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首页> 外文期刊>Journal of Applied Polymer Science >Ultrafiltration of aquatic humic substances through magnetically responsive polysulfone membranes
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Ultrafiltration of aquatic humic substances through magnetically responsive polysulfone membranes

机译：通过磁响应聚砜膜对水类腐殖质进行超滤

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Organic foulants, such as humic acid substances, contribute to the irreversible fouling and flux decline in membrane separation processes. To reduce the membrane fouling potential, in this study, we explored the end-capping of functionalized nanostructured magnetite (Fe3O4) with poly(acrylic acid) (PAA) on the surface of the polysulfone (PSF) membrane. The binding stability of PAA-functionalized Fe3O4 [functionalized magnetite-responsive nanoparticles (F-MNPs)], combined with field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometry, were studied to determine the deposited morphology and magnetic properties of F-MNPs on the membrane surface. In addition, the fouling analysis of the modified (F-MNPs-PSF) and unmodified (PSF) membranes were also being investigated through the filtration study. The results show that the magnetically responsive F-MNPs-PSF membrane developed in this study achieved high efficiency for the removal of humic substances when they were exposed to an oscillating external magnetic field. During filtration, the external magnetic field indirectly generated a torque that twisted the deposited Fe3O4 on the membrane surface. The actuated iron oxides consecutively reduced the concentration polarization around the top surface of the membrane and sequentially reduced the fouling propensity. These results provide some insight into the membrane's antifouling stability, which could be useful for environmental remediation. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41874.
机译：腐殖酸类物质等有机污垢导致膜分离过程中不可逆的污垢和通量下降。为了减少膜污染的可能性，在这项研究中，我们探索了在聚砜（PSF）膜表面上用聚丙烯酸（PAA）对官能化的纳米结构磁铁矿（Fe3O4）进行封端的方法。研究了PAA官能化的Fe3O4的结合稳定性[功能化的磁铁矿响应性纳米颗粒（F-MNPs）]，结合场发射扫描电子显微镜，能量色散X射线光谱法和振动样品磁法研究了沉积形态和F-MNPs在膜表面的磁性此外，还通过过滤研究对改性（F-MNPs-PSF）和未改性（PSF）膜的结垢分析进行了研究。结果表明，在这项研究中开发的磁响应F-MNPs-PSF膜在暴露于振荡的外部磁场中时，去除腐殖质的效率很高。在过滤过程中，外部磁场间接产生扭矩，该扭矩扭曲了膜表面沉积的Fe3O4。活化的氧化铁连续降低了膜顶表面周围的浓差极化，并依次降低了结垢倾向。这些结果为膜的防污稳定性提供了一些见识，这对于环境修复很有用。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41874。

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