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Evaluation of electrospun polymer-Fe3O4 nanocomposite mats in malachite green adsorption

机译：孔雀石绿色吸附中电纺 - Fe3O4纳米复合垫的评价

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Magnetoactive nanocomposite fibers, based on poly(ethylene oxide) (PEO), poly((L)-lactide) (PLLA) and preformed oleic acid-coated magnetite nanoparticles (OA center dot Fe3O4), were fabricated by electrospinning and evaluated for the first time as substrates for the adsorption of N-methylated diaminotriphenylmethane dye (malachite green oxalate, MG) from aqueous media. The adsorption of MG onto the fibers was investigated under ambient conditions by means of UV-Vis spectrophotometry as a function of initial dye concentration and solution pH. Equilibrium data for MG adsorption were well-fitted with the Langmuir isotherm model indicating a monolayer adsorption process. The effect of magnetite nanoparticles on the adsorption efficacy has been also demonstrated by performing the aforementioned studies on fibers that did not contain OA center dot Fe3O4. The obtained results suggested that the presence of embedded magnetite nanoparticles reduces the fiber adsorption efficiency to some extent. Moreover, the thermodynamic parameters determined from adsorption experiments carried out at three different temperatures indicated that the adsorption of MG onto theFe(3)O(4)-free and the Fe3O4-containing fibers is spontaneous and endothermic. Although the presence of Fe3O4 within the fibers disfavored somewhat the adsorption process, nevertheless, the incorporation of the magnetic nanoparticles within these materials assisted their recovery from aqueous solutions by means of an externally applied magnetic field. Desorption of MG from the fibers could be realized upon fiber immersion in alcohol solution, thus allowing the regeneration and re-use of the adsorbents that retained the same adsorption efficiency after multiple regeneration cycles. MG adsorption studies performed in urban wastewater samples by using the PEO/ PLLA and the PEO/PLLA/OA center dot Fe3O4 fibers as adsorbents, demonstrated the potential use of these materials in real wastewater treatment applications.
机译：基于聚（环氧乙烷）（PEO），聚（（L）丙酸酯）（PLLA）和预先成形的油酸涂覆的磁铁矿纳米粒子（OA中心点Fe3O4），通过静电制造磁体活性纳米复合纤维，并将第一从水性介质中吸附N-甲基化二氨基甲基甲烷染料（孔雀石绿色草酸盐，Mg）的底物的时间。通过UV-Vis分光光度法在环境条件下在环境条件下对Mg的吸附作为初始染料浓度和溶液pH。 Mg吸附的平衡数据良好地配备了Langmuir等温模型，表明单层吸附过程。还通过对不含OA中心点Fe3O4的纤维进行上述研究表明，还证明了磁铁矿纳米粒子对吸附疗效的影响。所得结果表明，嵌入磁铁矿纳米粒子的存在在一定程度上降低了纤维吸附效率。此外，从三种不同温度下进行的吸附实验确定的热力学参数表明，将Mg的吸附到Fe（3）O（4） - 完全和Fe 3 O 4的纤维上是自发的和吸热的。尽管在纤维内的Fe3O4存在的存在有些吸附过程，但是，在这些材料内掺入磁性纳米颗粒辅助通过外部施加的磁场从水溶液中恢复。通过纤维浸入醇溶液中的纤维解吸Mg的解吸可以实现，从而允许再生和重新使用在多个再生循环后保留相同吸附效率的吸附剂。通过使用PEO / PLLA和PEO / PLLA / OA中心点Fe3O4纤维作为吸附剂，在城市废水样品中进行了Mg吸附研究，证明了这些材料在真正的废水处理应用中的潜在使用。

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