Effect of pyrolysis and temperature on surface chemical properties of palm, bamboo and cypress biochars
DOI:
https://doi.org/10.22458/urj.v18i1.6499Keywords:
agro-industrial waste, bioeconomy, soil amendment, pyrolysis, aromatic stability, Kon-Tiki kilnAbstract
Introduction: Biochar is a carbonaceous material obtained through the pyrolysis of biomass under oxygen-limited conditions. Its potential for agricultural and environmental applications directly depends on its chemical and structural properties. Pyrolysis temperature and production methods dictate the proportion of oxygenated functional groups, the degree of aromaticity, and mineral content, thus modifying its stability and functionality. Objective: To determine the effect of pyrolysis conditions on the surface chemical properties of biochars derived from oil palm empty fruit bunches, cypress wood, and bamboo. Methods: We used a field-scale kiln (Kon-Tiki) and controlled laboratory conditions (muffle furnace at 400°C, 500°C, 600°C, and 700°C) together with proximal analysis, determination of pH and electrical conductivity, elemental analysis (CHNS/O), zeta potential measurement, Boehm titration, and Fourier-transform infrared spectroscopy (FTIR). Results: Increasing pyrolysis temperature reduced volatile matter while increasing fixed carbon and ash content; pH increased with temperature, whereas field-produced biochars exhibited higher electrical conductivity values. Elemental analysis showed a carbon increase up to 82% and a decrease in oxygen and hydrogen content. Atomic ratios H/Corg and O/Corg decreased progressively, indicating high aromatic stability. Oil palm empty fruit had more nitrogen than bamboo and cypress, with sulfur at trace or undetectable levels. The Zeta potential became less negative at higher temperatures due to surface deoxygenation (confirmed by FTIR and Boehm titration). Biochars retained higher active site density than activated carbon. Conclusions: Laboratory-produced biochars presented more homogeneous properties and structural stability, while field-produced materials exhibited a unique functional duality of a stable core and a reactive periphery. This biochar stands out for its potential nitrogen contribution to the edaphic system.
References
Agweh, K., Snowdon, M. R., Mishra, R. K., Chen, G., Vivekanandhan, S., Mohanty, A. K., & Misra, M. (2024). Production and characterization of waste nutshells derived biocarbon through slow pyrolysis: An investigation on the effects of pyrolysis temperature. Biomass Conversion and Biorefinery, 14(24), 28619–28633. https://doi.org/10.1007/s13399-023-03851-4
Chin-Pampillo, J. S., Alfaro-Vargas, A., Rojas, R., Giacomelli, C. E., Perez-Villanueva, M., Chinchilla-Soto, C., Alcañiz, J. M., & Domene, X. (2021). Widespread tropical agrowastes as novel feedstocks for biochar production: characterization and priority environmental uses. Biomass Conversion and Biorefinery, 11(5), 1775–1785. https://doi.org/10.1007/s13399-020-00714-0
Cornelissen, G., Pandit, N. R., Taylor, P., Pandit, B., Sparrevik, M., & Schmidt, H. P. (2017). Data from: Emissions and char quality of flame-curtain “Kon-Tiki” kilns for farmer-scale charcoal/biochar production [Data set]. Dryad. https://doi.org/10.5061/DRYAD.58M6
Espinoza-Marín, I., Chinchilla-Soto, C., Monge-Muñoz, M., Beita-Sandí, W., & Chin-Pampillo, J. (2026). Producción y caracterización fisicoquímica y textural de biocarbones: influencia del tipo de horno de pirólisis. UNED Research Journal, 18(1), Artículo e6173. https://doi.org/10.22458/urj.v18i1.6173
Farhangi-Abriz, S., & Ghassemi-Golezani, K. (2023). Improving electrochemical characteristics of plant roots by biochar is an efficient mechanism in increasing cations uptake by plants. Chemosphere, 313, 137365. https://doi.org/10.1016/j.chemosphere.2022.137365
Gabhi, R. S., Basile, L., Kirk, D. W., Giorcelli, M., Tagliaferro, A., & Jia, C. Q. (2020). Electrical conductivity of wood biochar monoliths and its dependence on pyrolysis temperature. Biochar, 2(3), 323–335. https://doi.org/10.1007/s42773-020-00056-0
Gamboa-Gamboa, E., & Hernández-Chaverri, R. A. (2025). Potencial de obtención de materiales carbonosos a partir de bambú: caso de Costa Rica. Agronomía Mesoamericana, 36. https://doi.org/10.15517/r68t4z48
Goertzen, S. L., Oickle, A. M & Andreas, H. A. (2010). Standardization of the Boehm titration. Part I. CO2 expulsion and endpoint determination. Carbon, 48(4), 1252–1261. https://doi.org/10.1016/j.carbon.2009.11.050
Hong, M., Zhang, L., Tan, Z., & Huang, Q. (2019). Effect mechanism of biochar’s zeta potential on farmland soil’s cadmium immobilization. Environmental Science and Pollution Research, 26(19), 19738–19748. https://doi.org/10.1007/s11356-019-05298-5
International Biochar Initiative [IBI]. (2015). Standardized product definition and product testing guidelines for biochar that is used in soil. International Biochar Initiative, Version 2.1, 1–47.
