Performance of Metakaolin-Reinforced Unsaturated Polyester Resin in Metal Recovery from Wastewater and Potential of Wear Resistance
DOI:
https://doi.org/10.29194/NJES.29030460Keywords:
Metakaolin Reinforcement, Ni+2 Ion Recovery, Polymer Composite, Shore-D Hardness, Wear RateAbstract
Polymer composites reinforced with clay have garnered substantial academic and industrial interest owing to their environmental and mechanical benefits. This research focuses on the effectiveness of metakaolin-unsaturated polyester composites for sequestering Ni2+ ions from Ni(NO3)2 aqueous solutions and on their tribological performance. The composite materials were synthesized with varying metakaolin concentrations (1, 1.5, 3, and 5 wt.%) to evaluate the influence of clay content on nickel ion recovery and wear resistance. The experimental results show a direct correlation between the reinforcement percentage and the functional properties of the composites. The highest value (61.415%) of Ni+2 recovery efficiency was achieved at a metakaolin concentration of 5 wt.%, which is due to the increased density of active adsorption sites on the composite surface. Conversely, composites with lower metakaolin content exhibited diminished recovery rates due to a limited number of available sites for ion adsorption. Wear resistance results show the same trend, wherein the composite with 5 wt.% metakaolin exhibited maximum wear resistance, characterized by minimal material loss at the applied loads (5, 10, 15, and 20 N). Furthermore, Shore-D hardness measurements indicated a gradual enhancement in the material's hardness with increasing metakaolin content, which confirms the reinforcing role of the clay in enhancing the mechanical properties. Scanning Electron Microscopy (SEM) micrographs showed the formation of wear grooves aligned with the sliding direction during wear testing. In addition, agglomerates and surface deposits were formed that are correlated with the adsorption of metal ions onto the composite surface. These results prove that the incorporation of metakaolin as a reinforcing agent confers dual advantages: it significantly enhances the adsorptive capacity for Ni+2 ion recovery and improves the tribological and mechanical properties of the composite. This positions the material for use in environmental remediation, especially wastewater treatment, and in engineering applications requiring enhanced durability.
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References
P. Gañán, J. Barajas, R. Zuluaga, C. Castro, D. Marín, A. Tercjak, and D. H. Builes, "The evolution and future trends of unsaturated polyester biocomposites: A bibliometric analysis," Polymers, vol. 15, no. 13, p. 2970, 2023, https://doi.org/10.3390/polym15132970 . DOI: https://doi.org/10.3390/polym15132970
B. Sarde, Y. Patil, B. Dholakiya, and V. Pawar, "Effect of calcined kaolin clay on mechanical and durability properties of pet waste-based polymer mortar composites," Construction and Building Materials, vol. 318, p. 126027, 2022, https://doi.org/10.1016/j.conbuildmat.2021.126027 . DOI: https://doi.org/10.1016/j.conbuildmat.2021.126027
A. N. Balaji, M. K. V. Karthikeyan, V. Vignesh, A. B. Madhavan, N. Ayrilmis, K. H. Ryu, and H. J. Kim, "Properties and prototype applications of polyester composites reinforced with woven fabric of Agave vera-cruz fiber," Journal of Wood Science, vol. 71, no. 1, p. 30, 2025, https://doi.org/10.1186/s10086-025-02207-y DOI: https://doi.org/10.1186/s10086-025-02207-y
