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首页> 外文期刊>Environmental Science & Technology >Heteroaggregation of Graphene Oxide with Nanometer- and Micrometer-Sized Hematite Colloids: Influence on Nanohybrid Aggregation and Microparticle Sedimentation
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Heteroaggregation of Graphene Oxide with Nanometer- and Micrometer-Sized Hematite Colloids: Influence on Nanohybrid Aggregation and Microparticle Sedimentation

机译：纳米和微米级赤铁矿胶体对氧化石墨烯的异质聚集：对纳米杂化聚集和微粒沉降的影响。

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摘要

Heteroaggregation of graphene oxide (GO) with nanometer- and micrometer-sized hematite colloids, which are naturally present in aquatic systems, is investigated in this study. The heteroaggregation rates between GO and hematite nanoparticles (HemNPs) were quantified by dynamic light scattering, while the heteroaggregation between GO and micrometer-sized hematite particles (HemMPs) was examined through batch adsorption and sedimentation experiments. The heteroaggregation rates of GO with HemNPs first increased and then decreased with increasing GO/HemNP mass concentration ratios. The conformation of GO-HemNP heteroag-gregates at different GO/HemNP mass concentration ratios was observed through transmission electron microscopy imaging. Initially, GO underwent heteroaggregation with HemNPs through electrostatic attraction to form primary heteroaggregates, which were further bridged by GO to form bigger clusters. At high GO/HemNP mass concentration ratios where GO outnumbered HemNPs, heteroaggregation resulted in the formation of stable GO-HemNP nanohybrids that have a critical coagulation concentration of 308 mM NaCl at pH 5.2. In the case of HemMPs, GO adsorbed readily on the microparticles and, at an optimal GO/HemMP ratio of ~0.002, the sedimentation of HemMPs was the fastest, most likely because of the formation of "electrostatic patches" leading to favorable aggregation of the microparticles.
机译：在这项研究中，研究了氧化石墨烯（GO）与纳米和微米级赤铁矿胶体的异质聚集体，后者自然存在于水生系统中。 GO和赤铁矿纳米颗粒（HemNPs）之间的杂聚速率通过动态光散射进行定量，而GO和微米级赤铁矿颗粒（HemMPs）之间的杂聚通过批吸附和沉降实验进行检查。随着GO / HemNP质量浓度比的增加，GO与HemNP的杂聚率先增加，然后降低。通过透射电子显微镜成像观察到不同GO / HemNP质量浓度比的GO-HemNP杂合体的构象。最初，GO通过静电吸引与HemNPs进行杂聚，形成主要的杂聚体，再由GO桥接，形成更大的簇。在GO数量超过HemNP的高GO / HemNP质量浓度比下，杂聚导致形成稳定的GO-HemNP纳米杂交体，在pH 5.2时，其临界凝结浓度为308 mM NaCl。在HemMP的情况下，GO容易吸附在微粒上，并且在约0.002的最佳GO / HemMP比下，HemMP的沉积最快，最可能的原因是“静电斑”的形成导致了凝胶的有利聚集。微粒。

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  • 来源
    《Environmental Science & Technology》 |2017年第12期|6821-6828|共8页
  • 作者

    Yiping Feng; Xitong Liu; Khanh An Huynh; J. Michael McCaffery; Liang Mao; Shixiang Gao; Kai Loon Chen;

  • 作者单位

    Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21218-2686, United States,State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China,Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China;

    Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21218-2686, United States;

    Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology, Ho Chi Minh City, Vietnam;

    The Integrated Imaging Center, Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218-2686, United States;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China;

    Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21218-2686, United States;

  • 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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