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以Fe(NO_3)3·9H_2O为铁源,乙二醇为溶剂和还原剂,采用溶剂热法制备了Fe_3O_4磁性纳米颗粒.利用XRD、FT-IR和TEM对其进行了物相和形貌的表征,以4-氯苯酚(4-CP)为目标污染物,评价了其活化H_2O_2的性能.结果表明:制备的Fe_3O_4纳米颗粒近似呈球形,平均粒径约15 nm,能够有效地活化H_2O_2产生·OH并高效降解4-CP.在25℃,Fe_3O_4用量0.3 g·L~(-1),H_2O_2浓度1.6 mmol·L~(-1),初始pH=5.7时,所建立Fe_3O_4-H_2O_2氧化体系能在15 min内完全降解去除0.4 mmol·L~(-1) 4-CP,较相同条件下超声辅助反相共沉淀法制备的Fe_3O_4效果更好.Fe_3O_4活化H_2O_2降解4-CP的机理主要是因为新的溶剂热法可导致Fe_3O_4磁性纳米颗粒表面的富羟基化和配位作用.
Fe 3 O 4 magnetic nanoparticles were prepared by solvothermal method using Fe (NO 3) 3 · 9H 2 O as the iron source and ethylene glycol as the solvent and the reductant.The phase and morphology of the particles were characterized by XRD, FT-IR and TEM (4-CP) as the target pollutant, the performance of activated H_2O_2 was evaluated. The results showed that the prepared Fe_3O_4 nanoparticles were spherical and the average particle size was about 15 nm, which could effectively activate the production of H_2O_2 · OH and high-efficiency degradation of 4-CP. At 25 ℃, the dosage of Fe 3 O 4 0.3 g · L -1, the concentration of H 2 O 2 1.6 mmol·L -1, initial pH = 5.7, the oxidation system of Fe 3 O 4 -H 2 O 2 Can completely degrade and remove 0.4 mmol·L -1 4-CP within 15 min, which is better than that of Fe 3 O 4 prepared by ultrasonic assisted coprecipitation under the same conditions.The mechanism of Fe_3O_4 activation of H_2O_2 to degrade 4-CP is mainly Because of the new solvothermal method can lead to Fe 3 O 4 magnetic nanoparticles on the surface of hydroxylation and coordination.