玉米淀粉负载型纳米零价铁去除溶液中U(Ⅵ)研究

Study on Removal of U(Ⅵ)from Aqueous Solution by Cornstarch-loaded Nanoscale Zero-valent Iron

通过液相还原法制备玉米淀粉负载型纳米零价铁(CS-NZVI),利用SEM和XRD对材料进行了表征,并且探究了不同溶液pH、U(Ⅵ)初始浓度、CS-NZVI浓度、温度、反应时间对U(Ⅵ)去除效果的影响。结果表明,CS-NZVI整体分散性较好,相较于NZVI团聚情况明显改善。在溶液pH=6.0、U(Ⅵ)初始浓度10.0mg/L、CS-NZVI浓度0.4g/L、温度30℃、反应时间140min时,CS-NZVI材料对溶液中U(Ⅵ)的去除率为95.05%,去除量为24.86mg/g。

Cornstarch-loaded nanometer zero-valent iron(CS-NZVI)was prepared by liquid phase reduction method.CS-NZVI was characterized by SEM and XRD.Effects of pH value of solution,initial concentrations of U(Ⅵ),CS-NZVI concentration,temperature,and contact time on removal of U(Ⅵ)were investigated.The results show that dispersion of CS-NZVI is better than that of NZVI.Removal rate and adsorption capacity of U(Ⅵ)is 95.05%and 24.86 mg/g respectively under the optimum conditions including pH value of solution of 6.0,initial concentration of U(Ⅵ)of 10.0 mg/L,CS-NZVI concentration of 0.4 g/L,temperature of 30℃,and contact time of 140 min.CS-NZVI has an excellent adsorption effect on U(Ⅵ).