Removal of zinc from water using graphene-like biochar produced from palm seed shells
Abstract
Water pollution by trace metals poses a serious threat to both human health and the environment, making their removal from contaminated water a critical issue. Recent research has focused on identifying efficient and sustainable adsorbents. In this study, oil palm seed shells (Elaeis guineensis) were used to synthesize graphene-like biochar (BGp), which was then partially oxidized to obtain oxidized biochar (BOGp), aimed at removing zinc from aqueous solutions via adsorption. Characterization of the materials revealed low moisture content and high ash content for both BGp and BOGp. Their bulk densities were 0.76 g/cm³ (BGp) and 0.71 g/cm³ (BOGp), while the point of zero charge (pHₚzc) values were 7.3 and 4, respectively. X-ray diffraction (XRD) analysis showed distinct peaks at 2θ ≈ 10° and 2θ ≈ 26.03°, characteristic of oxidized graphitic carbon. BOGp exhibited a higher BET specific surface area (340.32 m²/g) compared to BGp (228.20 m²/g). Infrared (FTIR) spectroscopy confirmed the oxidation of BOGp through intensified C=O stretching vibrations. Both materials demonstrated high zinc removal efficiencies. Using 0.1 g of adsorbent in 50 mL of a 1 mg/L zinc sulfate solution, removal rates of 73.4% (BGp) and 90.11% (BOGp) were achieved. The adsorption processes followed pseudo-second-order kinetics and were characterized as chemisorption. The Freundlich and Temkin isotherm models, indicating multilayer and exothermic adsorption, confirmed the effectiveness of both materials. This study underscores a sustainable and value-added approach to utilizing agricultural waste for water treatment applications.
References
Oladimeji, T. E., Oyedemi, M., Emetere, M. E., Agboola, O., Adeoye, J. B., & Odunlami, O. A. (2024). Review on the impact of heavy metals from industrial wastewater effluent and removal technologies. Heliyon, 10(22), Article e40370. https://doi.org/10.1016/j.heliyon.2024.e40370
Mohammadpour, A., Gharehchahi, E., Gharaghani, M. A., Shahsavani, E., Golaki, M., Berndtsson, R., & Khosravi, H. (2024). Assessment of drinking water quality and identifying pollution sources in a chromite mining region. Journal of Hazardous Materials, 480, Article 136050. https://doi.org/10.1016/j.jhazmat.2024.136050
Sumaya, M. U., Maria, K. H., Toma, F. T. Z., Zubair, M. A., & Chowdhury, M. T. (2023). Effect of stabilizer content in different solvents on the synthesis of ZnO nanoparticles using the chemical precipitation method. Heliyon, 9(10), Article e20871. https://doi.org/10.1016/j.heliyon.2023.e20871
Raj, R., Mayank, M., & Laiju, A. R. (2024). Removal of zinc metal by ion exchanger technique using Amberlite IRA-120. IOP Conference Series: Earth and Environmental Science, 1326, Article 012135. https://doi.org/10.1088/1755-1315/1326/1/012135
Sosa, S. M., Huertas, R., & Pereira, V. J. (2023). Combination of zinc oxide photocatalysis with membrane filtration for surface water disinfection. Membranes, 13(1), Article 56. https://doi.org/10.3390/membranes13010056
Xu, C., Zhou, J., Yin, S., Wang, Y., Zhang, L., Hu, S., & Li, J. (2021). Solvent extraction and separation of zinc-iron from spent pickling solution with tri-n-octylamine. Separation and Purification Technology, 278, Article 119579. https://doi.org/10.1016/j.seppur.2021.119579
