N235浸渍树脂的制备及对钒的吸附研究

Preparation of N235 Impregnated Resin and Its Adsorption for Vanadium

以N235为萃取剂，XAD-16HP多孔吸附树脂为载体，制备了N235浸渍树脂，确定了最佳的萃取剂浓度为50％。采用静态吸附实验法探究了在硫酸体系下溶液pH、钒浓度、吸附温度及时间等因素对N235浸渍树脂吸附钒的影响。研究结果表明：N235浸渍树脂吸附V（V）的最佳pH为1．8左右。V（V）的等温吸附曲线符合Freundlich等温吸附模型。V（V）的吸附反应为吸热反应。25℃条件下，N235浸渍树脂对V（V）的吸附平衡时间为10h。N235浸渍树脂循环使用过程中，开始吸附容量有明显的下降，循环7次后吸附容量趋于稳定，循环9次后吸附容量为初始的77．83％，这表明N235浸渍树脂多次循环使用后仍保持较高的吸附容量，可用于含钒溶液的分离富集。

Solvent impregnated resins（SIRs） were prepared using XAD-16HP macroporous adsorption resins as matrix and N235 as extractant. The optimum concentration of the extractant was 50%. The effects of solution pH value, vanadium concentration, adsorption temperature and contact time on absorption of vanadium in sulfuric acid solutions onto N235-impregnated resins were investigated through static adsorption experiments. The results showed that the optimum pH value of solution for absorbing vanadium（ V）was about 1.8. The adsorption isotherm of vanadium （V）was fit to Freundlieh isotherm model. The adsorption reaction for vanadium （V） was endothermic. Under the condition of 25 ~C , the adsorption equilibrium time of vanadium （V） for N235-impregnated resins was 10 h. During the cycle of N235-impregnated resins, the adsorbing capacity of vanadium declined remarkably in the previous several cycles, but the adsorption capacity tended to be stable after the seventh cycles. The adsorption capacity was 77.83% of the initial value after the ninth cycle, indicating that N235-impregnated resins could keep a high adsorption capacity after several cycles and it could be used to recover and separate vanadium from solutions.