Original polyol process for the synthesis of TiO2@TiZn2O4@ZnTiO3 ternary hybrid nanocomposite: microstructure, optical properties, and enhanced photocatalytic activity

1. Z. Xing, J. Zhang, J. Cui, J. Yin, T. Zhao, J. Kuang, Z. Xiu, N. Wan, W. Zhou, Recent advances in floating TiO2-based photocatalysts for environmental application. Appl. Catal. B Environ. 225, 452–467 (2018). https://doi.org/10.1016/j.apcatb.2017.12.05310.1016/j.apcatb.2017.12.053 ↗

2. M.M. Khan, S.A. Ansari, D. Pradhan, M.O. Ansari, D.H. Han, J. Lee, M.H. Cho, Band gap engineered TiO2 nanoparticles for visible light induced photoelectrochemical and photocatalytic studies. J. Mater. Chem. A. 2, 637–644 (2014). https://doi.org/10.1039/c3ta14052k10.1039/c3ta14052k ↗

3. H. Khan, H.U. Shah, Modification strategies of TiO2-based photocatalysts for enhanced visible‑light activity and energy storage ability: a review. J. Environ. Chem. Eng. 11(6), 111532 (2023). https://doi.org/10.1016/j.jece.2023.11153210.1016/j.jece.2023.111532 ↗

4. I. Arora, H. Chawla, A. Chandra, S. Sagadevan, S. Garg, Advances in the strategies for enhancing the photocatalytic activity of TiO2: conversion from UV-light active to visible-light active photocatalyst. Inorg. Chem. Commun. 143, 109700 (2022). https://doi.org/10.1016/j.inoche.2022.10970010.1016/j.inoche.2022.109700 ↗

5. S. Agidew, M. Abebe, P. Asaithambi, E. Alemayehu, P. Darvishzadeh, H. Sohrabpoor, N.E. Gorji, (2016), Numerical device simulation of carbon nanotube contacted CZTS solar cells. Optics and Quantum Electronics 48: 480–485. https://doi.org/10.1007/s11082-016-0741-510.1007/s11082-016-0741-5 ↗

6. T. Mao, J. Zha, Y. Hu, Q. Chen, J. Zhang, X. Luo, Research progress of TiO2 modification and photodegradation of organic pollutants. Inorganics 12(7), 178–200 (2024). https://doi.org/10.3390/inorganics1207017810.3390/inorganics12070178 ↗

7. H. Tian, S. Wang, C. Zhang, J.-P. Veder, J. Pan, M. Jaroniec, L. Wang, J. Liu, Design and synthesis of porous ZnTiO3/TiO2 nanocages with heterojunctions for enhanced photocatalytic H₂ production. J. Mater. Chem. A. 5, 11615–11622 (2017). https://doi.org/10.1039/C7TA00148G10.1039/C7TA00148G ↗

8. U.O. Bhagwat, J.J. Wu, A.M. Asiri, S. Anandan, Synthesis of ZnTiO3@ TiO2 heterostructure nanomaterial as a visible light photocatalyst. Chem. Sel. 4, 6106–6112 (2019). https://doi.org/10.1002/slct.20190108310.1002/slct.201901083 ↗

9. Z. Pei, P. Wang, Z. Li, Investigation of ZnTiO3/TiO2 composites and their application in photocatalysis. Eur. J. Chem. 10(1), 7–11 (2019). https://doi.org/10.5155/eurjchem.10.1.7-11.182410.5155/eurjchem.10.1.7-11.1824 ↗

10. F. Wei, Y. Huang, G. Zhang, J. Dai, R. Li, H. Zhang, M. Ge, W. Zhang, Rational construction of MOF-derived porous ZnTiO3/TiO2 heterostructured photocatalysts with remarkable photocatalytic performance. ACS Omega 8, 41765–41772 (2023). https://doi.org/10.1021/acsomega.3c0123410.1021/acsomega.3c01234 ↗

11. T.V. Torbati, V. Javanbakht, Fabrication of TiO2/Zn2TiO4/Ag nanocomposite for synergic effects of UV radiation protection and antibacterial activity in sunscreen. Colloids Surf. B Biointerfaces 187, 110652 (2020). https://doi.org/10.1016/j.colsurfb.2019.11065210.1016/j.colsurfb.2019.110652 ↗

