The aim of the presented work is introducing a simple and rapid way with high profit not only to reduce expenses and efforts, but also to guarantee safety and eco-friendly biogas source. Thus, the effect of nanoferrites, as a source of metal ion, on biogas production rate was studied. Nanoferrites MFe₂O₄ (M = Fe, Ni, Co) were synthesized via a modified aqueous co-precipitation method under alkaline conditions using monoisopropanolamine (MIPA) as a base and capping agent. The prepared nanoparticles were investigated by transmission electron microscopy (TEM), X-ray diffractometry (XRD), and vibrating sample magnetometer (VSM). Anaerobic system was constructed from special bench-scale digesters for examination of the nanoferrite effect on biogas production rate. The TEM images showed ultra-small, spherically, slightly aggregated, and well-distributed nanoparticles in the range of 5.7, 4.9, and 3.5 nm for magnetite (Fe₃O₄), cobalt ferrite (CoFe₂O₄), and nickel ferrite (NiFe₂O₄) nanoparticles (NPs), respectively. XRD patterns confirmed the cubic spinel structure for the prepared nanoparticles. VSM measurements predicted the superparamagnetic behaviors for all prepared nanoparticles. The effects of Fe₃O₄, CoFe₂O₄, and NiFe₂O₄ NPs with same concentrations on biogas production were investigated and yielded biogas cumulative volumes of 210.8%, 220.5%, and 171.9%, respectively, with respect to control, after 50 days of incubation. CoFe₂O₄ nanoparticles showed the greatest enhanced effect on the cumulative biogas production, followed by Fe₃O₄ nanoparticles.

所介绍的工作的目的是引入一种简单、快速、高利润的方法，不仅可以减少费用和工作量，而且可以保证安全和环保的沼气来源。因此，研究了作为金属离子源的纳米铁氧体对沼气产率的影响。纳米铁氧体 MFe ₂ O ₄(M = Fe, Ni, Co) 在碱性条件下通过改进的水性共沉淀法合成，使用单异丙醇胺 (MIPA) 作为碱和封端剂。通过透射电子显微镜 (TEM)、X 射线衍射仪 (XRD) 和振动样品磁强计 (VSM) 对制备的纳米颗粒进行了研究。厌氧系统由特殊的台式消化器构成，用于检查纳米铁氧体对沼气生产率的影响。TEM 图像显示，磁铁矿 (Fe ₃ O ₄ )、钴铁氧体 (CoFe ₂ O ₄ ) 和镍铁氧体在 5.7、4.9 和 3.5 nm 范围内具有超小、球形、轻微聚集且分布良好的纳米颗粒(NiFe ₂ O ₄) 纳米粒子 (NPs)，分别。XRD 图案证实了制备的纳米颗粒的立方尖晶石结构。VSM 测量预测了所有制备的纳米粒子的超顺磁行为。研究了相同浓度的 Fe ₃ O ₄、CoFe ₂ O ₄和 NiFe ₂ O ₄ NPs 对沼气产量的影响，与对照相比，沼气累积量分别为 210.8%、220.5% 和 171.9%。经过50天的孵化。CoFe ₂ O ₄纳米颗粒对累积沼气产量的增强作用最大，其次是Fe ₃ O ₄纳米颗粒。