DOI: https://doi.org/10.61435/ijred.2026.62059
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Chemically activated biochar derived from mangrove litter with enhanced CO2 adsorption capacity for carbon sequestration

1Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Tembalang, Semarang, Indonesia

2Center of Advanced Material for Sustainability, Universitas Diponegoro, Tembalang, Semarang, Indonesia

3Department of Chemical Engineering, Universitas Pattimura, Ambon 97134, Indonesia

4 Faculty of Chemical & Process Engineering Technology, Universiti Malaysia Pahang Al-Sultan Abdullah, Pahang, Malaysia

5 School of Chemical Engineering, Universiti Teknologi MARA (UiTM), Malaysia

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Received: 5 Dec 2025; Revised: 18 Jan 2026; Accepted: 10 Feb 2026; Available online: 22 Feb 2026; Published: 1 May 2026.
Editor(s): Editor Office
Open Access Copyright (c) 2026 The Author(s). Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract

Overcoming climate change is crucial to ensure environmental sustainability. This research focuses on the development of chemically activated biochar (CAB) from mangrove litters that can be used for CO2 adsorption, which leads to reducing the impacts of climate change. The synthesisation of CAB was carried out via pyrolysis at 400℃ for 2 hours under nitrogen gas flow, followed by treatment using various activating agents (0.1 M of H2SO4, HCl, KOH, and NaOH) for 2 hours with a biochar-to-solution ratio of 1 g : 4 mL. The activation process was designed to enhance surface area, pore characteristics, and functional groups associated with CO2 adsorption performance. The observation on the characteristics of CAB using Scanning Electron Microscope and Energy Dispersive X-Ray (SEM-EDX), The Brunauer, Emmett, Teller and Barret-Joyner-Halenda (BET-BJH), Fourier Transform Infrared Spectroscopy (FTIR), CHN Analyser, and static batch CO2 adsorption tests shows the ability of CAB in capturing CO2 through several possible mechanism. Among the samples, KOH-activated biochar (B-KOH) exhibited the highest CO2 adsorption capacity, reaching 12.47 mmol CO2 g-1 biochar. This high performance is attributed to a potassium (K) composition of 9.74%, which effectively catalyzed the development of a microporous structure, resulting in a micropore volume of 5.927 x 10-3 cm3/g and an optimized average pore width of 1.543 nm. Furthermore, B-KOH maintained the highest O-H group area (1.533 a.u. x cm-1), enhancing its affinity for CO2 molecules. This research offers an innovative and practical solution to reduce greenhouse gases and is expected to have a significant impact, both locally and globally, in advancing sustainable development.

Keywords: adsorption; biochar; carbon sequestration; chemical activation; mangrove litters

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Section: Int Conf. of Chemical and Material Engineering 2025
Language : EN
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  1. Abbaspour, N., Jordan, C., Tondl, G., Wąsik, P., Gholizadeh, T., Tomasetig, D., Szlęk, A., Pfeifer, C., Harasek, M., Korus, A., & Winter, F. (2025). Activated biochars from heavy metal-contaminated biomass for CO2 capture: Adsorption performance and dominant mechanisms. Journal of CO2 Utilization, 101, 103217. https://doi.org/10.1016/J.JCOU.2025.103217
