[1] Zheng, K., Li, W., Wang, W., Chen, H., Huang, C., Ren, Q., & Qin, C. (2019). Preparation and characterisation of carboxymethyl-chitosan/sodium phytate composite membranes for adsorption in transformer oil. International Journal of Biological Macromolecules, 132, 658–665.
[2] Kim, T.-H., An, S. Y., & Gim, G. H. (2026). Electrical properties of liquid insulation oil under varying electrode shapes and temperatures. Korean Journal of Materials Research, 36(1).
[3] Jia, Y., Luo, X., Ji, S., Zhao, D., Qiu, Z., & Li, S. (2025). Pressure and stress characteristics of transformer tank with power-frequency arc fault in oil. Thin-Walled Structures, 210, Article 112986.
[4] Guerbas, F., Adjaout, L., & Abada, A. (2023). Accelerated thermal aging effect on the new and reclamation transformer oil behavior. In 2023 IEEE Electrical Insulation Conference (EIC) (pp. 1–4). IEEE.
[5] Wang, Y., Ma, G., Gao, D., Wang, Y., Xie, Y., Gao, X., Du, H., & Ji, J. (2024). Transformer oil-dissolved methane detection based on non-adiabatic tapered fiber using polyacrylate and cryptophane-A overlay deposition. Sensors and Actuators B: Chemical, 400, Article 134869.
[6] Yang, F., Zhou, L., Gui, Y., Tao, J., Zhang, J., Zhang, Q., & Xu, L. (2026). Adsorption performance of transition metal (Ag, Pb, and Ni)-modified ZrSe₂ monolayers toward dissolved gases (CO, CO₂, CH₄, and C₂H₄) in oil-immersed power transformers: A DFT study. Surfaces and Interfaces, Article 108471.
[7] Chen, X., Chen, S., Yang, D., Luo, H., Yang, P., & Cui, W. (2021). Quantitative prediction of aging state of oil-paper insulation based on Raman spectroscopy. AIP Advances, 11.
[8] Atanasova-Höhlein, I. (2021). IEC 60296 (Ed. 5)–A standard for classification of mineral insulating oil on performance and not on the origin. Transformers Magazine, 8, 86–91.
[9] Zhu, H., Zong, C., Fang, L., Zhang, H., Sun, Y., Tian, Y., Zhang, S., & Wang, X. (2026). Intelligent machine learning-based spectroscopy for condition monitoring of energy infrastructure: A review focused on transformer oils and hydrogen systems. Processes, 14(2), Article 255.
[10] Mahankali, S., Velpula, R., & Rao, D. (2026). Experimental investigation of transformer fault diagnosis using integrated DGA and physical inspection. Electric Power Systems Research, 254, Article 112669.
[11] Gherdaoui, C. E., Fontaine, H., Delbarre, J.-P., Debiak, R., Sansano, R., Hutin, O., & Roussey, A. (2025). Enhancing fumes catalytic treatment in transformer oil regeneration: A study on catalyst performances and process conditions. Journal of Environmental Chemical Engineering, Article 117181.
[12] Safiddine, L., Hadj‐Ziane Zafour, A., Fofana, I., Skender, A., Guerbas, F., & Boucherit, A. (2017). Transformer oil reclamation by combining several strategies enhanced by the use of four adsorbents. IET Generation, Transmission & Distribution, 11(11), 2912–2920.
[13] Fofana, I., Wasserberg, V., Borsi, H., & Gockenbach, E. (2004). Drying of transformer insulation using zeolite. IEEE Electrical Insulation Magazine, 20(1), 20–30.
[14] Hafez, A., Gerges, N., El-nagar, K., Mohamed, S., & Hashem, A. (2015). Reclamation of old transformer oil using kaolin clay. International Journal of Advanced Scientific and Technical Research, 4, 752–769.
[15] Laurentino, A., Parize, A., Laranjeira, M., Martins, A., Mayer, N., & De Favere, V. (2007). Regeneration of insulating mineral oil by carbonated amorphous calcium phosphate–chitosan adsorbent. Process Safety and Environmental Protection, 85(4), 327–331.
[16] Al-Zuhair, S., Noura, H., & Fardoun, A. (2011). Using activated carbon from waste date-pits as an adsorbent for transformer oil regeneration. In 2011 World Congress on Sustainable Technologies (WCST) (pp. 69–72). IEEE.
