In this work, for the first time, the effect of magnetite morphology on magnetic and photocatalytic properties of magnetite-titania nanoparticles (Fe₃O₄-TiO₂ NPs) for waste-water purification was studied. Hydrothermal method was used to synthesize magnetite and magnetite-titania nanoparticles, using ferrosulfate heptahydrate and tetraubutyl orthotitanate as magnetite and titania precursors, respectively. X-ray diffractometry and scanning electron microscopy results revealed successful synthesis of spherical (Fe₃O_4S), cubic (Fe₃O_4C) and rod-like (Fe₃O_4R) NPs. Fe₃O_4C NPs had the highest (66.36 emu.g⁻¹) and Fe₃O_4R had the lowest (35.11 emu.g⁻¹) saturated magnetism. By depositing titania on the magnetite NPs, saturated magnetism was drastically reduced in the samples. The kinetics of photocatalytic methylene blue (MB) decoloration of the samples followed the first-order model. MB removal efficiency of Fe₃O₄-TiO₂ NPs with spherical, cubic and rod-like magnetite was more than 90, 73 and 64%, respectively, after 120 min irradiation, which shows an excellent improvement compared to similar works. It was interesting that the specific surface area of Fe₃O₄-TiO₂ NPs had a higher influence on photocatalytic activity compared to morphology. The results revealed that Fe₃O_4C-TiO₂ NPs had the highest magnetic saturation, while Fe₃O_4S-TiO₂ NPs had the highest photocatalytic activity. It was found that Fe₃O_4S-TiO₂ NPs had the optimal magnetic and photocatalytic properties, and may potentially be used for wastewater purification.

在这项工作中，首次研究了磁铁矿形态对用于废水净化的磁铁矿-二氧化钛纳米粒子 (Fe ₃ O ₄ -TiO _{2 NPs) 的磁性和光催化性能的影响。}采用水热法合成磁铁矿和磁铁矿-二氧化钛纳米颗粒，分别使用七水硫酸亚铁和原钛酸四丁酯作为磁铁矿和二氧化钛前驱体。X 射线衍射和扫描电子显微镜结果显示成功合成了球形 (Fe ₃ O _4S )、立方体 (Fe ₃ O _4C ) 和棒状 (Fe ₃ O _4R ) NP。Fe ₃ O _4CNPs 具有最高 (66.36 emu.g ^-1 ) 和 Fe ₃ O _4R具有最低 (35.11 emu.g ^-1 ) 饱和磁性。通过在磁铁矿 NPs 上沉积二氧化钛，样品中的饱和磁性显着降低。样品的光催化亚甲蓝 (MB) 脱色动力学遵循一级模型。球形、立方体和棒状磁铁矿对 Fe ₃ O ₄ -TiO ₂ NPs的 MB 去除效率在 120 分钟照射后分别超过 90%、73% 和 64%，与同类工作相比显示出极好的改进。_{有趣的是，Fe 3} O ₄ -TiO ₂的比表面积与形态相比，NPs 对光催化活性的影响更大。结果表明，Fe ₃ O _4C -TiO ₂ NPs 具有最高的磁饱和度，而 Fe ₃ O _4S -TiO ₂ NPs 具有最高的光催化活性。发现 Fe ₃ O _4S -TiO ₂ NPs 具有最佳的磁和光催化性能，并可能用于废水净化。