Study on Adsorption of Volatile Iodine by Polypyrrole/polyacrylonitrile Electrospun Fibers
With the development of nuclear power,it is inevitable to produce radioactive waste.Among them,radioactive iodine accounts for the largest proportion in radioactive waste gas,which will pose a threat to environmental safety and biological health,so it is of great significance to remove radioactive iodine.In this paper,Polypyrrole/polyacrylonitrile(PPy/PAN)nanofibers were synthesized by electrospinning process,the physical and chemical properties of the nanofiber materials were characterized by using SEM,TEM,XRD,FT-IR,XPS,Raman technology,and the material was used to investigate the adsorption behaviors of gaseous iodine.The effects of different proportions of electrospinning materials,electrospinning conditions,adsorption time and other conditions on the adsorption behaviors of gaseous iodine were discussed,and the adsorption mechanism was revealed.The results show that the nanofibers spun have the best adsorption effect when m(PPy)∶m(PAN)=1∶4 and the spinning voltage controlled at 18 kv.And the maximum adsorption capacity of the adsorbent for iodine at 348.15 K within 160 min reached 1680.97 mg/g,which is accords with the pseudo-second-order kinetic model.Moreover,the adsorbent can release the adsorbed iodine from ethanol after capturing iodine,and the composite nanofibers has good reusability.This study provides a new idea for the separation and enrichment of volatile radioactive iodine.
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