  2. Adhikari, S., Moon, E., Paz-Ferreiro, J., & Timms, W. (2024). Comparative analysis of biochar carbon stability methods and implications for carbon credits. Science of the Total Environment, 914. https://doi.org/10.1016/j.scitotenv.2023.169607
  3. Agency EP. (2022). Climate Change Indicator: Atmospheric Concentrations of Greenhouse Gases. Climate Change Indicators: Atmospheric Concentrations of Greenhouse Gases | US EPA
  4. Ahuekwe, E. F., Abimbola, B. S., Agwamba, E. C., & Durodola, B. (2025). Characterisation of pristine and KOH-modified rice husk biochars for efficient heavy metal removal in wastewater treatment. Scientific African, 28. https://doi.org/10.1016/j.sciaf.2025.e02678
  5. Alcazar-Ruiz, A., Maisano, S., Chiodo, V., Urbani, F., Dorado, F., & Sanchez-Silva, L. (2024). Enhancing CO2 capture performance through activation of olive pomace biochar: A comparative study of physical and chemical methods. Sustainable Materials and Technologies, 42. https://doi.org/10.1016/j.susmat.2024.e01177
  6. Amalina, F., Razak, A. S. A., Krishnan, S., Sulaiman, H., Zularisam, A. W., & Nasrullah, M. (2022). Biochar production techniques utilizing biomass waste-derived materials and environmental applications – A review. In Journal of Hazardous Materials Advances (Vol. 7). Elsevier B.V. https://doi.org/10.1016/j.hazadv.2022.100134
  7. Amer, N. M., Lohijani, P., Mohammadi, M., & Mohamed, A. R. (2024). Modification of biomass-derived biochar: A practical approach towards development of sustainable CO2 adsorbent. Biomass Conversion and Biorefinery, 14, 7401–7448. https://doi.org/10.1007/s13399-022-02905-3
  8. Ariyanti, D., Nugroho, D., Purbasari, A., Azizah, N. U., Nurwidiyanto, A. R., & Gao, W. (2025). Activated mangrove biochar for sustainable carbon sequestration. E3S Web of Conferences, 655. https://doi.org/10.1051/e3sconf/202565501028
  9. Ariyanti, D., Purbasari, A., Sugianto, D. N., Lesdantina, D., & widiyanti, M. (2024). Rice husk-based magnetic biochar produced via hydrothermal route for petroleum spills adsorption: characterization, adsorption kinetics, and isotherms. Adsorption. https://doi.org/10.1007/s10450-024-00544-w
  10. Baharim, N. H., Sjahrir, F., Mohd Taib, R., Idris, N., & Tuan Daud, T. A. (2023). Removal of Crystal Violet from Aqueous Solution using Post-Treated Activation Biochar Derived from Banana Pseudo Stem. Chemical Engineering Transactions, 98, 45–50. https://doi.org/10.3303/CET2398008
  11. Bakshi, S., Banik, C., & Laird, D. A. (2020). Estimating the organic oxygen content of biochar. Scientific Reports, 10(1). https://doi.org/10.1038/s41598-020-69798-y
  12. Bentley, M. J., Kearns, J. P., Murphy, B. M., & Summers, R. S. (2022). Pre-pyrolysis metal and base addition catalyzes pore development and improves organic micropollutant adsorption to pine biochar. Chemosphere, 286. https://doi.org/10.1016/j.chemosphere.2021.131949
  13. Bhattacharjee, N., Jha, A., & Mukherjee, A. (2025). Functionalization of activated carbon to tailor the textural properties and surface functionalities. In Activated Carbon: Synthesis, Analysis, and Industrial Applications (pp. 81–102). Elsevier. https://doi.org/10.1016/B978-0-12-821996-6.00008-7
  14. Birhanu, A., Hailu, A. M., Worku, Z., Tessema, I., Angassa, K., & Tibebu, S. (2025). Optimization of pyrolysis conditions for Catha edulis waste-based biochar production using response surface methodology. Bioresources and Bioprocessing, 12(1). https://doi.org/10.1186/s40643-025-00866-9
