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Effect of sodium hypochlorite exposure on polysulfone recycled UF membranes and their surface characterization
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-02-16 , DOI: 10.1016/j.polymdegradstab.2018.02.012
Serena Molina , Junkal Landaburu-Aguirre , Laura Rodríguez-Sáez , Raquel García-Pacheco , José G. de la Campa , Eloy García-Calvo

The present work aims to investigate the effect of chlorine on the surface of the polysulfone (PSF) layer uncovered in the transformed ultrafiltration (UF) membranes (recycled from end-of-life reverse osmosis (RO) membranes). With this purpose, 6 end-of-life RO membranes used previously during their useful life to treat brackish water or seawater were transformed using two higher exposure doses of free chlorine (50,000 and 300,000 ppm h). On one hand, the end-of-life membranes were first characterized in terms of the type of fouling identified by TGA, ICP and bacteria detection. On the other hand, to determine the stability of the PSF layer, the transformed PSF UF membranes were then characterized by means of its permeability and molecular weight cut-off (MWCO). In addition, membrane surface characterization was performed by ATR-FTIR, SEM and AFM. The results show that all the end-of-life RO membranes with organic and inorganic fouling were effectively transformed to PSF UF membranes at the ppm∙h values studied. However, one of the analysed sea water membrane model (HSWC3) showed more resistance to be transformed and the pores of the uncovered PSF layer only appeared at 300,000 ppm h. This membrane showed different surface appearance, with bigger pores after 300,000 ppm h exposure dose that might have affected the PSF UF membrane performance. This study indicates that a complete characterization of transformed PSF UF membrane surface is crucial for a deep understanding of the recycling process of end-of-life membranes.



中文翻译:

次氯酸钠暴露对聚砜回收超滤膜的影响及其表面表征

本工作旨在研究氯对转化超滤(UF)膜(从寿命终止反渗透(RO)膜回收)中未发现的聚砜(PSF)层表面的影响。出于此目的,使用两种较高暴露剂量的游离氯(50,000和300,000 ppm h)对先前在使用寿命内用于处理微咸水或海水的6种报废RO膜进行了转化。一方面,首先根据通过TGA,ICP和细菌检测确定的结垢类型来表征报废膜。另一方面,为了确定PSF层的稳定性,然后通过其渗透性和分子量截留(MWCO)来表征转化的PSF UF膜。另外,通过ATR-FTIR,SEM和AFM进行膜表面表征。结果表明,在研究的ppm∙h值下,所有具有有机和无机结垢寿命的RO膜都可以有效地转化为PSF UF膜。但是,一种分析的海水膜模型(HSWC3)显示出更多的抗转化性,并且未覆盖的PSF层的孔仅在300,000 ppm h时出现。该膜表现出不同的表面外观,在300,000 ppm h的暴露剂量后,孔更大,这可能会影响PSF UF膜的性能。这项研究表明,转化的PSF UF膜表面的完整表征对于深入了解报废膜的回收过程至关重要。但是,一种分析的海水膜模型(HSWC3)显示出更多的抗转化性,并且未覆盖的PSF层的孔仅在300,000 ppm h时出现。该膜表现出不同的表面外观,在300,000 ppm h的暴露剂量后,孔更大,这可能会影响PSF UF膜的性能。这项研究表明,转化的PSF UF膜表面的完整表征对于深入了解报废膜的回收过程至关重要。但是,一种分析的海水膜模型(HSWC3)显示出更多的抗转化性,并且未覆盖的PSF层的孔仅在300,000 ppm h时出现。该膜表现出不同的表面外观,在300,000 ppm h的暴露剂量后,孔更大,这可能会影响PSF UF膜的性能。这项研究表明,转化的PSF UF膜表面的完整表征对于深入了解报废膜的回收过程至关重要。

更新日期:2018-02-16
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