12. C.F. Shiha, W.M. Li, M.M. Lin, C.Y. Hsiao, K.T. Hung, Low-temperature sintered Zn2TiO4:TiO2 with near-zero temperature coefficient of resonant frequency at microwave frequency. J. Alloys Compd. 485, 408–412 (2009). https://doi.org/10.1016/j.jallcom.2009.05.15310.1016/j.jallcom.2009.05.153 ↗

13. L. Khatua, R. Panda, A.K. Nayak, A. Singh, P.K. Sahoo, D. Pradhan, U.P. Singh, S.K. Das, Efficient UV photocatalytic dye decomposition activity with cost effective solid state reaction grown zinc orthotitanate (Zn2TiO4) nanoparticles. J. Alloys Compd. 764, 895–900 (2018). https://doi.org/10.1016/j.jallcom.2018.06.12610.1016/j.jallcom.2018.06.126 ↗

14. H.S. Lim, J. Lee, S. Lee, Y.S. Kang, Y.K. Sun, K.D. Suh, Walnut-like ZnO@ Zn2TiO4 multicore-shell submicron spheres with a thin carbon layer: fine synthesis, facile structural control and solar light photocatalytic application. Acta Mater. 122, 287–297 (2017). https://doi.org/10.1016/j.actamat.2016.09.03110.1016/j.actamat.2016.09.031 ↗

15. S. Manchala, L.R. Nagappagari, S.M. Venkatakrishnan, V. Shanker, Facile synthesis of noble-metal free polygonal Zn2TiO4 nanostructures for highly efficient photocatalytic hydrogen evolution under solar light irradiation. Int. J. Hydrog. Energy. 43(29), 13145–13157 (2018). https://doi.org/10.1016/j.ijhydene.2018.05.03510.1016/j.ijhydene.2018.05.035 ↗

16. R. Ghamarpoor, A. Fallah, M. Jamshidi, A review of synthesis methods, modifications, and mechanisms of ZnO/TiO₂-based photocatalysts for photodegradation of contaminants. ACS Omega 9, 25457–25492 (2024). https://doi.org/10.1021/acsomega.3c0871710.1021/acsomega.3c08717 ↗

17. K.S. Ranjith, T. Uyar, ZnO-TiO2 composites and ternary ZnTiO3 electrospun nanofibers: influence on annealing on photocatalytic response and reusable functionality. CrystEngComm 20, 5801–5813 (2018). https://doi.org/10.1039/C8CE00920A10.1039/C8CE00920A ↗

18. C.-Y. Hsu, Z.H. Mahmoud, S. Abdullaev, F.K. Ali, Y.A. Naeem, R.M. Mizher, M. Karim, A.S. Abdulwahid, Z. Ahmadi, S. Habibzadeh, E. Kianfar, Nano titanium oxide (nano-TiO2): a review of synthesis methods, properties, and applications. Case Stud. Chem. Environ. Eng. 9, 100626 (2024). https://doi.org/10.1016/j.cscee.2024.10062610.1016/j.cscee.2024.100626 ↗

19. J. Mrázek, L. Spanhel, M. Surynek, M. Potel, V. Matejec, Crystallization properties of RE-doped (RE = Eu, Er, Tm) Zn2TiO4 prepared by the sol–gel method. J. Alloys Compd. 509, 4018–4024 (2011). https://doi.org/10.1016/j.jallcom.2011.01.00910.1016/j.jallcom.2011.01.009 ↗

20. K.M. Girish, S.C. Prashantha, H. Nagabhushana, C.R. Ravikumar, H.P. Nagaswarupa, R. Naik, H.B. Premakumar, B. Umesh, Multi-functional Zn2TiO4:Sm^{}3^{}⁺ nanopowders: excellent performance as an electrochemical sensor and an UV photocatalyst. J. Sci. Adv. Mater. Devices 3(2), 151–160 (2018). https://doi.org/10.1016/j.jsamd.2018.02.00110.1016/j.jsamd.2018.02.001 ↗

21. R.B. Pinto, P. Peralta-Zamora, F. Wypych, Fabrication of ZnO–Zn2TiO4 nanocomposite from zinc hydroxide nitrate and its photocatalytic efficiency. J. Photochem. Photobiol. A Chem. 353, 46–52 (2018). https://doi.org/10.1016/j.jphotochem.2017.11.00810.1016/j.jphotochem.2017.11.008 ↗

22. A. Fkiri, M.R. Santacruz, A. Mezni, L.S. Smiri, V. Keller, N. Keller, One-pot synthesis of lightly doped Zn_{}1−x_{}Cu_{}x_{}O and Au– Zn_{}1−x_{}Cu_{}x_{}O with solar light photocatalytic activity in liquid phase. Environ. Sci. Pollut. Res. 24, 15622–15633 (2017). https://doi.org/10.1007/s11356-017-9067-510.1007/s11356-017-9067-5 ↗