  15. Chen, W., Gong, M., Li, K., Xia, M., Chen, Z., Xiao, H., Fang, Y., Chen, Y., Yang, H., & Chen, H. (2020). Insight into KOH activation mechanism during biomass pyrolysis: Chemical reactions between O-containing groups and KOH. Applied Energy, 278. https://doi.org/10.1016/j.apenergy.2020.115730
  16. Choi, G., Kan, E., Lee, J. H., & Choi, Y. (2024). Insight into the performance and microbial community of anaerobic digestion treating cow manure with a novel iron-functionalized activated biochar. Chemosphere, 364. https://doi.org/10.1016/j.chemosphere.2024.143058
  17. Deng, L., Wu, C., Fu, L., Wang, Y., An, Q., Liu, G., & Wan, C. (2024). Preparation of biochar and its adsorbing performance evaluation in the petroleum hydrocarbon. Biomass Conversion and Biorefinery, 14(21), 26895–26904. https://doi.org/10.1007/s13399-022-03439-4
  18. Duan, D., Lei, P., Lan, W., Li, T., Zhang, H., Zhong, H., & Pan, K. (2021). Litterfall-derived organic matter enhances mercury methylation in mangrove sediments of South China. Science of the Total Environment, 765. https://doi.org/10.1016/j.scitotenv.2020.142763
  19. Faggiano, A., Cicatelli, A., Guarino, F., Castiglione, S., Proto, A., Fiorentino, A., & Motta, O. (2025). Optimizing CO2 capture: Effects of chemical functionalization on woodchip biochar adsorption performance. Journal of Environmental Management, 380, 125059. https://doi.org/10.1016/J.JENVMAN.2025.125059
  20. Feng, Y., Lin, D., Yang, K., & Wu, W. (2024). Desorption hysteresis of antibiotics on biochar produced at high temperature: The role of amine groups and amidation reaction. Science of the Total Environment, 952. https://doi.org/10.1016/j.scitotenv.2024.175998
  21. Fernandes, J. D., de Souza Laurentino, L. G., Chaves, L. H. G., de Andrade, J. N. F., da Silva, A. A. R., Kubo, G. T. M., de Lima, G. S., & de Lima, A. M. (2025). Different biochar: effects on soil fertility and growth of bell pepper[Diferentes biocarvões: efeitos na fertilidade do solo e no crescimento de pimentão]. Revista Caatinga, 38. https://doi.org/10.1590/1983-21252025v3812730rc
  22. Freyre, P., St. Pierre, E., & Rybolt, T. (2023). Carbon Dioxide Capture by Adsorption in a Model Hydroxy-Modified Graphene Pore. International Journal of Molecular Sciences, 24(14). https://doi.org/10.3390/ijms241411452
  23. Guarin, D., Fernandez, A., Benavides, J., & Rangel, N. (2025). Biochar for climate change mitigation and soil health management. In Biochar Ecotechnology for Sustainable Agriculture and Environment (pp. 231–259). Elsevier. https://doi.org/10.1016/B978-0-443-29855-4.00011-4
  24. Hameed, R., Abbas, A., Balooch, S., Khattak Wajid Ali, Nazir, M. M., Naqvi, S., Li, G., & Du, D. (2024). Climate change in interaction with global carbon cycle. In Challenges and Solutions of Climate Impact on Agriculture (pp. 227–257). Elsevier. https://doi.org/10.1016/B978-0-443-23707-2.00009-X
  25. Igalavithana, A. D., Choi, S. W., Shang, J., Hanif, A., Dissanayake, P. D., Tsang, D. C. W., Kwon, J. H., Lee, K. B., & Ok, Y. S. (2020). Carbon dioxide capture in biochar produced from pine sawdust and paper mill sludge: Effect of porous structure and surface chemistry. Science of the Total Environment, 739. https://doi.org/10.1016/j.scitotenv.2020.139845
  26. Jayakumar, M., Hamda, A. S., Abo, L. D., Daba, B. J., Venkatesa Prabhu, S., Rangaraju, M., Jabesa, A., Periyasamy, S., Suresh, S., & Baskar, G. (2023). Comprehensive review on lignocellulosic biomass derived biochar production, characterization, utilization and applications. Chemosphere, 345. https://doi.org/10.1016/j.chemosphere.2023.140515