S. Bati, E. Çetkin, Y. Altunkaynak, and Y. H. Çelik, "Effect of kaolin ratio on wear, water absorption, acidic resistance, and mechanical properties of thermoset composites," Proc. Inst. Mech. Eng. Part C: J. Mech. Eng. Sci., vol. 239, no. 3, pp. 836–848, 2025, https://doi.org/10.1177/09544062241288170 DOI: https://doi.org/10.1177/09544062241288170
F. B. Witzke, N. A. M. Beltrame, C. A. da Luz, and R. A. Medeiros-Junior, "Abrasion resistance of metakaolin-based geopolymers through accelerated testing and natural wear," Wear, vol. 530, p. 204996, 2023, https://doi.org/10.1016/j.wear.2023.204996 DOI: https://doi.org/10.1016/j.wear.2023.204996
A. Hussain, V. Podgursky, D. Goljandin, and M. Antonov, "Industrial approach to circularity of polymer composites: Processing, characterization, mechanical testing, and wear regression," J. Reinf. Plast. Compos., vol. 43, no. 7–8, pp. 456–472, 2024, https://doi.org/10.1177/07316844231164563 DOI: https://doi.org/10.1177/07316844231164563
R. H. Hilal, "Using Taguchi experimental design to calculate and analyze thermal conductivity for (polyacrylamide–kaolin) composite," Kuwait Journal of Science, vol. 50, no. 3A, 2023, https://doi.org/10.48129/kjs.21061 . DOI: https://doi.org/10.48129/kjs.21061
R. Barreira-Pinto, R. Carneiro, M. Miranda, and R. M. Guedes, "Polymer-matrix composites: characterising the impact of environmental factors on their lifetime," Materials, vol. 16, no. 11, p. 3913, 2023, https://doi.org/10.3390/ma16113913 . DOI: https://doi.org/10.3390/ma16113913
S. V. Panin, L. A. Kornienko, D. G. Buslovich, and V. O. Alekseenko, "The role of elastic recovery in formation of tribological properties of ultra-high-molecular weight polyethylene with various sizes of initial powder," Russ. Phys. J., vol. 63, no. 5, pp. 867–876, 2020, https://doi.org/10.1007/s11182-020-02110-7 . DOI: https://doi.org/10.1007/s11182-020-02110-7
W. Zhai, L. Bai, R. Zhou, X. Fan, G. Kang, Y. Liu, and K. Zhou, "Recent progress on wear‐resistant materials: designs, properties, and applications," Adv. Sci., vol. 8, no. 11, p. 2003739, 2021, https://doi.org/10.1002/advs.202003739 . DOI: https://doi.org/10.1002/advs.202003739
R. H. Hilal, "Removal of Precious Metals from Electronic-Waste by Using Composite Material," in IOP Conf. Ser.: Mater. Sci. Eng., vol. 881, no. 1, p. 012089, Jul. 2020, https://doi.org/10.1088/1757-899X/881/1/012089 . DOI: https://doi.org/10.1088/1757-899X/881/1/012089
K. M. M. Al-zobai and S. A. Ahmed, "Design of Reverse Osmosis Water Treatment Unit Using Lanxess Lewaplus2," Al-Nahrain J. Eng. Sci., vol. 28, no. 1, pp. 8–12, 2025, https://doi.org/10.29194/NJES.28010008 . DOI: https://doi.org/10.29194/NJES.28010008
A. Lendlein and O. E. Gould, "Reprogrammable recovery and actuation behaviour of shape-memory polymers," Nat. Rev. Mater., vol. 4, no. 2, pp. 116–133, 2019, https://doi.org/10.1038/s41578-018-0078-8 DOI: https://doi.org/10.1038/s41578-018-0078-8
J. Li, H. Zhang, N. Wang, and T. Wei, "Preparation methodology and performance of methyl methacrylate modified unsaturated polyester resin mortar for thin layer repair," Int. J. Pavement Eng., vol. 26, no. 1, p. 2490217, 2025, https://doi.org/10.1080/10298436.2025.2490217 DOI: https://doi.org/10.1080/10298436.2025.2490217
R. Baghloul, L. Babouri, H. Hebhoub, F. Boukhelf, and Y. El Mendili, "Assessment of mechanical behavior and microstructure of unsaturated polyester resin composites reinforced with recycled marble waste," Buildings, vol. 14, no. 12, p. 3877, 2024, https://doi.org/10.3390/buildings14123877 DOI: https://doi.org/10.3390/buildings14123877
