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首页> 外文期刊>Applied Surface Science >Surface modification of commercial seawater reverse osmosis membranes by grafting of hydrophilic monomer blended with carboxylated multiwalled carbon nanotubes
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Surface modification of commercial seawater reverse osmosis membranes by grafting of hydrophilic monomer blended with carboxylated multiwalled carbon nanotubes

机译：通过将亲水性单体与羧化多壁碳纳米管共混来接枝商业海水反渗透膜

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In this study, modification of commercial seawater reverse osmosis membranes was carried out with simultaneous use of surface grafting and nanoparticle incorporation. Membrane grafting with a hydrophilic acrylic acid monomer and thermal initiator was used to increase membrane surface hydrophilicity. The used nanomaterial was carboxylated multiwalled carbon nanotubes (MWCNT5), which were dispersed in the grafting solution and deposited on membrane surface to reduce fouling by creating polymer brushes and hydrodynamic resistance. Effectiveness of the grafting process (formation of graft layer on membrane surface) was proved by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analyses. Increase of membrane surface hydrophilicity was approved with contact angle test. First, the grafting was performed on the membrane surfaces with different monomer concentrations, various contact times and several membrane curing times (three variables for optimization). The modified membranes were tested by a cross-flow setup using saline solution for permeability and rejection tests, and bovine serum albumin (BSA) solution for fouling test. The results showed that the modified membranes with 0.75 M of monomer, 3 min contact time and 80 min curing time in an oven at 50 degrees C presented the highest flux and lowest rejection decline related to the commercial reverse osmosis membrane. In the next step, the optimum grafting condition was selected and the nanotubes with different weight percentages were dispersed in the acrylic acid monomer solution. The membrane containing 0.25 wt% COOH-MWCNTs showed the highest fouling resistance. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项研究中，在同时使用表面接枝和纳米粒子掺入的情况下，对商业海水反渗透膜进行了改性。用亲水性丙烯酸单体和热引发剂进行的膜接枝可增加膜表面的亲水性。所使用的纳米材料是羧化多壁碳纳米管（MWCNT5），它们分散在接枝溶液中并沉积在膜表面，以通过形成聚合物刷和增加流体动力学阻力来减少结垢。通过傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析证明了接枝过程（在膜表面上形成接枝层）的有效性。膜表面亲水性的增加通过接触角测试得到认可。首先，在具有不同单体浓度，各种接触时间和几次膜固化时间的膜表面上进行接枝（三个变量进行优化）。改质膜通过错流装置进行测试，其中使用盐溶液进行渗透性和排斥测试，使用牛血清白蛋白（BSA）溶液进行结垢测试。结果表明，与0.75毫升的单体，3分钟的接触时间和80分钟的固化时间在50摄氏度的烤箱中的改性膜相比，商业化的反渗透膜具有最高的通量和最低的拒收率下降。在下一步中，选择最佳的接枝条件，并将具有不同重量百分比的纳米管分散在丙烯酸单体溶液中。含有0.25wt％COOH-MWCNT的膜显示出最高的抗污性。 （C）2016 Elsevier B.V.保留所有权利。

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