  27. Kapoor, R. T., Rafatullah, M., Siddiqui, M. R., & Alam, M. (2025). Sequestration of reactive blue 19 dye by nitrogen-doped palm kernel shell biochar: Kinetics, thermodynamics, regeneration potential and phytotoxicity studies. Journal of the Indian Chemical Society, 102(6). https://doi.org/10.1016/j.jics.2025.101749
  28. Komatsu, K., Watanabe, T., Tsuda, Y., & Saitoh, H. (2022). Preparation of Nanoporous Carbon from Rice Husk through Alkali Activation Treatment: a Detailed Mechanistic Investigation. Silicon, 14(14), 9117–9127. https://doi.org/10.1007/s12633-021-01619-x
  29. Kumar, A., Kumari, M., Azim, U., Vithanage, M., & Bhattacharya, T. (2023). Garbage to Gains: The role of biochar in sustainable soil quality improvement, arsenic remediation, and crop yield enhancement. Chemosphere, 344. https://doi.org/10.1016/j.chemosphere.2023.140417
  30. Li, Q. W., Liang, J. F., Zhang, X. Y., Feng, J. G., Song, M. H., & Gao, J. Q. (2021). Biochar addition affects root morphology and nitrogen uptake capacity in common reed (Phragmites australis). Science of the Total Environment, 766. https://doi.org/10.1016/j.scitotenv.2020.144381
  31. Li, W., Wang, J., Chen, X., Mosa, A., Ling, W., & Gao, Y. (2025). Interaction and sorption mechanisms of phthalate plasticizers and Cd2+ on biochar. Environmental Pollution, 373. https://doi.org/10.1016/j.envpol.2025.126176
  32. Liu, P., Sun, S., Huang, S., Wu, Y., Li, X., Wei, X., & Wu, S. (2024). KOH Activation Mechanism in the Preparation of Brewer’s Spent Grain-Based Activated Carbons. Catalysts, 14(11). https://doi.org/10.3390/catal14110814
  33. Liu, X., Li, G., Chen, C., Zhang, X., Zhou, K., & Long, X. (2022). Banana Stem and Leaf Biochar as an Effective Adsorbent for Cadmium and Lead in Aqueous Solution. Scientific Reports , 12(1), 1–14. https://doi.org/10.1038/s41598-022-05652-7
  34. Long, Y., Tian, H., Lee, C. H., Li, H., Zeng, Z., Yang, Z., Zhu, G., Chen, X., & Liu, L. (2025). Competitive adsorption of H2O and CO2 on nitrogen-doped biochar with rich-oxygen functional groups. Separation and Purification Technology, 359. https://doi.org/10.1016/j.seppur.2024.130476
  35. M, S. C., & Gupta, S. (2025). Carbon sequestration in cementitious composites containing two-step thermochemically activated biochar. Cement and Concrete Composites, 164. https://doi.org/10.1016/j.cemconcomp.2025.106255
  36. Ma, Y., Xu, Y., Liu, F., Zhang, Y., & Wang, J. (2025). Surface chemical modulation of nitrogen-doped microporous carbon for efficient removal of H2S and CO2: The effect of nitrogen functionality. Microporous and Mesoporous Materials, 387. https://doi.org/10.1016/j.micromeso.2025.113517
  37. Monteagudo, J. M., Durán, A., Alonso, M., & Stoica, A. I. (2025). Investigation of effectiveness of KOH-activated olive pomace biochar for efficient direct air capture of CO2. Separation and Purification Technology, 352. https://doi.org/10.1016/j.seppur.2024.127997
  38. Monteagudo, J. M., Durán, A., Zhao, Y., & Monteagudo, J. (2026). CO2 capture by olive pomace biochar: Effect of relative humidity, isosteric heat of adsorption, and a preliminary Life Cycle Assessment investigation. Separation and Purification Technology, 385, 136445. https://doi.org/10.1016/J.SEPPUR.2025.136445
  39. Nandiyanto, A. B. D., Ragadhita, R., & Fiandini, M. (2023). Interpretation of Fourier Transform Infrared Spectra (FTIR): A Practical Approach in the Polymer/Plastic Thermal Decomposition. Indonesian Journal of Science and Technology, 8(1), 113–126. https://doi.org/10.17509/ijost.v8i1.53297
