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首页> 外文期刊>Journal of Environmental Management >Synthesis of high-performance hierarchically porous carbons from rice husk for sorption of phenol in the gas phase
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Synthesis of high-performance hierarchically porous carbons from rice husk for sorption of phenol in the gas phase

机译：稻壳中高性能分层多孔碳的合成气相吸附苯酚

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摘要

Phenol as a semi-volatile organic compound (SVOC) extensively presents in industrial wastewater. Moreover, it is a main compound of tar existing in the vapor phase from biomass pyrolysis or gasification. So far, most of works on the phenol adsorption by activated carbons have been conducted in the liquid phase. However, the adsorption of phenol in the gas phase has not been reported. This work aims to synthesize the hierarchically porous carbons from the unaltered and pelletized rice husk (RH) via a facile pyrolysis followed by the ball-milling-assisted KOH activation. Herein, the silica nanoparticles in RH acted as a self-template to remarkably increase specific surface areas and pores, thereby giving rise to the formation of hierarchically porous carbons, which showed a relatively high adsorption capacity (maximum value: 1919 mg/g) of phenol in the vapor phase. Generally, the process of phenol adsorption onto porous carbons in the gas phase followed with various interactions, including pore filling, electrostatic interaction, hydrophobic effect, and functional groups effect (e.g., pi-pi interaction). And the pseudo-second-order model could well describe the adsorption kinetic. It is noted that the pelletized RH was more favorable to develop the porous carbons with the hierarchically meso-microporous structures that could enhance the transfer of the phenol molecules via the outer layer and subsequent uptake by the adsorption sites on the inner layer. Further, the SVOC phenol was hard to volatilize under ambient conditions due to its relatively higher boiling point (181.7 degrees C), so the thermal desorption was a potential way to regenerate the spent activated biochars.
机译：苯酚作为半挥发性有机化合物（SVOC）在工业废水中广泛呈现。此外，它是来自生物质热解或气化的气相中存在的焦油的主要化合物。到目前为止，大部分作品在液相中已经在液相中进行了活性碳的吸附。然而，尚未报告苯酚的吸附。该工作旨在通过容易聚解，随后是球磨的辅助KOH活化来合成来自未妨碍和造粒的稻壳（RH）的分层多孔碳。在此，RH中的二氧化硅纳米颗粒作用为自模塑模板，以显着增加比表面积和孔，从而产生分层多孔碳的形成，其显示出相对高的吸附能力（最大值：1919 mg / g）苯酚在气相中。通常，苯酚吸附在气相中的多孔碳中，随后具有各种相互作用，包括孔隙填充，静电相互作用，疏水作用和官能团作用（例如，PI-PI相互作用）。伪二阶模型可以很好地描述吸附动力学。应注意，颗粒化的RH更有利地利用分层中间微孔结构开发多孔碳，其可以通过外层增强酚分子的转移并随后通过内层的吸附位点吸收。此外，由于其相对较高的沸点（181.7℃），SVOC苯酚难以在环境条件下挥发挥发，因此热解吸是再生所活化的生物脉的潜在方法。

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  • 来源
    《Journal of Environmental Management》 |2019年第jul1期|53-58|共6页
  • 作者

    Shen Yafei; Zhang Niyu; Fu Yuhong;

  • 作者单位

    Nanjing Univ Informat Sci & Technol Sch Environm Sci & Engn Jiangsu Key Lab Atmospher Environm Monitoring & P Nanjing 210044 Jiangsu Peoples R China;

    Nanjing Univ Informat Sci & Technol Sch Environm Sci & Engn Jiangsu Key Lab Atmospher Environm Monitoring & P Nanjing 210044 Jiangsu Peoples R China;

    Nanjing Univ Informat Sci & Technol Sch Environm Sci & Engn Jiangsu Key Lab Atmospher Environm Monitoring & P Nanjing 210044 Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Semi-volatile phenol; Porous carbon; Rice husk; Sorption; KOH activation;

    机译：半挥发性苯酚;多孔碳;稻壳;吸附;KOH激活;

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