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<p>Biochar is a long-lived carbon sequestration technology that can be used to face climate change. However, the carbon sequestration potential is strongly related to the stability of carbon in its structure, which directly depends on the pyrolysis conditions. Several indicators are currently used to evaluate the carbon stability of biochar, which can generate conflicting results and make it challenging to analyze carbon credits. In this context, the present study evaluated the effects of the pyrolysis temperature and residence time on the stability of carbon in bamboo biochars. The biochars were produced at temperatures of 300&#xa0;°C, 400&#xa0;°C, 500&#xa0;°C, and 600&#xa0;°C, with residence times of 30&#xa0;min and 2&#xa0;h. The carbon stability was evaluated by several methods, including elemental and proximate analyses, the thermostable fraction, and oxidation resistance, and, finally, the carbon sequestration potential was estimated. The results showed that higher pyrolysis temperatures increased carbon stability. However, residence time effects were more affected when biochars were produced at lower temperatures (&lt; 400&#xa0;°C), with longer residence time (2&#xa0;h) producing more stable biochars. Widely recognized indexes for assessing carbon stability in biochars, such as oxygen/carbon, hydrogen/oxygen ratios, the thermostable fraction, the ratios between volatile matter and fixed carbon, in addition to the fixed carbon content over time, based on the raw material and the type of application, showed high correlation, indicating that they can be used interchangeably. The results of this study highlight the limitations of different carbon stability indices and contribute to a deeper understanding of carbon stability in biochars and the improvement of carbon credit assessment methodologies.</p>

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Stability and carbon sequestration potential of bamboo biochar

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Camila Rodrigues Costa,
  • Anderson Marcos de Souza,
  • Marcela Granato Barbosa dos Santos,
  • Ivan Gabriel Rocha da Silva,
  • Thiago Vinhaes Moraes,
  • Jane Ribeiro dos Santos,
  • Vandui Francisco de Siqueira Dantas,
  • Cícero Célio de Figueiredo

摘要

Biochar is a long-lived carbon sequestration technology that can be used to face climate change. However, the carbon sequestration potential is strongly related to the stability of carbon in its structure, which directly depends on the pyrolysis conditions. Several indicators are currently used to evaluate the carbon stability of biochar, which can generate conflicting results and make it challenging to analyze carbon credits. In this context, the present study evaluated the effects of the pyrolysis temperature and residence time on the stability of carbon in bamboo biochars. The biochars were produced at temperatures of 300 °C, 400 °C, 500 °C, and 600 °C, with residence times of 30 min and 2 h. The carbon stability was evaluated by several methods, including elemental and proximate analyses, the thermostable fraction, and oxidation resistance, and, finally, the carbon sequestration potential was estimated. The results showed that higher pyrolysis temperatures increased carbon stability. However, residence time effects were more affected when biochars were produced at lower temperatures (< 400 °C), with longer residence time (2 h) producing more stable biochars. Widely recognized indexes for assessing carbon stability in biochars, such as oxygen/carbon, hydrogen/oxygen ratios, the thermostable fraction, the ratios between volatile matter and fixed carbon, in addition to the fixed carbon content over time, based on the raw material and the type of application, showed high correlation, indicating that they can be used interchangeably. The results of this study highlight the limitations of different carbon stability indices and contribute to a deeper understanding of carbon stability in biochars and the improvement of carbon credit assessment methodologies.