URANIUM ADSORPTION MECHANISM AT THE WATER-ALBITE INTER-FACE IN PHOSPHORUS-RICH WATER SYSTEM
The paper investigates the adsorption mechanism of uranium in phosphorus-rich water at the water-albite interface,focusing on the influence of pH value,total phosphate concentration,solid-liquid ratio,and ionic strength through adsorption experiments.The findings are as follows:the strongest ad-sorption of uranium by albitite occurs when the total phosphate concentration is 0.2 mg/L,the solid-liquid ratio is 10 g/L,the ionic strength is 0.1 mol/L,and the pH is 4.0,with a maximum adsorption percent-age of 95％.In acidic conditions,phosphate solution enhances uranium adsorption to albite compared to a phosphate-free solution.Conversely,under alkaline conditions,when phosphate concentration is low,ura-nium adsorption by albite is stronger than in the absence of phosphate.However,at high phosphate con-centrations,uranium adsorption by albite weakens.At pH values between 2 and 4,changes in ionic strength minimally affect uranium adsorption.In contrast,at pH values between 4 and 11,increasing ion-ic strength significantly improves albite's adsorption capacity for uranium.Albite's adsorption of uranium increases with the solid-liquid ratio when pH is less than 4 or less than 2.However,at pH values between 4 and 11,the adsorption capacity reaches its peak at a solid-liquid ratio of 10 g/L.These findings not only contribute to understanding uranium migration and transformation in phosphorus-rich water bodies but al-so provide valuable insights into addressing uranium pollution in phosphate ores.
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