The metal hydrazine precursor of Ni_0.9Mn_0.1Fe₂O₄ nanoparticles was prepared through co-precipitation technique. Infrared spectrum of the precursor was showed the bridging bidentate nature of hydrazine. Multistep endothermic mass loss was observed from the thermogravimetric–differential thermogravimetric curves of the precursor. Ni_0.9Mn_0.1Fe₂O₄ nanoparticles synthesized from the precursor using thermal decomposition technique were characterized by infrared spectroscopy, energy-dispersive spectroscopy, powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry and UV-diffuse reflectance spectroscopy which proposed the phase structure, morphology, magnetic and optical properties. An effective photocatalytic activity has shown by Ni_0.9Mn_0.1Fe₂O₄ nanoparticles on Congo red, malachite green, methylene blue, methyl red, rhodamine B and rose bengal under direct sunlight at different time intervals. The nanoparticles were magnetically separated and showed good recycling ability.

通过共沉淀技术制备了Ni _0.9 Mn _0.1 Fe ₂ O ₄纳米粒子的金属肼前体。前体的红外光谱显示肼的桥接二齿性质。从前体的热重-差热重曲线可以观察到多步吸热质量损失。Ni _0.9 Mn _0.1 Fe ₂ O ₄通过红外光谱，能量分散光谱，粉末X射线衍射，扫描电子显微镜，透射电子显微镜，振动样品磁法和紫外-漫反射光谱对通过热分解技术由前驱体合成的纳米颗粒进行了表征，提出了相结构，形态，磁性和光学性质。Ni _0.9 Mn _0.1 Fe ₂ O ₄纳米颗粒对刚果红，孔雀石绿，亚甲基蓝，甲基红，若丹明B和玫瑰红在不同时间间隔的阳光下具有有效的光催化活性。纳米颗粒被磁性分离并显示出良好的再循环能力。