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Poly(acrylic acid) functionalized magnetic graphene oxide nanocomposite for removal of methylene blue

机译：聚（丙烯酸）官能化磁性石墨烯氧化物纳米复合材料除去亚甲基蓝色

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摘要

A polyacrylic acid (PAA) functionalized magnetic Fe3O4 nanoparticle-graphene oxide nanocomposite (PAA/MGO) was synthesized by a facile method. The structure and surface properties of MGO and PAA/MGO composites were characterized by infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA) and zeta potential measurements. The adsorption of a model dye pollutant, methylene blue (MB), on MGO and PAA/MGO was investigated in batch tests. The functionalization of PAA to MGO significantly enhances the maximum adsorption capacity of MB (at pH = 7) from similar to 70 mg g(-1) (on MGO) to similar to 291 mg g(-1) (PAA/MGO). The adsorption of MB on MGO and PAA/MGO was mainly driven by the electrostatic attraction between positively charged MB molecules and negatively charged nanocomposite surfaces, and the higher adsorption capacity of PAA/MGO is mainly attributed to the functionalization of PAA and its higher content of charged carboxyl groups than MGO. The adsorption capacity of MB on both MGO and PAA/MGO adsorbents also increases with increasing solution pH from 3 to 11, due to enhanced electrostatic attraction at high pH conditions. The limited adsorption capacity of MB on MGO and PAA/MGO at pH 3, when electrostatic attraction is almost negligible, indicates that pi-pi interaction between the GO surface and MB also plays a role in the adsorption process. The PAA/MGO shows a rapid adsorption rate and high adsorption capacity of MB with magnetic properties for easy separation and excellent recyclability, which endows the nanocomposite with great potential for the removal of cationic organic pollutants in wastewater treatment.
机译：通过容易法合成聚丙烯酸（PAA）官能化磁Fe3O4纳米颗粒 - 石墨烯氧化物纳米复合材料（PAA / MgO）。通过红外（IR）光谱，X射线光电子能谱（XPS），高分辨率透射电子显微镜（HRTEM），热重分析（TGA）和Zeta电位测量来表征MgO和Paa / MgO复合材料的结构和表面性质。在分批试验中研究了模型染料污染物，MgO和Paa / MgO上的亚甲基蓝（MB）。 PAA至MgO的官能化显着提高了与类似于291mg（-1）（PAA / MgO）的70mg G（-1）（ON MgO）的Mb（在pH = 7）的最大吸附容量。 MB对MgO和PAA / MgO的吸附主要由带正电荷的MB分子和带负电的纳米复合表面的静电吸引力，Paa / MgO的吸附能力较高归因于PAA的功能化及其较高含量带电羧基比MgO。 MB对MG和PAA / MgO吸附剂的吸附容量随着在高pH条件下增强的静电吸引而增加的溶液pH至11时，也随着溶液pH增加而增加。当静电吸引几乎可以忽略时，MB对mg和PAA / MgO的MB对Mg和Paa / MgO的有限吸附能力，表明GOS表面和MB之间的PI-PI相互作用也起到吸附过程中的作用。 PAA / MgO显示出具有磁性性能的MB的快速吸附速率和高吸附能力，以便于分离和优异的可再循环性，其赋予纳米复合材料具有巨大的潜力，以除去废水处理中的阳离子有机污染物。

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  • 来源
    《RSC Advances》 |2015年第41期|共11页
  • 作者

    Zhang Jiawen; Azam Md. Shafiul; Shi Chen; Huang Jun; Yan Bin; Liu Qingxia; Zeng Hongbo;

  • 作者单位

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

    Univ Alberta Dept Chem &

    Mat Engn Edmonton AB T6G 2V4 Canada;

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  • 正文语种 eng
  • 中图分类 化学;
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