1 Recent advances in the synthesis of BiFeO₃ composites as photocatalysis: challenges and opportunities 1 Bismuth ferrite (BiFeO₃) is a widely studied multiferroic material with strong ferroelectric and magnetic properties, making it highly suitable for applications in sensors, actuators, and energy storage. The development of BiFeO₃ composites has gained significant attention due to their enhanced functional properties compared to pure BiFeO₃. Various synthesis techniques, including sol-gel processing, hydrothermal synthesis, and solid-state reactions, have been explored to optimize structural, electrical, andmagnetic characteristics. The review also explores the applications of BiFeO₃ composites as photocatalysis, highlighting recent breakthroughs and potential future directions. This overview provides insights into the current state of BiFeO₃ composite synthesis and its implications for advancing multiferroic materials in modern technology. 200 207 Marzieh Fattahi Department of Chemistry, Amirkabir University of Technology Iran Mzfatahi@aut.ac.ir BiFeO₃ Multiferroic material Composites Synthesis Article5.pdf [1] C. Gumiel, D.G. Calatayud, Thin film processing of multiferroic BiFeO3: From sophistication to simplicity. A review, Boletín de la Sociedad Española de Cerámica y Vidrio 61(6) (2022) 708-732.##[2] C. Gumiel, T. Vranken, M.S. Bernardo, T. Jardiel, A. Hardy, M.K. Van Bael, M. Peiteado, Thin film composites in the BiFeO3–Bi4Ti3O12 system obtained by an aqueous solution-gel deposition methodology, Boletín de la Sociedad Española de Cerámica y Vidrio57(1) (2018) 19-28.##[3] N. Itoh, T. Shimura, W. Sakamoto, T. Yogo, Fabrication and Characterization of BiFeO3-BaTiO3 Ceramics by Solid State Reaction, Ferroelectrics 356(1) (2007) 19-23 .##[4] T. Cadenbach, M.J. Benitez, A.L. Morales, C. Costa Vera, L. Lascano, F. Quiroz, A. Debut, K. Vizuete, Nanocasting synthesis of BiFeO3 nanoparticles with enhanced visible-light photocatalytic activity, Beilstein Journal of Nanotechnology 11 (2020) 1822-1833.##[5] Q. Li, S. Bao, T. Hong, L. Ai, Y. Liu, Y. Jing, J. Li, Influence of Vanadium Substitution on Phase Structure, Magnetic and Dielectric Properties of BiFeO₃ Ceramics, Journal of Magnetics 23(1) (2018) 5-10.##[6] T. Soltani, B.-K. Lee, Sono-synthesis of nanocrystallized BiFeO3/reduced graphene oxide composites for visible photocatalytic degradationimprovement of bisphenol A, Chemical Engineering Journal 306 (2016) 204-213 .##[7] T. Zhang, Y. Shen, Y. Qiu, Y. Liu, R. Xiong, J. Shi, J. Wei, Facial Synthesis and Photoreaction Mechanism of BiFeO3/Bi2Fe4O9 Heterojunction Nanofibers, ACS Sustainable Chemistry Engineering 5(6) (2017) 4630-4636.##[8] T. Fan, C. Chen, Z. Tang, Hydrothermal synthesis of novel BiFeO3/BiVO4 heterojunctions with enhanced photocatalytic activities under visible light irradiation, RSC Advances 6(12) (2016) 9994-10000.##[9] R. Safi, H. Shokrollahi, Physics, chemistry and synthesis methods of nanostructured bismuth ferrite (BiFeO3) as a ferroelectro-magnetic material, Progress in Solid State Chemistry 40(1) (2012) 6-15.##[10] M. Bernardo, Synthesis, microstructure and properties of BiFeO, Boletin de la Sociedad Española de 1 (2014) .##[11] S. Li, Synthesis and Functional Properties Of BiFeO₃ And Bi₂FeCrO₆ Based Nanostructures and Thin Films, Institut National de la Recherche Scientifique (Canada), 2014.