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<p>Vehicle gasoline emissions are an important source of volatile organic compounds (VOC), contributing to the formation of smog and other air pollutants with adverse effects on human health and the environment. Automotive canisters present ineffective adsorption and desorption of gasoline emissions because of the diffusional limitations of microporous activated carbon (AC). Therefore, the development of feasible adsorbents with both effective gas adsorption and highly regenerative ability is necessary. This study shows that carbon nanofibers (CNFs) synthesized by chemical vapor deposition (CVD) at 600&#xa0;°C on a lignocellulosic waste biochar (BCA600-1pTT) reach faster adsorption and desorption of aliphatic and aromatic VOCs as model gasoline emissions in a packed-bed system. The growth of CNFs during the CVD process resulted in significant surface area enhancement, from 1 to 300 m<sup>2</sup>&#xa0;g<sup>−1</sup>. While BCA600-1pTT demonstrated comparable adsorption capacities for pentane, hexane, and benzene to a microporous AC, its regenerative performance was markedly superior, exhibiting only a 10% capacity loss compared to a substantial 50% reduction for the AC. BCA600-1pTT maintained consistent benzene adsorption performance over four cycles, whereas AC showed a significant drop from the second cycle. This superior performance is linked to the presence of basic functional groups and accessible adsorption sites. Two main diffusion steps in the adsorption process were identified through analysis of the dynamic adsorption data, which was best fit by the Wang and Yoon-Nelson models (<i>R</i><sup>2</sup> &gt; 0.81). BCA600-1pTT displayed notable adsorption effectiveness and regenerative potential for replacing AC in automotive canisters.</p> Graphical abstract <p></p>

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Superior dynamic adsorption-desorption of a valorized lignocellulosic waste composite enhanced with carbon nanofibers for gasoline emissions control: regenerative fixed bed and modeling

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Joel Gutierrez-Martinez,
  • Carlos E. Flores-Chaparro,
  • Jose Rene Rangel-Mendez

摘要

Vehicle gasoline emissions are an important source of volatile organic compounds (VOC), contributing to the formation of smog and other air pollutants with adverse effects on human health and the environment. Automotive canisters present ineffective adsorption and desorption of gasoline emissions because of the diffusional limitations of microporous activated carbon (AC). Therefore, the development of feasible adsorbents with both effective gas adsorption and highly regenerative ability is necessary. This study shows that carbon nanofibers (CNFs) synthesized by chemical vapor deposition (CVD) at 600 °C on a lignocellulosic waste biochar (BCA600-1pTT) reach faster adsorption and desorption of aliphatic and aromatic VOCs as model gasoline emissions in a packed-bed system. The growth of CNFs during the CVD process resulted in significant surface area enhancement, from 1 to 300 m2 g−1. While BCA600-1pTT demonstrated comparable adsorption capacities for pentane, hexane, and benzene to a microporous AC, its regenerative performance was markedly superior, exhibiting only a 10% capacity loss compared to a substantial 50% reduction for the AC. BCA600-1pTT maintained consistent benzene adsorption performance over four cycles, whereas AC showed a significant drop from the second cycle. This superior performance is linked to the presence of basic functional groups and accessible adsorption sites. Two main diffusion steps in the adsorption process were identified through analysis of the dynamic adsorption data, which was best fit by the Wang and Yoon-Nelson models (R2 > 0.81). BCA600-1pTT displayed notable adsorption effectiveness and regenerative potential for replacing AC in automotive canisters.

Graphical abstract