二乙烯三胺五甲叉膦酸锆对铀吸附性能的研究

采用二乙烯三胺五甲叉膦酸(DTPMP)为有机膦源,以氧氯化锆(ZrOCl₂·8H₂O)为无机锆源,使用水热法制备了二乙烯三胺五甲叉膦酸锆有机杂化材料(Zr-DTPMP)。其后通过红外光谱、扫描电镜和X射线能谱等手段对不同膦锆配比下合成的有机-无机杂化材料进行了表征,同时将铀(Ⅵ)溶液初始pH、接触时间、铀初始浓度、温度和吸附剂投加量等作为影响因素对有机膦酸锆(Zr-DTPMP)对吸附铀(Ⅵ)性能的影响做出静态吸附法研究。结果表明:Zr-DTPMP的红外谱图中出现了P—O—Zr和C—P的伸缩振动,表明成功制备了有机杂化材料,且扫描电镜结果显示其表面具有丰富的孔结构。吸附后Zr-DTPMP的能谱图中出现了铀的能量散射峰,证实了Zr-DTPMP可去除水溶液中的铀(Ⅵ);在吸附实验中,Zr-DTPMP吸附铀(Ⅵ)的最佳条件为膦锆比为5∶1,pH=4.0,吸附平衡时间为360min,铀初始浓度为50mg/L,温度为298K,投加量为0.01g。

Adsorption of U(Ⅵ)on diethylenetriamine pentamethylene phosphate zirconium

Using diethylenetriamine pentamethylene phosphonic acid(DTPMP)as the organic phosphine source,and zirconium oxychloride(ZrOCl₂·8 H₂O)as the inorganic zirconium source,diethylenetriamine pentamethylene phosphate zirconium(Zr-DTPMP)was prepared by hydrothermal method.Afterwards,the organicinorganic hybrid materials synthesized under different ratios of phosphorus and zirconium were characterized by FT-IR,SEM&EDS,and the initial pH value,contact time,initial concentration of uranium(Ⅵ),temperature and the dosage of adsorbent were used as an influencing factor to study the effect of Zr-DTPMP on the performance of U(Ⅵ)adsorption by static adsorption method.The results showed that P—O—Zr and C—P stretching vibrations appeared in the FT-IR of Zr-DTPMP,indicating that the organic hybrid material was successfully prepared,and the SEM image showed that the surface had abundant pore structure.After adsorption,the energy scattering peak of U(Ⅵ)appeared in the EDS spectrum of Zr-DTPMP,confirming that Zr-DTPMP can remove U(Ⅵ)in the aqueous solution.The best conditions for Zr-DTPMP to adsorb U(Ⅵ)were The ratio of phosphine to zirconium was 5∶1,pH=4.0,adsorption equilibrium time360 min,initial uranium concentration 50 mg/L,temperature 298 K,and dosage 0.01 g.