##[12] Z. Hu, D. Chen, S. Wang, N. Zhang, L. Qin, Y. Huang, Facile synthesis of Sm-doped BiFeO3 nanoparticles for enhanced visible light photocatalytic performance, Materials Science and Engineering: B 220 (2017) 1-12 .##[13] Y. Zhang, Y. Wang, J. Qi, Y. Tian, M. Sun, J. Zhang, T. Hu, M. Wei, Y. Liu, J. Yang, Enhanced Magnetic Properties of BiFeO3 Thin Films by Doping: Analysis of Structure and Morphology, Nanomaterials, 2018.##[14] R. Zhang, S. Liu, F. Kong, J. Tong, L. Ruan, Q. Duan, J. Zhou, X. Zhang, α-Fe2O3/BiFeO3 composites as visible-active photocatalysts and their optical response mechanism, Journal of Physics and Chemistry of Solids 141 (2020) 109329.##[15] N.R. Niloy, M. Chowdhury, S. Anowar, J. Islam, M. Rhaman, Structural and optical characterization of multiferroic bifeo3 nanoparticles synthesized at different annealing temperatures, (2020).##[16] L. Yin, W. Mi, Progress in BiFeO3-based heterostructures: materials, properties and applications, Nanoscale 12(2) (2020) 477-523.##[17] S. Ramazanov, D. Sobola, F. Orudzhev, A. Knápek, J. Polčák, M. Potoček, P. Kaspar, R. Dallaev, Surface Modification and Enhancement of Ferromagnetism in BiFeO3 Nanofilms Deposited on HOPG, Nanomaterials, 2020.##[18] A. Nageena, A. Manzoor, A.M. Afzal, M.I. Arshad, A. Shahzad, M. Kashif, Investigation of dielectric, magnetic and electrical behavior of BFO/GNPs nano-composites synthesized via sol-gel method, Journal of Materials and Physical Sciences 3(2) (2022) 59-70.##[19] M. Zahid, N. Nadeem, M.A. Hanif, I.A. Bhatti, H.N. Bhatti, G. Mustafa, Metal Ferrites and Their Graphene-Based Nanocomposites: Synthesis, Characterization, and Applications in Wastewater Treatment, in: K.A. Abd-Elsalam, M.A. Mohamed, R. Prasad (Eds.),Magnetic Nanostructures : Environmental and Agricultural Applications, Springer International Publishing, Cham, 2019, pp. 181-212.##[20] Y. Subramanian, V. Ramasamy, R.J. Karthikeyan, G.R. Srinivasan, D. Arulmozhi, R.K. Gubendiran, M. Sriramalu, Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst, Heliyon 5(6) (2019) .##[21] L. Bai, M. Sun, W. Ma, J. Yang, J. Zhang, Y. Liu, Enhanced Magnetic Properties of Co-Doped BiFeO3 Thin Films via Structural Progression, Nanomaterials, 2020.##[22] R.V. William, A. Marikani, K. Gangatharan, Investigation of Multiferroic BiFeO3 Nanorods Using 2-MOE(C3H8O2)-Assisted Citrate Sol–Gel Method, International Journal of Nanoscience 18(05) (2018) 1850029.##[23] H. Ke, W. Wang, Y. Wang, J. Xu, D. Jia, Z. Lu, Y. Zhou, Factors controlling pure-phase multiferroic BiFeO3 powders synthesized by chemical co-precipitation, Journal of Alloys and Compounds 509(5) (2011) 2192-2197.##[24] T.-y. Liu, Y. Xu, J. Zhao, Low‐Temperature Synthesis of BiFeO3 via PVA Sol–Gel Route, Journal of the American Ceramic Society 93 (2010) 3637-3641.##[25] M.A. Wahba, S.M. Yakout, A.M. Youssef, W. Sharmoukh, A.M.E. sayed, M.S. Khalil, Chelating Agents Assisted Rapid Synthesis of High Purity BiFeO3: Remarkable Optical, Electrical, and Magnetic Characteristics, Journal of Superconductivity and Novel Magnetism 35(12) (2022) 3689-3704.##[26] J. Yi, L. Liu, L. Shu, Y. Huang, J.F. Li, Outstanding Ferroelectricity in Sol-Gel-Derived Polycrystalline BiFeO(3) Films within a Wide Thickness Range, ACS Appl Mater Interfaces 14(18) (2022) 21696-21704.