia-Rui Yang, Yu-Fei Lin, Zhen-Liang Xu, Rui Jia, Yin-Xin Fang

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Abstract

Pervaporation (PV) shows significant potential for the highly selective isopropanol (IPA). The pursuit of developing PV membranes with outstanding separation effect and enduring high purity permeation is an indispensable goal. Based on polyamide (PA) separation layers, a polydopamine (PDA) mixed g-C₃N₄ quantum dots (gCNQDs) coating as the interlayer was deposited onto a porous ceramic hollow fiber substrate to fabricate thin-film nanocomposite membranes with an interlayer (TFNi). The nanocomposite interlayer enabled the formation of a smoother and highly separated selective polyamide layer. The separation factor exhibited a 31-fold enhancement with the augmentation of the blending fraction of gCNQDs during the PDA coating process. The resulting TFNi membrane attained an exceedingly high separation factor of 10270 ± 90 with a permeate water concentration of 99.9 % and demonstrated a satisfactory flux of 1.40 ± 0.08 kg m⁻² h⁻¹ during the PV process of 90 wt% IPA dehydration at 60 °C. This study presents a fresh perspective on the implementation of nanocomposite interlayers, which is expected to expand the application of high-performance TFNi membranes in PV dehydration processes.

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带有 g-C3N4 量子点的新型 TFNi 渗透膜用于高效 IPA 脱水

渗透（PV）技术在高选择性异丙醇（IPA）方面显示出巨大潜力。开发具有出色分离效果和持久高纯度渗透性的 PV 膜是一个不可或缺的目标。在聚酰胺（PA）分离层的基础上，将聚多巴胺（PDA）混合 g-C3N4 量子点（gCNQDs）涂层作为中间层沉积在多孔陶瓷中空纤维基底上，制备出带有中间层（TFNi）的薄膜纳米复合膜。纳米复合中间层能够形成更平滑、高度分离的选择性聚酰胺层。在 PDA 涂层过程中，随着 gCNQDs 混合比例的增加，分离因子提高了 31 倍。所制备的 TFNi 膜在渗透水浓度为 99.9% 的情况下达到了 10270 ± 90 的超高分离因子，在 60 °C 下 90 wt% IPA 脱水的 PV 过程中，通量达到了令人满意的 1.40 ± 0.08 kg m-2 h-1。这项研究为纳米复合夹层的应用提供了一个全新的视角，有望扩大高性能 TFNi 膜在光伏脱水工艺中的应用。

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来源期刊

Journal of Membrane Science 工程技术-高分子科学

CiteScore

17.10

自引率

17.90%

发文量

1031

审稿时长

2.5 months

期刊介绍： The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.