Y. Xiao, B. Li, Y. Huang, Z. Gong, P. Diao, C. Wang, and H. Bian, "High-value application of kaolin by wet mixing method in low heat generation and high wear-resistant natural rubber composites," Appl. Clay Sci., vol. 261, p. 107574, 2024, https://doi.org/10.1016/j.clay.2024.107574 DOI: https://doi.org/10.1016/j.clay.2024.107574
Q. Wang, M. Li, M. Xi, M. Zhao, X. Wang, X. Chen, and L. Ding, "Recovery of Ag (I) from wastewater by adsorption: Status and challenges," Toxics, vol. 12, no. 5, p. 351, 2024, https://doi.org/10.3390/toxics12050351 DOI: https://doi.org/10.3390/toxics12050351
M. F. Mubarak, M. A. Zayed, A. Nafady, and A. E. Shahawy, "Fabrication of hybrid materials based on waste polyethylene/porous activated metakaolinite nanocomposite as an efficient membrane for heavy metal desalination processes," Adsorpt. Sci. Technol., 2021, Art. no. 6695398, https://doi.org/10.1155/2021/6695398 DOI: https://doi.org/10.1155/2021/6695398
V. Medri, E. Papa, E. Landi, C. Maggetti, D. Pinelli, and D. Frascari, "Ammonium removal and recovery from municipal wastewater by ion exchange using a metakaolin K-based geopolymer," Water Res., vol. 225, p. 119203, 2022, https://doi.org/10.1016/j.watres.2022.119203 . DOI: https://doi.org/10.1016/j.watres.2022.119203
H. Wei, M. Yi, X. Li, L. Shao, F. Gao, X. Cui, and K. Wang, "Preparation of metakaolin-based geopolymer microspheres (MK@GMs) and efficient adsorption of F- from acidic wastewater," Sep. Purif. Technol., vol. 310, p. 123159, 2023, https://doi.org/10.1016/j.seppur.2023.123159 . DOI: https://doi.org/10.1016/j.seppur.2023.123159
M. J. Geu, Y. Zhuge, X. Ma, and T. M. Pham, "Optimising calcination temperature for high reactivity metakaolin: Influence on amorphous content, mineralogy and microstructure," Constr. Build. Mater., vol. 489, p. 142431, 2025, https://doi.org/10.1016/j.conbuildmat.2025.142431 . DOI: https://doi.org/10.1016/j.conbuildmat.2025.142431
M. M. Barbooti, B. D. Al-Dabbagh, and R. H. Hilal, "Preparation, characterization and utilization of polyacrylic acid–kaolin composite in the removal of heavy metals from water," Int. J. Environ. Sci. Technol., vol. 16, no. 8, pp. 4571–4582, 2019, https://doi.org/10.1007/s13762-018-2067-2 . DOI: https://doi.org/10.1007/s13762-018-2067-2
M. Ilyas, W. Ahmad, H. Khan, and I. Ahmad, "Application of composite adsorbents prepared from waste PS and PET for removal of Cr and Cu ions from wastewater," Desalin. Water Treat., vol. 171, pp. 144–157, 2019, https://doi.org/10.5004/dwt.2019.24764 DOI: https://doi.org/10.5004/dwt.2019.24764
F. A. Abdulla, N. M. Moustafa, and E. S. Al-Ameen, "Calculation of wear rate by weight and volume for aluminum samples," J. Univ. Babylon Eng. Sci., vol. 26, no. 7, pp. 331–339, 2018.
P. M. Godwin, Y. Pan, H. Xiao, and M. T. Afzal, "Progress in preparation and application of modified biochar for improving heavy metal ion removal from wastewater," J. Bioresour. Bioprod., vol. 4, no. 1, pp. 31–42, 2019, https://doi.org/10.21967/jbb. v4i1.180 . DOI: https://doi.org/10.21967/jbb.v4i1.180
O. P. Murphy, M. Vashishtha, P. Palanisamy, and K. V. Kumar, "A review on the adsorption isotherms and design calculations for the optimization of adsorbent mass and contact time," ACS Omega, vol. 8, no. 20, pp. 17407–17430, 2023, https://doi.org/10.1021/acsomega.2c08155 . DOI: https://doi.org/10.1021/acsomega.2c08155
Z. Ji, L. Su, and Y. Pei, "Synthesis and toxic metals (Cd, Pb, and Zn) immobilization properties of drinking water treatment residuals and metakaolin-based geopolymers," Mater. Chem. Phys., vol. 242, p. 122535, 2020, https://doi.org/10.1016/j.matchemphys.2019.122535 . DOI: https://doi.org/10.1016/j.matchemphys.2019.122535
