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天然有机物对水中氧化石墨烯凝聚的影响

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方华, 章婷婷, 于江华, 赵怡. 天然有机物对水中氧化石墨烯凝聚的影响[J]. 环境化学, 2019, 38(6): 1251-1257. doi: 10.7524/j.issn.0254-6108.2018082902
引用本文: 方华, 章婷婷, 于江华, 赵怡. 天然有机物对水中氧化石墨烯凝聚的影响[J]. 环境化学, 2019, 38(6): 1251-1257. doi: 10.7524/j.issn.0254-6108.2018082902
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FANG Hua, ZHANG Tingting, YU Jianghua, ZHAO Yi. Effect of natural organic matters on aggregation of graphene oxide in aqueous systems[J]. Environmental Chemistry, 2019, 38(6): 1251-1257. doi: 10.7524/j.issn.0254-6108.2018082902
Citation: FANG Hua, ZHANG Tingting, YU Jianghua, ZHAO Yi. Effect of natural organic matters on aggregation of graphene oxide in aqueous systems[J]. Environmental Chemistry, 2019, 38(6): 1251-1257. doi: 10.7524/j.issn.0254-6108.2018082902
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天然有机物对水中氧化石墨烯凝聚的影响

  • 1.

    南京信息工程大学环境科学与工程学院, 大气环境与装备技术协同创新中心, 南京, 210044;

  • 2.

    江苏省大气环境监测与污染控制高技术研究重点实验室, 南京, 210044

  • 基金项目:

    国家自然科学基金（41401546）资助.

Effect of natural organic matters on aggregation of graphene oxide in aqueous systems

  • 1.

    Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China;

  • 2.

    Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing, 210044, China

  • Fund Project: Supported by the National Natural Science Foundation of China (41401546).

  • 摘要: 在比较不同片径氧化石墨烯（graphene oxide，GO）稳定性的基础上，研究了3种典型天然有机物对水中GO凝聚的影响.结果表明，不同片径的GO在水中均呈现较强的电负性，小片径GO可更为稳定的分散.电解质加入可降低GO表面电位，诱发纳米颗粒间碰撞凝聚.水中GO的凝聚过程符合胶体稳定性（DLVO）理论，可分为扩散控制凝聚和反应控制凝聚两个不同阶段.Ca2+可通过吸附电中和机制进一步降低GO表面电位，具有更强的促凝聚作用.天然有机物的存在可抑制GO的凝聚；与海藻酸钠相比，富里酸和腐殖酸易被GO吸附，抑制凝聚的能力更强.Ca2+与腐殖酸间可发生配位桥连作用，形成尺寸较大的产物，强化GO凝聚的快速进行.不同天然有机物与GO和电解质间存在着复杂的相互作用关系，对水中GO凝聚的影响存在着较大的差异.
    Abstract: Based on the comparison of the stability of graphene oxide (GO) with different diameters, the effects of three typical natural organic matters (NOM) on the aggregation of GO in aqueous systems were investigated. A strong electronegativity appeared in all the GO samples, meanwhile, the smaller diameters the more stable for the GO samples. Electrolytes induced the GO aggregation by depressing the surface potential. The aggregation of GO was divided into two stages of diffusion limited aggregation and reaction limited aggregation, which were consistent with classic Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Ca2+ had a stronger effect to promote GO aggregation than Mg2+, because Ca2+ could further reduce the surface potential of GO through charge neutralization. The presence of NOM inhibited the aggregation of GO by electrolytes. Fulvic acid (FA) and Humic acid (HA), which were easily adsorbed by GO, showed stronger inhibition on GO aggregation than alginate. Nevertheless, the coordination bridge between Ca2+ and HA resulted in the formation of larger size products which could accelerate the aggregation of GO. The effects of various NOM on GO aggregation were different, due to the complicated interactions among NOM, GO and electrolytes in aqueous systems.
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  • 收稿日期:  2018-08-29
  • 刊出日期:  2019-06-15

天然有机物对水中氧化石墨烯凝聚的影响

  • 1.  南京信息工程大学环境科学与工程学院, 大气环境与装备技术协同创新中心, 南京, 210044;
  • 2.  江苏省大气环境监测与污染控制高技术研究重点实验室, 南京, 210044
  • 收稿日期:  2018-08-29
基金项目:

国家自然科学基金（41401546）资助.

摘要: 在比较不同片径氧化石墨烯（graphene oxide，GO）稳定性的基础上，研究了3种典型天然有机物对水中GO凝聚的影响.结果表明，不同片径的GO在水中均呈现较强的电负性，小片径GO可更为稳定的分散.电解质加入可降低GO表面电位，诱发纳米颗粒间碰撞凝聚.水中GO的凝聚过程符合胶体稳定性（DLVO）理论，可分为扩散控制凝聚和反应控制凝聚两个不同阶段.Ca2+可通过吸附电中和机制进一步降低GO表面电位，具有更强的促凝聚作用.天然有机物的存在可抑制GO的凝聚；与海藻酸钠相比，富里酸和腐殖酸易被GO吸附，抑制凝聚的能力更强.Ca2+与腐殖酸间可发生配位桥连作用，形成尺寸较大的产物，强化GO凝聚的快速进行.不同天然有机物与GO和电解质间存在着复杂的相互作用关系，对水中GO凝聚的影响存在着较大的差异.

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