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首页> 外文期刊>RSC Advances >The effects of hydroxyapatite nano whiskers and its synergism with polyvinylpyrrolidone on poly(vinylidene fluoride) hollow fiber ultrafiltration membranes
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The effects of hydroxyapatite nano whiskers and its synergism with polyvinylpyrrolidone on poly(vinylidene fluoride) hollow fiber ultrafiltration membranes

机译：羟基磷灰石纳米晶须及其与聚乙烯吡咯烷酮对聚（偏二氟乙烯）中空纤维超滤膜的影响

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摘要

By introducing hydroxyapatite (HAP) nano whiskers as well as polyvinylpyrrolidone (PVP), poly(vinylidene fluoride) (PVDF)/PVP/HAP hollow fiber membranes were fabricated with the wet spinning method. The aqueous solution containing 90 wt% N-methyl-2-pyrrolidone (NMP) is used as bore liquid. The effects of two additives and the synergism on the morphologies, surface properties, permeation performances, antifouling ability and mechanical properties of the PVDF/PVP/HAP membranes were characterized by numerous state-of-the-art analytical techniques, and reasonably elucidated accompanying with precipitation kinetics and shear viscosity of dopes. The results show that with the addition of HAP, the finger-like structure of PVDF/PVP/HAP membranes is gradually suppressed and replaced by sponge-like structure, and the hydrophilicity is evidently improved. The hydraulic permeability J(w) firstly increases from 224.2 of M-1 to 549.1 L M-2 H-1 bar(-1) by adding 1.0 wt% HAP nano whiskers of M-2, and then decreases to 425.9 and 316.3 L M-2 H-1 bar(-1) for M-3 and M-4. The rejections of three proteins and humic acid range from 31.4% to 98.4%, and slightly decrease as HAP content increases in the membranes. The mechanical properties of the membranes are markedly improved with the addition of HAP nano whiskers. The membranes containing dual additives have higher permeability and mechanical strength than those of the fibers containing either single additive, implying the synergism of them in improving membrane properties.
机译：通过引入羟基磷灰石（HAP）纳米晶须以及聚乙烯吡咯烷酮（PVP），用湿纺丝制备聚（偏二氟乙烯）/ PVP / HAP中空纤维膜。含有90wt％N-甲基-2-吡咯烷酮（NMP）的水溶液用作孔液体。通过许多最先进的分析技术，两种添加剂对形态，表面性质，渗透性能，防污能力和机械性能，以及合理阐明的效果对PVDF / PVP / HAP膜的形态，表面性质，渗透性能，防污能力和力学性能的影响。沉淀动力学和掺杂剪切粘度。结果表明，随着HAP的添加，PVDF / PVP / HAP膜的指状结构逐渐被抑制并用海绵状结构代替，并且可以显然改善了亲水性。液压渗透率J（W）首先通过加入M-2的1.0wt％Hap纳米晶须从224.2的M-1至549.1L m-2 H-1b（-1）增加到425.9和316.3 L. M-2 H-1 Bar（-1）用于M-3和M-4。抑制三种蛋白质和腐殖酸的范围为31.4％至98.4％，并且随着膜中的Hap含量增加而略微降低。随着添加HAP纳米晶须而显着改善膜的机械性能。含有双添加剂的膜具有比含有单一添加剂的纤维的渗透性和机械强度较高，这意味着它们在改善膜性能方面的协同作用。

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