Synthesizing high performance robust PSf loose nanofiltration membranes through nanobubble-assisted pore-forming

IF 8.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL Desalination Pub Date : 2024-11-05 DOI:10.1016/j.desal.2024.118274
Zongrui Song , Yujie Wu , Junjie Lv , Yanhong Ji , Mohammad Younas , Benqiao He
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Abstract

Loose nanofiltration (LNF) membranes have extensive applications in precision separation processes, however, synthesizing highly permselective LNF membranes is still a considerable obstacle. Nanobubble-assisted pore-forming method was adapted to prepare a highly perm-selective LNF membrane for the first time in this work, using polysulfone (PSf) as the membrane-forming material, azodicarbonamide (AC) as the reactive pore-forming agents, and NaOH solution as the coagulation and immersion baths. By leveraging nano-bubbles produced through the reaction between AC and NaOH without adding other pore-forming agents, the membrane-forming process of PSf was regulated. It was found that the PSf LNF membranes prepared in NaOH-solution coagulation and immersion baths exhibited significantly enhanced permeation performance without compromising the rejection. These results suggested that the coagulation and immersion post-treatment processes under NaOH solution had a great effect upon the structure and the property of the membranes. The LNF membrane prepared from 20 wt% PSf casting solution with 8 wt% AC achieved a permeation flux of 188.7 L m−2 h−1, and a Congo red (CR, Mw =696 Da) rejection of over 99 %, while a rejection of NaCl below 7 %, showing a good separation for the CR/NaCl mixed solution. Additionally, the membrane exhibited favorable mechanical properties, with a tensile strength as high as 6.5 MPa and a fracture elongation reaching as much as 32.3 %. This work provided a novel approach for producing high-performance LNF membranes in treating dye wastewater.

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通过纳米气泡辅助孔隙形成技术合成高性能坚固的 PSf 松散纳滤膜
松散纳滤膜(LNF)在精密分离过程中有着广泛的应用,然而,合成高周波选择性的LNF膜仍然是一个相当大的障碍。本研究以聚砜(PSf)为成膜材料,偶氮二甲酰胺(AC)为活性成孔剂,NaOH溶液为凝固和浸泡液,首次将纳米气泡辅助成孔法应用于制备高过滤膜。在不添加其他成孔剂的情况下,利用 AC 与 NaOH 反应产生的纳米气泡调节 PSf 的成膜过程。研究发现,在 NaOH 溶液凝固浴和浸泡浴中制备的 PSf LNF 膜的渗透性能显著提高,而排斥性能却没有受到影响。这些结果表明,NaOH 溶液下的凝固和浸泡后处理过程对膜的结构和性能有很大影响。由 20 wt% PSf 铸造溶液和 8 wt% AC 制备的 LNF 膜的渗透通量达到了 188.7 L m-2 h-1,刚果红(CR,Mw =696 Da)的抑制率超过 99%,而 NaCl 的抑制率低于 7%,表明 CR/NaCl 混合溶液的分离效果良好。此外,膜还具有良好的机械性能,抗拉强度高达 6.5 兆帕,断裂伸长率高达 32.3%。这项工作为生产处理染料废水的高性能 LNF 膜提供了一种新方法。
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来源期刊
Desalination
Desalination 工程技术-工程:化工
CiteScore
14.60
自引率
20.20%
发文量
619
审稿时长
41 days
期刊介绍: Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.
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