Effect of Nanopatterning on Concentration Polarization during Nanofiltration.

Effect of Nanopatterning on Concentration Polarization during Nanofiltration.
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DOI:
10.3390/membranes11120961
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发表时间:
2021-12-07
期刊:
影响因子:
4.2
通讯作者:
Weinman ST
Weinman ST
中科院分区:
工程技术4区
文献类型:
--
作者:
Ward LM;Fickling BG;Weinman ST

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用于脱盐的膜在操作期间仍然面临挑战。这些挑战之一是盐离子在膜表面的积累。这被称为浓差极化,并且它对膜的水渗透性和盐截留率具有负面影响。为了减少浓差极化,将线槽纳米图案应用于纳滤膜(NF)。使用硫酸钠(Na2SO4)水溶液来测试原始膜和图案化膜两者的截留率和渗透率。结果表明,纳米粒子的存在不仅没有降低膜表面的浓差极化,反而增加了膜表面的浓差极化。基于这些研究,不同的图案的形状和大小应进行调查,以获得一个基本的了解图案的大小和形状对浓差极化的影响。
Membranes used for desalination still face challenges during operation. One of these challenges is the buildup of salt ions at the membrane surface. This is known as concentration polarization, and it has a negative effect on membrane water permeance and salt rejection. In an attempt to decrease concentration polarization, a line-and-groove nanopattern was applied to a nanofiltration (NF) membrane. Aqueous sodium sulfate (Na2SO4) solutions were used to test the rejection and permeance of both pristine and patterned membranes. It was found that the nanopatterns did not reduce but increased the concentration polarization at the membrane surface. Based on these studies, different pattern shapes and sizes should be investigated to gain a fundamental understanding of the influence of pattern size and shape on concentration polarization.
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