【摘要】 通过一步溶剂热法制备了磁性纳米材料Ag@Fe₃O₄,采用透射电镜（TEM）、扫描电镜（SEM）、X射线能谱（EDX）对样品的结构和形貌进行表征。结果表明,Ag@Fe₃O₄具有核壳型花状结构,单个颗粒花状结构的粒径约为100 nm,以粒径约为40 nm的Ag为内核,在其外层包覆的Fe₃O₄粒径约为30～60 nm。利用Ag@Fe₃O₄纳米材料中的Ag核能被H₂O₂氧化为Ag⁺并引起吸收光谱吸光度值变化的特点,建立了光度法快速检测过氧化氢的方法。在过氧化氢浓度为0.5～200μmol/L范围内,其浓度值与吸光度呈良好的线性关系,浓度与吸光度关系方程为y=-0.001 63c+0.626,相关系数（r²）为0.998 2,检出限为0.3μmol/L;方法用于自来水样品中过氧化氢检测时,其回收率为95.2%～96.1%,相对标准偏差（RSD）<5.0%。更多还原

【Abstract】 Ag@Fe₃O₄ magnetic nanomateria was prepared by one step solvothermal method. The structure and morphology of samples were characterized by transmission electron microscopy（TEM）, scanning electron microscopy（SEM） and energy dispersive X-ray spectroscopy（EDX）. The results showed that Ag@Fe₃O₄ has a core-shell flower structure and one flower structure is about 100 nm in size. Ag with a particle size of about 40 nm is used as the core, and Fe₃O₄ with a size of 30-60 nm is coated on the outer layer. A new method for rapid determination of hydrogen peroxide by spectrophotometry was established based on the characteristics that Ag core in Ag@Fe₃O₄ can be oxidized by H₂O₂ to Ag⁺ so as to cause the change of UV absorbance. Under the optimal conditions, the concentration of hydrogen peroxide in the range of 0.5～200 μmol/L has a good linear relationship with the absorbance. The relationship equation is y=-0.001 63c+0.626, the correlation coefficient（r²） is 0.998 2 and the detection limit is 0.3 μmol/L. When the method was applied to determine hydrogen peroxide in tap water samples, the recovery was 95.2%～96.1% with relative standard deviation（RSD）<5.0%.更多还原