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The preparation of synthetic graphite materials with hierarchical pores from lignite by one-step impregnation and their characterization as dye absorbents

机译：用一步浸渍的褐煤具有分层孔的合成石墨材料的制备及其表征作为染料吸收剂

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摘要

Herein, synthetic graphite materials with hierarchical pores and large specific surface area were successfully prepared by one-step impregnation with lignite as the carbon source, sulfuric acid (H2SO4) as the oxidant, and phosphoric acid (H3PO4) as the activator. The microstructural characteristics of synthetic graphite were investigated via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Moreover, the pore parameters were studied by nitrogen adsorption-desorption. The results showed that synthetic graphite had a perfect orderly layered structure with high graphitization degree and a well-developed multistage pore structure with pore sizes ranging from nanometer to micrometer. The specific surface area and pore volume were 415.29 m(2) g(-1) and 0.67 cm(3) g(-1), respectively. The results of Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) showed that the impregnation pretreatment provided polar groups containing oxygen to the surfaces. These unique characteristics make synthetic graphite possess good adsorption capacity for dye pollutants (the adsorption rate of the methyl orange solution was 99.9% within 60 min at 50 degrees C, and the pH value of the solution was 3). The effects of temperature and pH value on the adsorption capacity were studied. The repeatability of the adsorption performance was also tested, and the adsorption rate was 84.6% of the initial adsorption rate after five cycles.
机译：这里，通过用褐煤作为碳源，硫酸（H2SO4）作为氧化剂，硫酸（H3PO4）作为活化剂，成功地制备具有分层孔和大的比表面积的合成石墨材料。通过X射线衍射（XRD），拉曼光谱，扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了合成石墨的微观结构特性。此外，通过氮吸附 - 解吸研究了孔隙参数。结果表明，合成石墨具有完美有序的分层结构，具有高图石化程度，具有良好的多级孔结构，孔径从纳米到千分尺。比表面积和孔体积分别为415.29m（2 )g（-1）和0.67cm（3 )g（-1）。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）的结果表明，浸渍预处理提供含有氧气的极性基团。这些独特的特性使合成石墨具有良好的染料污染物吸附能力（甲基橙溶液的吸附速率在50摄氏度下60分钟内为99.9％，溶液的pH值为3）。研究了温度和pH值对吸附能力的影响。还测试了吸附性能的可重复性，在五个循环后，吸附速率为初始吸附速率的84.6％。

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  • 来源
    《RSC Advances》 |2019年第22期|共10页
  • 作者

    Qiu Tian; Yang Jian-Guo; Bai Xue-Jie; Wang Yu-Ling;

  • 作者单位

    China Univ Min &

    Technol Natl Engn Res Ctr Coal Preparat &

    Purificat Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Natl Engn Res Ctr Coal Preparat &

    Purificat Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Sch Chem Engn &

    Technol Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Sch Chem Engn &

    Technol Xuzhou 221116 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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