Jeffery, S., Abalos, D., Prodana, M., Bastos, A. C., van Groenigen, J. W., Hungate, B. A., & Verheijen, F. (2017). Biochar boosts tropical but not temperate crop yields. Environmental Research Letters, 12(5), 053001.
Lee, J. W., Kidder, M., Evans, B. R., Paik, S., Buchanan, A. C., Garten, C. T., & Brown, R. C. (2019). Proximate analyses for characterising biochars. En B. Singh, M. Camps-Arbestain, & J. Lehmann (Eds.), Biochar: A Guide to Analytical Methods (pp. 9–22). CSIRO Publishing.
Lehmann, J., & Joseph, S. (Eds.). (2015). Biochar for environmental management: Science, technology and implementation (2nd ed.). Routledge. https://doi.org/10.4324/9780203762264
Marhani, Sahur, A., Laban, S. ., & Musa, Y. (2022). Characterization of biochar empty fruit Bunches OPEFB at various temperatures and burning time. Journal of Experimental Biology and Agricultural Sciences, 10(3), 599–606. https://doi.org/10.18006/2022.10(3).599.606
McCall, M. A., Watson, J. S., Tan, J. S. W., & Sephton, M. A. (2025). Biochar stability revealed by FTIR and machine learning. ACS Sustainable Resource Management, 2(5), 842–852. https://doi.org/10.1021/acssusresmgt.5c00104
Merck. (2026). Safety Data Sheet: Activated charcoal powder pro analysis (Art. 2186). Merck KGaA. https://www.merckmillipore.com
Mitchell, P. J., Dalley, T. S. L., & Helleur, R. J. (2013). Preliminary laboratory production and characterization of biochars from lignocellulosic municipal waste. Journal of Analytical and Applied Pyrolysis, 99, 13–24. https://doi.org/10.1016/j.jaap.2012.10.025
Mukherjee, A., Zimmerman, A. R., & Harris, W. (2011). Surface chemistry variations among a series of laboratory-produced biochars. Geoderma, 163(3–4), 247–255. https://doi.org/10.1016/j.geoderma.2011.04.021
Navidi, W. (2006). Estadística para ingenieros y científicos. McGraw-Hill/Interamericana Editores, S.A. de C.V.
Nugroho, F. G., Ansari, A. S., Rochman, N. T., Khadtare, S. S., Sree, V. G., Shrestha, N. K., Hafiyyan, A. F., Im, H., & Ahmed, A. T. A. (2025). Utilizing Indonesian empty palm fruit bunches: Biochar synthesis via temperatures dependent Pyrolysis. Nanomaterials, 15(1), 50. https://doi.org/10.3390/nano15010050
Ok, Y.S., Uchimiya, S.M., Chang, S.X., & Bolan, N. (Eds.). (2015). Biochar: Production, characterization, and applications (1st ed.). CRC Press. https://doi.org/10.1201/b18920
Puma-Vaque, L. H. (2023). Biochar de residuos de Guadua angustifolia Kunth: efecto de la temperatura y el tiempo de residencia en la pirólisis lenta. (Tesis de pregrado). Universidad Regional Amazónica Ikiam, Tena, Ecuador.
