The role of membrane ξ-potential in solute rejection by low-pressure reverse osmosis membrane
The role of membrane ξ-potential in solute rejection by low-pressure reverse osmosis membrane
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膜电位在低压反渗透膜截留溶质中的作用
DOI：
10.2166/ws.2002.0186
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Huafang Li
中科院分区：
文献类型：
--
作者：
H. Ozaki;Norihito Ikejima;S. Matsui;Y. Terashima;S. Takeda;I. Tari;Huafang Li
新一代的反渗透膜，低压反渗透（LPRO）膜，已经开发出在非常低的压力（低于0.5 MPa）下运行。LPRO膜特别因其在水和废水处理领域中的应用而受到关注，以在低操作压力下提供高水通量，同时保持非常好的盐和有机物截留水平。我们以前对LPRO的研究表明，一些无机盐和有机化合物的截留率明显取决于本体溶液的pH值，这可能是因为LPRO膜可能带有电荷。在这项研究中，我们通过实验研究了不同的LPRO膜在分离无机盐和有机化合物从具有不同pH条件的本体溶液中的有效性。我们还尝试用流动电位法测量细胞膜电位.结果表明，膜电位和有机物的离子大小或分子量是影响膜对离子盐和游离有机物（包括农药和内分泌干扰物）截留率的关键因素。
A new generation of reverse osmosis membranes, low-pressure reverse osmosis (LPRO) membranes, have been developed for operation under very low pressure (below 0.5 MPa). LPRO membranes have received attention especially for their application in the field of water and wastewater treatment, to provide a high water flux at low operating pressure while maintaining very good rejection levels of salts and organics. Our previous work on LPRO has shown that the rejection of some inorganic salts and organic compounds depends appreciably on the pH of the bulk solution, probably because LPRO membranes can have an electric charge. In this study we investigated experimentally the effectiveness of different LPRO membranes in separating inorganic salts and organic compounds from a bulk solution with different pH conditions. We also tried to measure membrane ξ-potential by using a streaming potential method. The results indicated that the membrane ξ-potential as well as the ion size or molecular weight of organics can be considered key factors in the rejection of ionic salts and dissociated organic compounds including pesticides and endocrine disruptors.