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Background and purpose: According to thetheory ofsustainable development, protect the environmentforcurrent and futuregenerationsisinevitable. Chromium (VI) is one of the pollutant of waterthatcauseharm totheaqueous environmentandrisksfor human health, animalsand plants. The purpose of this study was tosynthesis of Fe3O4 nanoparticlesand evaluateofCr (VI) adsorptionon Nanoparticle ssynthesizedasanadsorbent. Materials and methods: Inthisexperimental- laboratorystudy, nanoparticleswere synthesized bychemicalco-precipitation method and as an adsorbent was studiedforadsorptionof Cr (VI).The resulted nanomaterials were characterized by SEM, XRD and FT-IR. Effects ofpH, contacttime, adsorbentdoses andinitial Cr (VI) concentration werestudied. The resulting data were described by the Langmuir and Freundlich isotherm models and for Data analysis was used from Excel software. Results: The results showedthat thecharacterization ofnanoparticleswereas expectedandthe best of removal performance in pH= 2, at contact time equal10 min, adsorbentdose of 1g/L and initial Cr (VI) concentration of50 mg/L.The Pattern of Cr (VI) adsorption was fitted with the Freundlich model and Adsorption processes followed the pseudo second-order kinetics. Conclusion: chemical co-precipitation Synthesis methodbased onlow power consumptionandShort time isaappropriate methodandFe3O4nanoparticlessynthesizedby this methodcan be used as asuitable optionfor theadsorptionof Cr (VI).

Keywords: Fe3O4 nanoparticles, hexavalent chromium, Isotherm, Kinetics

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