Adsorption of Iodide from Aqueous Solution Using Bi2O3@PAN Composite Sphere
Bi2O3@PAN composite spheres,which are easy to achieve solid-liquid separation,are synthesized by hydrothermal method and phase transfer method and used to investigate the adsorption performance of iodide in so-lution.The effects of the molar amount ratio of Bi2O3 to PAN,system acidity,and initial concentration of iodine ions on the adsorption are discussed in detail.The results show that the optimal adsorption is achieved when the molar amount ratio of Bi2O3 to PAN is 2∶1.At the solution pH of 7.0,the adsorption reaches equilibrium after 210 min with the maximum experimental adsorption capacity of 122.3 mg/g.This adsorption process can be well fitted with Langmuir model and quasi-second order kinetics.The theoretical adsorption capacity of 135.7 mg/g can be obtained by Langmuir model,while quasi-second order kinetics fits adsorption data indicating that the ad-sorption is mainly a chemical process,and intra particle diffusion will have a significant impact on the adsorption rate.The adsorbed iodine ions can be eluted by using potassium chloride solution,and the adsorption-elution ex-periment results show that Bi2O3@PAN composite spheres have a good reusability.
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维普