##[27] J.L. Ortiz-Quiñonez, D. Díaz, I. Zumeta-Dubé, H. Arriola-Santamaría, I. Betancourt, P. Santiago-Jacinto, N. Nava-Etzana, Easy Synthesis of High-Purity BiFeO3 Nanoparticles: New Insights Derived from the Structural, Optical, and Magnetic Characterization, Inorganic Chemistry 52(18) (2013) 10306-10317.##[28] Y. Zhang, B. Li, Y. Jia, High Humidity Response of Sol–Gel-Synthesized BiFeO3 Ferroelectric Film, Materials, 2022.##[29] C. Zhao, H. Zhang, X. Cheng, Spectroscopic study on the valence state of Fe in BiFeO3, Journal of Solid State Chemistry 311 (2022) 123145.##[30] Z. Chen, G. Zhan, X. He, H. Yang, H. Wu, Low-temperature preparation of bismuth ferrite microcrystals by a sol-gel-hydrothermal method, Crystal Research and Technology 46(3) (2011) 309-314.##[31] S. Li, Y.-H. Lin, B.-P. Zhang, Y. Wang, C.-W. Nan, Controlled Fabrication of BiFeO3 Uniform Microcrystals and Their Magnetic and Photocatalytic Behaviors, The Journal of Physical Chemistry C 114(7) (2010) 2903-2908.##[32] B. Sun, S. Mao, S. Zhu, G. Zhou, Y. Xia, Y. Zhao, Improved Rate and Cycling Performances of Electrodes Based on BiFeO3 Nanoflakes by Compositing with Organic Pectin for Advanced Rechargeable Na-Ion Batteries, ACS Applied Nano Materials 1(3) (2018) 1291-1299.##[33] L. Hou, K. Zuo, Q. Sun, Z. Ren, Y. Zeng, X. Li, Effects of external magnetic field on the morphology and magnetic property of BiFeO3 particles prepared by hydrothermal synthesis, Applied Physics Letters 102(8) (2013) .##[34] J.F. Dai, T. Xian, L.J. Di, H. Yang, Preparation of BiFeO3-Graphene Nanocomposites and Their Enhanced Photocatalytic Activities, Journal of Nanomaterials 2013(1) (2013) 642897.##[35] Navjot, A. Tovstolytkin, G.S. Lotey, Plasmonic Enhanced Photocatalytic Activity of Ag Nanospheres Decorated BiFeO3 Nanoparticles, Catalysis Letters 147(7) (2017) 1640-1645.##[36] A.S. Abdelhamid, R.H. Alzard, L.A. Siddig, A. Elbahnasy, D. Aljazmati, Z. Kadoura, H. Zeidane, R. Elshikh, A. Alzamly, Facile Synthesis, Characterization, and Photocatalytic Performance of BiOF/BiFeO3 Hybrid Heterojunction for Benzylamine Coupling under Simulated Light Irradiation, Photochem, 2023, pp. 187-196.##[37] A.Y. Tuluk, T.R. Mahon, S.v.d. Zwaag, P. Groen, BiFeO3 synthesis by conventional solid-state reaction, 2019 IEEE International Symposium on Applications of Ferroelectrics (ISAF), 2019, pp. 1-4.##[38] M. Valant, A.-K. Axelsson, N. Alford, Peculiarities of a Solid-State Synthesis of Multiferroic Polycrystalline BiFeO3, Chemistry of Materials 19(22) (2007) 5431-5436.##[39] M.K. Sharif, M.A. Khan, A. Hussain, F. Iqbal, I. Shakir, G. Murtaza, M.N. Akhtar, M. Ahmad, M.F. Warsi, Synthesis and characterization of Zr and Mg doped BiFeO3 nanocrystalline multiferroics via micro emulsion route, Journal of Alloys and Compounds 667 (2016) 329-340.##[40] R.K. Upadhyay, A.P. Singh, D. Upadhyay, A. Kumar, C. Kumar, S. Jit, BiFeO3/CH3NH3PbI3 Perovskite Heterojunction Based Near-Infrared Photodetector, IEEE Electron Device Letters 40(12) (2019) 1961-1964.##[41] H. Han, J.H. Lee, H.M. Jang, Low-Temperature Solid-State Synthesis of High-Purity BiFeO3 Ceramic for Ferroic Thin-Film Deposition, Inorganic Chemistry 56(19) (2017) 11911-11916.##[42] E. Gil-González, A. Perejón, P.E. Sánchez-Jiménez, M.J. Sayagués, R. Raj, L.A. Pérez-Maqueda, Phase-pure BiFeO3 produced by reaction flash-sintering of Bi2O3 and Fe2O3, Journal of Materials Chemistry A 6(13) (2018) 5356-5366 .