23. A. Fkiri, M.A. Saidani, A. Chmangui, L.S. Smiri, One-pot synthesis of copper-doped ZnO nanorods photocatalysts: degradation of Diuron herbicide under simulated solar light. J. Inorg. Organomet. Polym. Mater. 33, 2523–2530 (2023). https://doi.org/10.1007/s10904-023-02654-410.1007/s10904-023-02654-4 ↗

24. M.A. Saidani, A. Fkiri, L.S. Smiri, Facile synthesis of Ag/ZnO photocatalysts on the degradation of Diuron herbicide under simulated solar light and the investigation of its antibacterial activity for waste-water treatment. J. Inorg. Organomet. Polym. Mater. 29, 710–720 (2019). https://doi.org/10.1007/s10904-018-1044-z10.1007/s10904-018-1044-z ↗

25. A. Mezni, N.B. Saber, M.M. Ibrahim, M. El-Kemary, A. Aldalbahi, P. Feng, AltalhiT, Facile synthesis of highly thermally stable TiO2 photocatalysts. New J. Chem. 41, 5021–5027 (2017). https://doi.org/10.1039/c7nj00747g10.1039/c7nj00747g ↗

26. M.A. Saidani, A. Fkiri, A. Chmangui, T. Altalhi, M. Zouaoui, A. Mezni, Synergistic effects of Cu-doping and Au-decoration on ZnO nanorods for photocatalytic applications. J. Mater. Sci. Mater. Electron. 36, 10990–10102 (2025). https://doi.org/10.1007/s10854-025-15158-310.1007/s10854-025-15158-3 ↗

27. J. Tian, J. Wang, J. Dai, X. Wang, Y. Yin, N-doped TiO2/ZnO composite powder and its photocatalytic performance for degradation of methyl orange. Surf. Coat. Technol. 204, 723–730 (2009). https://doi.org/10.1016/j.surfcoat.2009.09.02810.1016/j.surfcoat.2009.09.028 ↗

28. J. Arin, S. Thongtem, A. Phuruangrat, T. Thongtem, Characterization of ZnO–TiO2 and zinc titanate nanoparticles synthesized by hydrothermal process. Res. Chem. Intermed. 43, 3183–3195 (2017). https://doi.org/10.1007/s11164-016-2818-y10.1007/s11164-016-2818-y ↗

29. C. Mahdieh, K.P. Sana, F.D. Babak, Synthesis and characterization of novel antibacterial sol-gel derived TiO2/Zn2TiO4/Ag nanocomposite as an active agent in sunscreens. Ceram. Int. 45, 24413–24418 (2019). https://doi.org/10.1016/j.ceramint.2019.08.16310.1016/j.ceramint.2019.08.163 ↗

30. F.Z. Janani, H. Khiar, N. Taoufik, A. Elhalil, M. Sadiq, S. Mansouri, N. Barka, ZnO‑Zn2TiO4 heterostructure for highly efficient photocatalytic degradation of pharmaceuticals. Environ. Sci. Pollut. Res. 30, 81403–81416 (2023). https://doi.org/10.1007/s11356-022-22791-610.1007/s11356-022-22791-6 ↗

31. A. Negi, S. Ringwal, M. Pandey, M.T. Yassin, (2024) Plant-mediated Z-scheme ZnO/TiO2-NCs for antibacterial potential and dye degradation: experimental and DFT study. Scientific Reports, 14:7955–7968. https://doi.org/10.1038/s41598-024-57392-5 [B] Ramya R, Muthulakshmi G, Sudhahar S, Bhaskaran A (2024), Green synthesis and characterization studies of TiO2 nanoparticles and its potential biological performance. Nano-Structures & Nano-Objects 39: 101322. https://doi.org/10.1016/j.nanoso.2024.101322 [C] Ben Saber N, Mezni A, Alrooqi A, Altalhi T (2021), Facile one-pot synthesis of TiO2@ZnTiO3 nanocomposites with efficient photocatalytic activity. Materials Today: Proceedings 8(1): 778–783. https://doi.org/10.1080/24701556.2021.195225110.1038/s41598-024 ↗

