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Electrosorption of Pb(II) in water using graphene oxide-bearing nickel foam as the electrodes

机译：含氧化石墨烯的镍泡沫作为电极对水中Pb（II）的电吸附

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The electrosorption of Pb(II) from water with graphene oxide-bearing nickel foam (GO/NF) as the electrodes was studied in this work in order to develop a more effective method for Pb(II) removal. The GO/NF was synthesized via vacuum impregnation method. The characterization of the materials was performed through atomic force microscopy, adsorption capacity, zeta potential and X-ray photoelectron spectroscopy measurements. The experimental results have shown that a very large adsorption capacity (3690?mg g?1) and high adsorption rate were achieved for electrosorption. The adsorption fitted the Langmuir isotherm and was in good agreement with a pseudo-second-order kinetics model. The mechanism might be attributed to electrosorption and chemisorption, in which the oxygen containing functional groups of graphene oxide offered a large amount of lone pair electrons for complexation with Pb(II) ions and thus enhanced the hydrophilicity of GO/NF electrodes. It has been demonstrated that electrosorption with GO/NF as the electrode could be a very promising process for removing Pb(II) from water.
机译：以含氧化石墨烯的镍泡沫（GO / NF）为电极，研究了水中对Pb（ II ）的电吸附，以期开发出更有效的Pb（ II）方法。 II ）删除。通过真空浸渍法 合成了GO / NF。通过原子力显微镜，吸附容量，ζ电位和X射线光电子能谱测量对材料进行表征。实验结果表明，电吸附具有很高的吸附容量（3690？mg g ？1 ）和高吸附速率。吸附符合朗缪尔等温线，并与拟二级动力学模型良好吻合。该机理可能归因于电吸附和化学吸附，其中氧化石墨烯的含氧官能团提供大量孤对电子以与Pb（ II ）离子络合，从而增强了GO的亲水性/ NF电极。已经证明，以GO / NF为电极进行电吸附是从水中去除Pb（ II ）的非常有前途的过程。

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