Cherono, F., Mburu, N., & Kakoi, B. (2021). Adsorption of lead, copper and zinc in a multi-metal aqueous solution by waste rubber tires for the design of single batch adsorber. Heliyon, 7(10), Article e08254. https://doi.org/10.1016/j.heliyon.2021.e08254
Trivedi, Y., Sharma, M., Mishra, R. K., Sharma, A., Joshi, J., Gupta, A. B., & Kumar, A. (2025). Biochar potential for pollutant removal during wastewater treatment: A comprehensive review of separation mechanisms, technological integration, and process analysis. Desalination, 600, Article 118509. https://doi.org/10.1016/j.desal.2024.118509
Xiao, X., Chen, B., Zhu, L., & Schnoor, J. L. (2017). Sugar cane-converted graphene-like material for the superhigh adsorption of organic pollutants from water via coassembly mechanisms. Environmental Science & Technology, 51(21), 12644–12652. https://doi.org/10.1021/acs.est.7b03639
Panicker, N. J., Das, J., & Sahu, P. P. (2020). Synthesis of highly oxidized graphene (HOG) by using HNO3 and KMnO4 as oxidizing agents. Materials Today: Proceedings. Advance online publication. https://doi.org/10.1016/j.matpr.2020.05.037
Yannick, D. D., Zoungranan, Y., Dobi-Brice, K. K., Lynda, E., & Tchirioua, E. (2023). Graphene-like biochar from agricultural waste for cyanide removal: Kinetic study and adsorption isotherms. Science Journal of Chemistry, 11(5), 167–176. https://doi.org/10.11648/j.sjc.20231105.12
Yannick, D. D., Zoungranan, Y., Dobi-Brice, K. K., Lynda, E., & Tchirioua, E. (2024). Cyanide removal by graphene-type oxidized biochar: Kinetic study and adsorption isotherms. World Journal of Advanced Research and Reviews, 22(1), 660–670. https://doi.org/10.30574/wjarr.2024.22.1.1075
Lopez-Ramon, M. V., Stoeckli, F., Moreno-Castilla, C., & Carrasco-Marin, F. (1999). On the characterization of acidic and basic surface sites on carbons by various techniques. Carbon, 37(8), 1215–1221. https://doi.org/10.1016/S0008-6223(98)00317-0
Anderson, N., Gu, H., & Bergman, R. (2021). Comparison of novel biochars and steam activated carbon from mixed conifer mill residues. Energies, 14(24), Article 8472. https://doi.org/10.3390/en14248472
Chang, B., Guo, Y., Li, Y., Yin, H., Zhang, S., Yang, B., & Dong, X. (2015). Graphitized hierarchical porous carbon nanospheres: Simultaneous activation/graphitization and superior supercapacitance performance. Journal of Materials Chemistry A, 3(18), 9565–9577. https://doi.org/10.1039/C5TA00867K
Asano, N., Lu, J., Asahina, S., & Takami, S. (2021). Direct observation techniques using scanning electron microscope for hydrothermally synthesized nanocrystals and nanoclusters. Nanomaterials, 11(4), Article 908. https://doi.org/10.3390/nano11040908
Song, N.-J., Guo, N., Ma, C., Zhao, Y., Li, W., & Li, B. (2023). Modulating the graphitic domains and pore structure of corncob-derived hard carbons by pyrolysis to improve sodium storage. Molecules, 28(8), Article 3595. https://doi.org/10.3390/molecules28083595
Zhang, Z., Schniepp, H. C., & Adamson, D. H. (2019). Characterization of graphene oxide: Variations in reported approaches. Carbon, 154, 510–521. https://doi.org/10.1016/j.carbon.2019.07.103
Huang, M., Chou, C., & Teng, H. (2002). Pore-size effects on activated-carbon capacities for volatile organic compound adsorption. AIChE Journal, 48(8), 1804–1810. https://doi.org/10.1002/aic.690480820
Sierra, U., Álvarez, P., Blanco, C., Granda, M., Santamaría, R., & Menéndez, R. (2016). Cokes of different origin as precursors of graphene oxide. Fuel, 166, 400–403. https://doi.org/10.1016/j.fuel.2015.10.112
