Effectiveness and mechanism of Ba0.5Sr0.5FeO3-δ in treatment of uranium-containing wastewater
BSF(Ba0.5Sr0.5FeO3-δ)perovskite material was synthesized by the sol-gel method,and its performance was examined in treating uranium-containing wastewater,while also delving into its adsorption mechanism for U(Ⅵ).The results indicate that when the dosage of BSF is 0.8 g/L,the initial pH of uranium-containing wastewater is 5,and the reaction time is 15 min,the treatment efficiency for uranium-containing wastewater with an initial mass concentration of 10 mg/L can reach 97.38％.The kinetic and thermodynamic fitting analysis reveal that the adsorption process of U(Ⅵ)by BSF involves both physical and chemical adsorption,with chemical adsorption being predominant.The maximum theoretical adsorption capacity is calculated as 181.83 mg/g.SEM and EDS indicate the presence of a well-developed pore structure in BSF,where uranyl ions are primarily adsorbed within the surface pore structure.XPS demonstrates that during the removal of U(Ⅵ),Fe2+in BSF facilitates the conversion of a portion ofU(Ⅵ)toU(Ⅳ).Comparatively,among other adsorption materials,BSF exhibites notable efficiency and rapidity in removing uranyl ions.This underscores the potential of BSF as a highly effective adsorption material for the removal of U(Ⅵ).
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