Co₂Z Ferrite And Co₂U Ferrite Prepared By Coprecipitationmethod And Its Adsorption

The Co₂Z and Co₂U ferrite was prepared by coprecipitaion method.The structure and appearance of Z-type and U-type ferrite was characterized by XRD and SEM,the influencing factors were investigated to confirm the best condition.The adsorption activity of Co2Z ferrite and Co2U ferrite on dye waste was studied for the first time.The factors of p H value,initial concentration,adsorption time and adsorbent dosage were discussed in detail.The isotherm models?Frenundlich and Langmuir?and thermodynamic parameters were also analyzed to describe the adsorptive behavior of the adsorbents?Methylene Blue,Congo Red,Malachite Green oxalate?.The results are as followings:Using Ba?NO₃?₂,Fe?NO₃?₃.9H₂O,Co?NO₃?₂.6H₂O as raw materials,the Co₂Z ferrite was prepared by coprecipitaion method under condition that the pH value was12 and the calcination temperature was 1300?in 4 hours.As to Co₂Z ferrite,the results of the adsorption experiments were as follows:1)the Methylene Blue removal rate was 89.49%,the adsorbent amount was 9.18mg/g,and the saturated adsorption capacity of monolayer was 10.56mg/g,under the condition of room temperature and the dye concentration was 10mg/L,the pH value was 12,the adsorption time was 12hours and the adsorbent concentration was 1.0g/L.2)the Congo Red removal rate was70.65%,the adsorbent amount was 39.11mg/g,and the saturated adsorption capacity of monolayer was 45.64mg/g,under the condition of room temperature and the dye concentration was 10mg/L,the pH value was 6,the adsorption time was 6 hours and the adsorbent concentration was 1.0g/L.The result shows that the adsorption on Methylene Blue and Congo Red were both fitted the Langmuir isotherm and it could be described by Langmuir isotherm model.Thermal regeneration showed that the Z type ferrite could be used for five desorption-adsorption cycles with high removal efficiency for Methylene Blue and Congo Red.Adsorption regeneration in Methylene Blue after 5 times,the adsorption rate was 82.3%,as in Congo Red was 62.32%Using Ba?NO₃?₂,Fe?NO₃?₃.9H₂O,Co?NO₃?₂.6H₂O as raw materials,the Co₂U ferrite was prepared by coprecipitaion method under condition that the pH value was10 and the calcination temperature was 1200?in 4 hours.As to Co₂U ferrite,the results of the adsorption experiments were as follows:1)the Methylene Blue removal rate was 58.22%,the adsorbent amount was 5.40mg/g,and the saturated adsorption capacity of monolayer was 5.16mg/g,under the condition of room temperature and the dye concentration was 10mg/L,the pH value was 12,the adsorption time was 21hours and the adsorbent concentration was 1.0g/L.2)the Malachite Green oxalate removal rate was 98.21%,the adsorbent amount was 69.84mg/g,and the saturated adsorption capacity of monolayer was 74.46mg/g,under the condition of room temperature and the dye concentration was 20mg/L,the pH value was 8,the adsorption time was 9 hours and the adsorbent concentration was 1.0g/L.The result shows that the adsorption on Methylene Blue and Malachite Green oxalate were both fitted the Langmuir isotherm and it could be described by Langmuir isotherm model.Thermal regeneration showed that the U type ferrite could be used for five desorption-adsorption cycles with high removal efficiency for Methylene Blue and Malachite Green oxalate.Adsorption regeneration in Methylene Blue after 5 times,the adsorption rate was 50.12%,as in Malachite Green oxalate was 95.60%.Results of this work indicated that ferrite was effective for dye removal from aqueous solution and was potential absorbent for dye wastewater.Therefore,Z type and U type ferrite can be used as adsorbent for dye wastewater decolonization.Due to its resue and easy separation,it has good application prospect.