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首页> 外文期刊>Environmental Science & Technology >Dissolved Oxygen and Visible Light Irradiation Drive the Structural Alterations and Phytotoxicity Mitigation of Single-Layer Molybdenum Disulfide
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Dissolved Oxygen and Visible Light Irradiation Drive the Structural Alterations and Phytotoxicity Mitigation of Single-Layer Molybdenum Disulfide

机译：溶解的氧气和可见光照射驱动单层钼二硫化物的结构改变和植物毒性缓解

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摘要

Understanding environmental fate is a prerequisite for the safe application of nanoparticles. However, the fundamental persistence and environmental transformation of single-layer molybdenum disulfide (SLMoS2, a 2D nanosheet attracting substantial attention in various fields) remain largely unknown. The present work found that the dissolution of SLMoS2 was pH and dissolved oxygen dependent and that alterations in phase composition significantly occur under visible light irradiation. The 1T phase was preferentially oxidized to yield soluble species (MoO42- and SO42-), and the 2H phase remained as a residual. The transformed SLMoS2 exhibited a ribbon-like and multilayered structure and low colloidal stability due to the loss of surface charge. Dissolved oxygen competitively captured the electrons of SLMoS2 to generate superoxide radicals and accelerated the dissolution of nanosheets. Compared to pristine 1T-phase SLMoS2, the transformed 2H-phase SLMoS2 could not easily enter algal cells and induced a low developmental inhibition, oxidative stress, plasmolysis, photosynthetic toxicity and metabolic perturbation. The downregulation of amino acids and upregulation of unsaturated fatty acids contributed to the higher toxicity of 1T-phase SLMoS2. The dissolved ions did not induce apparent phytotoxicity. The connections between environmental transformation (phase change and ion release) and phytotoxicity provide insights into the safe design and evaluation of 2D nanomaterials.
机译：了解环境命运是安全应用纳米颗粒的先决条件。然而，单层钼二硫化物的基本持续和环境转化（SLMOS2，在各个领域中吸引大量关注的2D纳米蛋白酶）仍然很大程度上是未知的。本作者发现，SLMOS2的溶解是pH和溶解氧依赖性，并且在可见光照射下显着发生相位组合物的改变。 1T相优选氧化以产生可溶性物质（MOO42-和SO42-），并且将2H相保持残余物。转化的SLMOS2由于表面电荷的损失而表现出带状状和多层结构和低胶体稳定性。溶解氧竞争地捕获SLMOS2的电子以产生超氧化物自由基并加速纳米片的溶解。与原始的1T相单位2相比，转化的2H相SLMOS2不能容易进入藻类细胞并诱导抑制较低的发育抑制，氧化应激，等离子体解，光合毒性和代谢扰动。氨基酸的下调和不饱和脂肪酸的上调有助于1T相SLMOS2的毒性较高。溶解的离子没有诱导表观植物毒性。环境转化（相变离子释放）与植物毒性之间的连接提供了对2D纳米材料的安全设计和评估的见解。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7759-7769|共11页
  • 作者

    Zou Wei; Zhou Qixing; Zhang Xingli; Hu Xiangang;

  • 作者单位

    Henan Normal Univ Key Lab Yellow River & Huai River Water Environm Henan Key Lab Environm Pollut Control Sch Environm Minist Educ Xinxiang 453007 Henan Peoples R China;

    Nankai Univ Key Lab Pollut Proc & Environm Criteria Tianjin Key Lab Environm Remediat & Pollut Contro Minist Educ Coll Environm Sci & Engn Tianjin 300350 Peoples R China;

    Henan Normal Univ Key Lab Yellow River & Huai River Water Environm Henan Key Lab Environm Pollut Control Sch Environm Minist Educ Xinxiang 453007 Henan Peoples R China;

    Nankai Univ Key Lab Pollut Proc & Environm Criteria Tianjin Key Lab Environm Remediat & Pollut Contro Minist Educ Coll Environm Sci & Engn Tianjin 300350 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);
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