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首页> 外文期刊>Separation and Purification Technology >Fabrication and characterization of a novel polyvinyl alcohol-graphene oxide-sodium alginate nanocomposite hydrogel blended PES nanofiltration membrane for improved water purification
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Fabrication and characterization of a novel polyvinyl alcohol-graphene oxide-sodium alginate nanocomposite hydrogel blended PES nanofiltration membrane for improved water purification

机译：新型聚乙烯醇 - 石墨烯氧化物 - 藻酸钠纳米复合水凝胶混合PES纳米过滤膜的制备和表征，提高水净化

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摘要

Novel asymmetric microporous polyethersulfone (PES)/polyvinyl alcohol-graphene oxide-sodium alginate (PVA-GO-NaAlg) nanocomposite hydrogel (HG) blended nanofiltration membranes with preferable characteristics were fabricated with the phase inversion induced by immersion precipitation technique. The hydrophilic PVA-GO-NaAlg nanocomposite hydrogel with carboxyl, hydroxyl, carboxylate ions and epoxy groups was in situ formed by chemical crosslinking in presence of the saturated boric acid and CaCl2 curing solution and characterized with SEM, XRD and FTIR analyses. Distinct quantities of the nanocomposite hydrogel were applied in the PES doping solutions for modifying membrane characteristics and the results were compared by pristine PES and PES/polyvinyl pyrrolidone (PVP) membranes. The prepared membranes characterization was performed using SEM, AFM, ATR-FTIR, water contact angle, overall porosity and mean pore radius measurement. Pure water flux, antifouling ability and dye rejection properties were also studied. By HG concentrations enhancement up to 1 wt%, the permeability of the membranes were improved and also antifouling ability of membranes were improved. The hydrogel blended membranes showed Lanasol blue 3R dye rejection more than 83%. Results of comparing PVP additive with HG indicated that the HG could increase hydrophilic property of membrane and result in permeability and antifouling ability improvement. On the other hand, the PVP additive has effective efficiency in membranes porosity and permeability improvement. Hence, the membrane by 1 wt% PVP and 1 wt % HG was fabricated for studying the coupling effect of these two additives, which indicated better solution flux and antifouling properties.
机译：用浸渍沉淀技术诱导的相倒反应制备新的非对称微孔聚醚砜（PES）/聚乙烯醇 - 石墨烯氧化钠（PVA-GO-NAALG）纳米复合水凝胶（HG）混合纳米过滤膜。通过化学交联在饱和硼酸和CaCl2固化溶液存在下，具有羧基，羟基，羧酸甲酯离子和环氧基团的亲水性PVA-GOALG纳米复合水凝胶原位，并用SEM，XRD和FTIR分析表征。在PES掺杂溶液中施加不同量的纳米复合水凝胶，用于改性膜特性，并通过原始PE和PES /聚乙烯吡咯烷酮（PVP）膜比较结果。使用SEM，AFM，ATR-FTIR，水接触角，总孔隙度和平均孔径测量进行制备的膜表征。还研究了纯净的水通量，防污能力和染料排斥性能。通过HG浓度增强至1wt％，改善了膜的渗透性，并且还改善了膜的防污能力。水凝胶混纺膜显示Lanasol蓝3R染料排斥抑制超过83％。 PVP添加剂与HG比较结果表明，HG可以增加膜的亲水性，导致渗透性和防污能力改进。另一方面，PVP添加剂具有有效的膜孔隙率和渗透性改善的效率。因此，制备膜1wt％pvp和1wt％hg，用于研究这两种添加剂的偶联效果，这表明了更好的溶液通量和防污性能。

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