##[43] L. Fei, Chemical synthesis and characterization of bismuth ferrite nanostructures, (2011).##[44] R.L. Palomino-Resendiz, A.M. Bolarín-Miró, F. Pedro-García, F. Sánchez-De Jesús, J.P. Espinós-Manzorro, C.A. Cortés-Escobedo, Analysis of the effect of cationic ratio Bi3+/Fe3+ on the magnetic and multiferroic properties of BiFeO3 nanoparticles synthesized using a sonochemical-assisted method, Ceramics International 48(10) (2022) 14746-14753.##[45] S. Das, S. Rana, S.M. Mursalin, P. Rana, A. Sen, Sonochemically prepared nanosized BiFeO3 as novel SO2 sensor, Sensors and Actuators B: Chemical 218 (2015) 122-127.##[46] A. Das, S. De, S. Bandyopadhyay, S. Chatterjee, D. Das, Magnetic, dielectric and magnetoelectric properties of BiFeO3-CoFe2O4 nanocomposites, Journal of Alloys and Compounds 697 (2017) 353-360 .##[47] J. Silva, A. Reyes, H. Esparza, H. Camacho, L. Fuentes, BiFeO3: A Review on Synthesis, Doping and Crystal Structure, Integrated Ferroelectrics 126(1) (2011) 47-59.##[48] L. Di, H. Yang, T. Xian, X. Chen, Construction of Z-Scheme g-C3N4/CNT/Bi2Fe4O9 Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation, Micromachines, 2018.##[49] J. Li, Y. Wang, H. Ling, Y. Qiu, J. Lou, X. Hou, S.P. Bag, J. Wang, H. Wu, G. Chai, Significant Enhancement of the Visible Light Photocatalytic Properties in 3D BiFeO3/Graphene Composites, Nanomaterials, 2019.##[50] P. Banoth, B.P. Narsaiah, L. De Los Santos Valladares, J. Kargin, P. Kollu, Single-phase BiFeO3 and BiFeO3–Fe2O3 nanocomposite photocatalysts for photodegradation of organic dye pollutants, Nanoscale Advances 5(9) (2023) 2646-2656.##[51] S.V.V. Khikhlovskyi, G. Blake, The renaissance of multiferroics: bismuth ferrite (BiFeO3)–a candidate multiferroic material in nanoscience, University of Groningen 1(3) (2010).##[52] I. Calisir, A.A. Amirov, A.K. Kleppe, D.A. Hall, Optimisation of functional properties in lead-free BiFeO3–BaTiO3 ceramics through La3+ substitution strategy, Journal of Materials Chemistry A 6(13) (2018) 5378-5397##[53] H. Wu, J. Zhou, L. Liang, L. Li, X. Zhu, Fabrication, Characterization, Properties, and Applications of Low-Dimensional BiFeO3 Nanostructures, Journal of Nanomaterials 2014(1) (2014) 471485.[54] N. Wang, X. Luo, L. Han, Z. Zhang, R. Zhang, H. Olin, Y. Yang, Structure, Performance, and Application of BiFeO3 Nanomaterials, Nano-Micro Letters 12(1) (2020) 81 .##[55] S. Ali, M. Humayun, W. Pi, Y. Yuan, M. Wang, A. Khan, P. Yue, L. Shu, Z. Zheng, Q. Fu, W. Luo, Fabrication of BiFeO3-g-C3N4-WO3 Z-scheme heterojunction as highly efficient visible-light photocatalyst for water reduction and 2,4-dichlorophenol degradation: Insight mechanism, Journal of Hazardous Materials 397 (2020) 122708.##[56] R. Tao, C. Shao, X. Li, X. Li, S. Liu, S. Yang, C. Zhao, Y. Liu, Bi2MoO6/BiFeO3 heterojunction nanofibers: Enhanced photocatalytic activity, charge separation mechanism and magnetic separability, Journal of Colloid and Interface Science 529 (2018) 404-414.##[57] M.A. Marwat, H. Ullah, M. Usman, M.A. Ehsan, H. Zhang, M.F. Khan, S. Ali, M. Yousaf, Significantly improved photocatalytic activity of the SnO2/BiFeO3 heterojunction for pollutant degradation and mechanism, Ceramics International 48(10) (2022) 14789-14798.