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Influence of Technical Parameters of the Pyrolysis Process on the Surface Area, Porosity, and Hydrophobicity of Biochar from Sunflower Husk Pellet

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  • Katarzyna Wystalska

    (Faculty of Infrastructure and Environment, Czestochowa University of Technology, Dabrowskiego 69, 42-201 Czestochowa, Poland)

  • Anna Kwarciak-Kozłowska

    (Faculty of Infrastructure and Environment, Czestochowa University of Technology, Dabrowskiego 69, 42-201 Czestochowa, Poland)

  • Renata Włodarczyk

    (Faculty of Infrastructure and Environment, Czestochowa University of Technology, Dabrowskiego 69, 42-201 Czestochowa, Poland)

Abstract

Biochar is a product that has been of interest to many researchers in recent years. The use and positive effect of biochar depend on its properties, which in turn result primarily from the type of substrate used for production and the technical parameters of the pyrolysis process used. From the point of view of sustainable development, agricultural raw materials, such as sunflower husks, are good materials for biochar synthesis. The research aimed to determine the effect of changing the technical parameters of the pyrolysis process (i.e., temperature, heating rate, and residence time) on the properties of biochar obtained from sunflower husk pellets. The pellets were heated to 480 °C, 530 °C, and 580 °C. The applied heating rate for 480 °C was 4.00 and 7.38 °C·min −1 , for 530 °C it was 4.42 and 8.15 °C·min −1 and for 580 °C it was 4.83 and 8.92 °C·min −1 . Determining these properties is important due to the use of biochar, e.g., in the processes of sorption of pollutants from the water and soil environment. The technical parameters of the pyrolysis process used allowed us to obtain hydrophilic materials with porosity in the range of 10.11% to 15.43% and a specific surface area of 0.93 m 2 ·g −1 to 2.91 m 2 ·g −1 . The hydrophilic nature of biochar makes it possible to use them in the processes of removing inorganic pollutants and polar organic pollutants. The presence of macropores in biochar may contribute to the improvement of water management in the soil and affect the assimilation of microelements by plants. The low content of heavy metals in biochar does not pose a threat to the environment.

Suggested Citation

  • Katarzyna Wystalska & Anna Kwarciak-Kozłowska & Renata Włodarczyk, 2022. "Influence of Technical Parameters of the Pyrolysis Process on the Surface Area, Porosity, and Hydrophobicity of Biochar from Sunflower Husk Pellet," Sustainability, MDPI, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:394-:d:1015800
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    References listed on IDEAS

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    1. Samar Elkhalifa & Hamish R. Mackey & Tareq Al-Ansari & Gordon McKay, 2022. "Pyrolysis of Biosolids to Produce Biochars: A Review," Sustainability, MDPI, vol. 14(15), pages 1-19, August.
    2. Steiner, Philippe, 2009. "Note from the editor," economic sociology. perspectives and conversations, Max Planck Institute for the Study of Societies, vol. 11(1), pages 1-2.
    3. Agnieszka Klimek-Kopyra & Urszula Sadowska & Maciej Kuboń & Maciej Gliniak & Jakub Sikora, 2021. "Sunflower Husk Biochar as a Key Agrotechnical Factor Enhancing Sustainable Soybean Production," Agriculture, MDPI, vol. 11(4), pages 1-14, April.
    4. Mohammad Ghorbani & Elnaz Amirahmadi & Reinhard W. Neugschwandtner & Petr Konvalina & Marek Kopecký & Jan Moudrý & Kristýna Perná & Yves Theoneste Murindangabo, 2022. "The Impact of Pyrolysis Temperature on Biochar Properties and Its Effects on Soil Hydrological Properties," Sustainability, MDPI, vol. 14(22), pages 1-15, November.
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