The Fe3O4 nanomaterials were green-synthesized by the peels extract of Citrus reticulata as the reducing agent and stabilizer.The physical and chemical properties of Fe3O4 nanomaterials were characterized with scanning electron microscope(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and the adsorp-tion performance of Malachite Green was investigated.The results show that green synthetic nano-Fe3O4 is an irregu-lar sphere with good dispersion and crystallinity.The adsorption rate of MG can reach 95.33％when the adsorption time of 2 h,solution pH of 4,material dosage of 20 mg,MG concentration of 20 mg/L,at 25 ℃.The results showed that the adsorption kinetics and adsorption isotherm of MG adsorption by nano-Fe3O4 were mainly inaccordance with the pseudo-second-order kinetics model,and Langmuir model.Thermodynamic studies showed that the adsorption process of MG onto nano-Fe3O4 was an endothermic process with spontaneous.The adsorption rate can reach more than 70％after reuse for 4 times.
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