Tailored biochar from oil palm trunk via controlled carbonization for efficient dye adsorption

Abstract

Oil palm trunks (OPT) represent an underutilized agricultural byproduct that poses significant environmental challenges. The effectiveness of OPT as feedstock for biochar production will be depends on carbonization conditions, yet the relationship between process parameters and biochar properties remains insufficiently explored. This study investigates the potential of converting OPT into micropores bioadsorbent through controlled carbonization. Biochar was produced at temperatures of 300, 400, and 500 °C, with residence times of 2, 3, and 4 h, and subsequently characterized for its physicochemical properties and adsorption capacity. The results indicate that biochar produced at 300 °C for 2 h exhibited the highest surface area (10.24 m²/g), while the carbon content peaked at 79.9% in biochar synthesized at 500 °C for 4 h. Notably, although the maximum surface area was observed at 300 °C for 2 h, superior MB removal (52.5%) at longer residence time (4 h) indicates that adsorption performance was governed primarily by surface functional chemistry and pore accessibility rather than surface area alone. The enhanced adsorption at mild carbonization was attributed to the preservation of oxygen-containing surface functional groups rather than surface area alone. Langmuir isotherm analysis provided the best fit (R²>0.9), yielding a maximum monolayer adsorption capacity of 3.57 mg g⁻¹ and a favourable separation factor (R_L<1). These results demonstrate that adsorption performance of OPT-derived biochar is governed by surface chemistry controlled through carbonization severity, positioning OPT as a promising low-cost precursor for sustainable dye adsorption applications.

Keywords

Oil palm trunk / Biochar / Carbonization / Bioadsorbent / Methylene blue adsorption / Lignocellulosic biomass

References

[1] Alothman Z. A review: fundamental aspects of silicate mesoporous materials. Materials, 2012, 5: 2874-2902

[2] Aziz MFSA, Yahya MS, Samsudin M, Hassan MR, Idris A. Microwave-assisted production of biochar from oil palm mesocarp fiber and its dye removal properties. Environ Qual Manage, 2022, 32(1): 315-322

[3] da Silva Medeiros DCC, Usman M, Chelme-Ayala P, El-Din MG. Biochar-enhanced removal of naphthenic acids from oil sands process water: influence of feedstock and chemical activation. Energy Environ Sustain, 2025, 1(2): 100028

[4] Farid MAA, Andou Y. Kinetic and thermodynamic of heterogeneously K₃PO₄/AC-catalysed transesterification via pseudo-first order mechanism and Eyring-Polanyi equation. Fuel, 2018, 232: 653-662

[5] Farid MAA, Lease J, Andou Y. Behaviour and mechanics of phenolic sorption by novel bio-based graphene derivatives as adsorbents. Chemosphere, 2024, 366: 143490

[6] Hakimi MIet al.. The versatility of lignocellulosic composition in oil palm trunks influences the adsorption capacity of derived biochar. Biomass Convers Biorefin, 2024

[7] Hassan N, Said M, Zainuddin M, Abdullah M. Biochar derived from oil palm trunk as a potential precursor in the production of high-performance activated carbon. Biomass Convers Biorefin, 2021

[8] Huff MD, Kumar S, Lee JW. Comparative analysis of pinewood, peanut shell, and bamboo biomass derived biochars produced via hydrothermal conversion and pyrolysis. J Environ Manage, 2014, 146: 303-308

[9] Ibrahim I, Ismail L, Andou Y, Hassan MA. Reduction of residual pollutants from biologically treated palm oil mill effluent final discharge by steam activated bioadsorbent from oil palm biomass. J Clean Prod, 2017, 141: 122-127

[10] Islam MA, Parvin MI, Dada TK, Kumar R, Antunes E. Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling. Biomass Convers Biorefin, 2024, 14: 28007-28021

[11] Katibi KK, Yunos KF, Man HC, Aris AZ, Mohd Nor MZ, Azis RS. An insight into a sustainable removal of bisphenol A from aqueous solution by novel palm kernel shell magnetically induced biochar: synthesis, characterization, kinetic, and thermodynamic studies. Polymers, 2021, 13(21): 3781

[12] Katibi KK, Shitu IG, Yunos KFM, Azis RS, Iwar RT, Adamu SB, Adebayo KR. Unlocking the potential of magnetic biochar in wastewater purification: a review on the removal of bisphenol A from aqueous solution. Environ Monit Assess, 2024, 1965492

