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首页> 外文期刊>RSC Advances >An l-cystine/l-cysteine impregnated nanofiltration membrane with the superior performance of an anchoring heavy metal in wastewater
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An l-cystine/l-cysteine impregnated nanofiltration membrane with the superior performance of an anchoring heavy metal in wastewater

机译：一种L-胱氨酸/ L-半胱氨酸浸渍的纳滤膜，具有锚固重金属在废水中的优异性能

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摘要

Considerable efforts are being made to develop new materials and technologies for the efficient and fast removal of toxic ions in drinking water. In this work, we developed a sulfur-complexed strategy to enhance the removal capability of heavy metal ions using the polyamide nanofiltration membrane by the covalent anchoring of l-cystine and l-cysteine. The sulfur-functionalized polyamide nanofiltration membrane exhibits superior complexation of heavy metal ions and can efficiently remove them from high-concentration wastewater. As a result, the sulfur-functionalized nanofiltration membrane not only showed excellent desalination performance but also achieved a record removal rate of heavy metal ions (99.99%), which can effectively reduce Hg(ii) concentration from 10 ppm to an extremely low level of 0.18 ppb, well below the acceptable limits in drinking water (2 ppb). Moreover, the sulfur-functionalized nanofiltration membrane showed an exciting long-term stability and can be easily regenerated without significant loss of Hg(ii) removal efficiency even after six cycles. Such outstanding performances were attributed to the synthetic effect of Hg-S coordinative interaction, electrostatic repulsion, and the sieving action of nanopores. These results highlight the tremendous potential of thiol/disulfide-functionalized NF active layer as an appealing platform for removing heavy metal ions from polluted water with high performance in environmental remediation.
机译：正在进行相当大的努力，为饮用水中有效和快速地去除有毒性离子的新材料和技术。在这项工作中，我们开发了一种硫复合的策略，以通过L-胱氨酸和L-半胱氨酸的共价锚固来增强使用聚酰胺纳米过滤膜的重金属离子的去除能力。硫磺官能化聚酰胺纳滤膜具有优异的重金属离子络合，可以有效地从高浓度废水中取出它们。结果，硫磺官能化的纳滤膜不仅显示出优异的脱盐性能，而且还实现了重金属离子的记录去除率（99.99％），其可以有效地将Hg（II）浓度从10ppm浓度降低到极低水平0.18 ppb，远低于饮用水中可接受的限制（2 ppb）。此外，硫磺官能化的纳滤膜显示出激发的长期稳定性，并且可以容易地再生，而不会显着损失Hg（ii）即使在六个循环之后的去除效率。这种出色的表现归因于HG-S协调相互作用，静电排斥和纳米孔的筛分作用的合成效果。这些结果突出了硫醇/二硫键官能化NF活性层作为吸引平台的巨大电位，用于从污染水中除去重金属离子，在环境修复中具有高性能。

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  • 来源
    《RSC Advances》 |2020年第6期|共12页
  • 作者

    Zhang Hong-Li; Cai Huaqiang; Xia Yu; Zhang Pan; Xiong Si-Wei; Gai Jing-Gang;

  • 作者单位

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Sichuan Peoples R China;

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Sichuan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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