Advances in Structural Properties，Synthesis，Characterization and Environmental Applications of Nano-Magnetite Colloids

Key Points

• The aim is to summarize the physical and chemical properties of nano-magnetite colloids and their environmental applications.
• Summarized crystal structure, electronic valence states, magnetic properties, thermodynamic properties, and particle size effects.
• Reviewed traditional synthesis methods like co-precipitation and high-temperature thermal decomposition and advanced methods for fine-tuning size and morphology.
• Discussed environmental applications, focusing on degradation of organic pollutants, microbial reduction of heavy metals, and regulation of plant photosynthesis and stress tolerance.
• Established that nano-magnetite colloids demonstrate high catalytic activity and stability, with improved magnetic responsiveness through selective growth and surface modifications.
• Identified challenges regarding long-term stability and phase evolution of materials in real pollution sites remain unassessed.
• Emphasized the need for further exploration into interface reaction mechanisms and establishing quantitative relationships for effective environmental remediation.