磁性铁氧化物在含铀废水吸附处理中的应用研究

Research on the Application of Magnetic Iron Oxides in the Adsorption Treatment of Uranium-Containing Wastewater

针对含铀废水高效处理难问题,研究制备了磁性铁氧化物γ-Fe_(2)O_(3)@SiO_(2),分析了溶液pH、投加量、水体中黄腐酸(FA)和共存离子对γ-Fe_(2)O_(3)@SiO_(2)的U(VI)吸附性能的影响。结果表明,弱酸条件下γ-Fe_(2)O_(3)@SiO_(2)对U(VI)的去除效果较好,当pH=6时,U(VI)的去除率接近100%,γ-Fe_(2)O_(3)@SiO_(2)的较优投加量为0.4 g/L;FA对γ-Fe_(2)O_(3)@SiO_(2)的U(VI)吸附具有一定的抑制作用,且强酸环境下的抑制效果更明显;阳离子的存在对γ-Fe_(2)O_(3)@SiO_(2)吸附U(VI)的影响较小,而重金属阳离子对吸附铀的抑制作用更强。该研究对含铀废水的吸附处理具有一定的指导意义。

In response to the difficulty of efficient treatment of uranium-containing wastewater,magnetic iron oxides were studied and preparedγ-Fe_(2)O_(3)@SiO_(2).The effects of solution pH,dosage,humic acid(FA)in water and coexisting ions on U(VI)adsorption ofγ-Fe_(2)O_(3)@SiO_(2) were analyzed.The results show that the U(VI)removal efficiency ofγ-Fe_(2)O_(3)@SiO_(2) is better under weak acid condition.When pH=6,the U(VI)removal rate is close to 100%,and the optimal dosage ofγ-Fe_(2)O_(3)@SiO_(2) is 0.4 g/L.FA can inhibit the U(VI)adsorption ofγ-Fe_(2)O_(3)@SiO_(2),and the inhibitory effect is more obvious in strong acid environment.The presence of cations has little effect on the adsorption of U(VI)byγ-Fe_(2)O_(3)@SiO_(2),while the heavy metal cations have stronger inhibition on the adsorption of uranium.This study has certain guiding significance for the adsorption treatment of uranium-containing wastewater.