氧化铋@壳聚糖/β-环糊精复合气凝胶珠的制备及对碘的吸附性能研究OA

Radioactive Iodine isotopes(such as 131I and 129I)is a common radioactive contaminant in water bod-ies,characterized by its long half-life,high biological toxicity,and environmental mobility.To eliminate their en-vironmental risks,the development of efficient and environmentally friendly adsorption materials has become the research focus.Bismuth oxide exhibits superior performance in Iodine adsorption due to its distinctive struc-tural and surface chemical properties.In order to improve the adsorption capacity of bismuth oxide,a composite adsorbent Bi2O3@CS/β-CD was prepared by incorporating Bi2O3 into a β-cyclodextrin/chitosan aerogel.The ex-perimental adsorption capacity of Bi2O3@CS/β-CD for Iodine was 860 mg/g,and it fitted well with the Freun-dlich adsorption isotherm model.The adsorption kinetics followed the pseudo-second-order model,indicating chemisorption.When the mass fraction of bismuth oxide was 5%,the adsorption efficiency increased by 200%.After four sorption-desorption cycles,the adsorbent still retained high Iodine adsorption performance.Mechanis-tic studies revealed that this enhanced adsorption capacity is primarily attributed to the high electropositivity of bismuth oxide and its ability to form stable complexes with iodine.