海藻酸钠固定单宁酸生物质膜的制备及其对铀吸附行为研究

Preparation of Sodium Alginate Fixed Tannic Acid Biofilm Membranes and Its Uranium Adsorption Behavior

通过Fe^(3+)与单宁酸(TA)原位反应,将TA固定于海藻酸钠(SA)基体中,合成SA-Fe^(3+)-TA复合生物质膜,用于吸附富集水溶液中的铀。采用SEM、FTIR和XPS对合成材料进行了表征,考察了合成条件、溶液pH、铀酰离子初始质量浓度和温度等条件对其铀吸附性能的影响。结果表明,SA质量浓度为10 mg/mL且TA质量浓度为5 mg/mL时合成的SA-Fe^(3+)-TA复合生物质膜在25℃、溶液pH为6、铀酰离子初始质量浓度为20 mg/L和固液比为0.025 g/L的初始条件下,铀最大吸附量为586 mg/g,且吸附行为分别符合Langmuir模型和准二级动力学模型。该SA-Fe^(3+)-TA复合生物质膜具有成本低、制备简单和吸附容量高等优点,有望用于处理放射性废水中的铀。

Tannic acid(TA)was fixed in sodium alginate(SA)matrix by in-situ reaction of Fe ^(3+)to synthesis SA-Fe ^(3+)-TA composite biomass membranes for uranium adsorption and enrichment in water.The synthetic materials were characterized by SEM,FTIR and XPS measurements.Effect of synthesis condition,pH value,initial uranium mass concentration and temperature on uranium adsorption capacity of synthetic material were investigated.The results showed that SA-Fe ^(3+)-TA composite biomass membrane synthesized at SA mass concentration of 10 mg/mL and TA mass concentration of 5 mg/mL had maximum uranium adsorption capacity of 586 mg/g under the initial conditions of 25℃,pH 6,initial mass concentration of uranyl ion of 20 mg/L and solid-liquid ratio of 0.025 g/L.The adsorption process fitted the Langmuir model and pseudo-second-order kinetic model,respectively.SA-Fe ^(3+)-TA composite biomass membrane has been expected to be used to treat uranium in radioactive wastewater due to the advantages of low cost,simple preparation and high adsorption capacity.