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首页> 外文期刊>Desalination and water treatment >Hydrophilic modification of polytetrafluoroethylene flat membranes coated by acrylic acid water-absorbent resin
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Hydrophilic modification of polytetrafluoroethylene flat membranes coated by acrylic acid water-absorbent resin

机译：丙烯酸吸水树脂包覆的聚四氟乙烯平膜的亲水改性

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摘要

To improve hydrophilicity and anti-fouling property of the polytetrafluoroethylene (PTFE) flat microfiltration (MF) membrane, a facile method was developed to modify the membrane via the post-cross-linking reaction of polyacrylic acid (PAA) and trimethylolpropane tris-(2-methyl-1-aziri-dinepropionate) (Sac-100) followed by soaking NaHCO3 saturated solution. The surface chemical composition, surface morphology, hydrophilicity and filtration performance of the PTFE flat membrane were examined by XPS, ATR-FTIR, FESEM, water contact angle and pure water flux measurements, respectively. The results showed the hydrophilic groups such as carbonyl (C=O), hydroxyl (-OH) and carboxylic ion (-COO-) were observed on the surface of modified membrane, it can be seen as a water-absorbent resin system. After choosing this low-cost and simple modification method, the PTFE flat membrane was endowed with excellent hydrophilicity, high water permeation flux. Then, effects of surface modified conditions on membrane hydrophily were studied systematically. The anti-fouling tests were conducted using the modified PTFE flat membranes, results showed the modified PTFE flat membranes possess excellent bovine serum albumin (BSA) fouling resistance. Finally, the surface stability of the modified membrane was studied and the modified membranes showed stability under the acidic condition but weak to strong alkali. Therefore, this facile strategy holds attractive potential practical application in water environmental remediation, for example, treatment of medical wastewater.
机译：为了提高聚四氟乙烯（PTFE）平面微滤（MF）膜的亲水性和防污性能，开发了一种简便的方法来通过聚丙烯酸（PAA）和三羟甲基丙烷tris-（2）的后交联反应对膜进行改性。 -（1-叠氮基-二甲基丙酸丙酯）（Sac-100），然后浸泡NaHCO3饱和溶液。分别通过XPS，ATR-FTIR，FESEM，水接触角和纯水通量测量来检查PTFE扁平膜的表面化学组成，表面形态，亲水性和过滤性能。结果表明，在改性膜表面观察到亲水性基团，如羰基（C = O），羟基（-OH）和羧酸根离子（-COO-），可以看作是一种吸水性树脂体系。在选择了这种低成本，简单的改性方法之后，PTFE扁平膜被赋予了极好的亲水性，高的水渗透通量。然后，系统研究了表面改性条件对膜疏水性的影响。使用改性的PTFE平膜进行了防污测试，结果表明改性的PTFE平膜具有优异的牛血清白蛋白（BSA）防污性。最后，对改性膜的表面稳定性进行了研究，发现改性膜在酸性条件下表现出稳定性，但对弱碱至强碱的影响。因此，这种简便的策略在水环境修复（例如医疗废水的处理）中具有诱人的潜在实际应用。

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