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首页> 外文期刊>Environmental Science & Technology >Performance and Mechanism of Uranium Adsorption from Seawater to Poly(dopamine)-lnspired Sorbents
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Performance and Mechanism of Uranium Adsorption from Seawater to Poly(dopamine)-lnspired Sorbents

机译:铀对聚多巴胺激发的吸附剂吸附铀的性能和机理

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摘要

Developing facile and robust technologies for effective enrichment of uranium from seawater is of great significance for resource sustainability and environmental safety. By exploiting mussel-inspired polydopamine (PDA) chemistry, diverse types of PDA-functionalized sorbents including magnetic nanoparticle (MNP), ordered mesoporous carbon (OMC), and glass fiber carpet (GFC) were synthesized. The PDA functional layers with abundant catechol and amine/imine groups provided an excellent platform for binding to uranium. Due to the distinctive structure of PDA, the sorbents exhibited multistage kinetics which was simultaneously controlled by chemisorption and intralayer diffusion. Applying the diverse PDA-modified sorbents for enrichment of low concentration (parts per billion) uranium in laboratory-prepared solutions and unpurified seawater was fully evaluated under different scenarios: that is, by batch adsorption for MNP and OMC and by selective filtration for GFC. Moreover, high-resolution X-ray photoelectron spectroscopic and extended X-ray absorption fine structure studies were performed for probing the underlying coordination mechanism between PDA and U(VI). The catechol hydroxyls of PDA were identified as the main bidentate ligands to coordinate U(VI) at the equatorial plane. This study assessed the potential of versatile PDA chemistry for development of efficient uranium sorbents and provided new insights into the interaction mechanism between PDA and uranium.
机译:开发简便有效的技术以从海水中有效富集铀对资源可持续性和环境安全具有重要意义。通过利用贻贝启发的聚多巴胺(PDA)化学,合成了包括磁性纳米颗粒(MNP),有序介孔碳(OMC)和玻璃纤维毯(GFC)在内的各种类型的PDA功能化吸附剂。具有丰富的儿茶酚和胺/亚胺基的PDA功能层为结合铀提供了极好的平台。由于PDA具有独特的结构,吸附剂表现出多级动力学,同时受化学吸附和层内扩散控制。在不同的情况下,对通过PDA改性的各种吸附剂在实验室制备的溶液和未净化的海水中富集低浓度(十亿分之一)的铀进行了全面评估:即通过分批吸附MNP和OMC,以及通过选择性过滤GFC。此外,进行了高分辨率的X射线光电子能谱和扩展的X射线吸收精细结构研究,以探索PDA和U(VI)之间的潜在配位机理。 PDA的邻苯二酚羟基被确定为在赤道平面上配位U(VI)的主要双齿配体。这项研究评估了通用PDA化学在开发高效铀吸附剂方面的潜力,并为PDA与铀之间的相互作用机理提供了新见解。

著录项

  • 来源
    《Environmental Science & Technology》 |2017年第8期|4606-4614|共9页
  • 作者单位

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, and,Beijing Key Lab of Radioactive Waste Treatment, Tsinghua University, Beijing 100084, China;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology,;

    Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, and,Beijing Key Lab of Radioactive Waste Treatment, Tsinghua University, Beijing 100084, 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);
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  • 正文语种 eng
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