[17] Vu, T. T., La, T. V., Vu, M. K., Huynh, D. C., & Tran, N. K. (2020). Highly efficient adsorbent for the transformer oil purification by ZnO/graphene composite. Arabian Journal of Chemistry, 13(11), 7798–7808.
[18] Vu, T. T., La, T. V., & Vu, T. G. (2022). The highly efficient purification capacity of rGO-zeolite composites for aged oil in transformer machines. Arabian Journal of Chemistry, 15(3), Article 103683.
[19] He, F., Li, W., Pang, T., Zhou, L., Wang, C., Liu, H., Li, M., & He, X. (2022). Hydrothermal synthesis of boehmite nanorods from alumina sols. Ceramics International, 48(12), 18035–18047.
[20] Huang, H., Wang, L., Cai, Y., Zhou, C., Yuan, Y., Zhang, X., Wan, H., & Guan, G. (2015). Facile fabrication of urchin-like hollow boehmite and alumina microspheres with a hierarchical structure via Triton X-100 assisted hydrothermal synthesis. CrystEngComm, 17(6), 1318–1325.
[21] Dinarvandi, K., Samimi, A., Mohebbi-Kalhori, D., Zakeri, M., & Zakeralhosseini, R. (2024). Synthesis of mesoporous γ-alumina from a low-grade boehmite ore: Effect of thermal/chemical processing order on physico-chemical characteristics of adsorbent and regeneration of used transformer oils. Chemical Engineering Research and Design, 209, 72–80.
[22]Li, M., Si, Z., Wu, X., Weng, D., & Kang, F. (2014). Facile synthesis of hierarchical porous γ-Al₂O₃ hollow microspheres for water treatment. Journal of Colloid and Interface Science, 417, 369–378.
[23]Spiridon, I., Apostol, I., Dinu, M. V., Anghel, N., & Doroftei, F. (2024). New porous adsorbents based on natural polymers for treatment of motor oil contaminated wastewaters. Journal of Polymer Science, 62(22), 5411–5423.
[24]Jankovic, J., Lukic, J., Planojevic, J., Kolarski, D., & Janackovic, D. (2022). Application of highly selective adsorbent in the removal of elemental sulfur and other corrosive sulfur compounds from mineral insulating oils. IEEE Transactions on Dielectrics and Electrical Insulation, 29(1), 54–61.
[25]Fei, K., Dong, Z. Y., Shi, L., Meng, X., & Liu, N. (2024). K₂CO₃-loaded γ-Al₂O₃ for acid removal in waste transformer oil. Asia-Pacific Journal of Chemical Engineering, 19(2), Article e3016.
[26] Bekele, E. A., Korsa, H. A., & Desalegn, Y. M. (2024). Electrolytic synthesis of γ-Al₂O₃ nanoparticle from aluminum scrap for enhanced methylene blue adsorption: Experimental and RSM modeling. Scientific Reports, 14, Article 16957.
[27]Abdollahi, M., Atashi, H., & Tabrizi, F. F. (2017). Parametric investigation of γ-alumina granule preparation via the oil-drop route. Advanced Powder Technology, 28(5), 1356–1371.
[28] Kermani, M., Samimi, A., Mohebbi-Kalhori, D., Beigmoradi, R., Shokrollahzadeh, S., Xia, A., Sun, C., Sun, F., Ashori, A., & Madadi, M. (2024). Pulsed electric field treatment for efficient oil extraction from Nannochloropsis salina microalgae: A green and sustainable approach. Journal of Polymers and the Environment, 32, 5888–5901.
[29] Walkowicz, J., Staśkiewicz, J., Szafirowicz, K., Jakrzewski, D., Grzesiak, G., & Stępniak, M. (2013). Optimization of the ASPN process to bright nitriding of woodworking tools using the Taguchi approach. Journal of Materials Engineering and Performance, 22, 410–420.
[30] Koppenol, W. H., Stanbury, D. M., & Bounds, P. L. (2010). Electrode potentials of partially reduced oxygen species, from dioxygen to water. Free Radical Biology and Medicine, 49(3), 317–322.
[31] Armstrong, D. A., Huie, R. E., Koppenol, W. H., Lymar, S. V., Merényi, G., Neta, P., Ruscic, B., Stanbury, D. M., Steenken, S., & Wardman, P. (2015). Standard electrode potentials involving radicals in aqueous solution: Inorganic radicals (IUPAC Technical Report). Pure and Applied Chemistry, 87(11–12), 1139–1150.
