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Alginate affects agglomeration state and uptake of ~(14)C-labeled few-layer graphene by freshwater snails: Implications for the environmental fate of graphene in aquatic systems

机译:海藻酸盐影响团聚状态和淡水蜗牛对〜(14)C标记的几层石墨烯的吸收:对石墨烯在水生系统中的环境命运的影响

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摘要

Understanding of the interaction of graphene with natural polysaccharides (e.g., alginate) is crucial to elucidate its environmental fate. We investigated the impact of alginate on the agglomeration and stability of C-14-labeled few-layer graphene (FLG) in varying concentrations of monovalent (NaCI) and divalent (CaCl2) electrolytes. Enhanced agglomeration occurred at high CaCl2 concentrations (= 5 mM) due to the alginate gel networks formation in the presence of Ca2+. FLG enmeshed within extended alginate gel networks was observed under transmission electron microscope and atomic force microscope. However, background Na+ competition for binding sites with Ca2+ at the alginate surfaces shielded the gelation of alginate. FLG was readily dispersed by alginate under environmentally relevant ionic strength conditions (i.e., 200 mM Na+ and 5 mM Ca2+). In comparison with the bare FLG, the slow sedimentation of the alginate-stabilized FLG (158 a) caused continuous exposure of this nano material to freshwater snails, which ingested 1.9 times more FLG through filter-feeding within 72 h. Moreover, surface modification of FLG by alginate significantly increased the whole-body and intestinal levels of FLG, but reduced the internalization of FLG to the intestinal epithelial cells. These findings indicate that alginate will act as a stabilizing agent controlling the transport of FLG in aqueous systems. This study also provides the first evidence that interaction of graphene with natural polysaccharides affected the uptake of FLG in the snails, which may alter the fate of FLG in aquatic environments. (C) 2017 Elsevier Ltd. All rights reserved.
机译:了解石墨烯与天然多糖(例如藻酸盐)的相互作用对于阐明其环境命运至关重要。我们研究了藻酸盐对C-14标记的几层石墨烯(FLG)在不同浓度的单价(NaCl)和二价(CaCl2)电解质中的聚集和稳定性的影响。由于在存在Ca2 +的情况下藻酸盐凝胶网络的形成,在高CaCl2浓度(> = 5 mM)下发生了增强的团聚。在透射电子显微镜和原子力显微镜下观察到FLG渗入扩展藻酸盐凝胶网络。然而,背景Na +竞争藻酸盐表面上与Ca 2+的结合位点屏蔽了藻酸盐的胶凝。在环境相关的离子强度条件下(即<200 mM Na +和<5 mM Ca2 +),藻酸盐很容易通过藻酸盐分散FLG。与裸露的FLG相比,藻酸盐稳定的FLG的缓慢沉积(158a)导致该纳米材料持续暴露于淡水蜗牛中,而淡水蜗牛在72小时内通过滤食进食的FLG量是其的1.9倍。此外,藻酸盐对FLG的表面修饰显着增加了FLG的全身和肠道水平,但减少了FLG在肠道上皮细胞中的内在化。这些发现表明藻酸盐将作为稳定剂来控制FLG在水性系统中的运输。这项研究还提供了第一个证据,表明石墨烯与天然多糖的相互作用会影响蜗牛体内FLG的吸收,这可能会改变水生环境中FLG的命运。 (C)2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Environmental pollution》 |2018年第3期|513-522|共10页
  • 作者单位

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, 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
  • 中图分类
  • 关键词

    Graphene; Sodium alginate; Agglomeration; Biological uptake; Freshwater snail;

    机译:石墨烯;藻酸钠;团聚;生物吸收;淡水蜗牛;
  • 入库时间 2022-08-17 13:25:45

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