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Interaction Between Graphene Oxide Nanoparticles and Quartz Sand

机译：氧化石墨烯纳米颗粒与石英砂的相互作用

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摘要

In this study, the influence of pH, ionic strength (I_S), and temperature on graphene oxide (GO) nanoparticles attachment onto quartz sand were investigated. Batch experiments were conducted at three controlled temperatures (4, 12, and 25 ℃) in solutions with different pH values (pH 4,7, and 10), and ionic strengths (I_S= 1.4,6.4, and 21.4 mM), under static and dynamic conditions. The surface properties of GO nanoparticles and quartz sand were evaluated by electrophoretic mobility measurements. Derjaguin-Landau-Verwey-Overbeek (DLVO) potential energy profiles were constructed for the experimental conditions, using measured zeta potentials. The experimental results showed that GO nanoparticles were very stable under the experimental conditions. Both temperature and pH did not play a significant role in the attachment of GO nanoparticles onto quartz sand. In contrast, I_S was shown to influence attachment The attachment of GO particles onto quartz sand increased significantly with increasing I_S. The experimental data were fitted nicely with a Freundlich isotherm, and the attachment kinetics were satisfactorily described with a pseudo-second-order model, which implies that the quartz sand exhibited substantial surface heterogeneity and mat GO retention was governed by chemisorption. Furthermore, thermodynamic analysis revealed that the attachment process was nonspontaneous and endothermic, which may be associated with structural changes of the sand surfaces due to chemisorption. Therefore, secondary minimum interaction may not be the dominant mechanism for GO attachment onto the quartz sand under the experimental conditions.
机译：在这项研究中，研究了pH，离子强度（I_S）和温度对氧化石墨烯（GO）纳米颗粒附着在石英砂上的影响。在静态下，在具有不同pH值（pH 4,7和10）和离子强度（I_S = 1.4、6.4和21.4 mM）的三个受控温度（4、12和25℃）下进行批处理实验。和动态条件。 GO纳米粒子和石英砂的表面性能通过电泳迁移率测量进行了评估。使用测量的zeta电位，针对实验条件构建了Derjaguin-Landau-Verwey-Overbeek（DLVO）势能曲线。实验结果表明，GO纳米颗粒在实验条件下非常稳定。温度和pH值在将GO纳米颗粒附着到石英砂上时都没有发挥重要作用。相反，I_S被证明会影响附着力。随着I_S的增加，GO颗粒在石英砂上的附着力显着增加。实验数据与Freundlich等温线很好地吻合，并且使用拟二级模型令人满意地描述了附着动力学，这表明石英砂表现出明显的表面非均质性，并且GO GO保留受化学吸附控制。此外，热力学分析表明，附着过程是非自发的和吸热的，这可能与由于化学吸附作用而引起的沙子表面结构变化有关。因此，在实验条件下，次要最小相互作用可能不是GO附着在石英砂上的主要机制。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13413-13421|共9页
  • 作者

    Nikolaos P. Sotirelis; Constantinos V. Chrysikopoulos;

  • 作者单位

    School of Environmental Engineering, Technical University of Crete, 73100 Chania, Greece;

    School of Environmental Engineering, Technical University of Crete, 73100 Chania, Greece;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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