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首页> 外文期刊>Separation and Purification Technology >Development of adsorption and electrosorption techniques for removal of organic and inorganic pollutants from wastewater using novel magnetite/porous graphene-based nanocomposites
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Development of adsorption and electrosorption techniques for removal of organic and inorganic pollutants from wastewater using novel magnetite/porous graphene-based nanocomposites

机译：用新型磁铁矿/多孔石墨烯基纳米复合材料去除废水中除去有机和无机污染物的吸附和吸热技术

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Herein, we report a new synthesis route for generating porous on graphene with a scalable and controllable size of micron to submicron through the successive insertion of potassium atoms into interlayers of graphite at low temperature. Comprehensive studies such as physico-chemical analysis confirm that the as-obtained porous graphene has few layers with fewer defects. Further, the magnetically separable magnetite (Fe3O4)/porous graphene nanocomposites were synthesized through a facile, cost-effective hydrothermal process. The as-prepared nanocomposites were characterized by different analytical techniques. In the nanocomposites, superparamagnetic Fe3O4 nanoparticles with an average size of 30 nm nanoparticles uniformly dispersed on the porous graphene sheets, and they acted as mutual spacers in the nanocomposites to avoid aggregation of the magnetic nanoparticles and restacking of the porous graphene layers. In addition, Fe3O4/porous graphene nanocomposites possessed high adsorption capacities of dyes and heavy weight metal ions from wastewater. An organic dye methyl violet was used as an adsorbate for investigating the adsorption characteristics of the Fe3O4/porous graphene nanocomposites. Fe3O4/porous graphene exhibited rapid adsorption (5 min), high adsorption capacity (Q(o)-460 mg/g), easy separation and reuse owing to the high specific surface area with porous nature of graphene and high magnetic property of Fe3O4 nanoparticles. Also, the nanocomposite used as an ultrahigh performance of novel capacitive deionization electrodes (CDI) for removal of Pb2+ and Cu2+ ions at constant applied potential 1.2 V and constant flow rate 4 ml/min. The results indicate that the Fe3O4/graphene nanocomposites exhibit an ultrahigh electrosorption for Pb2+, Cu2+ and Cd2+ ions. The progress made so far will guide further development of graphene based nanostructures with porous and exploration of such porous nanomaterials in environmental remediation toward removal of organic and inorganic contaminants. (C) 2017 Elsevier B.V. All rights reserved.
机译：在此，我们报告了一种新的合成途径，用于在石墨烯上产生多孔，通过连续插入钾原子在低温下将钾原子连续插入亚微米至亚微米。诸如物理化学分析等综合研究证实，AS获得的多孔石墨烯具有少数层，缺陷较少。此外，通过容易的，经济高效的水热法合成磁性可分离磁铁矿（Fe3O4）/多孔石墨烯纳米复合材料。通过不同的分析技术表征为制备的纳米复合材料。在纳米复合材料中，具有平均尺寸的30nm纳米颗粒的超顺磁Fe3O4纳米颗粒均匀地分散在多孔石墨烯片上，并且它们用作纳米复合材料中的互相浇口，以避免磁性纳米颗粒的聚集并重新包装多孔石墨烯层。此外，Fe3O4 /多孔石墨烯纳米复合材料具有来自废水的染料和重量重的金属离子的高吸附能力。使用有机染料甲基紫作为吸附物，用于研究Fe3O4 /多孔石墨烯纳米复合材料的吸附特性。 Fe3O4 /多孔石墨烯表现出快速吸附（5分钟），高吸附容量（Q（o）-460mg / g），由于具有较高的Feformity面积，具有Fe3O4纳米颗粒的高磁性性质的高比表面积，易于分离和重用。此外，纳米复合材料用作新型电容式去离子电极（CDI）的超高性能，以在恒定施加电位的恒定施加电位1.2V下除去PB2 +和Cu2 +离子，恒定流速4mL / min。结果表明Fe3O4 /石墨烯纳米复合材料表现出PB2 +，Cu2 +和CD2 +离子的超高电吸收。到目前为止所取得的进展将引导基于石墨烯基纳米结构的进一步发展，其具有对环境修复中的这种多孔纳米材料的多孔和探索去除有机和无机污染物。 （c）2017 Elsevier B.v.保留所有权利。

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