Fe_(3)O_(4)纳米颗粒的共沉淀法制备及其性能研究

Synthesis and properties of Fe_(3)O_(4) nanoparticles by co-precipitation

目的:开发高效、清洁、经济的磁性纳米颗粒,进一步推动磁絮凝法在污水处理中的应用。方法:采用共沉淀法制备了四氧化三铁(Fe_(3)O_(4))纳米颗粒,研究了n(Fe^(3+))∶n(Fe^(2+))配比及反应温度对颗粒形貌、粒径、结构、表面官能团、Zeta电位等的影响,并测试了样品的磁性能。结果:n(Fe^(3+))∶n(Fe^(2+))配比为1.75∶1,反应温度为50℃时,共沉淀法制备Fe_(3)O_(4)纳米颗粒粒径为10~80 nm,晶型稳定,表面基团-OH较多,Zeta电位绝对值小;其饱和磁化强度为67.18 emu·g^(-1),矫顽力为3242.00 A·m^(-1),剩余磁化强度为4.47 emu·g^(-1)。结论:采用共沉淀法制备获得Fe_(3)O_(4)纳米颗粒,可作为优良的磁絮凝材料促进水中的絮凝反应。

Aims:This paper aims to develop efficient and clean magnetic nanoparticles for the magnetic flocculation application in wastewater treatment.Methods:Iron tetraoxide(Fe_(3)O_(4))nanoparticles were synthesized using the co-precipitation method.The effects of the iron source n(Fe^(3+))∶n(Fe^(2+))ratios and the reaction temperatures on the particle morphology,particle size,structure,surface functional groups,and zeta potentials were investigated.The magnetic properties of the samples were evaluated.Results:The co-precipitation method was used to prepare Fe_(3)O_(4) nanoparticle had the iron source n(Fe^(3+))∶n(Fe^(2+))ratio of 1.75∶1 at a reaction temperature of 50℃.The nanoparticles had the size of 10~80 nm,a stable crystalline morphology,a high number of surface groups(-OH),and a small absolute value of the zeta potential.The saturation magnetization strength of the nanoparticles was 67.18 emu·g^(-1).The coercive force was 3242.00 A·m^(-1),and the residual magnetization strength was 4.47 emu·g^(-1).Conclusion:The Fe_(3)O_(4) nanoparticle prepared by the co-precipitation method can be used as an excellent magnetic flocculant to facilitate water flocculation reaction.