Enhancing the hydrophilic and antifouling properties of polypropylene nonwoven fabric membranes by the grafting of poly(N-vinyl-2-pyrrolidone) via the ATRP method.
Enhancing the hydrophilic and antifouling properties of polypropylene nonwoven fabric membranes by the grafting of poly(N-vinyl-2-pyrrolidone) via the ATRP method.
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DOI：
10.1016/j.jcis.2011.01.094
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发表时间：
2011-05
影响因子：
9.9
通讯作者：
Chanchan Wang;Ranran Feng;Fenglin Yang
中科院分区：
文献类型：
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作者：
Chanchan Wang;Ranran Feng;Fenglin Yang
本文研究了聚乙烯吡咯烷酮（PNVP）改性非织造布（NWF）膜的表面特性及其对膜渗透性能的影响。系统地研究了接枝时间、接枝温度、单体浓度对PNVP接枝率的影响。研究了接枝率对膜表面性能的影响。扫描电子显微镜（SEM）用于表征膜表面的结构和形态变化。水接触角从113±1.2°下降到52±3°，说明随着PNVP接枝度的增加，改性后的NWF亲水性增强。计算了表面自由能，表明改性后表面自由能有所增加。牛血清白蛋白（BSA）的静态吸附实验进行了研究，这表明，82.5%的下降。通过水和活性污泥上清液的渗透实验，研究了活性污泥对胞外聚合物的渗透特性。结果表明，改性后的纳米纤维膜具有较高的渗透通量和较低的通量损失。在引入PNVP后，膜表面上的细菌粘附在很大程度上受到抑制。
In this work, the surface characteristics of poly(N-vinyl-2-pyrrolidone) (PNVP)-modified nonwoven fabric (NWF) membranes and the effects of the surface characteristics on the membranes antifouling properties were investigated. Effects of grafting time, grafting temperature, and monomer concentration on the grafting degree of PNVP were systematically investigated. The effect of grafting degree on the surface characteristics was also investigated. Scanning electron microscopy (SEM) was used to characterize the structural and morphological changes on the membrane surface. The water contact angles decreased from 113±1.2° to 52±3°, which means that the hydrophilicity of the modified NWF was enhanced with increasing PNVP grafting degree. The surface free energy was calculated, which showed an increase after modification. Static bovine serum albumin (BSA) adsorption experiments were carried out, which showed a decrease of 82.5%. Permeation experiments of water and supernatant solution of active sludge were carried out to determine the antifouling characteristics against the extracellular polymeric substance. Results demonstrated that the modified NWF had higher permeation fluxes and lower flux loss in comparison with the original NWF. Bacterial adhesion on the membrane surface was largely suppressed after the introduction of PNVP.