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首页> 外文期刊>Environmental Science & Technology >Exploring the Aggregation Mechanism of Graphene Oxide in the Presence of Radioactive Elements: Experimental and Theoretical Studies
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Exploring the Aggregation Mechanism of Graphene Oxide in the Presence of Radioactive Elements: Experimental and Theoretical Studies

机译：探索存在放射性元素的氧化石墨烯的聚集机理：实验和理论研究

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摘要

In this study, the aggregation kinetics, aggregate morphology, and aggregation mechanisms of graphene oxide (GO) in the presence of Cs+, Sr2+, UO22+, Eu3+, or Th4+ are characterized by using time-resolved dynamic light scattering, transmission electron microscopy (TEM)-element mapping, redispersion of GO aggregates, and density functional theory (DFT) calculations. The destabilization capability of Cs+, Sr2+, UO22+, Eu3+, and Th4+ and the corresponding values of the critical coagulation concentration (CCC) are obtained for the first time. Polyacrylic acid is used as a dispersant to investigate the reversion of GO aggregates induced by various radioactive elements. The combined results of the poly(acrylic acid) effect and TEM-element mapping show that Cs+ induces the aggregation of GO through electric double-layer suppression and weak binding with oxygen-containing functional groups. By employing DFT calculations, we find that the electrostatic potential distribution and the charge transfer rather than coordination with oxygen-containing functional groups control the destabilizing ability of radioactive elements with a higher valence. A comprehensive process of experimental and theoretical studies is considered to better elucidate the colloidal behavior, self-assembly process, application as a novel adsorbent, and environmental risks of GO.
机译：在这项研究中，通过使用时间分辨动态光散射，透射电子显微镜（TEM）表征了Cs +，Sr2 +，UO22 +，Eu3 +或Th4 +存在下氧化石墨烯（GO）的聚集动力学，聚集形态和聚集机理。 ）元素映射，GO聚合的重新分散以及密度泛函理论（DFT）计算。首次获得Cs +，Sr2 +，UO22 +，Eu3 +和Th4 +的去稳定能力以及相应的临界凝结浓度（CCC）值。聚丙烯酸用作分散剂，以研究各种放射性元素诱导的GO聚集体的还原。聚（丙烯酸）效应和TEM元素映射的综合结果表明，Cs +通过双电层抑制和与含氧官能团的弱结合诱导GO的聚集。通过使用DFT计算，我们发现静电势分布和电荷转移而不是与含氧官能团的配位控制了更高价态的放射性元素的去稳定能力。为了更好地阐明胶体行为，自组装过程，作为新型吸附剂的应用以及GO的环境风险，我们考虑了一个全面的实验和理论研究过程。

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  • 来源
    《Environmental Science & Technology》 |2018年第21期|12208-12215|共8页
  • 作者

    Gao Yang; Chen Ke; Ren Xuemei; Alsaedi Ahmed; Hayat Tasawar; Chen Changlun;

  • 作者单位

    King Abdulaziz Univ, NAAM Res Grp, Jeddah 21589, Saudi Arabia;

    Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, CAS Key Lab Photovolta & Energy Conservat Mat, POB 1126, Hefei 230031, Peoples R China;

    Soochow Univ, Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215123, Peoples R China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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