微波高温处理对磁性草木灰磁性及其在水溶液中分散性和稳定性的影响

Effects of Microwave High-temperature Treatment on Magnetic Properties of Plant Ash and Its Dispersibility and Stability in Aqueous Solution

为探究磁性草木灰微波高温处理后的性能,以栀子花叶为原料,经过燃烧、研磨得到草木灰(PA)并通过化学沉淀法负磁制备磁性草木灰(MPA),MPA经微波高温处理得到微波-磁性草木灰(M-MPA)。采用XRD,FT-IR,Zeta,SEM-EDS以及VSM对MPA与M-MPA的结构和性能进行了分析与表征。结果表明:在m PA∶m Fe^(2+)∶m Fe^(3+)为2.5∶2∶1、微波高温时间4 min、温度1000℃时,MPA与M-MPA磁饱和强度分别为44.14,56.72 A·m^(2)/kg,说明MPA经微波高温处理后磁饱和强度明显增强;随着pH值增大,M-MPA在水溶液中的分散性与稳定性更好,明显优于MPA。微波高温处理使磁性草木灰的磁性增强且在水溶液中具有更好的分散性与稳定性。

In order to investigate the properties of magnetic plant ash after microwave high-temperature treatment,gardenia flower leaves were burned and ground to obtain plant ash(PA),and magnetic plant ash(MPA)was prepared using the chemical precipitation method.Microwave magnetic plant ash(M-MPA)was obtained using a high-temperature microwave treatment.The structures and properties of MPA and M-MPA were analyzed and characterized by XRD,FT-IR,Zeta,SEM-EDS,and VSM.The results show that when m PA∶m Fe^(2+)∶m Fe^(3+)is 2.5∶2∶1,microwave high temperature time is 4 min,and temperature is 1000℃,the magnetic saturation strength of MPA and M-MPA is 44.14 A·m^(2)/kg and 56.72 A·m^(2)/kg,respectively,indicating that the magnetic saturation strength of MPA is significantly enhanced after microwave high temperature treatment.With the increased pH value,M-MPA has better dispersibility and stability in aqueous solution,which is obviously better than that of MPA.Microwave high-temperature treatment enhances the magnetic properties of MPA and shows better dispersibility and stability in an aqueous solution.