  40. Naseem, M., Iqbal, S., Malik, H., Awais, M., Jehan, S., & Jabeen, S. (2024). Environmental implications of biochar. In Biochar - Solid Carbon for Sustainable Agriculture (pp. 109–125). Bentham Science Publishers. https://doi.org/10.2174/9789815238068124010009
  41. Ong C.K., Ghazali N.F., Hasbullah H., Ismail A.F., Rahman S.A., Kusworo T.D., Lee C.T., 2024, Biomass-Based Biochar as Adsorbent: A Mini Review of Production Methods, Characterization, and Sustainable Applications, Chemical Engineering Transactions, 113, 493-498. https://doi.org/10.3303/CET24113083
  42. Peng, Z., Liu, S., Long, Y., Xiao, M., & Feng, H. (2023). Lattice Boltzmann Simulation of the Kinetics Process of Methane Diffusion with the Adsorption-Desorption Hysteresis Effect in Coal. ACS Omega, 8(34), 31135–31144. https://doi.org/10.1021/acsomega.3c03095
  43. Pradhan, C., Ghosh A.K, Singh, P., & Gadhwal, R. (2024). Agroforestry Systems: An Effective Toolfor Carbon Sequestration. In Sustainable Management and Conservation of Environmental Resources in India (pp. 181–206). Apple Academic Press. https://doi.org/10.1201/9781003469278-8
  44. Premchand, P., Demichelis, F., Galletti, C., Chiaramonti, D., Bensaid, S., Antunes, E., & Fino, D. (2024). Enhancing biochar production: A technical analysis of the combined influence of chemical activation (KOH and NaOH) and pyrolysis atmospheres (N2/CO2) on yields and properties of rice husk-derived biochar. Journal of Environmental Management, 370. https://doi.org/10.1016/j.jenvman.2024.123034
  45. Promakhova, E. V., Kuksina, L. V., & Galosov, V. N. (2019). Extreme Erosion Events and Climate Change. In Springer Proceedings in Earth and Environmental Sciences (pp. 118–120). https://doi.org/10.1007/978-3-030-03646-1_22
  46. Qu, J., Wang, Y., Tian, X., Jiang, Z., Deng, F., Tao, Y., Jiang, Q., Wang, L., & Zhang, Y. (2021). KOH-Activated Porous Biochar with High Specific Surface Area for Adsorptive Removal of Chromium (VI) and Naphthalene from Water: Affecting Factors, Mechanisms and Reusability Exploration. Journal of Hazardous Materials, 401. https://doi.org/10.1016/j.jhazmat.2020.123292
  47. Quan, C., Zhou, Y., Wang, J., Wu, C., & Gao, N. (2023). Biomass-based carbon materials for CO2capture: A review. In Journal of CO2 Utilization (Vol. 68). Elsevier Ltd. https://doi.org/10.1016/j.jcou.2022.102373
  48. Rahman, Maryono, & Sigiro, O. N. (2023). What is the True Carbon Fraction Value of Mangrove Biomass. Malaysian Journal of Science, 42(2), 67–72. https://doi.org/10.22452/mjs.vol42no2.10
  49. Ringsby, A. J., Ross, C. M., & Maher, K. (2024). Sorption of Soil Carbon Dioxide by Biochar and Engineered Porous Carbons. Environmental Science and Technology, 58(19), 8313–8325. https://doi.org/10.1021/acs.est.4c02015
  50. Sivaraman, S., Shanmugam, S. R., Venkatachalam, P., Shanmugam, R., Chan Basha, A., & Saady, N. M. C. (2025). Effect of pretreatment type on the physico-chemical properties of activated carbons derived from an invasive weed Prosopis juliflora: potential applications. Materials Research Express, 12(1). https://doi.org/10.1088/2053-1591/ada5c4
  51. Song, H., Wang, J., Garg, A., & Lin, S. (2024). Exploring mechanism of five chemically treated biochars in adsorbing ammonium from wastewater: understanding role of physiochemical characteristics. Biomass Conversion and Biorefinery, 14(5), 5847–5859. https://doi.org/10.1007/s13399-020-01135-9