[13] Katibi KK, Shitu IG, Azis RS, Kien CS, Pah LK, Awang Kechik MM, Yunos KFM, Amusa AA, Katibi MT. Synthesis of eco-friendly bio-based coconut shell magnetic biochar for efficient bisphenol S sequestration in aqueous environment: green technology breakthrough. Chem Eng Commun, 2024, 211121802-1827

[14] Kong SH, Ahmad Z, Ismail L, Zakaria M, Awang R. Palm kernel shell biochar production, characteristics and carbon sequestration potential. J Oil Palm Res, 2019, 31(3): 508-520

[15] Lawal AA, Aziz HA, Yusoff MS, Adlan MN. Production of biochar from oil palm frond by steam pyrolysis for removal of residual contaminants in palm oil mill effluent final discharge. J Clean Prod, 2020, 265: 121643

[16] Liu R, Ji W, Wang W, Li Y, Yin L, Song Y, He G. Innovative amorphous calcium carbonate for superior anionic dye adsorption towards near-zero discharge. Sep Purif Technol, 2025, 361: 131349

[17] Lu JY, Bu ZQ, Lei YQ, Wang D, He B, Wang J, Huang WT. Facile microwave-assisted synthesis of Sb₂O₃–CuO nanocomposites for catalytic degradation of p-nitrophenol. J Mol Liq, 2024, 409: 125503

[18] Nalaya P, Wahid SA, Izuan HEM. Characterization of empty fruit bunch biochar pyrolyzed at different temperatures with respect to activated carbon and their sorption capacities for pentachlorophenol. J Water Environ Technol, 2020, 18(5): 314-326

[19] Salleh NFM, Aziz M, Omar WN. Adsorptive performance of palm kernel shell-based biochar for the removal of methylene blue. Environ Sci Pollut Res, 2019, 26: 28780-28794

[20] Samsudin MH, Amirul AM, Rahman NA, Mubarak NM, Abdullah EC. Production of nanopore structure bio-adsorbent from wood waste through a self-sustained carbonization process for landfill leachate treatment. Biochem Eng J, 2022, 189: 108695

[21] Shitu IG, Katibi KK, Tafida RA, Iya SGD, Alotaibi KM, Babani S, Amusa AA, Elbidi M, Katibi MT, Mallik S. Synthesis and characterization of magnetic biochar nanocomposite from oil palm fronds for efficient copper (II) ion removal from leachate. Clean Technol Environ Policy, 2025, 27(8): 3681-3703

[22] Shrivastava P, Dwivedi A, Tiwari RK. Comparative investigation of yield and quality of bio-oil and biochar from pyrolysis of woody and non-woody biomasses. Energies, 2021, 14(4): 1092

[23] Tomczyk A, Sokołowska Z, Boguta P. Biochar physicochemical properties: pyrolysis temperature and feedstock kind effects. Rev Environ Sci Biotechnol, 2020, 19: 191-215

[24] Wyn HK, Wawa B, Lee KT. A novel approach to the production of biochar with improved fuel characteristics from biomass waste. Waste Biomass Valor, 2020, 11(12): 6467-6481

[25] Yang X, Luo S, Zhou J, Sun P, Guo Y, Zhao J, Gao B. Ball-milled dysprosium oxide loaded biochar–montmorillonite composite for efficient removal and great recycling performance of cationic organic pollutants. Ind Crops Prod, 2025, 235: 121777

[26] Zhang M, Gao B, Yao Y, Xue Y, Inyang M. Synthesis of porous MgO-biochar nanocomposites for removal of phosphate and nitrate from aqueous solutions. Chem Eng J, 2012, 210: 26-32

[27] Zhou Q, Liu Z, Wang X, Li Y, Qin X, Guo L, Zhou L, Xu W. Co₃s₄-pyrolysis lotus fiber flexible textile as a hybrid electrocatalyst for overall water splitting. J Energy Chem, 2024, 89: 336-344

[28] Zubair M, Khan A, Al-Amer AM, Danish M, Naqvi SA, Al-Zahrani SM, Shahzad A, Ahmad M. Adsorption behavior and mechanism of methylene blue, crystal violet, eriochrome black T, and methyl orange dyes onto biochar-derived date palm fronds waste produced at different pyrolysis conditions. Water Air Soil Pollut, 2020, 231(5): 1-19

Funding

Fundamental Research Grant Scheme (FRGS/1/2024/STG01/UPM/02/4)

Higher Education Center of Excellence (HICoE) Grant(5210008)

RIGHTS & PERMISSIONS

The Author(s)