Yu, Z., Wang, W., Gao, H., & Liang, D. (2020). Properties analysis and preparation of biochar–graphene composites under a one-step dip coating method in water treatment. Applied Sciences, 10(11), Article 3689. https://doi.org/10.3390/app10113689
Krishnamoorthy, K., Veerapandian, M., Yun, K., & Kim, S.-J. (2013). The chemical and structural analysis of graphene oxide with different degrees of oxidation. Carbon, 53, 38–49. https://doi.org/10.1016/j.carbon.2012.10.013
Alam, S. N., Sharma, N., & Kumar, L. (2017). Synthesis of graphene oxide (GO) by modified Hummers method and its thermal reduction to obtain reduced graphene oxide (rGO). Graphene, 6(1), 1–18. https://doi.org/10.4236/graphene.2017.61001
Song, C., Wu, D., Zhang, F., Liu, P., Lu, Q., & Feng, X. (2012). Gemini surfactant assisted synthesis of two-dimensional metal nanoparticles/graphene composites. Chemical Communications, 48(16), 2119–2121. https://doi.org/10.1039/c2cc16890a
Spitalsky, Z., Danko, M., & Mosnacek, J. (2011). Preparation of functionalized graphene sheets. Current Organic Chemistry, 15(8), 1133–1150. https://doi.org/10.2174/138527211795202988
Uddin Monir, M., Muntasir Shovon, S., Ahamed Akash, F., Habib, M. A., Techato, K., Abd Aziz, A., & Chowdhury, A. A. (2024). Comprehensive characterization and kinetic analysis of coconut shell thermal degradation: Energy potential evaluated via the Coats-Redfern method. Case Studies in Thermal Engineering, 55, Article 104186. https://doi.org/10.1016/j.csite.2024.104186
Alhalili, Z., & Abdelrahman, E. A. (2024). Efficient removal of Zn(II) ions from aqueous media using a facilely synthesized nanocomposite based on chitosan Schiff base. Scientific Reports, 14, Article 17598. https://doi.org/10.1038/s41598-024-68745-5
Fouda-Mbanga, B. G., Onotu, O., & Tywabi-Ngeva, Z. (2024). Advantages of the reuse of spent adsorbents and potential applications in environmental remediation: A review. Green Analytical Chemistry, 11, Article 100156. https://doi.org/10.1016/j.greeac.2024.100156
Silva, L. M. S., Muñoz-Peña, M. J., Domínguez-Vargas, J. R., González, T., & Cuerda-Correa, E. M. (2021). Kinetic and equilibrium adsorption parameters estimation based on a heterogeneous intraparticle diffusion model. Surfaces and Interfaces, 22, Article 100791. https://doi.org/10.1016/j.surfin.2020.100791
Wang, J., & Guo, X. (2022). Rethinking of the intraparticle diffusion adsorption kinetics model: Interpretation, solving methods and applications. Chemosphere, 309(Pt 2), Article 136732. https://doi.org/10.1016/j.chemosphere.2022.136732
Bonilla-Petriciolet, A., Mendoza-Castillo, D. I., Dotto, G. L., & Duran-Valle, C. J. (2019). Adsorption in water treatment. In Reference module in chemistry, molecular sciences and chemical engineering. Elsevier. https://doi.org/10.1016/B978-0-12-409547-2.14390-2
Zhu, Y., Yi, B., Yuan, Q., Wu, Y., Wang, M., & Yan, S. (2018). Removal of methylene blue from aqueous solution by cattle manure-derived low temperature biochar. RSC Advances, 8(36), 19917–19929. https://doi.org/10.1039/C8RA03018A
Mekhalef Benhafsa, F., Kacha, S., Leboukh, A., & Belaid, K. D. (2018). Étude comparative de l’adsorption du colorant Victoria Bleu Basique à partir de solutions aqueuses sur du carton usagé et de la sciure de bois. Revue des Sciences de l’Eau, 31(2), 109–126. https://doi.org/10.7202/1051695ar
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