32. X. Jaramillo-Fierro, S. González, H.A. Jaramillo, F. Medina, Synthesis of the ZnTiO₃/TiO₂ nanocomposite supported in Ecuadorian clays for the adsorption and photocatalytic removal of methylene blue dye. Nanomaterials. 10(9), 1891–1910 (2020). https://doi.org/10.3390/nano1009189110.3390/nano10091891 ↗

33. X. Jaramillo-Fierro, S. González, F. Montesdeoca-Mendoza, F. Medina, Structuring of ZnTiO₃/TiO₂ adsorbents for the removal of methylene blue, using zeolite precursor clays as natural additives. Nanomaterials 11(4), 898–922 (2021). https://doi.org/10.3390/nano1104089810.3390/nano11040898 ↗

34. J. Gogoi, D. Chowdhury, Photodegradation of emerging contaminant tetracycline using a zinc titanate nanocellulose composite as an efficient photocatalyst. Mater. Adv. 4(9), 2088–2098 (2023). https://doi.org/10.1039/d3ma00118k10.1039/d3ma00118k ↗

35. T.A. Altalhi, Original strategy for facile synthesis of hybrid “ZnO–Zn2TiO4” nanotubes and antimicrobial activity. Mater. Res. Express 5(10), 105001 (2018). https://doi.org/10.1088/2053-1591/aad9d010.1088/2053-1591/aad9d0 ↗

36. C.-Y. Wu, K.-J. Tu, J.-P. Deng, Y.-S. Lo, C.-H. Wu, Markedly enhanced surface hydroxyl groups of TiO2 nanoparticles with superior water-dispersibility for photocatalysis. Materials 10(5), 566 (2017). https://doi.org/10.3390/ma1005056610.3390/ma10050566 ↗

37. X.Y. Chen, X.Z. Wang, F.J. Liu, G.S. Zhang, X.J. Song, J. Tian, H.Z. Cui, Fabrication of porous Zn2TiO4–ZnO microtubes and analysis of their acetone gas sensing properties. Rare Met. 40(6), 1528–1535 (2021). https://doi.org/10.1007/s12598-020-01518-x10.1007/s12598-020-01518-x ↗

38. A.G. Dikovska, R.G. Nikov, G.V. Avdeev, G.B. Atanasova, T. Dilova, D.B. Karashanova, N.N. Nedyalkov, ZnO/Zn2TiO4 composite nanostructures produced by laser ablation in air. Phys. E. Low-Dimens. Syst. Nanostruct 150, 115707–115716 (2023). https://doi.org/10.1016/j.physe.2023.11570710.1016/j.physe.2023.115707 ↗

39. D. Chen, Y. Cheng, N. Zhou, P. Chen, Y. Wang, K. Li, S. Huo, P. Cheng, P. Peng, R. Zhang, L. Wang, H. Liu, Y. Liu, R. Ruan, Photocatalytic degradation of organic pollutants using TiO2-based photocatalysts: a review. J. Clean. Prod. 268, 121725 (2020). https://doi.org/10.1016/j.jclepro.2020.12172510.1016/j.jclepro.2020.121725 ↗

40. S.S. Alias, Z. Harun, F.H. Azhar, S.A. Ibrahim, B. Johar, Comparison between commercial and synthesised nano flower-like rutile TiO2 immobilised on green super adsorbent towards dye wastewater treatment. J. Clean. Prod. 251, 119448 (2020). https://doi.org/10.1016/j.jclepro.2019.11944810.1016/j.jclepro.2019.119448 ↗

41. G. Dong, Y. Wang, H. Lei, G. Tian, S. Qi, D. Wu, Hierarchical mesoporous titania nanoshell encapsulated on polyimide nanofiber as flexible, highly reactive, energy saving and recyclable photocatalyst for water purification. J. Clean. Prod. 253, 120021 (2020). https://doi.org/10.1016/j.jclepro.2020.12002110.1016/j.jclepro.2020.120021 ↗

42. M.A. Saidani, A. Gamraoui, E. Chiba, A. Fkiri, A. Alrooqi, T. Altalhi, S. Touil, R. Ajjel, A. Mezni, ROS-driven multifunctional Ag@TiO2-ZnTiO3 nanocomposite for synergistic photocatalytic, antibacterial and sonocatalytic activities. Inorg. Chem. Commun. 184, 116016 (2026). https://doi.org/10.1016/j.inoche.2025.11601610.1016/j.inoche.2025.116016 ↗

43. X. aramillo-Fierro, S. González, F. Medina, La-doped ZnTiO₃/TiO₂ nanocomposite supported on Ecuadorian diatomaceous earth as a highly efficient photocatalyst driven by solar light. Molecules 26, 6232 (2021). https://doi.org/10.3390/molecules2620623210.3390/molecules26206232 ↗

