The Synthesis Of Chitosan Magnetic Nanoparticles For Dyes Adsorption

Chapter 1: This chapter briefly introduced the structure,properties,andapplication of chitosan;the preparation and modified methods of Fe₃O₄nanoparticals;the preparation and application of chitosan/Fe₃O₄ nanoparticals.Chapter 2: Magnetic chitosan nanoparticles?Fe₃O₄-CS MNPs?were synthesized by an improved one-pot hydrothermal method and applied for azo dyes methyl orange and amido black 10 B adsorption.The as-prepared Fe₃O₄-CS MNPs were characterized by transmission electron microscope?TEM?,scanning electron microscope?SEM?,X-ray powder diffraction?XRD?,fourier transform infrared spectroscopy?FTIR?,thermal gravimetric analysis?TGA?,vibrating sample magnetometer?VSM?.These characterization methods proved Fe₃O₄-CS MNPs were synthesised successfully.Chapter 3: The adsorptive behavior of azo dye on Fe₃O₄-CS MNPs was investigated using the UV-vis specteophotometric technique and the affecting parameters including solution pH,Fe₃O₄-CS MNPs amount,azo dye concentration and contact time were examined.The adsorption process followed the pseudo-second-order kinetic model.The adsorption equilibrium data fitted well with the Freundlich isotherm model.The saturated adsorption capacity of methyl orange was 93.83 mg/g.The saturated adsorption capacity of amido black 10 B was 124.8 mg/g.The results showed that Fe₃O₄-CS MNPs possessed a simple synthesis route,high adsorption efficiency,and excellent reusability.Which have potential for applying in the adsorption of azo dye in environmental effluents.Chapter 4: Flaky magnetic chitosan nanoparticles?Fe₃O₄-CS Ns?were synthesized by a facile one-pot hydrothermal method and applied for azo dyes methyl orange and amido black 10 B adsorption.The as-prepared Fe₃O₄-CS Ns were characterized by transmission electron microscope?TEM?,fourier transform infrared spectroscopy?FTIR?,thermal gravimetric analysis ?TGA?,vibrating sample magnetometer?VSM?.These characterization methods proved Fe₃O₄-CS Ns were synthesisedsuccessfully.Chapter 5: The adsorptive behavior of azo dye on Fe₃O₄-CS Ns was investigated using the UV-vis specteophotometric technique and the affecting parameters including solution pH,Fe₃O₄-CS Ns amount,azo dye concentration and contact time were examined.The adsorption process followed the pseudo-second-order kinetic model.The adsorption equilibrium data fitted well with the Freundlich isotherm model.The desorption of the amido black 10 B could be carried out by using 0.1 M NaOH.The saturated adsorption capacity of methyl orange was 325.61 mg/g.After four cycles,adsorption capacity still reached 187.22 mg/g.The saturated adsorption capacity of amido black 10 B was 389.97 mg/g.After five cycles,adsorption capacity still reached 248.30 mg/g.The results showed that Fe₃O₄-CS Ns possessed a simple synthesis route,high adsorption efficiency,and excellent reusability.Which have potential for applying in the adsorption of azo dye in environmental effluents.Chapter 6: Summarized the structures and adsorption properties towards the model moleculars of the two magnetic nanocomposites,and forecasted the possible research directions of magnetic nanocomposites infuture.