Rivera-Prieto, A. M., León-Corredor, C. D., & Villalba-Bareño, O. A. (2021). Montaje del método analítico Boehm, para la determinación de la química superficial en sólidos porosos y aplicación en el estudio de carbones activados obtenidos a partir de cáscara de mangostino [Tesis de pregrado, Universidad Piloto de Colombia]. Repositorio Institucional UniPiloto. http://repository.unipiloto.edu.co/handle/20.500.12277/10294
Rodríguez-Rosales, A. X. (2023). Comportamiento del biocarbón de Cupressus lusitanica (Mill) producido a diferentes temperaturas de pirólisis, Cartago, Costa Rica [Tesis de Licenciatura, Instituto Tecnológico de Costa Rica]. Repositorio Institucional TEC.
Ronsse, F., van Hecke, S., Dickinson, D., & Prins, W. (2013). Production and characterization of slow pyrolysis biochar: Influence of feedstock type and pyrolysis conditions. GCB Bioenergy, 5(2), 104–115. https://doi.org/10.1111/gcbb.12018
Sahoo, S. S., Vijay, V. K., Chandra, R., & Kumar, H. (2021). Production and characterization of biochar produced from slow pyrolysis of pigeon pea stalk and bamboo. Cleaner Engineering and Technology, 3, 100101. https://doi.org/10.1016/j.clet.2021.100101
Singh, B., Camps-Arbestain, M., & Lehmann, J. (2017). Biochar: A guide to analytical methods. In Csiro publishing.
Soto-Muñoz, G., Chin-Pampillo, J. S., Villagra-Mendoza, K., & Chinchilla-Soto, C. (2025). Investigación y uso del biocarbón en Costa Rica. Agronomía Costarricense, 49(2), 2907. https://doi.org/10.15517/sh3x5e25
Spokas, K. A. (2010). Review of the stability of biochar in soils: predictability of O:C molar ratios. Carbon Management, 1(2), 289–303. https://doi.org/10.4155/cmt.10.32
Świechowski, K., Matyjewicz, B., Telega, P., & Białowiec, A. (2022). The influence of low-temperature food waste biochars on anaerobic digestion of food waste. Materials, 15(3), Artículo 945. https://doi.org/10.3390/ma15030945
Syguła, E., Ciolkosz, D., & Białowiec, A. (2024). The significance of structural components of lignocellulosic biomass on volatile organic compounds presence on biochar: A review. Wood Science and Technology, 58(3), 859–886. https://doi.org/10.1007/s00226-024-01557-y
Tomczyk, A., Sokołowska, Z., & Boguta, P. (2020). Biochar physicochemical properties: pyrolysis temperature and feedstock kind effects. Reviews in Environmental Science and Biotechnology, 19(1), 191–215. https://doi.org/10.1007/s11157-020-09523-3
Tsechansky, L., & Graber, E. R. (2014). Methodological limitations to determining acidic groups at biochar surfaces via the Boehm titration. Carbon, 66, 730–733. https://doi.org/10.1016/j.carbon.2013.09.044
Ulate-Molina, R. E., Masís-Meléndez, F., & Villagra-Mendoza, K. (2025). Biocarbón: Importancia como alternativa para el desarrollo sostenible en Costa Rica. Una revisión bibliográfica. E-Agronegocios, 11(1), 66–95. https://doi.org/10.18845/ea.v11i1.7568
Waheed, A., Xu, H., Qiao, X., Aili, A., Yiremaikebayi, Y., Haitao, D., & Muhammad, M. (2025). Biochar in sustainable agriculture and climate mitigation: Mechanisms, challenges, and applications in the circular bioeconomy. Biomass and Bioenergy, 193, 107531. https://doi.org/10.1016/j.biombioe.2024.107531
Zou, X., Debiagi, P., Amjed, M. A., Zhai, M., & Faravelli, T. (2024). Impact of high-temperature biomass pyrolysis on biochar formation and composition. Journal of Analytical and Applied Pyrolysis, 179, Artículo 106463. https://doi.org/10.1016/j.jaap.2024.106463
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