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首页> 外文期刊>Journal of Hazardous Materials >Electrospun SiO_2-MgO hybrid fibers for heavy metal removal: Characterization and adsorption study of Pb(Ⅱ) and Cu(Ⅱ)
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Electrospun SiO_2-MgO hybrid fibers for heavy metal removal: Characterization and adsorption study of Pb(Ⅱ) and Cu(Ⅱ)

机译：电纺除杂重金属的SiO_2-MgO杂化纤维：Pb（Ⅱ）和Cu（Ⅱ）的表征和吸附研究

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摘要

SiO2-MgO hybrid fibers (SMHFs) were fabricated by one-step electrospinning process, characterized, and evaluated in heavy metal adsorption, for the first time. High-pressure steam (HPS) pretreated SMHFs showed high specific surface area (SBET) and large number of surface basic sites accompanied by the crystallization of MgO. The SMHFs showed high affinities for Pb(II) and Cu(II) with the distribution coefficients K-d > 100 L.g(-1) (when pH > 4). Langmuir model and pseudo-second-order kinetic model described the experimental data well, and the maximum adsorption capacities of 787.9 and 493.0 mg.g(-1) for Pb(II) and Cu(II) at 298 K were the highest among those of reported SiO2-MgO adsorbents. Thermodynamics indicated SMHFs had the spontaneous and physicochemical adsorption nature. SMHFs kept good capacities in the presence of interfering substances and retained their reusability. The SMHFs with the superiority of high efficiency, low cost, easy preparation and environmentally benign, have promising applications in wastewater treatment and relative fields.
机译：SiO2-MgO杂化纤维（SMHFs）是通过一步电纺丝工艺制备的，其特征在于其对重金属的吸附并进行了评估。高压蒸汽（HPS）预处理的SMHF表现出高的比表面积（SBET）和大量的表面碱性位点，并伴有MgO的结晶。 SMHF对Pb（II）和Cu（II）表现出高亲和力，分布系数K-d> 100 L.g（-1）（当pH> 4时）。 Langmuir模型和伪二级动力学模型很好地描述了实验数据，在298 K下对Pb（II）和Cu（II）的最大吸附容量为787.9和493.0 mg.g（-1）最高。报告的SiO2-MgO吸附剂的数量。热力学表明SMHF具有自发的和物理化学的吸附性质。 SMHF在存在干扰物质的情况下保持良好的容量，并保持其可重复使用性。具有高效率，低成本，易于制备和环境友好的优点的SMHF在废水处理和相关领域中具有广阔的应用前景。

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