##[58] I.Y. Khairani, A.N. Arifiadi, J.-H. Lee, B. Bhoi, S.K.S. Patel, S.-k. Kim, Fabrication, structure, and magnetic properties of pure-phase BiFeO3 and MnFe2O4 nanoparticles and their nanocomposites, J. Magn 25(2) (2020) 140-149.##[59] B. Jana, K. Ghosh, K. Rudrapal, P. Gaur, P. Shihabudeen, A. Roy Chaudhuri, Recent progress in flexible multiferroics, Frontiers in Physics 9 (2022) 822005.##[60] Y. Si, Y. Li, J. Zou, X. Xiong, X. Zeng, J. Zhou, Photocatalytic Performance of a Novel MOF/BiFeO3 Composite, Materials, 2017.##[61] Y. Subramanian, V. Ramasamy, R.J. Karthikeyan, G.R. Srinivasan, D. Arulmozhi, R.K. Gubendiran, M. Sriramalu, Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst, Heliyon 5(6) (2019) e01831.##[62] T.N. Nhan Nguyen, K.-S. Chang, Piezoelectricity-enhanced multifunctional applications of hydrothermally-grown p-BiFeO3–n-ZnO heterojunction films, Renewable Energy 197 (2022) 89-100.##[63] Y.P. Bhoi, A.K. Nayak, S.K. Gouda, B.G. Mishra, Photocatalytic mineralization of carbendazim pesticide by a visible light active novel type-II Bi2S3/BiFeO3 heterojunction photocatalyst, Catalysis Communications 114 (2018) 114-119 .##[64] X. Jiang, Z. Wang, M. Zhang, M. Wang, R. Wu, X. Shi, B. Luo, D. Zhang, X. Pu, H. Li, A novel direct Z-scheme heterojunction BiFeO3/ZnFe2O4 photocatalyst for enhanced photocatalyst degradation activity under visible light irradiation, Journal of Alloysand Compounds 912 (2022) 165185 .##[65] H. Alijani, M. Abdouss, H. Khataei, Efficient photocatalytic degradation of toxic dyes over BiFeO3/CdS/rGO nanocomposite under visible light irradiation, Diamond and Related Materials 122 (2022) 108817.##[66] Y. Li, W. Yin, M. Li, J. Zhang, L. Chen, Multi-component Ag/AgCl/Bi2O3/BiFeO3 for the sunlight-induced photocatalytic degradation, Journal of Environmental Chemical Engineering 10(2) (2022) 107280.##[67] M. Ghorbani, S. Sheibani, H. Abdizadeh, M.R. Golobostanfard, Modified BiFeO3/rGO nanocomposite by controlled synthesis to enhance adsorption and visible-light photocatalytic activity, Journal of Materials Research and Technology 22 (2023) 1250-1267.##[68] S. Li, Y.-H. Lin, B.-P. Zhang, J.-F. Li, C.-W. Nan, BiFeO3/TiO2 core-shell structured nanocomposites as visible-active photocatalysts and their optical response mechanism, Journal of Applied Physics 105(5) (2009).##[69] F. Duan, Y. Ma, P. Lv, J. Sheng, S. Lu, H. Zhu, M. Du, X. Chen, M. Chen, Oxygen vacancy-enriched Bi2O3/BiFeO3 p-n heterojunction nanofibers with highly efficient photocatalytic activity under visible light irradiation, Applied Surface Science 562 (2021) 150171.##[70] L. Di, H. Yang, T. Xian, X. Liu, X. Chen, Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation, Nanomaterials, 2019.##[71] J. Tang, R. Wang, M. Liu, Z. Zhang, Y. Song, S. Xue, Z. Zhao, D.D. Dionysiou, Construction of novel Z-scheme Ag/FeTiO3/Ag/BiFeO3 photocatalyst with enhanced visible-light-driven photocatalytic performance for degradation of norfloxacin, Chemical Engineering Journal 351 (2018) 1056-1066 .##[72] X. Zhang, X. Wang, J. Chai, S. Xue, R. Wang, L. Jiang, J. Wang, Z. Zhang, D.D. Dionysiou, Construction of novel symmetric double Z-scheme BiFeO3/CuBi2O4/BaTiO3 photocatalyst with enhanced solar-light-driven photocatalytic performance for degradation of norfloxacin, Applied Catalysis B: Environmental 272 (2020) 119017.