The Preparation And Evaluation Of Red Mud Loaded Ferrate (?) Water Treatment Agent

The red mud?RM?was modified by roasting and acid-dissolution followed by alkaline-precipitation?AA?,respectively.Two kinds of modified RM were obtained,namely R-RM and AA-RM.The samples were analyzed by particle size analysis,X-ray fluorescence spectroscopy?XRF?,N₂ adsorption,thermal analysis?TG-DSC?,X-ray diffraction spectroscopy?XRD?,Fourier transform infrared spectroscopy?FT-IR?and scanning electron microscopy?SEM?technologies.And the adsorption effect of modified RMs was evaluated using simulated methylene blue?MB?wastewater.The results show that both of roasting temperature and time significantly affect the modification of RM.Roasting leads to the decomposition of the carbonates and the evaporation of the adsorbed water,which contributing to the formation of holes and the reduction of the mass transfer resistance in the particles.When RM was modified by AA,the effect was obviously influenced by the adding mode and the concentration of ammonia.The metal oxides in RM are transformed to loose hydroxide precipitates,which resulting in the increase of the porosity and the adsorption sites.Both of R-RM and AA-RM have a better adsorption effect on MB than raw RM.In addition,the key factors that influencing the fabrication of ferrate?Fe????were also studied.The compound water treatment agents were prepared by solution impregnation method with RM and modified RMs as carriers,namely Fe???/RM,Fe???/R-RM and Fe???/AA-RM.The water treatment effect of these materials were assessed using simulated MB wastewater.The results show that the Fe???and compound agents can be efficiently synthesized by adjusting the appropriate process parameters.And the modified RMs loaded ferrate???composite materials can effectively remove the MB dye in aqueous solution.