44. L. Wu, P. Wu, Y. Zhu, N. Zhu, Z. Dang, Preparation and characterization of ZnTiO₃–TiO₂/pillared montmorillonite composite catalyst for enhanced photocatalytic activity. Res. Chem. Intermed. 42, 5253–5268 (2016). https://doi.org/10.1007/s11164-015-2356-z10.1007/s11164-015-2356-z ↗

45. Y. Zhong, X. Zhang, Y. Xia, L. Zhang, Q. Xu, X. Zhu, W. Feng, Q. Qin, A fresh perspective on the impact of ZnTiO3 coupling on the microstructure and photocatalytic properties of TiO2 fabricated at varied temperatures. Molecules 28, 27626 (2023). https://doi.org/10.3390/molecules2822762610.3390/molecules28227626 ↗

46. M. Zulfiqar, S. Chowdhury, A.A. Omar, Hydrothermal synthesis of multiwalled TiO₂ nanotubes and its photocatalytic activities for Orange II removal. J. Environ. Sci. Health A. Tox. Hazard. Subst. Environ. Eng. 53, 1412–1422 (2018). https://doi.org/10.1080/01496395.2018.144405010.1080/01496395.2018.1444050 ↗

47. S.S. Alias, Z. Harun, F.H. Azhar, S.A. Ibrahim, B. Johar, Comparison between commercial and synthesised nano flower-like rutile TiO2 immobilised on green super adsorbent towards dye wastewater treatment. J. Clean. Prod. 251, 119448 (2020). https://doi.org/10.1016/j.jclepro.2019.11944810.1016/j.jclepro.2019.119448 ↗

48. C. Wattanawikkam, W. Pecharapa, Sonochemical synthesis, characterization, and photocatalytic activity of perovskite ZnTiO₃ nanopowders. IEEE Trans. Ultrason. Ferroelectr. Freq. Control. 63(10), 1663–1667 (2016). https://doi.org/10.1109/TUFFC.2016.259300210.1109/TUFFC.2016.2593002 ↗

49. N. Ben Saber, A. Mezni, A. Alrooqi, T. Altalhi, Facile one-pot synthesis of TiO2@ZnTiO3 nanocomposites with efficient photocatalytic activity. Inorg. Nano-Met. Chem. 52(6), 778–783 (2022). https://doi.org/10.1080/24701556.2021.195225110.1080/24701556.2021.1952251 ↗

50. M. Tang, S. Lu, L. He, X. Zhu, W. Feng, W. Zhang, Preparation, characterization of ZnTiO3/ZnO composite materials and their photocatalytic performance. Nanomaterials 12, 1345 (2022). https://doi.org/10.3390/nano1208134510.3390/nano12081345 ↗

51. B. Hailegnaw, Y. Birhanu, T. Melese, Enhanced photocatalytic degradation of organic dyes using rGO–TiO2 nanocomposites under simulated solar light. ChemistrySelect 9(13), e202403521 (2024). https://doi.org/10.1002/slct.20240352110.1002/slct.202403521 ↗

52. M. Ranjan, M. Shukla, B.R. Mehta, TiO2/Ag nanocomposite for efficient photocatalytic degradation of rhodamine B under UV light. J. Nanomater 2024, 9169241 (2024). https://doi.org/10.1155/2024/916924110.1155/2024/9169241 ↗

53. A. Fkiri, M.A. Saidani, A. Chmangui, L.S. Smiri, One-pot synthesis of copper-doped ZnO nanorods photocatalysts: degradation of diuron herbicide under simulated solar light. J. Inorg. Organomet. Polym. Mater 33, 2523–2530 (2023). https://doi.org/10.1007/s10904-023-02673-610.1007/s10904-023-02673-6 ↗

54. M.A. Saidani, A. Fkiri, L.-S. Smiri, Copper-doped hybrid Agx–Auy@ZnO nanoparticles and their enhanced photocatalytic activities. J. Inorg. Organomet. Polym. Mater 29, 1130–1140 (2019). https://doi.org/10.1007/s10904-019-01075-610.1007/s10904-019-01075-6 ↗

55. C. Karthikeyan, P. Arunachalam, R.J. Ramalingam, Photocatalytic degradation of diuron using carbon-doped TiO2 nanoparticles under UV irradiation. Catalysts 11(4), 457 (2021). https://doi.org/10.3390/catal1104045710.3390/catal11040457 ↗