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首页> 外文期刊>Applied Surface Science >An aerogel adsorbent with bio-inspired interfacial adhesion between graphene and MoS_2 sheets for water treatment
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An aerogel adsorbent with bio-inspired interfacial adhesion between graphene and MoS_2 sheets for water treatment

机译：具有生物启发性的石墨烯和MoS_2片材之间界面粘合的气凝胶吸附剂，用于水处理

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摘要

The increasing environmental pollution calls for the development of stable functional materials for efficiently binding contaminants, while they can be synthesized and recycled easily. Herein, a three-dimensional (3D) aerogel is constructed by bio-inspired adhesion of graphene and MoS2 sheets with polydopamine (PDA) through a one-step hydrothermal route for the adsorption of the water-soluble organic contaminants. The impact of the bio-inspired interfacial adhesion on the resulting composite aerogel is thoroughly investigated, e.g., the interfacial PDA layer renders the composite aerogel considerably more porous, together with the much higher specific surface area and pore volume, as well as strikingly smaller average pore size and superior stability upon exposure to air, relative to the counterpart without the bio-inspired adhesion. The 3.2 wt% PDA composition is adequate to yield a composite structure with small MoS2 nanocrystallites uniformly dispersed over the modified graphene surface without aggregation. The adsorption of methylene green onto such a 3D composite architecture is spontaneous and endothermic and obeys the Langmuir isotherm model and pseudo-second-order kinetics, with the maximum adsorption capacities over 200 mg/g at all the operating temperatures and the satisfactory recycling properties without significant degradation after 5 cycles.
机译：日益严重的环境污染要求开发稳定的功能材料，以有效地结合污染物，同时又可以轻松地合成和循环利用污染物。在此，通过石墨烯和MoS2片材与聚多巴胺（PDA）的生物启发粘合，通过一步式水热路径来吸附水溶性有机污染物，从而构建了三维（3D）气凝胶。彻底研究了生物启发的界面粘合对所得复合气凝胶的影响，例如，界面PDA层使复合气凝胶具有更大的多孔性，并具有更高的比表面积和孔体积，以及显着较小的平均数相对于没有生物启发性附着物的接触物，其暴露于空气中时具有较大的孔径和优异的稳定性。 3.2重量％的PDA组合物足以产生具有小的MoS 2纳米微晶的复合结构，所述微细的MoS 2纳米微晶均匀地分散在改性的石墨烯表面上而没有聚集。亚甲基绿在这种3D复合结构上的吸附是自发的并且是吸热的，并且符合Langmuir等温线模型和拟二级动力学，在所有工作温度下的最大吸附容量均超过200 mg / g，并且在不使用任何化学物质的情况下具有令人满意的回收特性5个循环后明显降解。

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  • 来源
    《Applied Surface Science》 |2020年第may15期|145717.1-145717.11|共11页
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  • 作者单位

    Foshan Univ Sch Mat Sci & Energy Engn Foshan 528000 Guangdong Peoples R China;

    Foshan Univ Sch Mat Sci & Energy Engn Foshan 528000 Guangdong Peoples R China|Chinese Acad Sci Guangdong Prov Key Lab New & Renewable Energy Res Guangzhou Inst Energy Convers Guangzhou 510640 Peoples R China|Guangdong Res Inst Petrochem & Fine Chem Engn Guangdong Prov Key Lab Ind Surfactant Guangzhou 510640 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Graphene; MoS2; Aerogel; Composite; Interfacial; Adsorption;

    机译：石墨烯MoS2;气凝胶;综合;界面吸附性;

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