...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental research >Removal and recovery of silver nanoparticles by hierarchical mesoporous calcite: Performance, mechanism, and sustainable application
【24h】

Removal and recovery of silver nanoparticles by hierarchical mesoporous calcite: Performance, mechanism, and sustainable application

机译：通过等级介孔方解石去除和恢复银纳米粒子：性能，机制和可持续应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The widespread use of silver nanoparticles (AgNPs) inevitably leads to the environmental release of AgNPs. The released AgNPs can pose ecological risks because of their specific toxicity. However, they can also be used as secondary sources of silver metal. Herein, hierarchical mesoporous calcite (HMC) was prepared and used to remove and recover AgNPs from an aqueous solution. The batch experiments show that the HMC has high removal percentages for polyvinylpyrrolidone- and poly (vinyl alcohol)-coated AgNPs (PVP- and PVA-AgNPs) over a wide pH range of 6-10. The adsorption isotherms indicate that the maximum removal capacities are 55 and 19 mg g~(-1) for PVP-AgNPs and PVA-AgNPs, respectively, corresponding to partition coefficients (PCs) of 0.55 and 0.77 mg g~(-1) μM~(-1). Furthermore, the removal performance is also not impaired by coexisting anions, such as Cl~-, NO_3~-, SO_4~(2-), and CO_3~(2-). Their removal mechanisms can be ascribed to the electrostatic attraction and chemical adsorption between the HMC and polymer-coated AgNPs. Calcium ions on the HMC surface serve as active sites for coordination with the oxygen-bearing functional groups of AgNP coatings. Moreover, the AgNPs adsorbed onto HMC show high catalytic activity and good reusability for the reduction of the organic pollutant 4-nitrophenol. This work may pave the way not only to remove metal nanopollutants from waters but also to convert them into functional materials.
机译：银纳米颗粒（AgNP）的广泛使用不可避免地导致agnps的环境释放。由于其特异性毒性，释放的agnps可能会造成生态风险。然而，它们也可以用作银金属的二级来源。在此，制备分层介孔方解石（HMC）并用于从水溶液中除去并回收AgNP。批量实验表明，HMC在6-10的宽pH范围内具有高于聚乙烯基吡咯烷酮和聚（乙烯醇）涂覆的AgNP（PVP和PVA-AgNP）的高分子均次数。吸附等温线表明，对于PVP-AgNP和PVA-AGNP，最大去除容量分别为55和19mg g〜（-1），对应于0.55和0.77mg g〜（-1）μm的分区系数（PC） 〜（-1）。此外，除去性能也不会通过共存阴离子（例如Cl〜 - ，NO_3〜 - ，SO_4〜（2-）和CO_3〜（2-）损害。它们的去除机制可以归因于HMC和聚合物涂覆的agnps之间的静电吸引和化学吸附。 HMC表面上的钙离子用作与AgNP涂层的含氧官能团配位的活性位点。此外，吸附到HMC上的酰度显示出高催化活性和用于减少有机污染物4-硝基苯酚的良好可重用性。这项工作可能铺平不仅可以从水中取出金属纳米污染物，而且还可以将它们转化为功能材料。

著录项

  • 来源
    《Environmental research》 |2020年第8期|109699.1-109699.11|共11页
  • 作者

    Wei Yin; Meng Liu; Tian-Lei Zhao; Fei-Jin Qian; Han Li; Qi-Zhi Yao; Sheng-Quan Fu; Gen-Tao Zhou;

  • 作者单位

    CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China;

    School of Chemistry and Materials Science University of Science and Technology of China Hefei 230026 China;

    Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China CAS Center for Excellence in Comparative Planetology University of Science and Technology of China Hefei 230026 China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanopollutant; Polymer-coated AgNP; CaCO_3; Adsorption; Catalysis;

    机译：纳米污染物;聚合物涂层agnp;Caco_3;吸附;催化;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号