以溶胶-凝胶法和固相研磨法制备NiFe2O4磁性纳米颗粒,采用X射线粉末衍射仪、扫描电子显微镜、透射电子显微镜、X射线光电子能谱仪、震动样品磁强计等探讨了不同合成方法对其结构、晶型、形貌的影响,结果表明凝胶-溶胶法制得的NiFe2O4具有颗粒小、尺寸均匀、磁学性能优、催化性能好等特点.推测了NiFe2O4/H2O2类芬顿体系催化降解孔雀石绿的反应机理.考察了pH值、催化剂用量、氧化剂用量、反应时间等因素的影响,结果表明:对浓度为25 mg/L的孔雀石绿溶液,当NiFe2O4用量为0.05 g,H2O2用量为0.30 mL,pH为5,温度为298 K,反应时间为45 min,孔雀石绿脱色率在93％以上.动力学研究表明降解过程近似为一级反应,速率常数达0.057 min-1.
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