İ. Kara, D. Yilmazer, and S. T. Akar, "Metakaolin based geopolymer as an effective adsorbent for adsorption of zinc (II) and nickel (II) ions from aqueous solutions," Appl. Clay Sci., vol. 139, pp. 54–63, 2017, https://doi.org/10.1016/j.clay.2017.01.008 . DOI: https://doi.org/10.1016/j.clay.2017.01.008
V. R. Moreira, E. A. Torres, J. C. Balarini, T. L. Miranda, L. V. Santos, and M. C. Amaral, "Non-dispersive solvent extraction as an alternative for sulfuric acid and copper recycling from membrane distillation concentrate of gold mining wastewater," Chem. Eng. J., vol. 471, p. 144622, 2023, https://doi.org/10.1016/j.cej.2023.144622 . DOI: https://doi.org/10.1016/j.cej.2023.144622
L. Wu, W. Wei, C. Wang, and B. J. Ni, "Toward high carbon recovery: Novel strategies to hindering the occurrence of competitive reactions during chain elongation process," J. Clean. Prod., vol. 419, p. 138340, 2023, https://doi.org/10.1016/j.jclepro.2023.138340 . DOI: https://doi.org/10.1016/j.jclepro.2023.138340
W. Zhai, L. Bai, R. Zhou, X. Fan, G. Kang, Y. Liu, and K. Zhou, "Recent progress on wear‐resistant materials: designs, properties, and applications," Adv. Sci., vol. 8, no. 11, p. 2003739, 2021, https://doi.org/10.1002/advs.202003739 . DOI: https://doi.org/10.1002/advs.202003739
I. Rout, M. Singh, T. R. Mahapatra, P. Mishra, S. Dash, and D. Mishra, "Characterization and optimization of dry sliding wear properties of partially biodegradable hybrid polymer composites," J. Bio- Tribo-Corros., vol. 11, no. 2, p. 59, 2025, https://doi.org/10.1007/s40735-025-00979-w . DOI: https://doi.org/10.1007/s40735-025-00979-w
M. H. Derkani, N. J. Bartlett, G. Koma, L. A. Carter, D. A. Geddes, J. L. Provis, and B. Walkley, "Mechanisms of dispersion of metakaolin particles via adsorption of sodium naphthalene sulfonate formaldehyde polymer," J. Colloid Interface Sci., vol. 628, pp. 745–757, 2022, https://doi.org/10.1016/j.jcis.2022.07.166 . DOI: https://doi.org/10.1016/j.jcis.2022.07.166
A. Kabirova, M. Uysal, M. Hüsem, Y. Aygörmez, H. Dehghanpour, S. Pul, and O. Canpolat, "Physical and mechanical properties of metakaolin-based geopolymer mortars containing various waste powders," Eur. J. Environ. Civil Eng., vol. 27, no. 1, pp. 437–456, 2023, https://doi.org/10.1080/19648189.2022.2050303 . DOI: https://doi.org/10.1080/19648189.2022.2050303
S. N. Danilova, S. B. Yarusova, N. N. Lazareva, I. Y. Buravlev, O. O. Shichalin, E. K. Papynov, … and A. A. Okhlopkova, "A study of the wear mechanism of composites modified with silicate filler," Ceramics, vol. 5, no. 4, pp. 731–747, 2022, https://doi.org/10.3390/ceramics5040053 . DOI: https://doi.org/10.3390/ceramics5040053
J. D. Gaiya, W. U. Eze, T. Oyegoke, A. O. Ameh, I. C. Madufor, and T. K. Bello, "Assessment of the dielectric properties of polyester/metakaolin composite," Eur. J. Mater. Sci. Eng., vol. 6, pp. 19–29, 2021, https://doi.org/10.36868/ejmse.2021.06.01.019 . DOI: https://doi.org/10.36868/ejmse.2021.06.01.019
V. Gigante, L. Aliotta, I. Canesi, M. Sandroni, A. Lazzeri, M. B. Coltelli, and P. Cinelli, "Improvement of interfacial adhesion and thermomechanical properties of PLA based composites with wheat/rice bran," Polymers, vol. 14, no. 16, p. 3389, 2022, https://doi.org/10.3390/polym14163389 . DOI: https://doi.org/10.3390/polym14163389
F. Kundie, C. H. Azhari, A. Muchtar, and Z. A. Ahmad, "Effects of filler size on the mechanical properties of polymer-filled dental composites: A review of recent developments," J. Phys. Sci., vol. 29, no. 1, pp. 141–165, 2018, https://doi.org/10.21315/jps2018.29.1.10 DOI: https://doi.org/10.21315/jps2018.29.1.10
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