Fe-containing Composite Materials : Synthesis And Environmental Purifying Performance

Two types of materials are synthesized in this project and applied to environmental purifying purposes.Hence,the efficiency of different pollutants removal performance is investigated.Mesoporous graphite carbon nitride（g-C₃N₄）is prepared by sintering melamine under high temperature.α-Fe₂O₃/g-C₃N₄ composites are then synthesized by coprecipitation method.As-prepared samples are systematically characterized by XRD,HRTEM,UV-Vis DRS,BET and XPS methods followed by studies on Photocatalytic-oxidation/adsorption cooperative arsenic ion（As（III））removal performance.The result indicates enhanced photocatalytic property due to the forming of heterojunction betweenα-Fe₂O₃ and g-C₃N₄.As（III）is initially oxidized to better adsorbable As（V）then simultaneously adsorbed byα-Fe₂O₃.Whenα-Fe₂O₃ reaches20%in the composite,up to 99%of As（III）is removed.Photocatalytic oxidation mechanism research reveals superoxide radicals（·O₂）as the major active groupreveals the mechanism of the composite arsenic oxidation.Second part of the project requires synthesis of polyacrylonitrile（PAN）using acrylonitrileasprecursor,potassiumpersulfateasinitiatorand N,N’-methylenebisacrylamide as crosslinker.Prepared PAN is modified with hydroxylamine hydrochloride to acquire amidoxime polyacrylonitrile（AOPAN）.Characterization of the samples is conducted via FT-IR,SEM,BET and ASS to examine arsenic oxidation performance.Oxidation and adsorption cooperative As（III）removal performance of AOPAN-Fe/Cu-x is determined under the effect of H₂O₂.Lastly,research on methyl orange（as organic pollutants）catalytic degradation effect of AOPAN-Fe/Cu-x（as Fenton reagent）is performed.Research aspect includes namely,catalytic oxidation kinetics investigation;effect of adsorbent amount,H₂O₂amount,pH of the solution and initial concentration of methyl orange;reusability of the complex.