  52. Standardized Product Definition and Product Testing Guidelines for Biochar That Is Used in Soil (aka IBI Biochar Standards). (n.d.). Retrieved http://www.biochar-international.org/characterizationstandard
  53. Wang, L., Luo, P., Jiang, C., Shen, J., Liu, F., Xiao, R., & Wu, J. (2023). Distinct effects of biochar addition on soil macropore characteristics at different depths in a double-rice paddy field. Science of the Total Environment, 857. https://doi.org/10.1016/j.scitotenv.2022.159368
  54. Wijitkosum, S. (2022). Biochar derived from agricultural wastes and wood residues for sustainable agricultural and environmental applications. International Soil and Water Conservation Research, 10(2), 335–341. https://doi.org/10.1016/j.iswcr.2021.09.006
  55. Wolicki, R. D., Barbacane, N., Ciulla, M., Arca, S., D’Alessandro, E., Parisi, P., Morodei, F., & Di Profio, P. (2024). Possible Alternative to Established CCS Technologies: Technical and Economical Evaluation. Society of Petroleum Engineers. https://doi.org/10.2118/223362-MS
  56. Xiao, X., Chen, B., Chen, Z., Zhu, L., & Schnoor, J. L. (2018). Insight into Multiple and Multilevel Structures of Biochars and Their Potential Environmental Applications: A Critical Review. In Environmental Science and Technology (Vol. 52, Number 9, pp. 5027–5047). American Chemical Society. https://doi.org/10.1021/acs.est.7b06487
  57. Xie, T., He, J., Xu, L.-C., Yan, T., Pan, Q.-W., Wang, L.-W., & Pan, W.-G. (2025). Preparation of N-doped porous biochar with high CO2 adsorption performance via one-step molten salt thermal treatment. Chemical Engineering Journal, 521, 166621. https://doi.org/10.1016/j.cej.2025.166621
  58. Yadav, N. K., Singh, S. K., Patel, A. B., Meitei, M. M., Meena, D. K., Yadav, M. K., Lal, J., & Choudhary, B. K. (2023). Biochar production methods vis-a-vis aquaculture applications: a strategy for sustainable paradigm. In Organic Farming: Global Perspectives and Methods, Second Edition (pp. 537–559). Elsevier. https://doi.org/10.1016/B978-0-323-99145-2.00010-0
  59. Yan, L., Gao, G., Lu, M., Riaz, M., Zhang, M., Tong, K., Yu, H., Yang, Y., Hao, W., & Niu, Y. (2024). Insight into the Amelioration Effect of Nitric Acid-Modified Biochar on Saline Soil Physicochemical Properties and Plant Growth. Plants, 13(23). https://doi.org/10.3390/plants13233434
  60. Zhang, C., Ji, Y., Li, C., Zhang, Y., Sun, S., Xu, Y., Jliang L, & Wu, C. (2023). The application of biochar for CO2 capture: influence of biochar preparation and CO2 capture reactors. Ind. Eng. Chem. Res, 62, 17168–17181. doi: 10.1021/acs.iecr.3c00445
  61. Zhang, J., Shao, J., Jin, Q., Zhang, X., Yang, H., Chen, Y., Zhang, S., & Chen, H. (2020). Effect of Deashing on Activation Process and Lead Adsorption Capacities of Sludge-Based Biochar. Science of The Total Environment, 716, 137016. https://doi.org/10.1016/J.SCITOTENV.2020.137016
  62. Zhang, Y., Jin, Y., Li, S., Wu, H., & Luo, H. (2024). Preparation of pistachio shell-based porous carbon and its adsorption performance for low concentration CO2. Particuology, 95, 103–114. https://doi.org/10.1016/j.partic.2024.09.015
  63. Zhi, F., Wang, Y., Wang, J., Zhang, B., Qu, J., Hou, X., Zhao, Y., & Hu, Q. (2025). Advanced biochar for accelerated and efficient pollutant removal in complex water systems. Separation and Purification Technology, 363. https://doi.org/10.1016/j.seppur.2025.132133

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