关键词: 铁氧化物, Cu(Ⅱ ), 吸附动力学, 吸附等温线, Cu(Ⅱ )运移

Abstract: In order to study the removal performance of goethite,hematite,magnetite and ferrihydrite on Cu(Ⅱ ) in simulated Cu(Ⅱ ) contaminated wastewater,four kinds of iron oxides were characterized by XRD,FTIR,BET specific surface area and potentiometric titration. The adsorption performance of four kinds of iron oxides on Cu(Ⅱ ) was compared by static and dynamic migration tests. The results showed that :① When the dosage was 1 g / L and the initial concentration of Cu(Ⅱ ) was 50 mg / L,the adsorption saturation time of Cu(Ⅱ ) by four iron oxides was 30 min. The adsorption effect of Cu(Ⅱ ) was significant under weak acidic conditions. The equilibrium adsorption rates of Cu(Ⅱ ) by goethite,hematite,ferrihydrite and magnetite were 61. 02%,50. 72%,70. 58% and 46. 65%,respectively. ② The adsorption process of goethite and ferrihydrite on Cu(Ⅱ ) is monolayer chemical adsorption,while hematite and magnetite are more in line with Freundlich equation,which is dominated by non-uniform multi-layer chemical adsorption. ③ During the migration process,Cu(Ⅱ ) mainly accumulated in the surface and middle layers of the soil column containing adsorbents,and was much larger than that in the deep layer. The retardation and adsorption capacity of ferrihydrite to Cu(Ⅱ ) was better than that of goethite. ④ The adsorption performance of four kinds of iron oxides on Cu(Ⅱ ) from good to bad was ferrihydrite,goethite,hematite and magnetite.

Key words: iron oxide,Cu(Ⅱ ),adsorption kinetics,adsorption isotherm,Cu(Ⅱ ) migration