[32]Schull, C. (1948). The determination of pore size distribution from gas adsorption data. Journal of the American Chemical Society, 70(4), 1405–1410.
[33]Wen, J., Yuan, R., Jiang, T., Yu, T., & Zhang, Y. (2024). Solvothermal synthesis and adsorption performance of layered boehmite using aluminum chloride and high-alumina fly ash. Chinese Journal of Chemical Engineering, 70, 280–290.
[34] Edwards, M., Russell, R., Shimskey, R., & Peterson, R. (2010). Bench-scale testing of the continuous sludge leaching process. Separation Science and Technology, 45(12–13), 1807–1813.
[35]Han, X., Wang, Y., Zhang, N., Meng, J., Li, Y., & Liang, J. (2021). Facile synthesis of mesoporous silica derived from iron ore tailings for efficient adsorption of methylene blue. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 617, Article 126391.
[36] Hao, J., Wang, X., Wang, Y., Guo, F., & Wu, Y. (2022). Optimization, kinetic studies of tin leaching from waste printed circuit boards and selective tin recovery from its pregnant solution. Metals, 12(6), Article 954.
[37]Behmadi, R., Mokhtarian, M., Ghadrian, K., Davoodi, A., & Hosseinpour, S. (2022). Development of a low-cost activated mesoporous bauxite for the reclamation of used transformer oil. Separation and Purification Technology, 280, Article 119826.
[38] Soni, P., Sur, A., Gaba, V. K., & Sah, R. P. (2025). Review on improvement of adsorption refrigeration systems performance using composite adsorbent: Current state of art. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 47(1), 8031–8055.
[39] Elele, U., Nekahi, A., Arshad, A., & Fofana, I. (2022). Towards online ageing detection in transformer oil: A review. Sensors, 22(20), Article 7923.
[40] Soni, R., & Mehta, B. (2021). Review on asset management of power transformer by diagnosing incipient faults and faults identification using various testing methodologies. Engineering Failure Analysis, 128, Article 105634.
[41] Zhang, J., Guo, Y., Pau, D., Li, K., Xie, K., & Zou, Y. (2021). Pyrolysis kinetics and determination of organic components and N-alkanes yields of Karamay transformer oil using TG, FTIR and Py-GC/MS analyses. Fuel, 306, Article 121691.
[42]Wan, F., Du, L., Chen, W., Wang, P., Wang, J., & Shi, H. (2017). A novel method to directly analyze dissolved acetic acid in transformer oil without extraction using Raman spectroscopy. Energies, 10(7), Article 967.
[43] Kalathiripi, H., & Karmakar, S. (2017). Analysis of transformer oil degradation due to thermal stress using optical spectroscopic techniques. International Transactions on Electrical Energy Systems, 27(9), Article e2346.
[44] Meena, R. R., Chaki, S., Khimani, A. J., & Deshpande, M. (2018). Transformer oil degradation study by chromatography, spectroscopy and dissolved gas analysis. Petroleum & Coal, 60.
[45] Abi Munajad, C. S. (2018). Fourier transform infrared (FTIR) spectroscopy analysis of transformer paper in mineral oil-paper composite insulation under accelerated thermal aging. Energies, 11(2), Article 364.
[46] Darwish, M. M., Hassan, M. H., Abdel‐Gawad, N. M., Lehtonen, M., & Mansour, D. E. A. (2024). A new technique for fault diagnosis in transformer insulating oil based on infrared spectroscopy measurements. High Voltage, 9(2), 319–335.
[47]Pillai, S. S., Aarathy, A., Gopinath, D., Aryanandiny, B., & Sankar, B. (2020). Effects of magnetite and titania nanoparticles on properties of transformer insulating oil. Nano Express, 1(2), Article 020040.
[48] Oparanti, S. O., Salaudeen, I. K., Adekunle, A. A., Oteikwu, V. E., Galadima, A. I., & Abdelmalik, A. A. (2023). Physicochemical and dielectric study on Nigerian Thevetia peruviana as a potential green alternative fluid for transformer cooling/insulation. Waste and Biomass Valorization, 14, 1693–1703.
[49] Wang, Y., Dou, P., You, X., Liu, Q., Fei, Z., Chen, X., Zhang, Z., Tang, J., Cui, M., & Qiao, X. (2023). Naphthenic acids removal from model transformer oil by diethylamine modified resins. Molecules, 28(6), Article 2444.
