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首页> 外文期刊>Applied Surface Science >Influence of poly(ethylene glycol) as pore-generator on morphology and performance of chitosan/poly(vinyl alcohol) membrane adsorbents
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Influence of poly(ethylene glycol) as pore-generator on morphology and performance of chitosan/poly(vinyl alcohol) membrane adsorbents

机译：聚乙二醇作为成孔剂对壳聚糖/聚乙烯醇膜吸附剂形态和性能的影响

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Macroporous chitosan/poly(vinyl alcohol) membrane adsorbents were synthesized by solvent evaporation in the presence of poly(ethylene glycol) which was utilized as porogen. The membranes were applied for Cu(II) ion adsorption from water. SEM, AFM and wettability analyses were performed for membrane characterization. Insertion of poly(ethylene glycol) generated macrovoids in the dense structure of CS/PVA membranes through particulate leaching out mechanism. According to the static adsorption tests, the uptake capacity of the porous membranes is elevated (～26 mg/g) compared to that of the dense membranes (～10 mg/g). This phenomenon is attributed to the increase in the density of active sites, water affinity and surface roughness as a result of the porogen effects. The approachability of the ions to the active sites was also affected by these important parameters. Both size and density of the macrovoids increased with increasing PEG content from nil to 5 wt%. Fragility of the resultant porous structures prohibited synthesizing CS/PVA membranes with higher porogen contents. Desorption tests showed that the porous membranes were better regenerated in comparison to the dense membranes using Na_2EDTA as eluant. Generally, the results suggested that the CS/PVA membranes, comprising PEG as pore-generator agent, are potential candidates for adsorption and elimination of Cu(II) ions from water.
机译：在用作致孔剂的聚乙二醇存在下，通过溶剂蒸发合成了大孔壳聚糖/聚乙烯醇膜吸附剂。将该膜用于从水中吸附Cu（II）离子。进行SEM，AFM和润湿性分析以表征膜。通过颗粒浸出机制，在CS / PVA膜的致密结构中插入聚乙二醇生成的大孔。根据静态吸附测试，与致密膜（〜10 mg / g）相比，多孔膜的吸收能力有所提高（〜26 mg / g）。这种现象归因于致孔剂效应导致活性位点密度，水亲和力和表面粗糙度增加。这些重要参数还影响了离子与活性位点的可接近性。大孔的尺寸和密度都随着PEG含量从零增加到5wt％而增加。所得多孔结构的易碎性禁止合成具有较高致孔剂含量的CS / PVA膜。解吸测试表明，与使用Na_2EDTA作为洗脱液的致密膜相比，多孔膜的再生效果更好。通常，结果表明，包含PEG作为成孔剂的CS / PVA膜是从水中吸附和消除Cu（II）离子的潜在候选物。

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