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聚丙烯腈-钛硅酸钠球形复合吸附剂对Cs+的吸附性能研究

Research on Adsorption Property of Cs+ on PAN-NaTS Spherical Composite Adsorbent

    摘要
  • 摘要: 通过静态吸附实验，研究了接触时间、溶液pH值、共存离子、Cs+初始浓度等对聚丙烯腈-钛硅酸钠（PAN-NaTS）吸附Cs+性能的影响，从动力学、吸附机理和热力学方面对吸附过程进行了分析，并用扫描电子显微镜(SEM)、傅里叶红外光谱(FT-IR)和X射线衍射(XRD)对吸附剂进行了表征。结果表明：PAN-NaTS对Cs+的吸附平衡时间约为20 h；最佳pH值为3.90~10.87；溶液中含K+、Na+、NH+4、Ca2+或Mg2+时会抑制PAN-NaTS对Cs+的吸附。PAN-NaTS对Cs+的吸附动力学数据符合准一级动力学方程，且颗粒内扩散和膜扩散共同控制吸附速率，颗粒内扩散是决定吸附速率的关键。PAN-NaTS对Cs+的吸附符合Langmuir等温吸附模型，吸附过程为单分子层吸附；PAN-NaTS对Cs+的饱和吸附容量可达219-298 mg/g。

     

    Abstract: The effects of contact time, pH, co-existing ions and initial Cs+ concentration on the adsorption property of Cs+ on polyacrylonitrile-sodium titanosilicate (PAN-NaTS) were studied by static experiments. The adsorption process was analyzed by thermodynamics, adsorption mechanism and kinetics, and the PAN-NaTS was characterized and analyzed by SEM, FT-IR and XRD. The results show that the adsorption process of Cs+ on PAN-NaTS reaches equilibrium after about 20 h, the optimized pH value of solution is in the range of 3.90-10.87, and the existence of K+, Na+, NH+4, Ca2+ or Mg2+ has inhibiting effects on the adsorption. The adsorption process of PAN-NaTS mainly fits the pseudo-first-order equation. In addition, intraparticle diffusion and film diffusion control the rate of adsorption simultaneously, and the intraparticle diffusion is the main rate-controlling step. The adsorption of Cs+ on PAN-NaTS follows Langmuir model and is monolayer adsorption. The saturated adsorption capacity of Cs+ on PAN-NaTS is up to 219-298 mg/g.

     

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